Refactored Dropbox, WebDAV & OneDrive to HTTPFileProvider

- FileOperationType.source is not optional anymore - critical bugfix: KVO exception crash on task completion
Merge pull request #60 from evilutioner/master
2017-08-19 05:51:25 +04:30 · 2017-08-15 18:53:21 +04:30 · 2017-08-15 18:41:48 +04:30 · 2017-08-15 16:57:50 +03:00 · 2017-08-15 15:08:06 +04:30 · 2017-08-15 14:57:36 +04:30
29 changed files with 2610 additions and 2165 deletions
@@ -12,8 +12,8 @@ env:
  - MACOS_SDK=macosx
  - TVOS_SDK=appletvsimulator
  matrix:
-    - DESTINATION="OS=10.2,name=iPad Air 2"        SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="NO" BUILD_EXAMPLE="NO" POD="YES" CARTHAGEDEPLOY="NO"
-    - DESTINATION="OS=9.0,name=iPhone 6"           SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="NO" BUILD_EXAMPLE="NO" POD="NO"  CARTHAGEDEPLOY="YES"
+    - DESTINATION="OS=10.2,name=iPad Air 2"        SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="NO" BUILD_EXAMPLE="NO" POD="NO" CARTHAGEDEPLOY="YES"
+    - DESTINATION="OS=9.0,name=iPhone 6"           SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="NO" BUILD_EXAMPLE="NO" POD="YES"  CARTHAGEDEPLOY="NO"
    - DESTINATION="OS=8.1,name=iPhone 4S"          SCHEME="$IOS_FRAMEWORK_SCHEME"     SDK="$IOS_SDK"     RUN_TESTS="NO" BUILD_EXAMPLE="NO" POD="NO"  CARTHAGEDEPLOY="NO"

    - DESTINATION="OS=10.1,name=Apple TV 1080p"    SCHEME="$TVOS_FRAMEWORK_SCHEME"    SDK="$TVOS_SDK"    RUN_TESTS="NO" BUILD_EXAMPLE="NO" POD="NO"  CARTHAGEDEPLOY="NO"
@@ -56,7 +56,7 @@ script:
 after_success:
  # Run `pod trunk push` if specified
  - if [ $POD == "YES" ] && [ -n "$TRAVIS_TAG" ]; then
-      pod trunk push;
+      pod trunk push --allow-warnings;
    fi

 #   - bash <(curl -s https://codecov.io/bash)
@@ -75,6 +75,7 @@ deploy:
  file: $FRAMEWORK_NAME.zip
  skip_cleanup: true
  on:
-    repo: amosavian/$PROJECTNAME
+    # repo: amosavian/$PROJECTNAME
+    repo: amosavian/FileProvider
    tags: true
    condition: "$CARTHAGEDEPLOY = YES"
@@ -1,5 +1,5 @@
 #
-#  Be sure to run `pod spec lint FileProvider.podspec' to ensure this is a
+#  Be sure to run `pod spec lint FilesProvider.podspec' to ensure this is a
 #  valid spec and to remove all comments including this before submitting the spec.
 #
 #  To learn more about Podspec attributes see http://docs.cocoapods.org/specification.html
@@ -15,8 +15,8 @@ Pod::Spec.new do |s|
  #  summary should be tweet-length, and the description more in depth.
  #

-  s.name         = "FileProvider"
-  s.version      = "0.15.2"
+  s.name         = "FilesProvider"
+  s.version      = "0.20.0"
  s.summary      = "FileManager replacement for Local and Remote (WebDAV/FTP/Dropbox/OneDrive/SMB2) files on iOS and macOS."

  # This description is used to generate tags and improve search results.
@@ -58,7 +58,7 @@ Pod::Spec.new do |s|
  s.author             = { "Amir Abbas Mousavian" => "a.mosavian@gmail.com" }
  # Or just: s.author    = "Amir Abbas Mousavian"
  # s.authors            = { "Amir Abbas Mousavian" => "a.mosavian@gmail.com" }
-  s.social_media_url   = "https://twitter.com/amosavian"
+  # s.social_media_url   = "https://twitter.com/amosavian"

  # ――― Platform Specifics ――――――――――――――――――――――――――――――――――――――――――――――――――――――― #
  #
@@ -50,6 +50,9 @@
 		794C220E1D591A4B00EC49B8 /* SMB2QueryTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 794C220D1D591A4B00EC49B8 /* SMB2QueryTypes.swift */; };
 		794C220F1D591A4B00EC49B8 /* SMB2QueryTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 794C220D1D591A4B00EC49B8 /* SMB2QueryTypes.swift */; };
 		794C22101D591A4B00EC49B8 /* SMB2QueryTypes.swift in Sources */ = {isa = PBXBuildFile; fileRef = 794C220D1D591A4B00EC49B8 /* SMB2QueryTypes.swift */; };
+		7958155A1F478ED9003344DD /* HTTPFileProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 795815591F478ED9003344DD /* HTTPFileProvider.swift */; };
+		7958155B1F478ED9003344DD /* HTTPFileProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 795815591F478ED9003344DD /* HTTPFileProvider.swift */; };
+		7958155C1F478ED9003344DD /* HTTPFileProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 795815591F478ED9003344DD /* HTTPFileProvider.swift */; };
 		796807551E7BF17E00BBB87B /* FileProviderExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 796807541E7BF17E00BBB87B /* FileProviderExtensions.swift */; };
 		796807561E7BF17E00BBB87B /* FileProviderExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 796807541E7BF17E00BBB87B /* FileProviderExtensions.swift */; };
 		796807571E7BF17E00BBB87B /* FileProviderExtensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 796807541E7BF17E00BBB87B /* FileProviderExtensions.swift */; };
@@ -116,9 +119,9 @@
 		79BD63BE1E2CC3C20035128C /* ImageIO.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 79BD63BD1E2CC3C20035128C /* ImageIO.framework */; };
 		79BD63C01E2CC3CD0035128C /* CoreGraphics.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 79BD63BF1E2CC3CD0035128C /* CoreGraphics.framework */; };
 		79BD63C21E2CC3D30035128C /* AVFoundation.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 79BD63C11E2CC3D30035128C /* AVFoundation.framework */; };
-		79BD63C51E2D17880035128C /* OneDriveFileProvide.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C31E2D17880035128C /* OneDriveFileProvide.swift */; };
-		79BD63C61E2D17880035128C /* OneDriveFileProvide.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C31E2D17880035128C /* OneDriveFileProvide.swift */; };
-		79BD63C71E2D17880035128C /* OneDriveFileProvide.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C31E2D17880035128C /* OneDriveFileProvide.swift */; };
+		79BD63C51E2D17880035128C /* OneDriveFileProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C31E2D17880035128C /* OneDriveFileProvider.swift */; };
+		79BD63C61E2D17880035128C /* OneDriveFileProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C31E2D17880035128C /* OneDriveFileProvider.swift */; };
+		79BD63C71E2D17880035128C /* OneDriveFileProvider.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C31E2D17880035128C /* OneDriveFileProvider.swift */; };
 		79BD63C81E2D17880035128C /* OneDriveHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C41E2D17880035128C /* OneDriveHelper.swift */; };
 		79BD63C91E2D17880035128C /* OneDriveHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C41E2D17880035128C /* OneDriveHelper.swift */; };
 		79BD63CA1E2D17880035128C /* OneDriveHelper.swift in Sources */ = {isa = PBXBuildFile; fileRef = 79BD63C41E2D17880035128C /* OneDriveHelper.swift */; };
@@ -144,11 +147,12 @@
 		794C21FD1D58912A00EC49B8 /* DropboxHelper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = DropboxHelper.swift; sourceTree = "<group>"; };
 		794C22091D5893F800EC49B8 /* SMB2Notification.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SMB2Notification.swift; sourceTree = "<group>"; };
 		794C220D1D591A4B00EC49B8 /* SMB2QueryTypes.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = SMB2QueryTypes.swift; sourceTree = "<group>"; };
+		795815591F478ED9003344DD /* HTTPFileProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = HTTPFileProvider.swift; sourceTree = "<group>"; };
 		796807541E7BF17E00BBB87B /* FileProviderExtensions.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FileProviderExtensions.swift; sourceTree = "<group>"; };
 		798654321E8874BC002FA550 /* FTPHelper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FTPHelper.swift; sourceTree = "<group>"; };
-		799396671D48B7F600086753 /* FileProvider.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FileProvider.framework; sourceTree = BUILT_PRODUCTS_DIR; };
-		799396751D48B80D00086753 /* FileProvider.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FileProvider.framework; sourceTree = BUILT_PRODUCTS_DIR; };
-		799396821D48B82700086753 /* FileProvider.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FileProvider.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		799396671D48B7F600086753 /* FilesProvider.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FilesProvider.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		799396751D48B80D00086753 /* FilesProvider.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FilesProvider.framework; sourceTree = BUILT_PRODUCTS_DIR; };
+		799396821D48B82700086753 /* FilesProvider.framework */ = {isa = PBXFileReference; explicitFileType = wrapper.framework; includeInIndex = 0; path = FilesProvider.framework; sourceTree = BUILT_PRODUCTS_DIR; };
 		7993968B1D48B8C700086753 /* Info-iOS.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "Info-iOS.plist"; sourceTree = "<group>"; };
 		7993968C1D48B8C700086753 /* Info-MacOS.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "Info-MacOS.plist"; sourceTree = "<group>"; };
 		7993968D1D48B8C700086753 /* Info-tvOS.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist.xml; path = "Info-tvOS.plist"; sourceTree = "<group>"; };
@@ -182,7 +186,7 @@
 		79BD63BD1E2CC3C20035128C /* ImageIO.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = ImageIO.framework; path = Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS10.1.sdk/System/Library/Frameworks/ImageIO.framework; sourceTree = DEVELOPER_DIR; };
 		79BD63BF1E2CC3CD0035128C /* CoreGraphics.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = CoreGraphics.framework; path = Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS10.1.sdk/System/Library/Frameworks/CoreGraphics.framework; sourceTree = DEVELOPER_DIR; };
 		79BD63C11E2CC3D30035128C /* AVFoundation.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = AVFoundation.framework; path = Platforms/AppleTVOS.platform/Developer/SDKs/AppleTVOS10.1.sdk/System/Library/Frameworks/AVFoundation.framework; sourceTree = DEVELOPER_DIR; };
-		79BD63C31E2D17880035128C /* OneDriveFileProvide.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OneDriveFileProvide.swift; sourceTree = "<group>"; };
+		79BD63C31E2D17880035128C /* OneDriveFileProvider.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OneDriveFileProvider.swift; sourceTree = "<group>"; };
 		79BD63C41E2D17880035128C /* OneDriveHelper.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = OneDriveHelper.swift; sourceTree = "<group>"; };
 		79F5745A1DFDB10A00179ABF /* FileObject.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = FileObject.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
@@ -269,9 +273,9 @@
 		799396681D48B7F600086753 /* Products */ = {
 			isa = PBXGroup;
 			children = (
-				799396671D48B7F600086753 /* FileProvider.framework */,
-				799396751D48B80D00086753 /* FileProvider.framework */,
-				799396821D48B82700086753 /* FileProvider.framework */,
+				799396671D48B7F600086753 /* FilesProvider.framework */,
+				799396751D48B80D00086753 /* FilesProvider.framework */,
+				799396821D48B82700086753 /* FilesProvider.framework */,
 			);
 			name = Products;
 			sourceTree = "<group>";
@@ -299,17 +303,18 @@
 				792572401DF23BDA006A1526 /* LocalHelper.swift */,
 				79480FF51E3ABDD0007E7275 /* CloudFileProvider.swift */,
 				79BD638B1E2CC2300035128C /* ExtendedLocalFileProvider.swift */,
+				7924B1A81D89F79200589DB7 /* FPSStreamTask.swift */,
 				7902C0851D61B56D00564440 /* RemoteSession.swift */,
+				795815591F478ED9003344DD /* HTTPFileProvider.swift */,
 				799396931D48C02300086753 /* DropboxFileProvider.swift */,
 				794C21FD1D58912A00EC49B8 /* DropboxHelper.swift */,
+				79BD63C31E2D17880035128C /* OneDriveFileProvider.swift */,
+				79BD63C41E2D17880035128C /* OneDriveHelper.swift */,
+				799396A61D48C02300086753 /* WebDAVFileProvider.swift */,
 				7936BC111E880F5700A6C81C /* FTPFileProvider.swift */,
 				798654321E8874BC002FA550 /* FTPHelper.swift */,
-				79BD63C31E2D17880035128C /* OneDriveFileProvide.swift */,
-				79BD63C41E2D17880035128C /* OneDriveHelper.swift */,
-				7924B1A81D89F79200589DB7 /* FPSStreamTask.swift */,
 				799396971D48C02300086753 /* SMBClient.swift */,
 				799396981D48C02300086753 /* SMBFileProvider.swift */,
-				799396A61D48C02300086753 /* WebDAVFileProvider.swift */,
 			);
 			path = Sources;
 			sourceTree = "<group>";
@@ -368,9 +373,9 @@
 /* End PBXHeadersBuildPhase section */

 /* Begin PBXNativeTarget section */
-		799396661D48B7F600086753 /* FileProvider iOS */ = {
+		799396661D48B7F600086753 /* FilesProvider iOS */ = {
 			isa = PBXNativeTarget;
-			buildConfigurationList = 7993966F1D48B7F600086753 /* Build configuration list for PBXNativeTarget "FileProvider iOS" */;
+			buildConfigurationList = 7993966F1D48B7F600086753 /* Build configuration list for PBXNativeTarget "FilesProvider iOS" */;
 			buildPhases = (
 				799396621D48B7F600086753 /* Sources */,
 				799396631D48B7F600086753 /* Frameworks */,
@@ -381,14 +386,14 @@
 			);
 			dependencies = (
 			);
-			name = "FileProvider iOS";
+			name = "FilesProvider iOS";
 			productName = "FileProvider iOS";
-			productReference = 799396671D48B7F600086753 /* FileProvider.framework */;
+			productReference = 799396671D48B7F600086753 /* FilesProvider.framework */;
 			productType = "com.apple.product-type.framework";
 		};
-		799396741D48B80D00086753 /* FileProvider OSX */ = {
+		799396741D48B80D00086753 /* FilesProvider OSX */ = {
 			isa = PBXNativeTarget;
-			buildConfigurationList = 7993967A1D48B80D00086753 /* Build configuration list for PBXNativeTarget "FileProvider OSX" */;
+			buildConfigurationList = 7993967A1D48B80D00086753 /* Build configuration list for PBXNativeTarget "FilesProvider OSX" */;
 			buildPhases = (
 				799396701D48B80D00086753 /* Sources */,
 				799396711D48B80D00086753 /* Frameworks */,
@@ -399,14 +404,14 @@
 			);
 			dependencies = (
 			);
-			name = "FileProvider OSX";
+			name = "FilesProvider OSX";
 			productName = "FileProvider OSX";
-			productReference = 799396751D48B80D00086753 /* FileProvider.framework */;
+			productReference = 799396751D48B80D00086753 /* FilesProvider.framework */;
 			productType = "com.apple.product-type.framework";
 		};
-		799396811D48B82700086753 /* FileProvider tvOS */ = {
+		799396811D48B82700086753 /* FilesProvider tvOS */ = {
 			isa = PBXNativeTarget;
-			buildConfigurationList = 799396871D48B82700086753 /* Build configuration list for PBXNativeTarget "FileProvider tvOS" */;
+			buildConfigurationList = 799396871D48B82700086753 /* Build configuration list for PBXNativeTarget "FilesProvider tvOS" */;
 			buildPhases = (
 				7993967D1D48B82700086753 /* Sources */,
 				7993967E1D48B82700086753 /* Frameworks */,
@@ -417,9 +422,9 @@
 			);
 			dependencies = (
 			);
-			name = "FileProvider tvOS";
+			name = "FilesProvider tvOS";
 			productName = "FileProvider tvOS";
-			productReference = 799396821D48B82700086753 /* FileProvider.framework */;
+			productReference = 799396821D48B82700086753 /* FilesProvider.framework */;
 			productType = "com.apple.product-type.framework";
 		};
 /* End PBXNativeTarget section */
@@ -442,7 +447,7 @@
 					};
 				};
 			};
-			buildConfigurationList = 7993965F1D48B7BF00086753 /* Build configuration list for PBXProject "FileProvider" */;
+			buildConfigurationList = 7993965F1D48B7BF00086753 /* Build configuration list for PBXProject "FilesProvider" */;
 			compatibilityVersion = "Xcode 3.2";
 			developmentRegion = English;
 			hasScannedForEncodings = 0;
@@ -454,9 +459,9 @@
 			projectDirPath = "";
 			projectRoot = "";
 			targets = (
-				799396661D48B7F600086753 /* FileProvider iOS */,
-				799396741D48B80D00086753 /* FileProvider OSX */,
-				799396811D48B82700086753 /* FileProvider tvOS */,
+				799396661D48B7F600086753 /* FilesProvider iOS */,
+				799396741D48B80D00086753 /* FilesProvider OSX */,
+				799396811D48B82700086753 /* FilesProvider tvOS */,
 			);
 		};
 /* End PBXProject section */
@@ -498,10 +503,11 @@
 				7936BC121E880F5700A6C81C /* FTPFileProvider.swift in Sources */,
 				79480FF61E3ABDD0007E7275 /* CloudFileProvider.swift in Sources */,
 				79F5745B1DFDB10B00179ABF /* FileObject.swift in Sources */,
-				79BD63C51E2D17880035128C /* OneDriveFileProvide.swift in Sources */,
+				79BD63C51E2D17880035128C /* OneDriveFileProvider.swift in Sources */,
 				7924B1991D89DAE000589DB7 /* Element.swift in Sources */,
 				799396C81D48C02300086753 /* SMB2IOCtl.swift in Sources */,
 				799396D71D48C02300086753 /* SMB2Types.swift in Sources */,
+				7958155A1F478ED9003344DD /* HTTPFileProvider.swift in Sources */,
 				798654331E8874BC002FA550 /* FTPHelper.swift in Sources */,
 				7924B1B21D89FCDA00589DB7 /* FPSStreamTask.swift in Sources */,
 				799396C51D48C02300086753 /* SMB2FileOperation.swift in Sources */,
@@ -541,10 +547,11 @@
 				7936BC131E880F5700A6C81C /* FTPFileProvider.swift in Sources */,
 				79480FF71E3ABDD0007E7275 /* CloudFileProvider.swift in Sources */,
 				79F5745C1DFDB10B00179ABF /* FileObject.swift in Sources */,
-				79BD63C61E2D17880035128C /* OneDriveFileProvide.swift in Sources */,
+				79BD63C61E2D17880035128C /* OneDriveFileProvider.swift in Sources */,
 				7924B1B01D89F7DE00589DB7 /* FPSStreamTask.swift in Sources */,
 				7924B19A1D89DAE000589DB7 /* Element.swift in Sources */,
 				799396C91D48C02300086753 /* SMB2IOCtl.swift in Sources */,
+				7958155B1F478ED9003344DD /* HTTPFileProvider.swift in Sources */,
 				79F4678B1E8B80F200C91A85 /* FTPHelper.swift in Sources */,
 				799396D81D48C02300086753 /* SMB2Types.swift in Sources */,
 				799396C61D48C02300086753 /* SMB2FileOperation.swift in Sources */,
@@ -584,10 +591,11 @@
 				7936BC141E880F5700A6C81C /* FTPFileProvider.swift in Sources */,
 				79480FF81E3ABDD0007E7275 /* CloudFileProvider.swift in Sources */,
 				79F5745D1DFDB10B00179ABF /* FileObject.swift in Sources */,
-				79BD63C71E2D17880035128C /* OneDriveFileProvide.swift in Sources */,
+				79BD63C71E2D17880035128C /* OneDriveFileProvider.swift in Sources */,
 				7924B1B11D89F7DF00589DB7 /* FPSStreamTask.swift in Sources */,
 				7924B19B1D89DAE000589DB7 /* Element.swift in Sources */,
 				799396CA1D48C02300086753 /* SMB2IOCtl.swift in Sources */,
+				7958155C1F478ED9003344DD /* HTTPFileProvider.swift in Sources */,
 				79F4678C1E8B80F200C91A85 /* FTPHelper.swift in Sources */,
 				799396D91D48C02300086753 /* SMB2Types.swift in Sources */,
 				799396C71D48C02300086753 /* SMB2FileOperation.swift in Sources */,
@@ -621,7 +629,7 @@
 		799396601D48B7BF00086753 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				BUNDLE_VERSION_STRING = 0.15.2;
+				BUNDLE_VERSION_STRING = 0.20.0;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -631,6 +639,7 @@
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
 				CLANG_WARN_UNREACHABLE_CODE = YES;
 				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
 				DEBUG_INFORMATION_FORMAT = dwarf;
 				ENABLE_BITCODE = YES;
 				ENABLE_STRICT_OBJC_MSGSEND = YES;
@@ -644,6 +653,7 @@
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
 				ONLY_ACTIVE_ARCH = YES;
+				PRODUCT_NAME = FilesProvider;
 				SWIFT_VERSION = 3.0;
 			};
 			name = Debug;
@@ -651,7 +661,7 @@
 		799396611D48B7BF00086753 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				BUNDLE_VERSION_STRING = 0.15.2;
+				BUNDLE_VERSION_STRING = 0.20.0;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -671,6 +681,7 @@
 				GCC_WARN_UNINITIALIZED_AUTOS = YES;
 				GCC_WARN_UNUSED_FUNCTION = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
+				PRODUCT_NAME = FilesProvider;
 				SWIFT_OPTIMIZATION_LEVEL = "-Owholemodule";
 				SWIFT_VERSION = 3.0;
 			};
@@ -717,8 +728,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FileProvider-iOS";
-				PRODUCT_NAME = FileProvider;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FilesProvider-iOS";
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -764,8 +774,7 @@
 				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = NO;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FileProvider-iOS";
-				PRODUCT_NAME = FileProvider;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FilesProvider-iOS";
 				SDKROOT = iphoneos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = "1,2";
@@ -821,8 +830,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				MTL_ENABLE_DEBUG_INFO = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FileProvider-OSX";
-				PRODUCT_NAME = FileProvider;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FilesProvider-OSX";
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -872,8 +880,7 @@
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/../Frameworks @loader_path/Frameworks";
 				MACOSX_DEPLOYMENT_TARGET = 10.10;
 				MTL_ENABLE_DEBUG_INFO = NO;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FileProvider-OSX";
-				PRODUCT_NAME = FileProvider;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FilesProvider-OSX";
 				SDKROOT = macosx;
 				SKIP_INSTALL = YES;
 				VERSIONING_SYSTEM = "apple-generic";
@@ -924,8 +931,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = YES;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FileProvider-tvOS";
-				PRODUCT_NAME = FileProvider;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FilesProvider-tvOS";
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
@@ -974,8 +980,7 @@
 				INSTALL_PATH = "$(LOCAL_LIBRARY_DIR)/Frameworks";
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks @loader_path/Frameworks";
 				MTL_ENABLE_DEBUG_INFO = NO;
-				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FileProvider-tvOS";
-				PRODUCT_NAME = FileProvider;
+				PRODUCT_BUNDLE_IDENTIFIER = "com.mousavian.FilesProvider-tvOS";
 				SDKROOT = appletvos;
 				SKIP_INSTALL = YES;
 				TARGETED_DEVICE_FAMILY = 3;
@@ -989,7 +994,7 @@
 /* End XCBuildConfiguration section */

 /* Begin XCConfigurationList section */
-		7993965F1D48B7BF00086753 /* Build configuration list for PBXProject "FileProvider" */ = {
+		7993965F1D48B7BF00086753 /* Build configuration list for PBXProject "FilesProvider" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				799396601D48B7BF00086753 /* Debug */,
@@ -998,7 +1003,7 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		7993966F1D48B7F600086753 /* Build configuration list for PBXNativeTarget "FileProvider iOS" */ = {
+		7993966F1D48B7F600086753 /* Build configuration list for PBXNativeTarget "FilesProvider iOS" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				7993966D1D48B7F600086753 /* Debug */,
@@ -1007,7 +1012,7 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		7993967A1D48B80D00086753 /* Build configuration list for PBXNativeTarget "FileProvider OSX" */ = {
+		7993967A1D48B80D00086753 /* Build configuration list for PBXNativeTarget "FilesProvider OSX" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				7993967B1D48B80D00086753 /* Debug */,
@@ -1016,7 +1021,7 @@
 			defaultConfigurationIsVisible = 0;
 			defaultConfigurationName = Release;
 		};
-		799396871D48B82700086753 /* Build configuration list for PBXNativeTarget "FileProvider tvOS" */ = {
+		799396871D48B82700086753 /* Build configuration list for PBXNativeTarget "FilesProvider tvOS" */ = {
 			isa = XCConfigurationList;
 			buildConfigurations = (
 				799396881D48B82700086753 /* Debug */,
@@ -15,9 +15,9 @@
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "799396741D48B80D00086753"
-               BuildableName = "FileProvider.framework"
-               BlueprintName = "FileProvider OSX"
-               ReferencedContainer = "container:FileProvider.xcodeproj">
+               BuildableName = "FilesProvider.framework"
+               BlueprintName = "FilesProvider OSX"
+               ReferencedContainer = "container:FilesProvider.xcodeproj">
            </BuildableReference>
         </BuildActionEntry>
      </BuildActionEntries>
@@ -26,6 +26,7 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
      </Testables>
@@ -36,6 +37,7 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
@@ -46,9 +48,9 @@
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "799396741D48B80D00086753"
-            BuildableName = "FileProvider.framework"
-            BlueprintName = "FileProvider OSX"
-            ReferencedContainer = "container:FileProvider.xcodeproj">
+            BuildableName = "FilesProvider.framework"
+            BlueprintName = "FilesProvider OSX"
+            ReferencedContainer = "container:FilesProvider.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <AdditionalOptions>
@@ -64,9 +66,9 @@
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "799396741D48B80D00086753"
-            BuildableName = "FileProvider.framework"
-            BlueprintName = "FileProvider OSX"
-            ReferencedContainer = "container:FileProvider.xcodeproj">
+            BuildableName = "FilesProvider.framework"
+            BlueprintName = "FilesProvider OSX"
+            ReferencedContainer = "container:FilesProvider.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
   </ProfileAction>
@@ -15,9 +15,9 @@
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "799396661D48B7F600086753"
-               BuildableName = "FileProvider.framework"
-               BlueprintName = "FileProvider iOS"
-               ReferencedContainer = "container:FileProvider.xcodeproj">
+               BuildableName = "FilesProvider.framework"
+               BlueprintName = "FilesProvider iOS"
+               ReferencedContainer = "container:FilesProvider.xcodeproj">
            </BuildableReference>
         </BuildActionEntry>
      </BuildActionEntries>
@@ -26,6 +26,7 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
      </Testables>
@@ -36,6 +37,7 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
@@ -46,9 +48,9 @@
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "799396661D48B7F600086753"
-            BuildableName = "FileProvider.framework"
-            BlueprintName = "FileProvider iOS"
-            ReferencedContainer = "container:FileProvider.xcodeproj">
+            BuildableName = "FilesProvider.framework"
+            BlueprintName = "FilesProvider iOS"
+            ReferencedContainer = "container:FilesProvider.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <AdditionalOptions>
@@ -64,9 +66,9 @@
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "799396661D48B7F600086753"
-            BuildableName = "FileProvider.framework"
-            BlueprintName = "FileProvider iOS"
-            ReferencedContainer = "container:FileProvider.xcodeproj">
+            BuildableName = "FilesProvider.framework"
+            BlueprintName = "FilesProvider iOS"
+            ReferencedContainer = "container:FilesProvider.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
   </ProfileAction>
@@ -15,9 +15,9 @@
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "799396811D48B82700086753"
-               BuildableName = "FileProvider.framework"
-               BlueprintName = "FileProvider tvOS"
-               ReferencedContainer = "container:FileProvider.xcodeproj">
+               BuildableName = "FilesProvider.framework"
+               BlueprintName = "FilesProvider tvOS"
+               ReferencedContainer = "container:FilesProvider.xcodeproj">
            </BuildableReference>
         </BuildActionEntry>
      </BuildActionEntries>
@@ -26,6 +26,7 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
      shouldUseLaunchSchemeArgsEnv = "YES">
      <Testables>
      </Testables>
@@ -36,6 +37,7 @@
      buildConfiguration = "Debug"
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
+      language = ""
      launchStyle = "0"
      useCustomWorkingDirectory = "NO"
      ignoresPersistentStateOnLaunch = "NO"
@@ -46,9 +48,9 @@
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "799396811D48B82700086753"
-            BuildableName = "FileProvider.framework"
-            BlueprintName = "FileProvider tvOS"
-            ReferencedContainer = "container:FileProvider.xcodeproj">
+            BuildableName = "FilesProvider.framework"
+            BlueprintName = "FilesProvider tvOS"
+            ReferencedContainer = "container:FilesProvider.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
      <AdditionalOptions>
@@ -64,9 +66,9 @@
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "799396811D48B82700086753"
-            BuildableName = "FileProvider.framework"
-            BlueprintName = "FileProvider tvOS"
-            ReferencedContainer = "container:FileProvider.xcodeproj">
+            BuildableName = "FilesProvider.framework"
+            BlueprintName = "FilesProvider tvOS"
+            ReferencedContainer = "container:FilesProvider.xcodeproj">
         </BuildableReference>
      </MacroExpansion>
   </ProfileAction>
@@ -1,5 +1,5 @@
 import PackageDescription

 let package = Package(
-    name: "FileProvider"
-)
+    name: "FilesProvider"
+)
@@ -2,21 +2,28 @@

 >This Swift library provide a swifty way to deal with local and remote files and directories in a unified way.

+<center>
+
 [![Swift Version][swift-image]][swift-url]
 [![Platform][platform-image]](#)
 [![License][license-image]][license-url]
-
-[![Release versin][release-image]][release-url]
-[![CocoaPods version](https://img.shields.io/cocoapods/v/FileProvider.svg)][cocoapods]
-[![Carthage compatible][carthage-image]](https://github.com/Carthage/Carthage)
-
 [![Build Status][travis-image]][travis-url]
 [![Codebeat Badge][codebeat-image]][codebeat-url]
-[![Cocoapods Docs][docs-image]][docs-url]
+
+[![Release version][release-image]][release-url]
+[![CocoaPods version](https://img.shields.io/cocoapods/v/FilesProvider.svg)][cocoapods]
+[![Carthage compatible][carthage-image]](https://github.com/Carthage/Carthage)
 [![Cocoapods Downloads][cocoapods-downloads]][cocoapods]
 [![Cocoapods Apps][cocoapods-apps]][cocoapods]

+Old Cocoapods repo stats:
+[![Cocoapods Downloads][cocoapods-downloads-old]][cocoapods-old]
+[![Cocoapods Apps][cocoapods-apps-old]][cocoapods-old]
+
+</center>
+
 <!--- 
+[![Cocoapods Doc][docs-image]][docs-url]
 [![codecov](https://codecov.io/gh/amosavian/FileProvider/branch/master/graph/badge.svg)](https://codecov.io/gh/amosavian/FileProvider) 
 ---> 

@@ -28,10 +35,8 @@ All functions do async calls and it wont block your main thread.

 - [x] **LocalFileProvider** a wrapper around `FileManager` with some additions like builtin coordinating, searching and reading a portion of file.
 - [x] **CloudFileProvider** A wrapper around app's ubiquitous container API of iCloud Drive.
- [x] **WebDAVFileProvider** WebDAV protocol is defacto file transmission standard, supported by some cloud services like `Box.com` and `Yandex.disk`.
+- [x] **WebDAVFileProvider** WebDAV protocol is defacto file transmission standard, supported by some cloud services like `ownCloud`, `Box.com` and `Yandex.disk`.
 - [x] **FTPFileProvider** While deprecated in 1990s due to serious security concerns, it's still in use on some Web hosts.
-    * Recursive directory removing & searching is not implemented yet.
-    * Active mode is not implemented yet (and probably won`t).
 - [x] **DropboxFileProvider** A wrapper around Dropbox Web API.
    * For now it has limitation in uploading files up to 150MB.
 - [x] **OneDriveFileProvider** A wrapper around OneDrive REST API, works with `onedrive.com` and compatible (business) servers.
@@ -40,7 +45,7 @@ All functions do async calls and it wont block your main thread.
 - [ ] **AmazonS3FileProvider** Amazon storage backend. Used by many sites.
 - [ ] **SMBFileProvider** SMB2/3 introduced in 2006, which is a file and printer sharing protocol originated from Microsoft Windows and now is replacing AFP protocol on macOS.
    * Data types and some basic functions are implemented but *main interface is not implemented yet!*.
-    * SMB1/CIFS is deprecated and very tricky to be implemented due to strict memory allignment in Swift.
+    * SMBv1/CIFS is insecure, deprecated and kinda tricky to be implemented due to strict memory allignment in Swift.

 ## Requirements

@@ -52,12 +57,15 @@ Legacy version is available in swift-2 branch.

 ## Installation

+### Important: this library has been renamed to avoid conflict in iOS 11, macOS 10.13 and Xcode 9.0. Please read issue [#53](https://github.com/amosavian/FileProvider/issues/53) to find more.
+
+
 ### Cocoapods / Carthage / Swift Package Manager

 Add this line to your pods file:

 ```ruby
-pod "FileProvider"
+pod "FilesProvider"
 ```

 Or add this to Cartfile:
@@ -69,7 +77,7 @@ github "amosavian/FileProvider"
 Or to use in Swift Package Manager add this line in `Dependencies`:

 ```swift
-.Package(url: "https://github.com/amosavian/FileProvider.git", majorVersion: 0, minorVersion: 12)
+.Package(url: "https://github.com/amosavian/FileProvider.git", majorVersion: 0)
 ```

 ### Manually
@@ -95,7 +103,7 @@ Then you can do either:

 * Copy Source folder to your project and Voila!

-* Drop `FileProvider.xcodeproj` to you Xcode workspace and add the framework to your Embeded Binaries in target.
+* Drop `FilesProvider.xcodeproj` to you Xcode workspace and add the framework to your Embeded Binaries in target.

 ## Usage

@@ -106,6 +114,8 @@ Each provider has a specific class which conforms to FileProvider protocol and s
 For LocalFileProvider if you want to deal with `Documents` folder

 ```	swift
+import FilesProvider
+
 let documentsProvider = LocalFileProvider()

 // Equals with:
@@ -119,6 +129,8 @@ let documentsProvider = LocalFileProvider(baseURL: documentsURL)
 Also for using group shared container:

 ```swift
+import FilesProvider
+
 let documentsProvider = LocalFileProvider(sharedContainerId: "group.yourcompany.appContainer")
 // Replace your group identifier
 ```
@@ -128,6 +140,8 @@ You can't change the base url later. and all paths are related to this base url
 To initialize an iCloud Container provider look at [here](https://medium.com/ios-os-x-development/icloud-drive-documents-1a46b5706fe1) to see how to update project settings then use below code, This will automatically manager creating Documents folder in container:

 ```swift
+import FilesProvider
+
 let documentsProvider = CloudFileProvider(containerId: nil)
 ```

@@ -135,6 +149,8 @@ let documentsProvider = CloudFileProvider(containerId: nil)
 For remote file providers authentication may be necessary:

 ```	swift
+import FilesProvider
+
 let credential = URLCredential(user: "user", password: "pass", persistence: .permanent)
 let webdavProvider = WebDAVFileProvider(baseURL: URL(string: "http://www.example.com/dav")!, credential: credential)
 ```
@@ -230,10 +246,10 @@ To get list of files in a directory:
 documentsProvider.contentsOfDirectory(path: "/", completionHandler: {
 	contents, error in
 	for file in contents {
-		print("Name: \(attributes.name)")
-		print("Size: \(attributes.size)")
-		print("Creation Date: \(attributes.creationDate)")
-		print("Modification Date: \(attributes.modifiedDate)")
+		print("Name: \(file.name)")
+		print("Size: \(file.size)")
+		print("Creation Date: \(file.creationDate)")
+		print("Modification Date: \(file.modifiedDate)")
 	}
 })
 ```
@@ -250,15 +266,6 @@ func storageProperties(completionHandler: { total, used in
 	
 * if this function is unavailable on provider or an error has been occurred, total space will be reported `-1` and used space `0`

-### Change current directory
-
-```swift
-documentsProvider.currentPath = "/New Folder"
-// now path is ~/Documents/New Folder
-```
-	
-You can then pass "" (empty string) to `contentsOfDirectory` method to list files in current directory.
-
 ### Creating File and Folders

 Creating new directory:
@@ -297,8 +304,6 @@ documentsProvider.moveItem(path: "new folder/old.txt", to: "new.txt", overwrite:
 documentsProvider.removeItem(path: "new.txt", completionHandler: nil)
 ```

-***Caution:*** This method will delete directories with all it's contents recursively except for FTP providers that don't support `SITE RMDIR` command, this will be fixed later.
-
 ### Fetching Contents of File

 There is two method for this purpose, one of them loads entire file into `Data` and another can load a portion of file.
@@ -330,7 +335,7 @@ let data = "What's up Newyork!".data(encoding: .utf8)
 documentsProvider.writeContents(path: "old.txt", content: data, atomically: true, completionHandler: nil)
 ```

-### Copying Files to and From Local URL
+### Copying Files to and From Local Storage

 There are two methods to download and upload files between provider's and local storage. These methods use `URLSessionDownloadTask` and `URLSessionUploadTask` classes and allows to use background session and provide progress via delegate.

@@ -351,6 +356,12 @@ documentsProvider.copyItem(path: "/download/image.jpg", toLocalURL: fileURL, ove
 * It's safe only to assume these methods **won't** handle directories to upload/download recursively. If you need, you can list directories, create directories on target and copy files using these methods.
 * FTP provider allows developer to either use apple implemented `URLSessionDownloadTask` or custom implemented method based on stream task via `useAppleImplementation` property. FTP protocol is not supported by background session.

+### Operation Progress
+
+Creating/Copying/Deleting/Searching functions return a `(NS)Progress`. It provides operation type, progress and a `.cancel()` method which allows you to cancel operation in midst. You can check `cancellable` property to check either you can cancel operation via this object or not.
+
+- **Note:** Progress reporting is not supported by native `(NS)FileManager` so `LocalFileProvider`.
+
 ### Undo Operations

 Providers conform to `FileProviderUndoable` can perform undo for **some** operations like moving/renaming, copying and creating (file or folder). **Now, only `LocalFileProvider` supports this feature.** To implement:
@@ -394,12 +405,6 @@ class ViewController: UIViewController
 }
 ```

-### Operation Handle
-
-Creating/Copying/Deleting functions return a `OperationHandle` for remote operations. It provides operation type, progress and a `.cancel()` method which allows you to cancel operation in midst.
-
-It's not supported by native `(NS)FileManager` so `LocalFileProvider`, but this functionality will be added to future `PosixFileProvider` class.
-
 ### File Coordination

 `LocalFileProvider` and its descendents has a `isCoordinating` property. By setting this, provider will use `NSFileCoordinating` class to do all file operations. It's mandatory for iCloud, while recommended when using shared container or anywhere that simultaneous operations on a file/folder is common.
@@ -431,9 +436,10 @@ To check either file thumbnail is supported or not and fetch thumbnail, use (and

 ```swift
 let path = "/newImage.jpg"
-let thumbSize = CGSize(width: 64, height: 64)
+let thumbSize = CGSize(width: 64, height: 64) // or nil which renders to default dimension of provider
 if documentsProvider.thumbnailOfFileSupported(path: path {
    documentsProvider.thumbnailOfFile(path: file.path, dimension: thumbSize, completionHandler: { (image, error) in
+        // Interacting with UI must be placed in main thread
        DispatchQueue.main.async {
            self.previewImage.image = image
        }
@@ -485,10 +491,11 @@ Distributed under the MIT license. See `LICENSE` for more information.

 [https://github.com/amosavian/](https://github.com/amosavian/)

-[cocoapods]: https://cocoapods.org/pods/FileProvider
+[cocoapods]: https://cocoapods.org/pods/FilesProvider
+[cocoapods-old]: https://cocoapods.org/pods/FileProvider
 [swift-image]: https://img.shields.io/badge/swift-3.0,%203.1-orange.svg
 [swift-url]: https://swift.org/
-[platform-image]: https://img.shields.io/cocoapods/p/FileProvider.svg
+[platform-image]: https://img.shields.io/cocoapods/p/FilesProvider.svg
 [license-image]: https://img.shields.io/github/license/amosavian/FileProvider.svg
 [license-url]: LICENSE
 [codebeat-image]: https://codebeat.co/badges/7b359f48-78eb-4647-ab22-56262a827517
@@ -498,7 +505,9 @@ Distributed under the MIT license. See `LICENSE` for more information.
 [release-url]: https://github.com/amosavian/FileProvider/releases
 [release-image]: https://img.shields.io/github/release/amosavian/FileProvider.svg
 [carthage-image]: https://img.shields.io/badge/Carthage-compatible-4BC51D.svg
-[cocoapods-downloads]: https://img.shields.io/cocoapods/dt/FileProvider.svg
-[cocoapods-apps]: https://img.shields.io/cocoapods/at/FileProvider.svg
-[docs-image]: https://img.shields.io/cocoapods/metrics/doc-percent/FileProvider.svg
-[docs-url]: http://cocoadocs.org/docsets/FileProvider/
+[cocoapods-downloads-old]: https://img.shields.io/cocoapods/dt/FileProvider.svg
+[cocoapods-apps-old]: https://img.shields.io/cocoapods/at/FileProvider.svg
+[cocoapods-downloads]: https://img.shields.io/cocoapods/dt/FilesProvider.svg
+[cocoapods-apps]: https://img.shields.io/cocoapods/at/FilesProvider.svg
+[docs-image]: https://img.shields.io/cocoapods/metrics/doc-percent/FilesProvider.svg
+[docs-url]: http://cocoadocs.org/docsets/FilesProvider/
@@ -15,7 +15,7 @@ import Foundation
 To setup a functional iCloud container, please
 [read this page](https://medium.com/ios-os-x-development/icloud-drive-documents-1a46b5706fe1).
 */
-open class CloudFileProvider: LocalFileProvider {
+open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
    /// An string to identify type of provider.
    open override class var type: String { return "iCloudDrive" }
    
@@ -52,7 +52,7 @@ open class CloudFileProvider: LocalFileProvider {
     - Parameter scope: Use `.documents` (default) to put documents that the user is allowed to access inside a Documents subdirectory. Otherwise use `.data` to store user-related data files that your app needs to share but that are not files you want the user to manipulate directly.
    */
    public init? (containerId: String?, scope: UbiquitousScope = .documents) {
-        assert(!CloudFileProvider.asserting || !Thread.isMainThread, "LocalFileProvider.init(containerId:) is not recommended to be executed on Main Thread.")
+        assert(!(CloudFileProvider.asserting && Thread.isMainThread), "CloudFileProvider.init(containerId:) is not recommended to be executed on Main Thread.")
        guard FileManager.default.ubiquityIdentityToken != nil else {
            return nil
        }
@@ -71,9 +71,14 @@ open class CloudFileProvider: LocalFileProvider {
        super.init(baseURL: baseURL)
        self.isCoorinating = true
        
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: .concurrent)
+        #if swift(>=3.1)
+        let queueLabel = "FileProvider.\(Swift.type(of: self).type)"
+        #else
+        let queueLabel = "FileProvider.\(type(of: self).type)"
+        #endif
+        dispatch_queue = DispatchQueue(label: queueLabel, attributes: .concurrent)
        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
+        operation_queue.name = "\(queueLabel).Operation"
        
        fileManager.url(forUbiquityContainerIdentifier: containerId)
        opFileManager.url(forUbiquityContainerIdentifier: containerId)
@@ -128,7 +133,7 @@ open class CloudFileProvider: LocalFileProvider {
            query.valueListAttributes = [NSMetadataItemURLKey, NSMetadataItemFSNameKey, NSMetadataItemPathKey, NSMetadataItemFSSizeKey, NSMetadataItemContentTypeTreeKey, NSMetadataItemFSCreationDateKey, NSMetadataItemFSContentChangeDateKey]
            query.searchScopes = [self.scope.rawValue]
            var finishObserver: NSObjectProtocol?
-            finishObserver = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
+            finishObserver = NotificationCenter.default.addObserver(forName: .NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
                defer {
                    query.stop()
                    NotificationCenter.default.removeObserver(finishObserver!)
@@ -195,7 +200,7 @@ open class CloudFileProvider: LocalFileProvider {
            query.valueListAttributes = [NSMetadataItemURLKey, NSMetadataItemFSNameKey, NSMetadataItemPathKey, NSMetadataItemFSSizeKey, NSMetadataItemContentTypeTreeKey, NSMetadataItemFSCreationDateKey, NSMetadataItemFSContentChangeDateKey]
            query.searchScopes = [self.scope.rawValue]
            var finishObserver: NSObjectProtocol?
-            finishObserver = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
+            finishObserver = NotificationCenter.default.addObserver(forName: .NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
                defer {
                    query.stop()
                    NotificationCenter.default.removeObserver(finishObserver!)
@@ -238,13 +243,13 @@ open class CloudFileProvider: LocalFileProvider {
     - Note: For now only it's limited to file names. `query` parameter may take `NSPredicate` format in near future.
     
     - Parameters:
-     - path: location of directory to start search
-     - recursive: Searching subdirectories of path
-     - query: Simple string of file name to be search (for now).
-     - foundItemHandler: Closure which is called when a file is found
-     - completionHandler: Closure which will be called after finishing search. Returns an arry of `FileObject` or error if occured.
+         - path: location of directory to start search
+         - recursive: Searching subdirectories of path
+         - query: Simple string of file name to be search (for now).
+         - foundItemHandler: Closure which is called when a file is found
+         - completionHandler: Closure which will be called after finishing search. Returns an arry of `FileObject` or error if occured.
     */
-    open override func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
+    open override func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
        
        let mapDict: [String: String] = ["url": NSMetadataItemURLKey, "name": NSMetadataItemFSNameKey, "path": NSMetadataItemPathKey, "filesize": NSMetadataItemFSSizeKey, "modifiedDate": NSMetadataItemFSContentChangeDateKey, "creationDate": NSMetadataItemFSCreationDateKey, "contentType": NSMetadataItemContentTypeKey]
        
@@ -277,14 +282,21 @@ open class CloudFileProvider: LocalFileProvider {
            }
        }
        
+        let progress = Progress(parent: nil, userInfo: nil)
+        
        dispatch_queue.async {
            let pathURL = self.url(of: path)
+            progress.setUserInfoObject(pathURL, forKey: .fileURLKey)
            let mdquery = NSMetadataQuery()
            mdquery.predicate = NSPredicate(format: "(%K BEGINSWITH %@) && (\(updateQueryKeys(query).predicateFormat))", NSMetadataItemPathKey, pathURL.path)
            mdquery.searchScopes = [self.scope.rawValue]
            
            var lastReportedCount = 0
            
+            progress.cancellationHandler = { [weak mdquery] in
+                mdquery?.stop()
+            }
+            
            if let foundItemHandler = foundItemHandler {
                var updateObserver: NSObjectProtocol?
                
@@ -309,6 +321,7 @@ open class CloudFileProvider: LocalFileProvider {
                        }
                    }
                    lastReportedCount = mdquery.resultCount
+                    progress.totalUnitCount = Int64(lastReportedCount)
                    
                    mdquery.enableUpdates()
                })
@@ -341,12 +354,14 @@ open class CloudFileProvider: LocalFileProvider {
                        contents.append(file)
                    }
                }
+                progress.completedUnitCount = Int64(contents.count)
                self.dispatch_queue.async {
                    completionHandler(contents, nil)
                }
            })
            
            DispatchQueue.main.async {
+                progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
                if !mdquery.start() {
                    self.dispatch_queue.async {
                        completionHandler([], self.throwError(path, code: CocoaError.fileReadNoPermission))
@@ -354,6 +369,8 @@ open class CloudFileProvider: LocalFileProvider {
                }
            }
        }
+        
+        return progress
    }
    
    open override func isReachable(completionHandler: @escaping (Bool) -> Void) {
@@ -370,12 +387,11 @@ open class CloudFileProvider: LocalFileProvider {
       - folder: Directory name.
       - at: Parent path of new directory.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
+     - Returns: A `Progress` object to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
     */
    @discardableResult
-    open override func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard let r = super.create(folder: folderName, at: atPath, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return super.create(folder: folderName, at: atPath, completionHandler: completionHandler)
    }
    
    /**
@@ -388,12 +404,11 @@ open class CloudFileProvider: LocalFileProvider {
       - to: destination path of file or directory, including file/directory name.
       - overwrite: Destination file should be overwritten if file is already exists. **Default** is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
+     - Returns: A `Progress` object to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
     */
    @discardableResult
-    open override func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard let r = super.moveItem(path: path, to: toPath, overwrite: overwrite, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return super.moveItem(path: path, to: toPath, overwrite: overwrite, completionHandler: completionHandler)
    }
    
    /**
@@ -406,12 +421,11 @@ open class CloudFileProvider: LocalFileProvider {
       - to: destination path of file or directory, including file/directory name.
       - overwrite: Destination file should be overwritten if file is already exists. **Default** is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
+     - Returns: A `Progress` object to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
     */
    @discardableResult
-    open override func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard let r = super.copyItem(path: path, to: toPath, overwrite: overwrite, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return super.copyItem(path: path, to: toPath, overwrite: overwrite, completionHandler: completionHandler)
    }
    
    /**
@@ -424,13 +438,11 @@ open class CloudFileProvider: LocalFileProvider {
     - Parameters:
       - path: file or directory path.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
-     
+     - Returns: A `Progress` object to get progress or cancel progress. Doesn't work on `CloudFileProvider`.
     */
    @discardableResult
-    open override func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard let r = super.removeItem(path: path, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return super.removeItem(path: path, completionHandler: completionHandler)
    }
    
    /**
@@ -442,12 +454,19 @@ open class CloudFileProvider: LocalFileProvider {
       - to: destination path of file, including file/directory name.
       - overwrite: Destination file should be overwritten if file is already exists. **Default** is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress.
+     - Returns: A `Progress` object to get progress or cancel progress.
     */
    @discardableResult
-    open override func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open override func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        // TODO: Make use of overwrite parameter
        let opType = FileOperationType.copy(source: localFile.absoluteString, destination: toPath)
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.isCancellable = false
+        progress.setUserInfoObject(localFile, forKey: .fileURLKey)
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: toPath, opType: opType, progress: progress)
        operation_queue.addOperation {
            let tempFolder: URL
            if #available(iOS 10.0, macOS 10.12, tvOS 10.0, *) {
@@ -475,7 +494,7 @@ open class CloudFileProvider: LocalFileProvider {
                })
            }
        }
-        return CloudOperationHandle(operationType: opType, baseURL: self.baseURL)
+        return progress
    }
    
    /**
@@ -486,12 +505,18 @@ open class CloudFileProvider: LocalFileProvider {
       - path: original file or directory path.
       - toLocalURL: destination local url of file, including file/directory name.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress.
+     - Returns: A `Progress` object to get progress or cancel progress.
     */
    @discardableResult
-    open override func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open override func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.copy(source: path, destination: toLocalURL.absoluteString)
-        
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.isCancellable = false
+        progress.setUserInfoObject(self.url(of: path), forKey: .fileURLKey)
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: path, opType: opType, progress: progress)
        do {
            try self.opFileManager.startDownloadingUbiquitousItem(at: self.url(of: path))
        } catch let e {
@@ -501,9 +526,8 @@ open class CloudFileProvider: LocalFileProvider {
            })
            return nil
        }
-        
-        guard let r = super.copyItem(path: path, toLocalURL: toLocalURL, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+        let _ = super.copyItem(path: path, toLocalURL: toLocalURL, completionHandler: completionHandler)
+        return progress
    }
    
    /**
@@ -515,12 +539,19 @@ open class CloudFileProvider: LocalFileProvider {
       - completionHandler: a closure with result of file contents or error.
         `contents`: contents of file in a `Data` object.
         `error`: Error returned by system.
-     - Returns: An `OperationHandle` to get progress or cancel progress.
+     - Returns: A `Progress` object to get progress or cancel progress.
     */
    @discardableResult
-    open override func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
-        guard let r = super.contents(path: path, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
+        let operation = FileOperationType.fetch(path: path)
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(operation, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(self.url(of: path), forKey: .fileURLKey)
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: path, opType: operation, progress: progress)
+        _ = super.contents(path: path, completionHandler: completionHandler)
+        return progress
    }
    
    /**
@@ -534,12 +565,19 @@ open class CloudFileProvider: LocalFileProvider {
       - completionHandler: a closure with result of file contents or error.
         `contents`: contents of file in a `Data` object.
         `error`: Error returned by system.
-     - Returns: An `OperationHandle` to get progress or cancel progress.
+     - Returns: A `Progress` object to get progress or cancel progress.
     */
    @discardableResult
-    open override func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
-        guard let r = super.contents(path: path, offset: offset, length: length, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
+        let operation = FileOperationType.fetch(path: path)
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(operation, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(self.url(of: path), forKey: .fileURLKey)
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: path, opType: operation, progress: progress)
+        _ = super.contents(path: path, offset: offset, length: length, completionHandler: completionHandler)
+        return progress
    }
    
    /**
@@ -551,12 +589,19 @@ open class CloudFileProvider: LocalFileProvider {
       - overwrite: Destination file should be overwritten if file is already exists. Default is `false`.
       - atomically: data will be written to a temporary file before writing to final location. Default is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: A `Progress` object to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    open override func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard let r = super.writeContents(path: path, contents: data, atomically: atomically, overwrite: overwrite, completionHandler: completionHandler) else { return nil }
-        return CloudOperationHandle(operationType: r.operationType, baseURL: self.baseURL)
+    open override func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let operation = FileOperationType.fetch(path: path)
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(operation, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(self.url(of: path), forKey: .fileURLKey)
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: path, opType: operation, progress: progress)
+        _ = super.writeContents(path: path, contents: data, atomically: atomically, overwrite: overwrite, completionHandler: completionHandler)
+        return progress
    }
    
    fileprivate var monitors = [String: (NSMetadataQuery, NSObjectProtocol)]()
@@ -628,7 +673,7 @@ open class CloudFileProvider: LocalFileProvider {
        
        let path = self.relativePathOf(url: url)
        let rpath = path.hasPrefix("/") ? path.substring(from: path.index(after: path.startIndex)) : path
-        let relativeUrl = URL(string: rpath, relativeTo: self.baseURL)
+        let relativeUrl = URL(string: rpath.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? rpath, relativeTo: self.baseURL)
        let file = FileObject(url: relativeUrl ?? url, name: name, path: path)
        
        file.size = (attribs[NSMetadataItemFSSizeKey] as? NSNumber)?.int64Value ?? -1
@@ -641,33 +686,57 @@ open class CloudFileProvider: LocalFileProvider {
        return file
    }
    
-    /// Removes local copy of file, but spares cloud copy/
-    /// - Parameter path: Path of file or directory to be remoed from local
-    /// - Parameter completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-    open func evictItem(path: String, completionHandler: SimpleCompletionHandler) {
-        operation_queue.addOperation {
-            do {
-                try self.opFileManager.evictUbiquitousItem(at: self.url(of: path))
-                completionHandler?(nil)
-            } catch let e {
-                completionHandler?(e)
+    fileprivate func monitorFile(path: String, opType: FileOperationType, progress: Progress?) {
+        dispatch_queue.async {
+            let pathURL = self.url(of: path)
+            let size = pathURL.fileSize
+            progress?.totalUnitCount = size > 0 ? size : 0
+            let query = NSMetadataQuery()
+            query.predicate = NSPredicate(format: "%K LIKE %@", NSMetadataItemPathKey, pathURL.path)
+            query.valueListAttributes = [NSMetadataItemURLKey, NSMetadataItemFSNameKey, NSMetadataItemPathKey, NSMetadataUbiquitousItemPercentDownloadedKey, NSMetadataUbiquitousItemPercentUploadedKey, NSMetadataItemFSSizeKey]
+            query.searchScopes = [self.scope.rawValue]
+            var updateObserver: NSObjectProtocol?
+            updateObserver = NotificationCenter.default.addObserver(forName: .NSMetadataQueryDidUpdate, object: query, queue: nil, using: { (notification) in
+                query.disableUpdates()
+                
+                guard let item = (query.results as? [NSMetadataItem])?.first else {
+                    return
+                }
+                
+                if progress?.totalUnitCount == 0, let size = item.value(forAttribute: NSMetadataItemFSSizeKey) as? Int64 {
+                    progress?.totalUnitCount = size
+                }
+                let downloaded = item.value(forAttribute: NSMetadataUbiquitousItemPercentDownloadedKey) as? Double ?? 0
+                let uploaded = item.value(forAttribute: NSMetadataUbiquitousItemPercentUploadedKey) as? Double ?? 0
+                if (downloaded == 0 || downloaded == 100) && (uploaded > 0 && uploaded < 100) {
+                    progress?.completedUnitCount = Int64(uploaded / 100 * Double(progress?.totalUnitCount ?? 0))
+                    DispatchQueue.main.async {
+                        self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(uploaded / 100))
+                    }
+                } else if (uploaded == 0 || uploaded == 100) && (downloaded > 0 && downloaded < 100) {
+                    progress?.completedUnitCount = Int64(downloaded / 100 * Double(progress?.totalUnitCount ?? 0))
+                    DispatchQueue.main.async {
+                        self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(downloaded / 100))
+                    }
+                } else if uploaded == 100 || downloaded == 100 {
+                    progress?.completedUnitCount = progress?.totalUnitCount ?? 0
+                    query.stop()
+                    NotificationCenter.default.removeObserver(updateObserver!)
+                    DispatchQueue.main.async {
+                        self.delegate?.fileproviderSucceed(self, operation: opType)
+                    }
+                }
+                
+                query.enableUpdates()
+            })
+            
+            DispatchQueue.main.async {
+                progress?.setUserInfoObject(Date(), forKey: .startingTimeKey)
+                query.start()
            }
        }
    }
    
-    /**
-     Genrates a public url to a file to be shared with other users and can be downloaded without authentication.
-     
-     - Important: URL will be available for a limitied time, determined in `expiration` argument.
-     
-     - Parameters:
-     - to: path of file, including file/directory name.
-     - completionHandler: a closure with result of directory entries or error.
-     `link`: a url returned by Dropbox to share.
-     `attribute`: a `FileObject` containing the attributes of the item.
-     `expiration`: a `Date` object, determines when the public url will expires.
-     `error`: Error returned by Dropbox.
-     */
    open func publicLink(to path: String, completionHandler: @escaping ((_ link: URL?, _ attribute: FileObject?, _ expiration: Date?, _ error: Error?) -> Void)) {
        operation_queue.addOperation {
            do {
@@ -685,6 +754,39 @@ open class CloudFileProvider: LocalFileProvider {
    }
 }

+extension CloudFileProvider {
+    
+    /// Removes local copy of file, but spares cloud copy.
+    /// - Parameter path: Path of file or directory to be removed from local
+    /// - Parameter completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
+    open func evictItem(path: String, completionHandler: SimpleCompletionHandler) {
+        operation_queue.addOperation {
+            do {
+                try self.opFileManager.evictUbiquitousItem(at: self.url(of: path))
+                completionHandler?(nil)
+            } catch let e {
+                completionHandler?(e)
+            }
+        }
+    }
+    
+    /// Returns current version of file on this device and all versions of files in user devices.
+    /// - Parameter path: Path of file or directory.
+    /// - Parameter completionHandler: Retrieve current version on this device and all versions available. `currentVersion` will be nil if file doesn't exist. If an error parameter was provided, a presentable `Error` will be returned.
+    func versionsOfItem(path: String, completionHandler: @escaping ((_ currentVersion: NSFileVersion?, _ versions: [NSFileVersion], _ error: Error?) -> Void)) {
+        NotImplemented()
+    }
+    
+    /// Resolves conflicts by selecting a version.
+    /// - Parameter path: Path of file or directory.
+    /// - Parameter version: Version than will be choose as main version. `nil` value indicates current version on this device will be selected.
+    /// - Parameter completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
+    func selectVersionOfItem(path: String, version: NSFileVersion? = nil, completionHandler: SimpleCompletionHandler) {
+        NotImplemented()
+    }
+}
+
+/// Scope of iCloud, wrapper for NSMetadataQueryUbiquitous...Scope constants
 public enum UbiquitousScope: RawRepresentable {
    /// Search all files not in the Documents directories of the app’s iCloud container directories.
    /// Use this scope to store user-related data files that your app needs to share 
@@ -717,89 +819,36 @@ public enum UbiquitousScope: RawRepresentable {
    }
 }

-open class CloudOperationHandle: OperationHandle {
-    public let baseURL: URL?
-    public let operationType: FileOperationType
+/*
+func getMetadataItem(url: URL) -> NSMetadataItem? {
+    let query = NSMetadataQuery()
+    query.predicate = NSPredicate(format: "(%K LIKE %@)", NSMetadataItemPathKey, url.path)
+    query.searchScopes = [NSMetadataQueryUbiquitousDocumentsScope, NSMetadataQueryUbiquitousDataScope]
    
-    init (operationType: FileOperationType, baseURL: URL?) {
-        self.baseURL = baseURL
-        self.operationType = operationType
-    }
+    var item: NSMetadataItem?
    
-    private var sourceURL: URL? {
-        guard let source = operationType.source, let baseURL = baseURL else { return nil }
-        return source.hasPrefix("file://") ? URL(fileURLWithPath: source) : baseURL.appendingPathComponent(source)
-    }
-    
-    private var destURL: URL? {
-        guard let dest = operationType.destination, let baseURL = baseURL else { return nil }
-        return dest.hasPrefix("file://") ? URL(fileURLWithPath: dest) : baseURL.appendingPathComponent(dest)
-    }
-    
-    open var bytesSoFar: Int64 {
-        assert(!Thread.isMainThread, "Don't run \(#function) method on main thread")
-        
-        guard let url = destURL ?? sourceURL, let item = CloudOperationHandle.getMetadataItem(url: url) else { return 0 }
-        let downloaded = item.value(forAttribute: NSMetadataUbiquitousItemPercentDownloadedKey) as? Double ?? 0
-        let uploaded = item.value(forAttribute: NSMetadataUbiquitousItemPercentUploadedKey) as? Double ?? 0
-        guard let size = item.value(forAttribute: NSMetadataItemFSSizeKey) as? Int64 else { return -1 }
-        if (downloaded == 0 || downloaded == 100) && (uploaded > 0 && uploaded < 100) {
-            return Int64(uploaded * (Double(size) / 100))
-        } else if (uploaded == 0 || uploaded == 100) && (downloaded > 0 && downloaded < 100) {
-            return Int64(downloaded * (Double(size) / 100))
-        } else if uploaded == 100 || downloaded == 100 {
-            return size
+    let group = DispatchGroup()
+    group.enter()
+    var finishObserver: NSObjectProtocol?
+    finishObserver = NotificationCenter.default.addObserver(forName: .NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
+        defer {
+            query.stop()
+            group.leave()
+            NotificationCenter.default.removeObserver(finishObserver!)
        }
-        return 0
-    }
-    
-    open var totalBytes: Int64 {
-        assert(!Thread.isMainThread, "Don't run \(#function) method on main thread")
-        guard let url = destURL ?? sourceURL, let item = CloudOperationHandle.getMetadataItem(url: url) else { return -1 }
-        return item.value(forAttribute: NSMetadataItemFSSizeKey) as? Int64 ?? -1
-    }
-    
-    open var inProgress: Bool {
-        guard let url = destURL ?? sourceURL, let item = CloudOperationHandle.getMetadataItem(url: url) else { return false }
-        let downloadStatus = item.value(forAttribute: NSMetadataUbiquitousItemDownloadingStatusKey) as? String ?? NSMetadataUbiquitousItemDownloadingStatusNotDownloaded
-        let isUploading = item.value(forAttribute: NSMetadataUbiquitousItemIsUploadingKey) as? Bool ?? false
-        return downloadStatus == NSMetadataUbiquitousItemDownloadingStatusCurrent || isUploading
-    }
-    
-    /// Not usable in local provider
-    open func cancel() -> Bool {
-        return false
-    }
-    
-    fileprivate static func getMetadataItem(url: URL) -> NSMetadataItem? {
-        let query = NSMetadataQuery()
-        query.predicate = NSPredicate(format: "(%K LIKE %@)", NSMetadataItemPathKey, url.path)
-        query.searchScopes = [NSMetadataQueryUbiquitousDocumentsScope, NSMetadataQueryUbiquitousDataScope]
        
-        var item: NSMetadataItem?
-        
-        let group = DispatchGroup()
-        group.enter()
-        var finishObserver: NSObjectProtocol?
-        finishObserver = NotificationCenter.default.addObserver(forName: .NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
-            defer {
-                query.stop()
-                group.leave()
-                NotificationCenter.default.removeObserver(finishObserver!)
-            }
-            
-            if query.resultCount > 0 {
-                item = query.result(at: 0) as? NSMetadataItem
-            }
-            
-            query.disableUpdates()
-            
-        })
-        
-        DispatchQueue.main.async {
-            query.start()
+        if query.resultCount > 0 {
+            item = query.result(at: 0) as? NSMetadataItem
        }
-        _ = group.wait(timeout: .now() + 30)
-        return item
+        
+        query.disableUpdates()
+        
+    })
+    
+    DispatchQueue.main.async {
+        query.start()
    }
+    _ = group.wait(timeout: .now() + 30)
+    return item
 }
+*/
@@ -16,73 +16,14 @@ import CoreGraphics
 
 - Note: Uploading files and data are limited to 150MB, for now.
 */
-open class DropboxFileProvider: FileProviderBasicRemote {
-    open class var type: String { return "DropBox" }
-    open let baseURL: URL?
-    open var currentPath: String
+open class DropboxFileProvider: HTTPFileProvider {
+    override open class var type: String { return "Dropbox" }
    
    /// Dropbox RPC API URL, which is equal with [https://api.dropboxapi.com/2/](https://api.dropboxapi.com/2/)
    open let apiURL: URL
    /// Dropbox contents download/upload API URL, which is equal with [https://content.dropboxapi.com/2/](https://content.dropboxapi.com/2/)
    open let contentURL: URL
    
-    open var dispatch_queue: DispatchQueue
-    open var operation_queue: OperationQueue {
-        willSet {
-            assert(_session == nil, "It's not effective to change dispatch_queue property after session is initialized.")
-        }
-    }
-    
-    open weak var delegate: FileProviderDelegate?
-    open var credential: URLCredential? {
-        didSet {
-            sessionDelegate?.credential = self.credential
-        }
-    }
-    open private(set) var cache: URLCache?
-    public var useCache: Bool
-    public var validatingCache: Bool
-   
-    fileprivate var _session: URLSession?
-    fileprivate var sessionDelegate: SessionDelegate?
-    public var session: URLSession {
-        get {
-            if _session == nil {
-                self.sessionDelegate = SessionDelegate(fileProvider: self, credential: credential)
-                let config = URLSessionConfiguration.default
-                config.urlCache = cache
-                config.requestCachePolicy = .returnCacheDataElseLoad
-                _session = URLSession(configuration: config, delegate: sessionDelegate as URLSessionDelegate?, delegateQueue: self.operation_queue)
-                _session!.sessionDescription = UUID().uuidString
-                initEmptySessionHandler(_session!.sessionDescription!)
-            }
-            return _session!
-        }
-        
-        set {
-            assert(newValue.delegate is SessionDelegate, "session instances should have a SessionDelegate instance as delegate.")
-            _session = newValue
-            if session.sessionDescription?.isEmpty ?? true {
-                _session?.sessionDescription = UUID().uuidString
-            }
-            initEmptySessionHandler(_session!.sessionDescription!)
-        }
-    }
-    
-    internal var completionHandlersForTasks = [Int: SimpleCompletionHandler]()
-    internal var downloadCompletionHandlersForTasks = [Int: (URL) -> Void]()
-    internal var dataCompletionHandlersForTasks = [Int: (Data) -> Void]()
-    
-    fileprivate var _longpollSession: URLSession?
-    internal var longpollSession: URLSession {
-        if _longpollSession == nil {
-            let config = URLSessionConfiguration.default
-            config.timeoutIntervalForRequest = 600
-            _longpollSession = URLSession(configuration: config, delegate: nil, delegateQueue: nil)
-        }
-        return _longpollSession!
-    }
-    
    /**
     Initializer for Dropbox provider with given client ID and Token.
     These parameters must be retrieved via [OAuth2 API of Dropbox](https://www.dropbox.com/developers/reference/oauth-guide).
@@ -94,19 +35,9 @@ open class DropboxFileProvider: FileProviderBasicRemote {
     - Parameter cache: A URLCache to cache downloaded files and contents.
    */
    public init(credential: URLCredential?, cache: URLCache? = nil) {
-        self.baseURL = nil
-        self.currentPath = ""
-        self.useCache = false
-        self.validatingCache = true
-        self.cache = cache
-        self.credential = credential
-        
        self.apiURL = URL(string: "https://api.dropboxapi.com/2/")!
        self.contentURL = URL(string: "https://content.dropboxapi.com/2/")!
-        
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: .concurrent)
-        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
+        super.init(baseURL: nil, credential: credential, cache: cache)
    }
    
    public required convenience init?(coder aDecoder: NSCoder) {
@@ -116,18 +47,7 @@ open class DropboxFileProvider: FileProviderBasicRemote {
        self.validatingCache = aDecoder.decodeBool(forKey: "validatingCache")
    }
    
-    public func encode(with aCoder: NSCoder) {
-        aCoder.encode(self.credential, forKey: "credential")
-        aCoder.encode(self.currentPath, forKey: "currentPath")
-        aCoder.encode(self.useCache, forKey: "useCache")
-        aCoder.encode(self.validatingCache, forKey: "validatingCache")
-    }
-    
-    public static var supportsSecureCoding: Bool {
-        return true
-    }
-    
-    open func copy(with zone: NSZone? = nil) -> Any {
+    override open func copy(with zone: NSZone? = nil) -> Any {
        let copy = DropboxFileProvider(credential: self.credential, cache: self.cache)
        copy.currentPath = self.currentPath
        copy.delegate = self.delegate
@@ -137,31 +57,19 @@ open class DropboxFileProvider: FileProviderBasicRemote {
        return copy
    }
    
-    deinit {
-        if let sessionuuid = _session?.sessionDescription {
-            removeSessionHandler(for: sessionuuid)
-        }
-        
-        if fileProviderCancelTasksOnInvalidating {
-            _session?.invalidateAndCancel()
-        } else {
-            _session?.finishTasksAndInvalidate()
-        }
-        
-    }
-    
-    open func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
-        list(path) { (contents, cursor, error) in
+    open override func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
+        let progress = Progress(parent: nil, userInfo: nil)
+        list(path, progress: progress) { (contents, cursor, error) in
            completionHandler(contents, error)
        }
    }
    
-    open func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
+    open override func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
        let url = URL(string: "files/get_metadata", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        let requestDictionary: [String: AnyObject] = ["path": correctPath(path)! as NSString]
        request.httpBody = Data(jsonDictionary: requestDictionary)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
@@ -179,11 +87,11 @@ open class DropboxFileProvider: FileProviderBasicRemote {
        task.resume()
    }
    
-    open func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
+    open override func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
        let url = URL(string: "users/get_space_usage", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
+        request.set(httpAuthentication: credential, with: .oAuth2)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
            var totalSize: Int64 = -1
            var usedSize: Int64 = 0
@@ -196,12 +104,13 @@ open class DropboxFileProvider: FileProviderBasicRemote {
        task.resume()
    }
    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
+    open override func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
+        let progress = Progress(parent: nil, userInfo: nil)
        var foundFiles = [DropboxFileObject]()
        if let queryStr = query.findValue(forKey: "name", operator: .beginsWith) as? String {
            // Dropbox only support searching for file names begin with query in non-enterprise accounts.
            // We will use it if there is a `name BEGINSWITH[c] "query"` in predicate, then filter to form final result.
-            search(path, query: queryStr, foundItem: { (file) in
+            search(path, query: queryStr, progress: progress, foundItem: { (file) in
                if query.evaluate(with: file.mapPredicate()) {
                    foundFiles.append(file)
                    foundItemHandler?(file)
@@ -212,7 +121,7 @@ open class DropboxFileProvider: FileProviderBasicRemote {
        } else {
            // Dropbox doesn't support searching attributes natively. The workaround is to fallback to listing all files
            // and filter it locally. It may have a network burden in case there is many files in Dropbox, so please use it concisely.
-            list(path, recursive: true, progressHandler: { (files, _, error) in
+            list(path, recursive: true, progress: progress, progressHandler: { (files, _, error) in
                for file in files where query.evaluate(with: file.mapPredicate()) {
                    foundItemHandler?(file)
                }
@@ -221,41 +130,60 @@ open class DropboxFileProvider: FileProviderBasicRemote {
                completionHandler(predicatedFiles, error)
            })
        }
+        return progress
    }
    
-    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
+    open override func isReachable(completionHandler: @escaping (Bool) -> Void) {
        self.storageProperties { total, _ in
            completionHandler(total > 0)
        }
    }
    
-    open weak var fileOperationDelegate: FileOperationDelegate?
-}
-
-extension DropboxFileProvider: FileProviderOperations {
-    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let path = (atPath as NSString).appendingPathComponent(folderName) + "/"
-        return doOperation(.create(path: path), completionHandler: completionHandler)
-    }
-    
-    open func moveItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        return doOperation(.move(source: path, destination: toPath), completionHandler: completionHandler)
-    }
-    
-    open func copyItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        return doOperation(.copy(source: path, destination: toPath), completionHandler: completionHandler)
-    }
-    
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        return doOperation(.remove(path: path), completionHandler: completionHandler)
-    }
-    
-    fileprivate func doOperation(_ operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: operation) ?? true == true else {
-            return nil
+    override func request(for operation: FileOperationType, overwrite: Bool, attributes: [URLResourceKey : Any]) -> URLRequest {
+        // content operations
+        var request: URLRequest
+        switch operation {
+        case .copy(source: let source, destination: let dest) where dest.lowercased().hasPrefix("file://"):
+            let url = URL(string: "files/download", relativeTo: contentURL)!
+            request = URLRequest(url: url)
+            request.set(httpAuthentication: credential, with: .oAuth2)
+            request.set(dropboxArgKey: ["path": correctPath(source)! as NSString])
+        case .fetch(let path):
+            let url = URL(string: "files/download", relativeTo: contentURL)!
+            request = URLRequest(url: url)
+            request.set(httpAuthentication: credential, with: .oAuth2)
+            request.set(dropboxArgKey: ["path": correctPath(path)! as NSString])
+        case .copy(source: let source, destination: let dest) where source.lowercased().hasPrefix("file://"):
+            var requestDictionary = [String: AnyObject]()
+            let url: URL = URL(string: "files/upload", relativeTo: contentURL)!
+            requestDictionary["path"] = correctPath(dest) as NSString?
+            requestDictionary["mode"] = (overwrite ? "overwrite" : "add") as NSString
+            requestDictionary["client_modified"] = (attributes[.contentModificationDateKey] as? Date)?.rfc3339utc() as NSString?
+            request = URLRequest(url: url)
+            request.httpMethod = "POST"
+            request.set(httpAuthentication: credential, with: .oAuth2)
+            request.set(contentType: .stream)
+            request.set(dropboxArgKey: requestDictionary)
+        case .modify(let path):
+            var requestDictionary = [String: AnyObject]()
+            let url: URL = URL(string: "files/upload", relativeTo: contentURL)!
+            requestDictionary["path"] = correctPath(path) as NSString?
+            requestDictionary["mode"] = (overwrite ? "overwrite" : "add") as NSString
+            requestDictionary["client_modified"] = (attributes[.contentModificationDateKey] as? Date)?.rfc3339utc() as NSString?
+            request = URLRequest(url: url)
+            request.httpMethod = "POST"
+            request.set(httpAuthentication: credential, with: .oAuth2)
+            request.set(contentType: .stream)
+            request.set(dropboxArgKey: requestDictionary)
+        default: // modify, link, fetch
+            return self.apiRequest(for: operation)
        }
+        return request
+    }
+    
+    func apiRequest(for operation: FileOperationType) -> URLRequest {
        let url: String
-        guard let sourcePath = operation.source else { return nil }
+        let sourcePath = operation.source
        let destPath = operation.destination
        switch operation {
        case .create:
@@ -267,12 +195,12 @@ extension DropboxFileProvider: FileProviderOperations {
        case .remove:
            url = "files/delete"
        default: // modify, link, fetch
-            return nil
+            fatalError("Unimplemented operation \(operation.description) in \(#file)")
        }
        var request = URLRequest(url: URL(string: url, relativeTo: apiURL)!)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        var requestDictionary = [String: AnyObject]()
        if let dest = correctPath(destPath) as NSString? {
            requestDictionary["from_path"] = correctPath(sourcePath) as NSString?
@@ -281,114 +209,27 @@ extension DropboxFileProvider: FileProviderOperations {
            requestDictionary["path"] = correctPath(sourcePath) as NSString?
        }
        request.httpBody = Data(jsonDictionary: requestDictionary)
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var serverError: FileProviderDropboxError?
-            if let response = response as? HTTPURLResponse, response.statusCode >= 300, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) {
-                 serverError = FileProviderDropboxError(code: code, path: sourcePath, errorDescription: String(data: data ?? Data(), encoding: .utf8))
-            }
-            completionHandler?(serverError ?? error)
-            self.delegateNotify(operation, error: serverError ?? error)
-        })
-        task.taskDescription = operation.json
-        task.resume()
-        return RemoteOperationHandle(operationType: operation, tasks: [task])
+        return request
    }
    
-    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: localFile.absoluteString, destination: toPath)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        return upload_simple(toPath, localFile: localFile, overwrite: overwrite, operation: opType, completionHandler: completionHandler)
+    override func serverError(with code: FileProviderHTTPErrorCode, path: String?, data: Data?) -> FileProviderHTTPError {
+        return FileProviderDropboxError(code: code, path: path ?? "", errorDescription: data.flatMap({ String(data: $0, encoding: .utf8) }))
    }
    
-    open func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: path, destination: destURL.absoluteString)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        let url = URL(string: "files/download", relativeTo: contentURL)!
-        var request = URLRequest(url: url)
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let requestDictionary: [String: AnyObject] = ["path": path as NSString]
-        let requestJson = String(jsonDictionary: requestDictionary) ?? ""
-        request.setValue(requestJson, forHTTPHeaderField: "Dropbox-API-Arg")
-        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[task.taskIdentifier] = completionHandler
-        downloadCompletionHandlersForTasks[task.taskIdentifier] = { tempURL in
-            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
-                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
-                let errorData : Data? = nil //Data(contentsOf:cacheURL) // TODO: Figure out how to get error response data for the error description
-                let serverError : FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: errorData ?? Data(), encoding: .utf8)) : nil
-                completionHandler?(serverError)
-                return
-            }
-            do {
-                try FileManager.default.moveItem(at: tempURL, to: destURL)
-                completionHandler?(nil)
-            } catch let e {
-                completionHandler?(e)
-            }
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
-    }
-}
-
-extension DropboxFileProvider: FileProviderReadWrite {
-    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
-        if length == 0 || offset < 0 {
-            dispatch_queue.async {
-                completionHandler(Data(), nil)
-            }
+    override func upload_simple(_ targetPath: String, request: URLRequest, data: Data?, localFile: URL?, operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let size = data?.count ?? Int((try? localFile?.resourceValues(forKeys: [.fileSizeKey]))??.fileSize ?? -1)
+        if size > 150 * 1024 * 1024 {
+            let error = FileProviderDropboxError(code: .payloadTooLarge, path: targetPath, errorDescription: nil)
+            completionHandler?(error)
+            self.delegateNotify(operation, error: error)
            return nil
        }
        
-        let opType = FileOperationType.fetch(path: path)
-        let url = URL(string: "files/download", relativeTo: contentURL)!
-        var request = URLRequest(url: url)
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        if length > 0 {
-            request.setValue("bytes=\(offset)-\(offset + Int64(length) - 1)", forHTTPHeaderField: "Range")
-        } else if offset > 0 && length < 0 {
-            request.setValue("bytes=\(offset)-", forHTTPHeaderField: "Range")
-        }
-        let requestDictionary: [String: AnyObject] = ["path": correctPath(path)! as NSString]
-        request.setValue(String(jsonDictionary: requestDictionary), forHTTPHeaderField: "Dropbox-API-Arg")
-        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[task.taskIdentifier] = { error in
-            completionHandler(nil, error)
-        }
-        downloadCompletionHandlersForTasks[task.taskIdentifier] = { tempURL in
-            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
-                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
-                let errorData : Data? = nil //Data(contentsOf:cacheURL) // TODO: Figure out how to get error response data for the error description
-                let serverError : FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: errorData ?? Data(), encoding: .utf8)) : nil
-                completionHandler(nil, serverError)
-                return
-            }
-            do {
-                let data = try Data(contentsOf: tempURL)
-                completionHandler(data, nil)
-            } catch let e {
-                completionHandler(nil, e)
-            }
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
+        return super.upload_simple(targetPath, request: request, data: data, localFile: localFile, operation: operation, completionHandler: completionHandler)
    }
-    
-    public func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.modify(path: path)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        // FIXME: remove 150MB restriction
-        return upload_simple(path, data: data ?? Data(), overwrite: overwrite, operation: opType, completionHandler: completionHandler)
-    }
-    
+}
+
+extension DropboxFileProvider {
    /*
    fileprivate func registerNotifcation(path: String, eventHandler: (() -> Void)) {
        /* There is two ways to monitor folders changing in Dropbox. Either using webooks
@@ -406,26 +247,13 @@ extension DropboxFileProvider: FileProviderReadWrite {
    // TODO: Implement /get_account & /get_current_account
 }

-extension DropboxFileProvider {
-    /**
-     Genrates a public url to a file to be shared with other users and can be downloaded without authentication.
-     
-     - Important: URL will be available for a limitied time (4 hours according to Dropbox documentation).
-     
-     - Parameters:
-       - to: path of file, including file/directory name.
-       - completionHandler: a closure with result of directory entries or error.
-         - `link`: a url returned by Dropbox to share.
-         - `attribute`: a `FileObject` containing the attributes of the item.
-         - `expiration`: a `Date` object, determines when the public url will expires.
-         - `error`: Error returned by Dropbox.
-    */
-    open func publicLink(to path: String, completionHandler: @escaping ((_ link: URL?, _ attribute: DropboxFileObject?, _ expiration: Date?, _ error: Error?) -> Void)) {
+extension DropboxFileProvider: FileProviderSharing {
+    open func publicLink(to path: String, completionHandler: @escaping ((_ link: URL?, _ attribute: FileObject?, _ expiration: Date?, _ error: Error?) -> Void)) {
        let url = URL(string: "files/get_temporary_link", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        let requestDictionary: [String: AnyObject] = ["path": correctPath(path)! as NSString]
        request.httpBody = Data(jsonDictionary: requestDictionary)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
@@ -470,8 +298,8 @@ extension DropboxFileProvider {
        let url = URL(string: "files/save_url", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        let requestDictionary: [String: AnyObject] = ["path": correctPath(toPath)! as NSString, "url" : remoteURL.absoluteString as NSString]
        request.httpBody = Data(jsonDictionary: requestDictionary)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
@@ -505,8 +333,8 @@ extension DropboxFileProvider {
        let url = URL(string: "files/copy_reference/save", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        let requestDictionary: [String: AnyObject] = ["path": correctPath(toPath)! as NSString, "copy_reference" : reference as NSString]
        request.httpBody = Data(jsonDictionary: requestDictionary)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
@@ -554,26 +382,37 @@ extension DropboxFileProvider: ExtendedFileProvider {
    /// Default value for dimension is 64x64, according to Dropbox documentation
    open func thumbnailOfFile(path: String, dimension: CGSize?, completionHandler: @escaping ((_ image: ImageClass?, _ error: Error?) -> Void)) {
        let url: URL
+        let thumbAPI: Bool
        switch (path as NSString).pathExtension.lowercased() {
        case "jpg", "jpeg", "gif", "bmp", "png", "tif", "tiff":
            url = URL(string: "files/get_thumbnail", relativeTo: contentURL)!
+            thumbAPI = true
        case "doc", "docx", "docm", "xls", "xlsx", "xlsm":
            fallthrough
        case  "ppt", "pps", "ppsx", "ppsm", "pptx", "pptm":
            fallthrough
        case "rtf":
            url = URL(string: "files/get_preview", relativeTo: contentURL)!
+            thumbAPI = false
        default:
            return
        }
        var request = URLRequest(url: url)
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
+        request.set(httpAuthentication: credential, with: .oAuth2)
        var requestDictionary: [String: AnyObject] = ["path": path as NSString]
-        requestDictionary["format"] = "jpeg" as NSString
-        if let dimension = dimension {
-            requestDictionary["size"] = "w\(Int(dimension.width))h\(Int(dimension.height))" as NSString
+        if thumbAPI {
+            requestDictionary["format"] = "jpeg" as NSString
+            let size: String
+            switch dimension?.height ?? 64 {
+            case 0...32:    size = "w32h32"
+            case 33...64:   size = "w64h64"
+            case 65...128:  size = "w128h128"
+            case 129...480: size = "w640h480"
+            default: size = "w1024h768"
+            }
+            requestDictionary["size"] = size as NSString
        }
-        request.setValue(String(jsonDictionary: requestDictionary), forHTTPHeaderField: "Dropbox-API-Arg")
+        request.set(dropboxArgKey: requestDictionary)
        let task = self.session.dataTask(with: request, completionHandler: { (data, response, error) in
            var image: ImageClass? = nil
            if let r = response as? HTTPURLResponse, let result = r.allHeaderFields["Dropbox-API-Result"] as? String, let jsonResult = result.deserializeJSON() {
@@ -586,8 +425,12 @@ extension DropboxFileProvider: ExtendedFileProvider {
                    image = pageImage
                } else if let contentType = (response as? HTTPURLResponse)?.allHeaderFields["Content-Type"] as? String, contentType.contains("text/html") {
                     // TODO: Implement converting html returned type of get_preview to image
-                } else {
-                    image = ImageClass(data: data)
+                } else if let fetchedimage = ImageClass(data: data){
+                    if let dimension = dimension {
+                        image = DropboxFileProvider.scaleDown(image: fetchedimage, toSize: dimension)
+                    } else {
+                        image = fetchedimage
+                    }
                }
            }
            completionHandler(image, error)
@@ -599,8 +442,8 @@ extension DropboxFileProvider: ExtendedFileProvider {
        let url = URL(string: "files/get_metadata", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        let requestDictionary: [String: AnyObject] = ["path": correctPath(path)! as NSString, "include_media_info": NSNumber(value: true)]
        request.httpBody = Data(jsonDictionary: requestDictionary)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
@@ -610,7 +453,7 @@ extension DropboxFileProvider: ExtendedFileProvider {
            if let response = response as? HTTPURLResponse {
                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
                serverError = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
-                if let json = data?.deserializeJSON(), let properties = json["media_info"] as? [String: Any] {
+                if let json = data?.deserializeJSON(), let properties = (json["media_info"] as? [String: Any])?["metadata"] as? [String: Any] {
                    (dic, keys) = self.mapMediaInfo(properties)
                }
            }
@@ -619,5 +462,3 @@ extension DropboxFileProvider: ExtendedFileProvider {
        task.resume()
    }
 }
-
-extension DropboxFileProvider: FileProvider { }
@@ -17,19 +17,15 @@ public struct FileProviderDropboxError: FileProviderHTTPError {

 /// Containts path, url and attributes of a Dropbox file or resource.
 public final class DropboxFileObject: FileObject {
-    internal init(name: String, path: String) {
-        super.init(url: URL(string: path) ?? URL(string: "/")!, name: name, path: path)
-    }
-    
    internal convenience init? (jsonStr: String) {
        guard let json = jsonStr.deserializeJSON() else { return nil }
        self.init(json: json)
    }
    
-    internal convenience init? (json: [String: AnyObject]) {
+    internal init? (json: [String: AnyObject]) {
        guard let name = json["name"] as? String else { return nil }
        guard let path = json["path_display"] as? String else { return nil }
-        self.init(name: name, path: path)
+        super.init(url: nil, name: name, path: path)
        self.size = (json["size"] as? NSNumber)?.int64Value ?? -1
        self.serverTime = Date(rfcString: json["server_modified"] as? String ?? "")
        self.modifiedDate = Date(rfcString: json["client_modified"] as? String ?? "")
@@ -75,7 +71,11 @@ public final class DropboxFileObject: FileObject {

 // codebeat:disable[ARITY]
 internal extension DropboxFileProvider {
-    func list(_ path: String, cursor: String? = nil, prevContents: [DropboxFileObject] = [], recursive: Bool = false, session: URLSession? = nil, progressHandler: ((_ contents: [FileObject], _ nextCursor: String?, _ error: Error?) -> Void)? = nil, completionHandler: @escaping ((_ contents: [FileObject], _ cursor: String?, _ error: Error?) -> Void)) {
+    
+    
+    func list(_ path: String, cursor: String? = nil, prevContents: [DropboxFileObject] = [], recursive: Bool = false, session: URLSession? = nil, progress: Progress, progressHandler: ((_ contents: [FileObject], _ nextCursor: String?, _ error: Error?) -> Void)? = nil, completionHandler: @escaping ((_ contents: [FileObject], _ cursor: String?, _ error: Error?) -> Void)) {
+        if progress.isCancelled { return }
+        
        var requestDictionary = [String: AnyObject]()
        let url: URL
        if let cursor = cursor {
@@ -88,8 +88,8 @@ internal extension DropboxFileProvider {
        }
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        request.httpBody = Data(jsonDictionary: requestDictionary)
        let task = (session ?? self.session).dataTask(with: request, completionHandler: { (data, response, error) in
            var responseError: FileProviderDropboxError?
@@ -103,13 +103,14 @@ internal extension DropboxFileProvider {
                    for entry in entries {
                        if let entry = entry as? [String: AnyObject], let file = DropboxFileObject(json: entry) {
                            files.append(file)
+                            progress.totalUnitCount = Int64(files.count)
                        }
                    }
                    let ncursor = json["cursor"] as? String
                    let hasmore = (json["has_more"] as? NSNumber)?.boolValue ?? false
-                    if hasmore {
+                    if hasmore && !progress.isCancelled {
                        progressHandler?(files, ncursor, responseError ?? error)
-                        self.list(path, cursor: ncursor, prevContents: prevContents + files, completionHandler: completionHandler)
+                        self.list(path, cursor: ncursor, prevContents: prevContents + files, progress: progress, completionHandler: completionHandler)
                        return
                    }
                }
@@ -117,58 +118,22 @@ internal extension DropboxFileProvider {
            progressHandler?(files, nil, responseError ?? error)
            completionHandler(prevContents + files, nil, responseError ?? error)
        })
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
        task.taskDescription = FileOperationType.fetch(path: path).json
        task.resume()
    }
    
-    func upload_simple(_ targetPath: String, data: Data? = nil, localFile: URL? = nil, modifiedDate: Date = Date(), overwrite: Bool, operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let size = data?.count ?? Int((try? localFile?.resourceValues(forKeys: [.fileSizeKey]))??.fileSize ?? -1)
-        if size > 150 * 1024 * 1024 {
-            let error = FileProviderDropboxError(code: .payloadTooLarge, path: targetPath, errorDescription: nil)
-            completionHandler?(error)
-            self.delegateNotify(.create(path: targetPath), error: error)
-            return nil
-        }
-        var requestDictionary = [String: AnyObject]()
-        let url: URL
-        url = URL(string: "files/upload", relativeTo: contentURL)!
-        requestDictionary["path"] = correctPath(targetPath) as NSString?
-        requestDictionary["mode"] = (overwrite ? "overwrite" : "add") as NSString
-        requestDictionary["client_modified"] = modifiedDate.rfc3339utc() as NSString
-        var request = URLRequest(url: url)
-        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/octet-stream", forHTTPHeaderField: "Content-Type")
-        request.setValue(String(jsonDictionary: requestDictionary), forHTTPHeaderField: "Dropbox-API-Arg")
-        let task: URLSessionUploadTask
-        if let data = data {
-            task = session.uploadTask(with: request, from: data)
-        } else if let localFile = localFile {
-            task = session.uploadTask(with: request, fromFile: localFile)
-        } else {
-            return nil
-        }
+    func search(_ startPath: String = "", query: String, start: Int = 0, maxResultPerPage: Int = 25, maxResults: Int = -1, progress: Progress, foundItem:@escaping ((_ file: DropboxFileObject) -> Void), completionHandler: @escaping ((_ error: Error?) -> Void)) {
+        if progress.isCancelled { return }
        
-        completionHandlersForTasks[task.taskIdentifier] = { [weak self] error in
-            var responseError: FileProviderDropboxError?
-            if let code = (task.response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
-                // We can't fetch server result from delegate!
-                responseError = FileProviderDropboxError(code: rCode, path: targetPath, errorDescription: nil)
-            }
-            completionHandler?(responseError ?? error)
-            self?.delegateNotify(.create(path: targetPath), error: responseError ?? error)
-        }
-        task.taskDescription = operation.json
-        task.resume()
-        return RemoteOperationHandle(operationType: operation, tasks: [task])
-    }
-    
-    func search(_ startPath: String = "", query: String, start: Int = 0, maxResultPerPage: Int = 25, maxResults: Int = -1, foundItem:@escaping ((_ file: DropboxFileObject) -> Void), completionHandler: @escaping ((_ error: Error?) -> Void)) {
        let url = URL(string: "files/search", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/json", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        request.set(contentType: .json)
        var requestDictionary: [String: AnyObject] = ["path": startPath as NSString]
        requestDictionary["query"] = query as NSString
        requestDictionary["start"] = start as NSNumber
@@ -184,12 +149,13 @@ internal extension DropboxFileProvider {
                    for entry in entries {
                        if let entry = entry as? [String: AnyObject], let file = DropboxFileObject(json: entry) {
                            foundItem(file)
+                            progress.completedUnitCount += 1
                        }
                    }
                    let rstart = json["start"] as? Int
                    let hasmore = (json["more"] as? NSNumber)?.boolValue ?? false
-                    if hasmore, let rstart = rstart {
-                        self.search(startPath, query: query, start: rstart + entries.count, maxResultPerPage: maxResultPerPage, foundItem: foundItem, completionHandler: completionHandler)
+                    if hasmore && !progress.isCancelled, let rstart = rstart {
+                        self.search(startPath, query: query, start: rstart + entries.count, maxResultPerPage: maxResultPerPage, progress: progress, foundItem: foundItem, completionHandler: completionHandler)
                    } else {
                        completionHandler(responseError ?? error)
                    }
@@ -197,7 +163,11 @@ internal extension DropboxFileProvider {
                }
            }
            completionHandler(responseError ?? error)
-        }) 
+        })
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
        task.resume()
    }
 }
@@ -234,14 +204,4 @@ internal extension DropboxFileProvider {
        }
        return (dic, keys)
    }
-    
-    func delegateNotify(_ operation: FileOperationType, error: Error?) {
-        DispatchQueue.main.async(execute: {
-            if error == nil {
-                self.delegate?.fileproviderSucceed(self, operation: operation)
-            } else {
-                self.delegate?.fileproviderFailed(self, operation: operation)
-            }
-        })
-    }
 }
@@ -12,7 +12,7 @@ import CoreGraphics
 import AVFoundation

 extension LocalFileProvider: ExtendedFileProvider {
-    public func thumbnailOfFileSupported(path: String) -> Bool {
+    open func thumbnailOfFileSupported(path: String) -> Bool {
        switch (path as NSString).pathExtension.lowercased() {
        case LocalFileInformationGenerator.imageThumbnailExtensions:
            return true
@@ -31,7 +31,7 @@ extension LocalFileProvider: ExtendedFileProvider {
        }
    }
    
-    public func propertiesOfFileSupported(path: String) -> Bool {
+    open func propertiesOfFileSupported(path: String) -> Bool {
        let fileExt = (path as NSString).pathExtension.lowercased()
        switch fileExt {
        case LocalFileInformationGenerator.imagePropertiesExtensions:
@@ -54,7 +54,7 @@ extension LocalFileProvider: ExtendedFileProvider {
        }
    }
    
-    public func thumbnailOfFile(path: String, dimension: CGSize? = nil, completionHandler: @escaping ((_ image: ImageClass?, _ error: Error?) -> Void)) {
+    open func thumbnailOfFile(path: String, dimension: CGSize? = nil, completionHandler: @escaping ((_ image: ImageClass?, _ error: Error?) -> Void)) {
        let dimension = dimension ?? CGSize(width: 64, height: 64)
        (dispatch_queue).async {
            var thumbnailImage: ImageClass? = nil
@@ -86,7 +86,7 @@ extension LocalFileProvider: ExtendedFileProvider {
        }
    }
    
-    public func propertiesOfFile(path: String, completionHandler: @escaping ((_ propertiesDictionary: [String: Any], _ keys: [String], _ error: Error?) -> Void)) {
+    open func propertiesOfFile(path: String, completionHandler: @escaping ((_ propertiesDictionary: [String: Any], _ keys: [String], _ error: Error?) -> Void)) {
        (dispatch_queue).async {
            let fileExt = (path as NSString).pathExtension.lowercased()
            var getter: ((_ fileURL: URL) -> (prop: [String: Any], keys: [String]))?
@@ -197,8 +197,13 @@ public struct LocalFileInformationGenerator {
    static public var audioThumbnail: (_ fileURL: URL) -> ImageClass? = { fileURL in
        let playerItem = AVPlayerItem(url: fileURL)
        let metadataList = playerItem.asset.commonMetadata
+        #if swift(>=4.0)
+        let commonKeyArtwork = AVMetadataKey.commonKeyArtwork
+        #else
+        let commonKeyArtwork = AVMetadataCommonKeyArtwork
+        #endif
        for item in metadataList {
-            if item.commonKey == AVMetadataCommonKeyArtwork {
+            if item.commonKey == commonKeyArtwork {
                if let data = item.dataValue {
                    return ImageClass(data: data)
                }
@@ -319,28 +324,34 @@ public struct LocalFileInformationGenerator {
            guard let key = key else {
                return nil
            }
-            guard let regex = try? NSRegularExpression(pattern: "([a-z])([A-Z])" , options: NSRegularExpression.Options()) else {
+            guard let regex = try? NSRegularExpression(pattern: "([a-z])([A-Z])" , options: []) else {
                return nil
            }
-            let newKey = regex.stringByReplacingMatches(in: key, options: NSRegularExpression.MatchingOptions(), range: NSMakeRange(0, (key as NSString).length) , withTemplate: "$1 $2")
+            let newKey = regex.stringByReplacingMatches(in: key, options: [], range: NSRange(location: 0, length: (key as NSString).length) , withTemplate: "$1 $2")
            return newKey.capitalized
        }
        
-        if FileManager.default.fileExists(atPath: fileURL.path) {
-            let playerItem = AVPlayerItem(url: fileURL)
-            let metadataList = playerItem.asset.commonMetadata
-            for item in metadataList {
-                if let description = makeDescription(item.commonKey) {
-                    if let value = item.stringValue {
-                        keys.append(description)
-                        dic[description] = value
-                    }
+        guard FileManager.default.fileExists(atPath: fileURL.path) else {
+            return (dic, keys)
+        }
+        let playerItem = AVPlayerItem(url: fileURL)
+        let metadataList = playerItem.asset.commonMetadata
+        for item in metadataList {
+            #if swift(>=4.0)
+                let commonKey = item.commonKey?.rawValue
+            #else
+                let commonKey = item.commonKey
+            #endif
+            if let description = makeDescription(commonKey) {
+                if let value = item.stringValue {
+                    keys.append(description)
+                    dic[description] = value
                }
            }
-            if let ap = try? AVAudioPlayer(contentsOf: fileURL) {
-                add(key: "Duration", value: ap.duration.formatshort)
-                add(key: "Bitrate", value: ap.settings[AVSampleRateKey] as? Int)
-            }
+        }
+        if let ap = try? AVAudioPlayer(contentsOf: fileURL) {
+            add(key: "Duration", value: ap.duration.formatshort)
+            add(key: "Bitrate", value: ap.settings[AVSampleRateKey] as? Int)
        }
        return (dic, keys)
    }
@@ -366,7 +377,11 @@ public struct LocalFileInformationGenerator {
            }
        }
        let asset = AVURLAsset(url: fileURL, options: nil)
+        #if swift(>=4.0)
+        let videoTracks = asset.tracks(withMediaType: AVMediaType.video)
+        #else
        let videoTracks = asset.tracks(withMediaType: AVMediaTypeVideo)
+        #endif
        if let videoTrack = videoTracks.first {
            var bitrate: Float = 0
            let width = Int(videoTrack.naturalSize.width)
@@ -380,7 +395,11 @@ public struct LocalFileInformationGenerator {
            add(key: "Duration", value: TimeInterval(duration).formatshort)
            add(key: "Video Bitrate", value: "\(Int(ceil(bitrate / 1000))) kbps")
        }
+        #if swift(>=4.0)
+        let audioTracks = asset.tracks(withMediaType: AVMediaType.audio)
+        #else
        let audioTracks = asset.tracks(withMediaType: AVMediaTypeAudio)
+        #endif
        // dic["Audio channels"] = audioTracks.count
        var bitrate: Float = 0
        for track in audioTracks {
@@ -403,21 +422,40 @@ public struct LocalFileInformationGenerator {
        }
        
        func getKey(_ key: String, from dict: CGPDFDictionaryRef) -> String? {
-            var cfValue: CGPDFStringRef? = nil
-            if (CGPDFDictionaryGetString(dict, key, &cfValue)), let value = CGPDFStringCopyTextString(cfValue!) {
+            var cfStrValue: CGPDFStringRef?
+            if (CGPDFDictionaryGetString(dict, key, &cfStrValue)), let value = cfStrValue.flatMap({ CGPDFStringCopyTextString($0) }) {
                return value as String
            }
+            var cfArrayValue: CGPDFArrayRef?
+            if (CGPDFDictionaryGetArray(dict, key, &cfArrayValue)), let cfArray = cfArrayValue {
+                var array = [String]()
+                for i in 0..<CGPDFArrayGetCount(cfArray) {
+                    var cfItemValue: CGPDFStringRef?
+                    if CGPDFArrayGetString(cfArray, i, &cfItemValue), let item = cfItemValue.flatMap({ CGPDFStringCopyTextString($0) }) {
+                        array.append(item as String)
+                    }
+                }
+                return array.joined(separator: ", ")
+            }
            return nil
        }
        
        func convertDate(_ date: String?) -> Date? {
            guard let date = date else { return nil }
-            var dateStr = date
+            var dateStr = date.replacingOccurrences(of: "'", with: "")
            if dateStr.hasPrefix("D:") {
                dateStr.characters.removeFirst(2)
            }
            let dateFormatter = DateFormatter()
-            dateFormatter.dateFormat = "yyyyMMddHHmmssTZD"
+            dateFormatter.dateFormat = "yyyyMMddHHmmssTZ"
+            if let result = dateFormatter.date(from: dateStr) {
+                return result
+            }
+            dateFormatter.dateFormat = "yyyyMMddHHmmssZZZZZ"
+            if let result = dateFormatter.date(from: dateStr) {
+                return result
+            }
+            dateFormatter.dateFormat = "yyyyMMddHHmmssZ"
            if let result = dateFormatter.date(from: dateStr) {
                return result
            }
@@ -428,29 +466,32 @@ public struct LocalFileInformationGenerator {
            return nil
        }
        
-        if let provider = CGDataProvider(url: fileURL as CFURL), let reference = CGPDFDocument(provider), let dict = reference.info {
-            add(key: "Title", value: getKey("Title", from: dict))
-            add(key: "Author", value: getKey("Author", from: dict))
-            add(key: "Subject", value: getKey("Subject", from: dict))
-            var majorVersion: Int32 = 0
-            var minorVersion: Int32 = 0
-            reference.getVersion(majorVersion: &majorVersion, minorVersion: &minorVersion)
-            if majorVersion > 0 {
-                add(key: "Version", value:  String(majorVersion) + "." + String(minorVersion))
-            }
-            add(key: "Pages", value: reference.numberOfPages)
-            
-            if reference.numberOfPages > 0, let pageRef = reference.page(at: 1) {
-                let size = pageRef.getBoxRect(CGPDFBox.mediaBox).size
-                add(key: "Resolution", value: "\(Int(size.width))x\(Int(size.height))")
-            }
-            add(key: "Content creator", value: getKey("Creator", from: dict))
-            add(key: "Creation date", value: convertDate(getKey("CreationDate", from: dict)))
-            add(key: "Modified date", value: convertDate(getKey("ModDate", from: dict)))
-            add(key: "Security", value: reference.isEncrypted ? "Present" : "None")
-            add(key: "Allows printing", value: reference.allowsPrinting ? "Yes" : "No")
-            add(key: "Allows copying", value: reference.allowsCopying ? "Yes" : "No")
+        guard let provider = CGDataProvider(url: fileURL as CFURL), let reference = CGPDFDocument(provider), let dict = reference.info else {
+            return (dic, keys)
        }
+        add(key: "Title", value: getKey("Title", from: dict))
+        add(key: "Author", value: getKey("Author", from: dict))
+        add(key: "Subject", value: getKey("Subject", from: dict))
+        add(key: "Producer", value: getKey("Producer", from: dict))
+        add(key: "Keywords", value: getKey("Keywords", from: dict))
+        var majorVersion: Int32 = 0
+        var minorVersion: Int32 = 0
+        reference.getVersion(majorVersion: &majorVersion, minorVersion: &minorVersion)
+        if majorVersion > 0 {
+            add(key: "Version", value:  String(majorVersion) + "." + String(minorVersion))
+        }
+        add(key: "Pages", value: reference.numberOfPages)
+        
+        if reference.numberOfPages > 0, let pageRef = reference.page(at: 1) {
+            let size = pageRef.getBoxRect(CGPDFBox.mediaBox).size
+            add(key: "Resolution", value: "\(Int(size.width))x\(Int(size.height))")
+        }
+        add(key: "Content creator", value: getKey("Creator", from: dict))
+        add(key: "Creation date", value: convertDate(getKey("CreationDate", from: dict)))
+        add(key: "Modified date", value: convertDate(getKey("ModDate", from: dict)))
+        add(key: "Security", value: reference.isEncrypted)
+        add(key: "Allows printing", value: reference.allowsPrinting)
+        add(key: "Allows copying", value: reference.allowsCopying)
        return (dic, keys)
    }
    
@@ -23,9 +23,10 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
        return (_underlyingSession.delegate as? FPSStreamDelegate)
    }
    fileprivate var _taskIdentifier: Int
+    fileprivate var _taskDescription: String?
    
    /// Force using `URLSessionStreamTask` for iOS 9 and later
-    public var useURLSession = true
+    public let useURLSession: Bool
    @available(iOS 9.0, OSX 10.11, *)
    fileprivate static var streamTasks = [Int: URLSessionStreamTask]()
    
@@ -50,6 +51,33 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
        return _taskIdentifier
    }
    
+    /// An app-provided description of the current task.
+    ///
+    /// This value may be nil. It is intended to contain human-readable strings that you can
+    /// then display to the user as part of your app’s user interface.
+    open override var taskDescription: String? {
+        get {
+            if #available(iOS 9.0, OSX 10.11, *) {
+                if self.useURLSession {
+                    return _underlyingTask!.taskDescription
+                }
+            }
+            
+            return _taskDescription
+        }
+        @objc(setTaskDescription:)
+        set {
+            if #available(iOS 9.0, OSX 10.11, *) {
+                if self.useURLSession {
+                    _underlyingTask!.taskDescription = newValue
+                    return
+                }
+            }
+            
+            _taskDescription = newValue
+        }
+    }
+    
    fileprivate var _state: URLSessionTask.State = .suspended
    /**
     * The current state of the task—active, suspended, in the process 
@@ -93,8 +121,31 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
        }
    }
    
-    fileprivate var _countOfBytesSent: Int64 = 0
-    fileprivate var _countOfBytesRecieved: Int64 = 0
+    fileprivate var _countOfBytesSent: Int64 = 0 {
+        willSet {
+            for observer in observers where observer.keyPath == "countOfBytesSent" {
+                observer.observer.observeValue(forKeyPath: observer.keyPath, of: self, change: [.oldKey: _countOfBytesSent, .oldKey: newValue], context: observer.context)
+            }
+        }
+        didSet {
+            for observer in observers where observer.keyPath == "countOfBytesSent" {
+                observer.observer.observeValue(forKeyPath: observer.keyPath, of: self, change: [.oldKey: oldValue, .oldKey: _countOfBytesSent], context: observer.context)
+            }
+        }
+    }
+    
+    fileprivate var _countOfBytesRecieved: Int64 = 0 {
+        willSet {
+            for observer in observers where observer.keyPath == "countOfBytesRecieved" {
+                observer.observer.observeValue(forKeyPath: observer.keyPath, of: self, change: [.oldKey: _countOfBytesRecieved, .oldKey: newValue], context: observer.context)
+            }
+        }
+        didSet {
+            for observer in observers where observer.keyPath == "countOfBytesRecieved" {
+                observer.observer.observeValue(forKeyPath: observer.keyPath, of: self, change: [.oldKey: oldValue, .oldKey: _countOfBytesRecieved], context: observer.context)
+            }
+        }
+    }
    
    /**
     * The number of bytes that the task has sent to the server in the request body.
@@ -105,7 +156,7 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
     * `urlSession(_:task:didSendBodyData:totalBytesSent:totalBytesExpectedToSend:)` delegate method.
    */
    override open var countOfBytesSent: Int64 {
-        if #available(iOS 9.0, OSX 10.11, *) {
+        if #available(iOS 9.0, macOS 10.11, *) {
            if self.useURLSession {
                return _underlyingTask!.countOfBytesSent
            }
@@ -164,6 +215,49 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
        return Int64(dataReceived.count)
    }
    
+    var observers: [(keyPath: String, observer: NSObject, context: UnsafeMutableRawPointer?)] = []
+    
+    public override func addObserver(_ observer: NSObject, forKeyPath keyPath: String, options: NSKeyValueObservingOptions = [], context: UnsafeMutableRawPointer?) {
+        if #available(iOS 9.0, macOS 10.11, *) {
+            if self.useURLSession {
+                self._underlyingTask?.addObserver(observer, forKeyPath: keyPath, options: options, context: context)
+                return
+            }
+        }
+        
+        switch keyPath {
+        case #keyPath(countOfBytesSent):
+            fallthrough
+        case #keyPath(countOfBytesReceived):
+            fallthrough
+        case #keyPath(countOfBytesExpectedToSend):
+            fallthrough
+        case #keyPath(countOfBytesExpectedToReceive):
+            observers.append((keyPath: keyPath, observer: observer, context: context))
+        default:
+            break
+        }
+        super.addObserver(observer, forKeyPath: keyPath, options: options, context: context)
+    }
+    
+    public override func removeObserver(_ observer: NSObject, forKeyPath keyPath: String) {
+        var newObservers: [(keyPath: String, observer: NSObject, context: UnsafeMutableRawPointer?)] = []
+        for observer in observers where observer.keyPath != keyPath {
+            newObservers.append(observer)
+        }
+        self.observers = newObservers
+        super.removeObserver(observer, forKeyPath: keyPath)
+    }
+    
+    public override func removeObserver(_ observer: NSObject, forKeyPath keyPath: String, context: UnsafeMutableRawPointer?) {
+        var newObservers: [(keyPath: String, observer: NSObject, context: UnsafeMutableRawPointer?)] = []
+        for observer in observers where observer.keyPath != keyPath || observer.context != context {
+            newObservers.append(observer)
+        }
+        self.observers = newObservers
+        super.removeObserver(observer, forKeyPath: keyPath, context: context)
+    }
+    
    override public init() {
        fatalError("Use NSURLSession.fpstreamTask() method")
    }
@@ -171,10 +265,11 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
    fileprivate var host: (hostname: String, port: Int)?
    fileprivate var service: NetService?
    
-    internal init(session: URLSession, host: String, port: Int) {
+    internal init(session: URLSession, host: String, port: Int, useURLSession: Bool = true) {
        self._underlyingSession = session
+        self.useURLSession = useURLSession
        if #available(iOS 9.0, OSX 10.11, *) {
-            if self.useURLSession {
+            if useURLSession {
                let task = session.streamTask(withHostName: host, port: port)
                self._taskIdentifier = task.taskIdentifier
                FileProviderStreamTask.streamTasks[_taskIdentifier] = task
@@ -190,10 +285,11 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
        self.operation_queue.maxConcurrentOperationCount = 1
    }
    
-    internal init(session: URLSession, netService: NetService) {
+    internal init(session: URLSession, netService: NetService, useURLSession: Bool = true) {
        self._underlyingSession = session
+        self.useURLSession = useURLSession
        if #available(iOS 9.0, OSX 10.11, *) {
-            if self.useURLSession {
+            if useURLSession {
                let task = session.streamTask(with: netService)
                self._taskIdentifier = task.taskIdentifier
                FileProviderStreamTask.streamTasks[_taskIdentifier] = task
@@ -35,9 +35,7 @@ open class FTPFileProvider: FileProviderBasicRemote {
    public var validatingCache: Bool
    
    /// Determine either FTP session is in passive or active mode.
-    /// - Note: Due to `URLSessionStreamTask` restrictions for determining listening port,
-    /// only passive sessions are available in current implementation.
-    public let passiveMode = true
+    public let passiveMode: Bool
    
    /// Force to use URLSessionDownloadTask/URLSessionDataTask when possible
    public var useAppleImplementation = true
@@ -47,7 +45,7 @@ open class FTPFileProvider: FileProviderBasicRemote {
    public var session: URLSession {
        get {
            if _session == nil {
-                self.sessionDelegate = SessionDelegate(fileProvider: self, credential: credential)
+                self.sessionDelegate = SessionDelegate(fileProvider: self)
                let config = URLSessionConfiguration.default
                config.urlCache = cache
                config.requestCachePolicy = .returnCacheDataElseLoad
@@ -64,6 +62,7 @@ open class FTPFileProvider: FileProviderBasicRemote {
            if session.sessionDescription?.isEmpty ?? true {
                _session?.sessionDescription = UUID().uuidString
            }
+            self.sessionDelegate = newValue.delegate as? SessionDelegate
            initEmptySessionHandler(_session!.sessionDescription!)
        }
    }
@@ -71,32 +70,43 @@ open class FTPFileProvider: FileProviderBasicRemote {
    /**
     Initializer for FTP provider with given username and password.
     
+     - Note: `passive` value should be set according to server settings and firewall presence.
+     
     - Parameter baseURL: a url with `ftp://hostaddress/` format.
+     - Parameter passive: FTP server data connection, `true` means passive connection (data connection created by client)
+         and `false` means active connection (data connection created by server). Default is `true` (passive mode).
     - Parameter credential: a `URLCredential` object contains user and password.
     - Parameter cache: A URLCache to cache downloaded files and contents. (unimplemented for FTP and should be nil)
     */
-    public init? (baseURL: URL, credential: URLCredential? = nil, cache: URLCache? = nil) {
+    public init? (baseURL: URL, passive: Bool = true, credential: URLCredential? = nil, cache: URLCache? = nil) {
        guard (baseURL.scheme ?? "ftp").lowercased().hasPrefix("ftp") else { return nil }
        guard baseURL.host != nil else { return nil }
        var urlComponents = URLComponents(url: baseURL, resolvingAgainstBaseURL: true)!
-        urlComponents.port = urlComponents.port ?? 21
+        let defaultPort: Int = baseURL.scheme == "ftps" ? 990 : 21
+        urlComponents.port = urlComponents.port ?? defaultPort
        urlComponents.scheme = urlComponents.scheme ?? "ftp"
        
-        self.baseURL = urlComponents.url!
+        self.baseURL =  (urlComponents.url!.path.hasSuffix("/") ? urlComponents.url! : urlComponents.url!.appendingPathComponent("")).absoluteURL
+        self.passiveMode = passive
        self.currentPath = ""
        self.useCache = false
        self.validatingCache = true
        self.cache = cache
        self.credential = credential
        
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: [])
+        #if swift(>=3.1)
+        let queueLabel = "FileProvider.\(Swift.type(of: self).type)"
+        #else
+        let queueLabel = "FileProvider.\(type(of: self).type)"
+        #endif
+        dispatch_queue = DispatchQueue(label: queueLabel, attributes: .concurrent)
        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
+        operation_queue.name = "\(queueLabel).Operation"
    }
    
    public required convenience init?(coder aDecoder: NSCoder) {
        guard let baseURL = aDecoder.decodeObject(forKey: "baseURL") as? URL else { return nil }
-        self.init(baseURL: baseURL, credential: aDecoder.decodeObject(forKey: "credential") as? URLCredential)
+        self.init(baseURL: baseURL, passive: aDecoder.decodeBool(forKey: "passiveMode"), credential: aDecoder.decodeObject(forKey: "credential") as? URLCredential)
        self.currentPath     = aDecoder.decodeObject(forKey: "currentPath") as? String ?? ""
        self.useCache        = aDecoder.decodeBool(forKey: "useCache")
        self.validatingCache = aDecoder.decodeBool(forKey: "validatingCache")
@@ -110,6 +120,7 @@ open class FTPFileProvider: FileProviderBasicRemote {
        aCoder.encode(self.useCache, forKey: "useCache")
        aCoder.encode(self.validatingCache, forKey: "validatingCache")
        aCoder.encode(self.useAppleImplementation, forKey: "useAppleImplementation")
+        aCoder.encode(self.passiveMode, forKey: "passiveMode")
    }
    
    public static var supportsSecureCoding: Bool {
@@ -139,8 +150,10 @@ open class FTPFileProvider: FileProviderBasicRemote {
        }
    }
    
-    public func contentsOfDirectory(path: String, completionHandler: @escaping (([FileObject], Error?) -> Void)) {
-        self.contentsOfDirectory(path: path, rfc3659enabled: true, completionHandler: completionHandler)
+    internal var serverSupportsRFC3659: Bool = true
+    
+    open func contentsOfDirectory(path: String, completionHandler: @escaping (([FileObject], Error?) -> Void)) {
+        self.contentsOfDirectory(path: path, rfc3659enabled: serverSupportsRFC3659, completionHandler: completionHandler)
    }
    
    /**
@@ -154,7 +167,6 @@ open class FTPFileProvider: FileProviderBasicRemote {
         `contents`: An array of `FileObject` identifying the the directory entries.
         `error`: Error returned by system.
     */
-    
    open func contentsOfDirectory(path apath: String, rfc3659enabled: Bool , completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
        let path = ftpPath(apath)
        
@@ -172,6 +184,11 @@ open class FTPFileProvider: FileProviderBasicRemote {
                    self.ftpQuit(task)
                }
                if let error = error {
+                    if ((error as NSError).domain == URLError.errorDomain && (error as NSError).code == URLError.unsupportedURL.rawValue) {
+                        self.contentsOfDirectory(path: path, rfc3659enabled: false, completionHandler: completionHandler)
+                        return
+                    }
+                    
                    self.dispatch_queue.async {
                        completionHandler([], error)
                    }
@@ -190,8 +207,8 @@ open class FTPFileProvider: FileProviderBasicRemote {
        }
    }
    
-    public func attributesOfItem(path: String, completionHandler: @escaping ((FileObject?, Error?) -> Void)) {
-        self.attributesOfItem(path: path, rfc3659enabled: true, completionHandler: completionHandler)
+    open func attributesOfItem(path: String, completionHandler: @escaping ((FileObject?, Error?) -> Void)) {
+        self.attributesOfItem(path: path, rfc3659enabled: serverSupportsRFC3659, completionHandler: completionHandler)
    }
    
    /**
@@ -230,22 +247,21 @@ open class FTPFileProvider: FileProviderBasicRemote {
                }
                
                guard let response = response, response.hasPrefix("250") || (response.hasPrefix("50") && rfc3659enabled) else {
-                    let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
                    self.dispatch_queue.async {
-                        completionHandler(nil, error)
+                        completionHandler(nil, self.throwError(path, code: URLError.badServerResponse))
                    }
                    return
                }
                
                if response.hasPrefix("500") {
+                    self.serverSupportsRFC3659 = false
                    self.attributesOfItem(path: path, rfc3659enabled: false, completionHandler: completionHandler)
                }
                
                let lines = response.components(separatedBy: "\n").flatMap { $0.isEmpty ? nil : $0.trimmingCharacters(in: .whitespacesAndNewlines) }
                guard lines.count > 2 else {
-                    let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
                    self.dispatch_queue.async {
-                        completionHandler(nil, error)
+                        completionHandler(nil, self.throwError(path, code: URLError.badServerResponse))
                    }
                    return
                }
@@ -263,8 +279,25 @@ open class FTPFileProvider: FileProviderBasicRemote {
        }
    }
    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
-        NotImplemented()
+    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
+        let progress = Progress(parent: nil, userInfo: nil)
+        _ = self.recursiveList(path: path, useMLST: true, foundItemsHandler: { items in
+            if let foundItemHandler = foundItemHandler {
+                for item in items where query.evaluate(with: item.mapPredicate()) {
+                    foundItemHandler(item)
+                }
+                progress.totalUnitCount = Int64(items.count)
+            }
+        }, completionHandler: {files, error in
+            if let error = error {
+                completionHandler([], error)
+                return
+            }
+            
+            let foundFiles = files.filter { query.evaluate(with: $0.mapPredicate()) }
+            completionHandler(foundFiles, nil)
+        })
+        return progress
    }
    
    public func url(of path: String?) -> URL {
@@ -273,7 +306,21 @@ open class FTPFileProvider: FileProviderBasicRemote {
        var baseUrlComponent = URLComponents(url: self.baseURL!, resolvingAgainstBaseURL: true)
        baseUrlComponent?.user = credential?.user
        baseUrlComponent?.password = credential?.password
-        return URL(string: path, relativeTo: baseURL) ?? baseURL!
+        return URL(string: path, relativeTo: baseUrlComponent?.url ?? baseURL) ?? baseUrlComponent?.url ?? baseURL!
+    }
+    
+    public func relativePathOf(url: URL) -> String {
+        // check if url derieved from current base url
+        let relativePath = url.relativePath
+        if !relativePath.isEmpty, url.baseURL == self.baseURL {
+            return (relativePath.removingPercentEncoding ?? relativePath).replacingOccurrences(of: "/", with: "", options: .anchored)
+        }
+        
+        if !relativePath.isEmpty, self.baseURL == self.url(of: "/") {
+            return (relativePath.removingPercentEncoding ?? relativePath).replacingOccurrences(of: "/", with: "", options: .anchored)
+        }
+        
+        return relativePath.replacingOccurrences(of: "/", with: "", options: .anchored)
    }
    
    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
@@ -286,28 +333,28 @@ open class FTPFileProvider: FileProviderBasicRemote {
 }

 extension FTPFileProvider: FileProviderOperations {
-    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        let path = (atPath as NSString).appendingPathComponent(folderName) + "/"
        return doOperation(.create(path: path), completionHandler: completionHandler)
    }
    
-    open func moveItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func moveItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        return doOperation(.move(source: path, destination: toPath), completionHandler: completionHandler)
    }
    
-    open func copyItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        return doOperation(.copy(source: path, destination: toPath), completionHandler: completionHandler)
    }
    
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        return doOperation(.remove(path: path), completionHandler: completionHandler)
    }
    
-    fileprivate func doOperation(_ opType: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    fileprivate func doOperation(_ opType: FileOperationType, completionHandler: SimpleCompletionHandler) -> Progress? {
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
-        guard let sourcePath = opType.source else { return nil }
+        let sourcePath = opType.source
        let destPath = opType.destination
        
        let command: String
@@ -325,7 +372,10 @@ extension FTPFileProvider: FileProviderOperations {
        default: // modify, fetch
            return nil
        }
-        let operationHandle = RemoteOperationHandle(operationType: opType, tasks: [])
+        let progress = Progress(totalUnitCount: 1)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
        
        let task = session.fpstreamTask(withHostName: baseURL!.host!, port: baseURL!.port!)
        self.ftpLogin(task) { (error) in
@@ -347,10 +397,9 @@ extension FTPFileProvider: FileProviderOperations {
                }
                
                guard let response = response else {
-                    let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
                    self.dispatch_queue.async {
                        completionHandler?(error)
-                        self.delegateNotify(opType, error: error)
+                        self.delegateNotify(opType, error: self.throwError(sourcePath, code: URLError.badServerResponse))
                    }
                    return
                }
@@ -369,47 +418,50 @@ extension FTPFileProvider: FileProviderOperations {
                    case .modify:
                        errorCode = URLError.cannotWriteToFile
                    case .copy:
-                        let opHandle = self.fallbackCopy(opType, completionHandler: completionHandler) as? RemoteOperationHandle
-                        operationHandle.tasks = opHandle?.tasks ?? []
+                        self.fallbackCopy(opType, progress: progress, completionHandler: completionHandler)
                        return
                    case .move:
                        errorCode = URLError.cannotMoveFile
                    case .remove:
-                        self.fallbackRemove(opType, on: task, completionHandler: completionHandler)
+                        self.fallbackRemove(opType, progress: progress, on: task, completionHandler: completionHandler)
                        return
                    case .link:
                        errorCode = URLError.cannotWriteToFile
                    default:
                        errorCode = URLError.cannotOpenFile
                    }
-                    let escapedPath = sourcePath.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? sourcePath
-                    let url = NSURL(string: escapedPath, relativeTo: self.baseURL) ?? self.baseURL! as NSURL
-                    let error = NSError(domain: URLError.errorDomain, code: errorCode.rawValue, userInfo: [NSURLErrorFailingURLErrorKey: url])
+                    let error = self.throwError(sourcePath, code: errorCode)
+                    progress.cancel()
                    self.dispatch_queue.async {
                        completionHandler?(error)
-                        self.delegateNotify(opType, error: error)
                    }
+                    self.delegateNotify(opType, error: error)
                    return
                }
                
+                progress.completedUnitCount = progress.totalUnitCount
                self.dispatch_queue.async {
                    completionHandler?(nil)
-                    self.delegateNotify(opType, error: nil)
                }
+                self.delegateNotify(opType, error: nil)
            })
        }
        
-        operationHandle.add(task: task)
-        return operationHandle
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+        return progress
    }
    
-    private func fallbackCopy(_ opType: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard let sourcePath = opType.source else { return nil }
-        guard let destPath = opType.destination else { return nil }
+    private func fallbackCopy(_ opType: FileOperationType, progress: Progress, completionHandler: SimpleCompletionHandler) {
+        let sourcePath = opType.source
+        guard let destPath = opType.destination else { return }
        
        let localURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(UUID().uuidString).appendingPathExtension("tmp")
-        let operationHandle = RemoteOperationHandle(operationType: opType, tasks: [])
-        let firstOp = self.copyItem(path: sourcePath, toLocalURL: localURL, completionHandler: { (error) in
+        
+        progress.becomeCurrent(withPendingUnitCount: 1)
+        _ = self.copyItem(path: sourcePath, toLocalURL: localURL) { (error) in
            if let error = error {
                self.dispatch_queue.async {
                    completionHandler?(error)
@@ -418,61 +470,108 @@ extension FTPFileProvider: FileProviderOperations {
                return
            }
            
-            let secondOp = self.copyItem(localFile: localURL, to: destPath, completionHandler: completionHandler) as? RemoteOperationHandle
-            operationHandle.tasks = secondOp?.tasks ?? []
-        }) as? RemoteOperationHandle
-        operationHandle.tasks = firstOp?.tasks ?? []
-        return operationHandle
+            progress.becomeCurrent(withPendingUnitCount: 1)
+            _ = self.copyItem(localFile: localURL, to: destPath) { error in
+                completionHandler?(nil)
+                self.delegateNotify(opType, error: nil)
+            }
+            progress.resignCurrent()
+        }
+        progress.resignCurrent()
+        return
    }
    
-    private func fallbackRemove(_ opType: FileOperationType, on task: FileProviderStreamTask, recursive: Bool = false, completionHandler: SimpleCompletionHandler) {
-        guard let sourcePath = opType.source else { return }
+    private func fallbackRemove(_ opType: FileOperationType, progress: Progress, on task: FileProviderStreamTask, completionHandler: SimpleCompletionHandler) {
+        let sourcePath = opType.source
        
-        switch recursive {
-        case true:
-            NotImplemented()
-        case false:
-            self.execute(command: "SITE RMDIR \(ftpPath(sourcePath))", on: task) { (response, error) in
-                if let error = error {
-                    self.dispatch_queue.async {
-                        completionHandler?(error)
-                        self.delegateNotify(opType, error: error)
-                    }
-                    return
+        self.execute(command: "SITE RMDIR \(ftpPath(sourcePath))", on: task) { (response, error) in
+            if let error = error {
+                progress.cancel()
+                self.dispatch_queue.async {
+                    completionHandler?(error)
                }
-                
-                guard let response = response else {
-                    let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                    self.dispatch_queue.async {
-                        completionHandler?(error)
-                        self.delegateNotify(opType, error: error)
-                    }
-                    return
+                self.delegateNotify(opType, error: error)
+                return
+            }
+            
+            guard let response = response else {
+                progress.cancel()
+                let error = self.throwError(sourcePath, code: URLError.badServerResponse)
+                self.dispatch_queue.async {
+                    completionHandler?(error)
                }
-                
-                if response.hasPrefix("50") {
-                    self.fallbackRemove(opType, on: task, recursive: true, completionHandler: completionHandler)
-                    return
-                }
-                
-                let escapedPath = sourcePath.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? sourcePath
-                let url = NSURL(string: escapedPath, relativeTo: self.baseURL) ?? self.baseURL! as NSURL
-                let error = NSError(domain: URLError.errorDomain, code: URLError.cannotRemoveFile.rawValue, userInfo: [NSURLErrorFailingURLErrorKey: url])
+                self.delegateNotify(opType, error: error)
+                return
+            }
+            
+            if response.hasPrefix("50") {
+                self.fallbackRecursiveRemove(opType, progress: progress, on: task, completionHandler: completionHandler)
+                return
+            }
+            
+            var error: Error?
+            if !response.hasPrefix("2") {
+                error = self.throwError(sourcePath, code: URLError.cannotRemoveFile)
+            }
+            self.dispatch_queue.async {
+                completionHandler?(error)
+            }
+            self.delegateNotify(opType, error: error)
+        }
+    }
+    
+    private func fallbackRecursiveRemove(_ opType: FileOperationType, progress: Progress, on task: FileProviderStreamTask, completionHandler: SimpleCompletionHandler) {
+        let sourcePath = opType.source
+        
+        _ = self.recursiveList(path: sourcePath, useMLST: true, completionHandler: { (contents, error) in
+            if let error = error {
                self.dispatch_queue.async {
                    completionHandler?(error)
                    self.delegateNotify(opType, error: error)
                }
+                return
            }
-        }
-        return
+            
+            let recursiveProgress = Progress(parent: progress, userInfo: nil)
+            recursiveProgress.totalUnitCount = Int64(contents.count)
+            let sortedContents = contents.sorted(by: {
+                $0.path.localizedStandardCompare($1.path) == .orderedDescending
+            })
+            var command = ""
+            for file in sortedContents {
+                command += (file.isDirectory ? "RMD \(self.ftpPath(file.path))" : "DELE \(self.ftpPath(file.path))") + "\r\n"
+            }
+            command += "RMD \(self.ftpPath(sourcePath))"
+            
+            self.execute(command: command, on: task, completionHandler: { (response, error) in
+                recursiveProgress.completedUnitCount += 1
+                self.dispatch_queue.async {
+                    completionHandler?(error)
+                    self.delegateNotify(opType, error: error)
+                }
+                // TODO: Digest response
+            })
+        })
    }
    
-    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
+        // check file is not a folder
+        guard (try? localFile.resourceValues(forKeys: [.fileResourceTypeKey]))?.fileResourceType ?? .unknown == .regular else {
+            dispatch_queue.async {
+                completionHandler?(self.throwError(localFile.path, code: URLError.fileIsDirectory))
+            }
+            return nil
+        }
+        
        let opType = FileOperationType.copy(source: localFile.absoluteString, destination: toPath)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
-        let operation = RemoteOperationHandle(operationType: opType, tasks: [])
+        
+        let progress = Progress(totalUnitCount: 0)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
        
        let task = session.fpstreamTask(withHostName: baseURL!.host!, port: baseURL!.port!)
        self.ftpLogin(task) { (error) in
@@ -484,10 +583,21 @@ extension FTPFileProvider: FileProviderOperations {
                return
            }
            
-            self.ftpStore(task, filePath: self.ftpPath(toPath), fromData: nil, fromFile: localFile, onTask: {
-                operation.add(task: $0)
-                $0.taskDescription = opType.json
+            self.ftpStore(task, filePath: self.ftpPath(toPath), fromData: nil, fromFile: localFile, onTask: { task in
+                weak var weakTask = task
+                progress.cancellationHandler = {
+                    weakTask?.cancel()
+                }
+                progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+            }, onProgress: { bytesSent, totalSent, expectedBytes in
+                progress.completedUnitCount = totalSent
+                DispatchQueue.main.async {
+                    self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(progress.fractionCompleted))
+                }
            }, completionHandler: { (error) in
+                if error != nil {
+                    progress.cancel()
+                }
                self.ftpQuit(task)
                self.dispatch_queue.async {
                    completionHandler?(error)
@@ -496,30 +606,59 @@ extension FTPFileProvider: FileProviderOperations {
            })
        }
        
-        return operation
+        return progress
    }
    
-    open func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.copy(source: path, destination: destURL.absoluteString)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
-        let operation = RemoteOperationHandle(operationType: opType, tasks: [])
+        var progress = Progress(totalUnitCount: 0)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
        
        if self.useAppleImplementation {
-            let task = session.downloadTask(with: url(of: path))
-            completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = completionHandler
-            downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
-                do {
-                    try FileManager.default.moveItem(at: tempURL, to: destURL)
-                    completionHandler?(nil)
-                } catch let e {
-                    completionHandler?(e)
+            self.attributesOfItem(path: path, completionHandler: { (file, error) in
+                if let error = error {
+                    self.dispatch_queue.async {
+                        completionHandler?(error)
+                        self.delegateNotify(opType, error: error)
+                    }
+                    return
                }
-            }
-            operation.add(task: task)
-            task.taskDescription = opType.json
-            task.resume()
+                
+                if file?.isDirectory ?? false {
+                    self.dispatch_queue.async {
+                        let error = self.throwError(path, code: URLError.fileIsDirectory)
+                        completionHandler?(error)
+                        self.delegateNotify(opType, error: error)
+                    }
+                    return
+                }
+                
+                progress.totalUnitCount = file?.size ?? 0
+                
+                let task = self.session.downloadTask(with: self.url(of: path))
+                completionHandlersForTasks[self.session.sessionDescription!]?[task.taskIdentifier] = completionHandler
+                downloadCompletionHandlersForTasks[self.session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
+                    do {
+                        try FileManager.default.moveItem(at: tempURL, to: destURL)
+                        completionHandler?(nil)
+                    } catch let e {
+                        completionHandler?(e)
+                    }
+                }
+                task.taskDescription = opType.json
+                task.addObserver(self.sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesReceived), options: .new, context: &progress)
+                task.addObserver(self.sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesExpectedToReceive), options: .new, context: &progress)
+                progress.cancellationHandler = { [weak task] in
+                    task?.cancel()
+                }
+                progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+                task.resume()
+            })
        } else {
            let task = session.fpstreamTask(withHostName: baseURL!.host!, port: baseURL!.port!)
            self.ftpLogin(task) { (error) in
@@ -530,14 +669,21 @@ extension FTPFileProvider: FileProviderOperations {
                    return
                }
                
-                self.ftpRetrieveFile(task, filePath: self.ftpPath(path), onTask: {
-                    operation.add(task: $0)
-                    $0.taskDescription = opType.json
+                self.ftpRetrieveFile(task, filePath: self.ftpPath(path), onTask: { task in
+                    weak var weakTask = task
+                    progress.cancellationHandler = {
+                        weakTask?.cancel()
+                    }
+                    progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
                }, onProgress: { recevied, totalReceived, totalSize in
-                    let progress = Double(totalReceived) / Double(totalSize)
-                    self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(progress))
+                    progress.totalUnitCount = totalSize
+                    progress.completedUnitCount = totalReceived
+                    DispatchQueue.main.async {
+                        self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(progress.fractionCompleted))
+                    }
                }) { (tmpurl, error) in
                    if let error = error {
+                        progress.cancel()
                        self.dispatch_queue.async {
                            completionHandler?(error)
                            self.delegateNotify(opType, error: error)
@@ -555,20 +701,28 @@ extension FTPFileProvider: FileProviderOperations {
                }
            }
        }
-        return operation
+        return progress
    }
 }

 extension FTPFileProvider: FileProviderReadWrite {
-    public func contents(path: String, completionHandler: @escaping ((Data?, Error?) -> Void)) -> OperationHandle? {
+    open func contents(path: String, completionHandler: @escaping ((Data?, Error?) -> Void)) -> Progress? {
        let opType = FileOperationType.fetch(path: path)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
        
        if self.useAppleImplementation {
+            var progress = Progress(totalUnitCount: 0)
+            progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+            progress.kind = .file
+            progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+            
            let task = session.downloadTask(with: url(of: path))
            completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
+                if error != nil {
+                    progress.cancel()
+                }
                completionHandler(nil, error)
            }
            downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
@@ -580,14 +734,20 @@ extension FTPFileProvider: FileProviderReadWrite {
                }
            }
            task.taskDescription = opType.json
+            task.addObserver(sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesReceived), options: .new, context: &progress)
+            task.addObserver(sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesExpectedToReceive), options: .new, context: &progress)
+            progress.cancellationHandler = { [weak task] in
+                task?.cancel()
+            }
+            progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
            task.resume()
-            return RemoteOperationHandle(operationType: opType, tasks: [task])
+            return progress
        } else {
            return self.contents(path: path, offset: 0, length: -1, completionHandler: completionHandler)
        }
    }
    
-    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
+    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
        let opType = FileOperationType.fetch(path: path)
        if length == 0 || offset < 0 {
            dispatch_queue.async {
@@ -596,7 +756,10 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
            return nil
        }
-        let operation = RemoteOperationHandle(operationType: opType, tasks: [])
+        let progress = Progress(totalUnitCount: 0)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
        
        let task = session.fpstreamTask(withHostName: baseURL!.host!, port: baseURL!.port!)
        self.ftpLogin(task) { (error) in
@@ -607,14 +770,21 @@ extension FTPFileProvider: FileProviderReadWrite {
                return
            }
            
-            self.ftpRetrieveData(task, filePath: self.ftpPath(path), from: offset, length: length, onTask: {
-                operation.add(task: $0)
-                $0.taskDescription = opType.json
+            self.ftpRetrieveData(task, filePath: self.ftpPath(path), from: offset, length: length, onTask: { task in
+                weak var weakTask = task
+                progress.cancellationHandler = {
+                    weakTask?.cancel()
+                }
+                progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
            }, onProgress: { recevied, totalReceived, totalSize in
-                let progress = Double(totalReceived) / Double(totalSize)
-                self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(progress))
+                progress.totalUnitCount = totalSize
+                progress.completedUnitCount = totalReceived
+                DispatchQueue.main.async {
+                    self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(progress.fractionCompleted))
+                }
            }) { (data, error) in
                if let error = error {
+                    progress.cancel()
                    self.dispatch_queue.async {
                        completionHandler(nil, error)
                        self.delegateNotify(opType, error: error)
@@ -631,16 +801,20 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
        }
        
-        return operation
+        return progress
    }
    
-    public func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.modify(path: path)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
        
-        let operation = RemoteOperationHandle(operationType: opType, tasks: [])
+        let progress = Progress(totalUnitCount: Int64(data?.count ?? 0))
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        let task = session.fpstreamTask(withHostName: baseURL!.host!, port: baseURL!.port!)
        self.ftpLogin(task) { (error) in
            if let error = error {
@@ -652,10 +826,21 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
            
            let storeHandler = {
-                self.ftpStore(task, filePath: self.ftpPath(path), fromData: data ?? Data(), fromFile: nil, onTask: {
-                    operation.add(task: $0)
-                    $0.taskDescription = opType.json
+                self.ftpStore(task, filePath: self.ftpPath(path), fromData: data ?? Data(), fromFile: nil, onTask: { task in
+                    weak var weakTask = task
+                    progress.cancellationHandler = {
+                        weakTask?.cancel()
+                    }
+                    progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+                }, onProgress: { bytesSent, totalSent, expectedBytes in
+                    progress.completedUnitCount = totalSent
+                    DispatchQueue.main.async {
+                        self.delegate?.fileproviderProgress(self, operation: opType, progress: Float(progress.fractionCompleted))
+                    }
                }, completionHandler: { (error) in
+                    if error != nil {
+                        progress.cancel()
+                    }
                    self.ftpQuit(task)
                    self.dispatch_queue.async {
                        completionHandler?(error)
@@ -675,11 +860,11 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
        }
        
-        return operation
+        return progress
    }
 }

-extension FTPFileProvider {
+public extension FTPFileProvider {
    /**
     Creates a symbolic link at the specified path that points to an item at the given path.
     This method does not traverse symbolic links contained in destination path, making it possible
@@ -8,9 +8,7 @@

 import Foundation

-extension FTPFileProvider {
-    private static let carriage = "\r\n"
-    
+internal extension FTPFileProvider {
    func delegateNotify(_ operation: FileOperationType, error: Error?) {
        DispatchQueue.main.async(execute: {
            if error == nil {
@@ -48,7 +46,7 @@ extension FTPFileProvider {
    
    func execute(command: String, on task: FileProviderStreamTask, minLength: Int = 4, afterSend: ((_ error: Error?) -> Void)? = nil, completionHandler: @escaping (_ response: String?, _ error: Error?) -> Void) {
        let timeout = session.configuration.timeoutIntervalForRequest
-        let terminalcommand = command + FTPFileProvider.carriage
+        let terminalcommand = command + "\r\n"
        task.write(terminalcommand.data(using: .utf8)!, timeout: timeout) { (error) in
            if let error = error {
                completionHandler(nil, error)
@@ -67,10 +65,9 @@ extension FTPFileProvider {
                }
                
                if let data = data, let response = String(data: data, encoding: .utf8) {
-                    completionHandler(response.trimmingCharacters(in: CharacterSet(charactersIn: FTPFileProvider.carriage)), nil)
+                    completionHandler(response.trimmingCharacters(in: .whitespacesAndNewlines), nil)
                } else {
-                    let badResponseError = NSError(domain: URLError.errorDomain, code: URLError.cannotParseResponse.rawValue, userInfo: nil)
-                    completionHandler(nil, badResponseError)
+                    completionHandler(nil, self.throwError("", code: URLError.cannotParseResponse))
                    return
                }
            }
@@ -83,6 +80,13 @@ extension FTPFileProvider {
            task.resume()
        }
        
+        var isSecure = false
+        // Implicit FTP Connection
+        if self.baseURL?.port == 990 || self.baseURL?.scheme == "ftps" {
+            task.startSecureConnection()
+            isSecure = true
+        }
+        
        let credential = self.credential
        
        task.readData(ofMinLength: 4, maxLength: 2048, timeout: timeout) { (data, eof, error) in
@@ -92,21 +96,17 @@ extension FTPFileProvider {
            }
            
            guard let data = data, let response = String(data: data, encoding: .utf8) else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.cannotParseResponse.rawValue, userInfo: nil)
-                completionHandler(error)
+                completionHandler(self.throwError("", code: URLError.cannotParseResponse))
                return
            }
            
            guard response.hasPrefix("22") else {
-                let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                let error = FileProviderFTPError(message: response)
                completionHandler(error)
                return
            }
            
-            let loginHandle = {
+            let loginHandle: () -> Void = {
                self.execute(command: "USER \(credential?.user ?? "anonymous")", on: task) { (response, error) in
                    if let error = error {
                        completionHandler(error)
@@ -114,8 +114,7 @@ extension FTPFileProvider {
                    }
                    
                    guard let response = response else {
-                        let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                        completionHandler(error)
+                        completionHandler(self.throwError("", code: URLError.badServerResponse))
                        return
                    }
                    
@@ -126,30 +125,51 @@ extension FTPFileProvider {
                    }
                    
                    // needs password
-                    if response.hasPrefix("33") {
+                    if FileProviderFTPError(message: response).code == 331 {
                        self.execute(command: "PASS \(credential?.password ?? "fileprovider@")", on: task) { (response, error) in
-                            if response?.hasPrefix("2") ?? false {
+                            if response?.hasPrefix("23") ?? false {
                                completionHandler(nil)
                            } else {
-                                let error = NSError(domain: URLError.errorDomain, code: URLError.userAuthenticationRequired.rawValue, userInfo: nil)
-                                completionHandler(error)
+                                completionHandler(self.throwError("", code: URLError.userAuthenticationRequired))
                            }
                        }
                        return
                    }
                    
-                    let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                    let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                    let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                    let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                    let error = FileProviderFTPError(message: response)
                    completionHandler(error)
                    return
                }
            }
            
-            if self.baseURL?.scheme == "ftps" || self.baseURL?.port == 990 {
+            if !isSecure && self.baseURL?.scheme == "ftpes" {
+                // Explicit FTP Connection, by upgrading connection to FTP/SSL
                self.execute(command: "AUTH TLS", on: task, minLength: 0, completionHandler: { (response, error) in
-                    task.startSecureConnection()
+                    if let error = error {
+                        completionHandler(error)
+                        return
+                    }
+                    
+                    if let response = response, response.hasPrefix("23") {
+                        task.startSecureConnection()
+                        isSecure = true
+                        self.execute(command: "PBSZ 0\r\nPROT P", on: task, completionHandler: { (response, error) in
+                            if let error = error {
+                                completionHandler(error)
+                                return
+                            }
+                            
+                            loginHandle()
+                        })
+                    }
+                })
+            } else if isSecure {
+                self.execute(command: "PBSZ 0\r\nPROT P", on: task, completionHandler: { (response, error) in
+                    if let error = error {
+                        completionHandler(error)
+                        return
+                    }
+                    
                    loginHandle()
                })
            } else {
@@ -166,8 +186,7 @@ extension FTPFileProvider {
            }
            
            guard let response = response else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                completionHandler(error)
+                completionHandler(self.throwError(path, code: URLError.badServerResponse))
                return
            }
            
@@ -177,10 +196,7 @@ extension FTPFileProvider {
            }
            // not logged in
            else if response.hasPrefix("55") {
-                let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                let error = FileProviderFTPError(message: response)
                completionHandler(error)
                return
            }
@@ -199,16 +215,14 @@ extension FTPFileProvider {
                return
            }
            
-            guard let response = response, let destString = response.components(separatedBy: " ").flatMap({ $0 }).last else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                completionHandler(nil, error)
+            guard let response = response, let destString = response.components(separatedBy: " ").flatMap({ $0 }).last.flatMap({ String($0) }) else {
+                completionHandler(nil, self.throwError("", code: URLError.badServerResponse))
                return
            }
            
            let destArray = destString.components(separatedBy: ",").flatMap({ UInt32(trimmedNumber($0)) })
            guard destArray.count == 6 else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                completionHandler(nil, error)
+                completionHandler(nil, self.throwError("", code: URLError.badServerResponse))
                return
            }
            
@@ -222,39 +236,45 @@ extension FTPFileProvider {
            
            let passiveTask = self.session.fpstreamTask(withHostName: host, port: port)
            passiveTask.resume()
-            if self.baseURL?.scheme == "ftps" || self.baseURL?.port == 990 {
-                task.startSecureConnection()
+            if self.baseURL?.scheme == "ftps" || self.baseURL?.scheme == "ftpes" || self.baseURL?.port == 990 {
+                passiveTask.startSecureConnection()
            }
            completionHandler(passiveTask, nil)
        }
    }
    
    func ftpActive(_ task: FileProviderStreamTask, completionHandler: @escaping (_ dataTask: FileProviderStreamTask?, _ error: Error?) -> Void) {
-        NotImplemented()
-        let port = 0
-        self.execute(command: "PORT \(port)", on: task) { (response, error) in
+        let service = NetService(domain: "", type: "_tcp.", name: "", port: 0)
+        service.publish(options: .listenForConnections)
+        let startTime = Date()
+        while service.port < 1 && startTime.timeIntervalSinceNow > -self.session.configuration.timeoutIntervalForRequest {
+            usleep(100_000)
+        }
+        let activeTask = self.session.fpstreamTask(withNetService: service)
+        activeTask.resume()
+        if self.baseURL?.scheme == "ftps" || self.baseURL?.port == 990 {
+            activeTask.startSecureConnection()
+        }
+        
+        self.execute(command: "PORT \(service.port)", on: task) { (response, error) in
            if let error = error {
+                activeTask.cancel()
                completionHandler(nil, error)
                return
            }
            
            guard let response = response else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                completionHandler(nil, error)
+                activeTask.cancel()
+                completionHandler(nil, self.throwError("", code: URLError.badServerResponse))
                return
            }
            
            guard !response.hasPrefix("5") else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.cannotConnectToHost.rawValue, userInfo: nil)
-                completionHandler(nil, error)
+                activeTask.cancel()
+                completionHandler(nil, self.throwError("", code: URLError.cannotConnectToHost))
                return
            }
            
-            let activeTask = self.session.fpstreamTask(withHostName: self.baseURL!.host!, port: 20)
-            activeTask.resume()
-            if self.baseURL?.scheme == "ftps" || self.baseURL?.port == 990 {
-                task.startSecureConnection()
-            }
            completionHandler(activeTask, nil)
        }
    }
@@ -263,7 +283,9 @@ extension FTPFileProvider {
        if self.passiveMode {
            self.ftpPassive(task, completionHandler: completionHandler)
        } else {
-            self.ftpActive(task, completionHandler: completionHandler)
+            dispatch_queue.async {
+                self.ftpActive(task, completionHandler: completionHandler)
+            }
        }
    }
    
@@ -275,13 +297,15 @@ extension FTPFileProvider {
            }
            
            // Successful
-            if response?.hasPrefix("35") ?? false {
+            guard let response = response else {
+                completionHandler(self.throwError("", code: URLError.badServerResponse))
+                return
+            }
+            
+            if response.hasPrefix("35") {
                completionHandler(nil)
            } else {
-                let spaceIndex = response?.characters.index(of: "-") ?? response?.startIndex
-                let code = Int((response?.substring(to: spaceIndex!).trimmingCharacters(in: .whitespacesAndNewlines))!) ?? -1
-                let description = response?.substring(from: spaceIndex!).trimmingCharacters(in: .whitespacesAndNewlines)
-                let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                let error = FileProviderFTPError(message: response, path: "")
                completionHandler(error)
                return
            }
@@ -296,13 +320,13 @@ extension FTPFileProvider {
            }
            
            guard let dataTask = dataTask else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                completionHandler([], error)
+                completionHandler([], self.throwError(path, code: URLError.badServerResponse))
                return
            }
            
+            var success = false
            let command = useMLST ? "MLSD \(path)" : "LIST \(path)"
-            self.execute(command: command, on: task, minLength: 70, afterSend: { error in
+            self.execute(command: command, on: task, minLength: 20, afterSend: { error in
                // starting passive task
                let timeout = self.session.configuration.timeoutIntervalForRequest
                
@@ -313,7 +337,7 @@ extension FTPFileProvider {
                    while !eof {
                        let group = DispatchGroup()
                        group.enter()
-                        dataTask.readData(ofMinLength: 0, maxLength: 65535, timeout: timeout, completionHandler: { (data, seof, serror) in
+                        dataTask.readData(ofMinLength: 1, maxLength: 65535, timeout: timeout, completionHandler: { (data, seof, serror) in
                            if let data = data {
                                finalData.append(data)
                            }
@@ -324,25 +348,25 @@ extension FTPFileProvider {
                        let waitResult = group.wait(timeout: .now() + timeout)
                        
                        if let error = error {
-                            completionHandler([], error)
+                            if !((error as NSError).domain == URLError.errorDomain && (error as NSError).code == URLError.cancelled.rawValue) {
+                                completionHandler([], error)
+                            }
                            return
                        }
                        
                        if waitResult == .timedOut {
-                            error = NSError(domain: URLError.errorDomain, code: URLError.timedOut.rawValue, userInfo: nil)
-                            completionHandler([], error)
+                            completionHandler([], self.throwError(path, code: URLError.timedOut))
                            return
                        }
                    }
                    
                    guard let response = String(data: finalData, encoding: .utf8) else {
-                        error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                        completionHandler([], error)
+                        completionHandler([], self.throwError(path, code: URLError.badServerResponse))
                        return
                    }
                    
-                    let contents = response.components(separatedBy: "\n").flatMap({ $0.trimmingCharacters(in: .whitespacesAndNewlines) })
-                    
+                    let contents: [String] = response.components(separatedBy: "\n").flatMap({ $0.trimmingCharacters(in: .whitespacesAndNewlines) })
+                    success = true
                    completionHandler(contents, nil)
                    return
                }
@@ -353,22 +377,19 @@ extension FTPFileProvider {
                }
                
                guard let response = response else {
-                    let badResponseError = NSError(domain: URLError.errorDomain, code: URLError.cannotParseResponse.rawValue, userInfo: nil)
-                    completionHandler([], badResponseError)
+                    completionHandler([], self.throwError(path, code: URLError.cannotParseResponse))
                    return
                }
                
-                if response.hasPrefix("50") && useMLST {
-                    self.ftpList(task, of: path, useMLST: false, completionHandler: completionHandler)
+                if response.hasPrefix("500") && useMLST {
+                    dataTask.cancel()
+                    self.serverSupportsRFC3659 = false
+                    completionHandler([], self.throwError(path, code: URLError.unsupportedURL))
                    return
                }
                
-                if !response.hasPrefix("25") {
-                    let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                    let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                    let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                    let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
-
+                if !success && !(response.hasPrefix("25") || response.hasPrefix("15")) {
+                    let error = FileProviderFTPError(message: response, path: path)
                    self.dispatch_queue.async {
                        completionHandler([], error)
                    }
@@ -378,8 +399,56 @@ extension FTPFileProvider {
        }
    }
    
-    func ftpRecursiveList(_ task: FileProviderStreamTask, of path: String, useMLST: Bool, completionHandler: @escaping (_ contents: [String], _ error: Error?) -> Void) {
-        // TODO: Implement recursive listing for search and removing function
+    func recursiveList(path: String, useMLST: Bool, foundItemsHandler: ((_ contents: [FileObject]) -> Void)? = nil, completionHandler: @escaping (_ contents: [FileObject], _ error: Error?) -> Void) -> Progress? {
+        let progress = Progress(totalUnitCount: 0)
+        let queue = DispatchQueue(label: "\(self.type).recursiveList")
+        queue.async {
+            let group = DispatchGroup()
+            var result = [FileObject]()
+            var success = true
+            group.enter()
+            self.contentsOfDirectory(path: path, completionHandler: { (files, error) in
+                success = success && (error == nil)
+                if let error = error {
+                    completionHandler([], error)
+                    group.leave()
+                    return
+                }
+                
+                result.append(contentsOf: files)
+                progress.completedUnitCount = Int64(files.count)
+                foundItemsHandler?(files)
+                
+                let directories: [FileObject] = files.filter { $0.isDirectory }
+                progress.becomeCurrent(withPendingUnitCount: Int64(directories.count))
+                for dir in directories {
+                    group.enter()
+                    _=self.recursiveList(path: dir.path, useMLST: useMLST, foundItemsHandler: foundItemsHandler, completionHandler: { (contents, error) in
+                        success = success && (error == nil)
+                        if let error = error {
+                            completionHandler([], error)
+                            group.leave()
+                            return
+                        }
+                        
+                        foundItemsHandler?(files)
+                        result.append(contentsOf: contents)
+                        
+                        group.leave()
+                    })
+                }
+                progress.resignCurrent()
+                group.leave()
+            })
+            group.wait()
+            
+            if success {
+                self.dispatch_queue.async {
+                    completionHandler(result, nil)
+                }
+            }
+        }
+        return progress
    }
    
    func ftpRetrieveData(_ task: FileProviderStreamTask, filePath: String, from position: Int64 = 0, length: Int = -1, onTask: ((_ task: FileProviderStreamTask) -> Void)?, onProgress: ((_ bytesReceived: Int64, _ totalReceived: Int64, _ expectedBytes: Int64) -> Void)?, completionHandler: @escaping (_ data: Data?, _ error: Error?) -> Void) {
@@ -402,13 +471,13 @@ extension FTPFileProvider {
                }
                
                guard let dataTask = dataTask else {
-                    let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                    completionHandler(nil, error)
+                    completionHandler(nil, self.throwError(filePath, code: URLError.badServerResponse))
                    return
                }
                
                // Send retreive command
-                self.execute(command: "TYPE L" + FTPFileProvider.carriage + "REST \(position)" + FTPFileProvider.carriage + "RETR \(filePath)", on: task, minLength: 75, afterSend: { error in
+                let len = 19 /* TYPE response */ + 65 + String(position).characters.count /* REST Response */ + 53 + filePath.characters.count + String(totalSize).characters.count /* RETR open response */ + 26 /* RETR Transfer complete message. */
+                self.execute(command: "TYPE I" + "\r\n" + "REST \(position)" + "\r\n" + "RETR \(filePath)", on: task, minLength: len, afterSend: { error in
                    // starting passive task
                    onTask?(dataTask)
                    
@@ -440,8 +509,7 @@ extension FTPFileProvider {
                            }
                            
                            if waitResult == .timedOut {
-                                error = NSError(domain: URLError.errorDomain, code: URLError.timedOut.rawValue, userInfo: nil)
-                                completionHandler(nil, error)
+                                completionHandler(nil, self.throwError(filePath, code: URLError.timedOut))
                                return
                            }
                        }
@@ -463,16 +531,12 @@ extension FTPFileProvider {
                    }
                    
                    guard let response = response else {
-                        let badResponseError = NSError(domain: URLError.errorDomain, code: URLError.cannotParseResponse.rawValue, userInfo: nil)
-                        completionHandler(nil, badResponseError)
+                        completionHandler(nil, self.throwError(filePath, code: URLError.cannotParseResponse))
                        return
                    }
                    
                    if !(response.hasPrefix("1") || !response.hasPrefix("2")) {
-                        let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                        let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                        let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                        let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                        let error = FileProviderFTPError(message: response)
                        
                        self.dispatch_queue.async {
                            completionHandler(nil, error)
@@ -511,13 +575,13 @@ extension FTPFileProvider {
                }
                
                guard let dataTask = dataTask else {
-                    let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                    completionHandler(nil, error)
+                    completionHandler(nil, self.throwError(filePath, code: URLError.badServerResponse))
                    return
                }
                
                // Send retreive command
-                self.execute(command: "TYPE I"  + FTPFileProvider.carriage + "REST \(position)" + FTPFileProvider.carriage + "RETR \(filePath)", on: task, minLength: 75, afterSend: { error in
+                let len = 19 /* TYPE response */ + 65 + String(position).characters.count /* REST Response */ + 53 + filePath.characters.count + String(totalSize).characters.count /* RETR open response */ + 26 /* RETR Transfer complete message. */
+                self.execute(command: "TYPE I"  + "\r\n" + "REST \(position)" + "\r\n" + "RETR \(filePath)", on: task, minLength: len, afterSend: { error in
                    // starting passive task
                    onTask?(dataTask)
                    
@@ -549,7 +613,7 @@ extension FTPFileProvider {
                            }
                            
                            if waitResult == .timedOut {
-                                error = NSError(domain: URLError.errorDomain, code: URLError.timedOut.rawValue, userInfo: nil)
+                                error = self.throwError("", code: URLError.timedOut)
                                completionHandler(nil, error)
                                return
                            }
@@ -580,16 +644,12 @@ extension FTPFileProvider {
                    }
                    
                    guard let response = response else {
-                        let badResponseError = NSError(domain: URLError.errorDomain, code: URLError.cannotParseResponse.rawValue, userInfo: nil)
-                        completionHandler(nil, badResponseError)
+                        completionHandler(nil, self.throwError(filePath, code: URLError.cannotParseResponse))
                        return
                    }
                    
-                    if !(response.hasPrefix("1") || !response.hasPrefix("2")) {
-                        let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                        let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                        let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                        let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                    if !(response.hasPrefix("1") || response.hasPrefix("2")) {
+                        let error = FileProviderFTPError(message: response)
                        
                        self.dispatch_queue.async {
                            completionHandler(nil, error)
@@ -601,8 +661,71 @@ extension FTPFileProvider {
        }
    }
    
-    func ftpStore(_ task: FileProviderStreamTask, filePath: String, fromData: Data?, fromFile: URL?, onTask: ((_ task: FileProviderStreamTask) -> Void)?, completionHandler: @escaping (_ error: Error?) -> Void) {
-        
+    func ftpStore(_ task: FileProviderStreamTask, filePath: String, fromData: Data?, fromFile: URL?, onTask: ((_ task: FileProviderStreamTask) -> Void)?,  onProgress: ((_ bytesSent: Int64, _ totalSent: Int64, _ expectedBytes: Int64) -> Void)?, completionHandler: @escaping (_ error: Error?) -> Void) {
+        let timeout = self.session.configuration.timeoutIntervalForRequest
+        operation_queue.addOperation {
+            guard let size: Int64 = (fromData != nil ? Int64(fromData!.count) : nil) ?? fromFile?.fileSize else { return }
+            
+            var error: Error?
+            let chunkSize: Int
+            switch size {
+            case 0..<262_144: chunkSize = 32_768 // 0KB To 256KB, page size is 32KB
+            case 262_144..<1_048_576: chunkSize = 65_536 // 256KB To 1MB, page size is 64KB
+            case 1_048_576..<10_485_760: chunkSize = 131_072 // 1MB To 10MB, page size is 128KB
+            case 10_048_576..<33_554_432: chunkSize = 262_144 // 1MB To 10MB, page size is 256KB
+            default: chunkSize = 524_288 // Larger than 32MB, page size is 512KB
+            }
+            
+            var fileHandle: FileHandle?
+            if let file = fromFile {
+                fileHandle = FileHandle(forReadingAtPath: file.path)
+            }
+            defer {
+                fileHandle?.closeFile()
+            }
+            
+            var eof = false
+            var sent: Int64 = 0
+            
+            while !eof {
+                let subdata: Data
+                if let data = fromData {
+                    let endIndex = min(data.count, Int(sent) + chunkSize)
+                    eof = endIndex == data.count
+                    subdata = data.subdata(in: Int(sent)..<endIndex)
+                }else if let fileHandle = fileHandle {
+                    subdata = fileHandle.readData(ofLength: chunkSize)
+                    eof = Int64(fileHandle.offsetInFile) == size
+                } else {
+                    return
+                }
+                if subdata.count == 0 { continue }
+                
+                let group = DispatchGroup()
+                group.enter()
+                self.ftpStore(task, data: subdata, to: filePath, from: sent, onTask: onTask, completionHandler: { (serror) in
+                    error = serror
+                    sent += Int64(subdata.count)
+                    group.leave()
+                    onProgress?(Int64(subdata.count), sent, size)
+                })
+                let waitResult = group.wait(timeout: .now() + timeout)
+                
+                if waitResult == .timedOut {
+                    error = self.throwError(filePath, code: URLError.timedOut)
+                    completionHandler(error)
+                    return
+                }
+                if let error = error {
+                    completionHandler(error)
+                    return
+                }
+            }
+            completionHandler(nil)
+        }
+    }
+    
+    func ftpStore(_ task: FileProviderStreamTask, data: Data, to filePath: String, from position: Int64, onTask: ((_ task: FileProviderStreamTask) -> Void)?, completionHandler: @escaping (_ error: Error?) -> Void) {
        self.ftpDataConnect(task) { (dataTask, error) in
            if let error = error {
                completionHandler(error)
@@ -610,13 +733,14 @@ extension FTPFileProvider {
            }
            
            guard let dataTask = dataTask else {
-                let error = NSError(domain: URLError.errorDomain, code: URLError.badServerResponse.rawValue, userInfo: nil)
-                completionHandler(error)
+                completionHandler(self.throwError(filePath, code: URLError.badServerResponse))
                return
            }
            
            // Send retreive command
-            self.execute(command: "TYPE L"  + FTPFileProvider.carriage + "STOR \(filePath)", on: task, minLength: 75, afterSend: { error in
+            var success = false
+            let len = 19 /* TYPE response */ + 65 + String(position).characters.count /* REST Response */ + 44 + filePath.characters.count /* STOR open response */ + 10 /* RETR Transfer complete message. */
+            self.execute(command: "TYPE I"  + "\r\n" + "REST \(position)"  + "\r\n" + "STOR \(filePath)", on: task, minLength: len, afterSend: { error in
                // starting passive task
                let timeout = self.session.configuration.timeoutIntervalForRequest
                if self.baseURL?.scheme == "ftps" || self.baseURL?.port == 990 {
@@ -624,72 +748,41 @@ extension FTPFileProvider {
                }
                onTask?(dataTask)
                
-                DispatchQueue.global().async {
-                    var error: Error?
-                    
-                    if let data = fromData {
-                        dataTask.write(data, timeout: timeout, completionHandler: { (error) in
-                            completionHandler(error)
-                        })
-                        dataTask.closeWrite()
+                if data.count == 0 { return }
+                
+                dataTask.write(data, timeout: timeout, completionHandler: { (error) in
+                    if let error = error {
+                        completionHandler(error)
                        return
                    }
+                    success = true
                    
-                    guard let file = fromFile, let fileHandle = FileHandle(forReadingAtPath: file.path) else { return }
-                    
-                    
-                    fileHandle.seek(toFileOffset: 0)
-                    var eof = false
-                    while !eof {
-                        let group = DispatchGroup()
-                        group.enter()
-                        let data = fileHandle.readData(ofLength: 65536)
-                        eof = data.count < 65536
-                        dataTask.write(data, timeout: timeout, completionHandler: { (serror) in
-                            error = serror
-                            group.leave()
-                        })
-                        
-                        let waitResult = group.wait(timeout: .now() + timeout)
-                        
-                        if let error = error {
-                            completionHandler(error)
-                            return
-                        }
-                        
-                        if waitResult == .timedOut {
-                            error = NSError(domain: URLError.errorDomain, code: URLError.timedOut.rawValue, userInfo: nil)
-                            completionHandler(error)
-                            return
-                        }
-                    }
+                    dataTask.closeRead()
                    dataTask.closeWrite()
-                    completionHandler(nil)
-                    return
-                }
+                })
            }) { (response, error) in
+                guard success else { return }
+                
                if let error = error {
                    completionHandler(error)
                    return
                }
                
                guard let response = response else {
-                    let badResponseError = NSError(domain: URLError.errorDomain, code: URLError.cannotParseResponse.rawValue, userInfo: nil)
-                    completionHandler(badResponseError)
+                    completionHandler(self.throwError(filePath, code: URLError.cannotParseResponse))
                    return
                }
                
-                if !(response.hasPrefix("1") || !response.hasPrefix("2")) {
-                    let spaceIndex = response.characters.index(of: "-") ?? response.startIndex
-                    let code = Int(response.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
-                    let description = response.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
-                    let error = FileProviderFTPError(code: code, path: "", errorDescription: description)
+                if !(response.hasPrefix("1") || response.hasPrefix("2")) {
+                    let error = FileProviderFTPError(message: response)
                    
                    self.dispatch_queue.async {
                        completionHandler(error)
                    }
                    return
                }
+                
+                completionHandler(nil)
            }
        }
    }
@@ -778,7 +871,8 @@ extension FTPFileProvider {
        guard components.count > 1 else { return nil }
        
        let nameOrPath = components.removeLast().trimmingCharacters(in: .whitespacesAndNewlines)
-        let correctedPath: String, name: String
+        var correctedPath: String
+        let name: String
        if nameOrPath.hasPrefix("/") {
            correctedPath = nameOrPath.replacingOccurrences(of: baseURL!.path, with: "", options: .anchored)
            name = (nameOrPath as NSString).lastPathComponent
@@ -786,6 +880,9 @@ extension FTPFileProvider {
            name = nameOrPath
            correctedPath = (path as NSString).appendingPathComponent(nameOrPath)
        }
+        if correctedPath.hasPrefix("/") {
+            correctedPath.characters.removeFirst()
+        }
        
        var attributes = [String: String]()
        for component in components {
@@ -794,7 +891,7 @@ extension FTPFileProvider {
            attributes[keyValue[0].lowercased()] = keyValue.dropFirst().joined(separator: "=")
        }
        
-        let file = FileObject(url: url(of: path), name: name, path: correctedPath)
+        let file = FileObject(url: url(of: correctedPath), name: name, path: correctedPath)
        let dateFormatter = DateFormatter()
        dateFormatter.calendar = Calendar(identifier: .gregorian)
        dateFormatter.locale = Locale(identifier: "en_US_POSIX")
@@ -847,4 +944,22 @@ public struct FileProviderFTPError: Error {
    public let path: String
    /// Contents returned by server as error description
    public let errorDescription: String?
+    
+    init(code: Int, path: String, errorDescription: String?) {
+        self.code = code
+        self.path = path
+        self.errorDescription = errorDescription
+    }
+    
+    init(message response: String, path: String = "") {
+        let message = response.components(separatedBy: .newlines).last ?? "No Response"
+        let spaceIndex = message.characters.index(of: "-") ?? message.characters.index(of: " ") ?? message.startIndex
+        self.code = Int(message.substring(to: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)) ?? -1
+        self.path = path
+        if code > 0 {
+            self.errorDescription = message.substring(from: spaceIndex).trimmingCharacters(in: .whitespacesAndNewlines)
+        } else {
+            self.errorDescription = message
+        }
+    }
 }
@@ -13,22 +13,29 @@ open class FileObject: Equatable {
    /// A `Dictionary` contains file information,  using `URLResourceKey` keys.
    open internal(set) var allValues: [URLResourceKey: Any]
    
-    internal init(allValues: [URLResourceKey: Any]) {
+    public init(allValues: [URLResourceKey: Any]) {
        self.allValues = allValues
    }
    
-    internal init(url: URL, name: String, path: String) {
+    internal init(url: URL?, name: String, path: String) {
        self.allValues = [URLResourceKey: Any]()
-        self.url = url
+        if let url = url {
+            self.url = url
+        }
        self.name = name
        self.path = path
    }
    
    /// URL to access the resource, can be a relative URL against base URL.
    /// not supported by Dropbox provider.
-    open internal(set) var url: URL? {
+    open internal(set) var url: URL {
        get {
-            return allValues[.fileURLKey] as? URL
+            if let url = allValues[.fileURLKey] as? URL {
+                return url
+            } else {
+                let path = self.path.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? self.path
+                return URL(string: path) ?? URL(string: "/")!
+            }
        }
        set {
            allValues[.fileURLKey] = newValue
@@ -133,13 +140,20 @@ open class FileObject: Equatable {
    
    /// Check `FileObject` equality
    public static func ==(lhs: FileObject, rhs: FileObject) -> Bool {
-        if rhs === lhs {
+        if rhs === lhs  {
            return true
        }
+        #if swift(>=3.1)
+        if Swift.type(of: lhs) != Swift.type(of: rhs) {
+            return false
+        }
+        #else
        if type(of: lhs) != type(of: rhs) {
            return false
        }
-        if let rurl = rhs.url, let lurl = lhs.url {
+        #endif
+        
+        if let rurl = rhs.allValues[.fileURLKey] as? URL, let lurl = lhs.allValues[.fileURLKey] as? URL {
            return rurl == lurl
        }
        return rhs.path == lhs.path && rhs.size == lhs.size && rhs.modifiedDate == lhs.modifiedDate
@@ -19,7 +19,7 @@ public typealias ImageClass = NSImage
 public typealias SimpleCompletionHandler = ((_ error: Error?) -> Void)?

 /// This protocol defines FileProvider neccesary functions and properties to connect and get contents list
-public protocol FileProviderBasic: class, NSCoding, NSSecureCoding {
+public protocol FileProviderBasic: class, NSSecureCoding {
    /// An string to identify type of provider.
    static var type: String { get }
    
@@ -99,7 +99,8 @@ public protocol FileProviderBasic: class, NSCoding, NSSecureCoding {
       - foundItemHandler: Closure which is called when a file is found
       - completionHandler: Closure which will be called after finishing search. Returns an arry of `FileObject` or error if occured.
     */
-    func searchFiles(path: String, recursive: Bool, query: String, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void))
+    @discardableResult
+    func searchFiles(path: String, recursive: Bool, query: String, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress?
    
    /**
     Search files inside directory using query asynchronously.
@@ -121,8 +122,10 @@ public protocol FileProviderBasic: class, NSCoding, NSSecureCoding {
       - query: An `NSPredicate` object with keys like `FileObject` members, except `size` which becomes `filesize`.
       - foundItemHandler: Closure which is called when a file is found
       - completionHandler: Closure which will be called after finishing search. Returns an arry of `FileObject` or error if occured.
+     - Returns: An `Progress` to get progress or cancel progress.
     */
-    func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void))
+    @discardableResult
+    func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress?
    
    /**
     Returns an independent url to access the file. Some providers like `Dropbox` due to their nature.
@@ -132,14 +135,23 @@ public protocol FileProviderBasic: class, NSCoding, NSSecureCoding {
    */
    func url(of path: String?) -> URL
    
+    
+    /// Returns the relative path of url, wothout percent encoding. Even if url is absolute or
+    /// retrieved from another provider, it will try to resolve the url against `baseURL` of
+    /// current provider. It's highly recomended to use this method for displaying purposes.
+    ///
+    /// - Parameter url: Absolute url to file or directory.
+    /// - Returns: A `String` contains relative path of url against base url.
+    func relativePathOf(url: URL) -> String
+    
    /// Checks the connection to server or permission on local
    func isReachable(completionHandler: @escaping(_ success: Bool) -> Void)
 }

 extension FileProviderBasic {
-    public func searchFiles(path: String, recursive: Bool, query: String, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
+    public func searchFiles(path: String, recursive: Bool, query: String, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
        let predicate = NSPredicate(format: "name BEGINSWITH[c] %@", query)
-        self.searchFiles(path: path, recursive: recursive, query: predicate, foundItemHandler: foundItemHandler, completionHandler: completionHandler)
+        return self.searchFiles(path: path, recursive: recursive, query: predicate, foundItemHandler: foundItemHandler, completionHandler: completionHandler)
    }
    
    /// The maximum number of queued operations that can execute at the same time.
@@ -153,8 +165,6 @@ extension FileProviderBasic {
            operation_queue.maxConcurrentOperationCount = newValue
        }
    }
-    
-    
 }

 /// Checking equality of two file provider, regardless of current path queues and delegates.
@@ -232,7 +242,7 @@ internal extension FileProviderBasicRemote {
        return false
    }
    
-    func runDataTask(with request: URLRequest, operationHandle: RemoteOperationHandle? = nil, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Swift.Void) {
+    func runDataTask(with request: URLRequest, operation: FileOperationType? = nil, completionHandler: @escaping (Data?, URLResponse?, Error?) -> Swift.Void) {
        let useCache = self.useCache
        let validatingCache = self.validatingCache
        dispatch_queue.async {
@@ -242,8 +252,7 @@ internal extension FileProviderBasicRemote {
                }
            }
            let task = self.session.dataTask(with: request, completionHandler: completionHandler)
-            task.taskDescription = operationHandle?.operationType.json
-            operationHandle?.add(task: task)
+            task.taskDescription = operation?.json
            task.resume()
        }
    }
@@ -262,10 +271,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - folder: Directory name.
       - at: Parent path of new directory.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func create(folder: String, at: String, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func create(folder: String, at: String, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Moves a file or directory from `path` to designated path asynchronously.
@@ -276,10 +285,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - path: original file or directory path.
       - to: destination path of file or directory, including file/directory name.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func moveItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func moveItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Moves a file or directory from `path` to designated path asynchronously.
@@ -291,10 +300,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - to: destination path of file or directory, including file/directory name.
       - overwrite: Destination file should be overwritten if file is already exists. **Default** is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func moveItem(path: String, to: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func moveItem(path: String, to: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Copies a file or directory from `path` to designated path asynchronously.
@@ -305,10 +314,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - path: original file or directory path.
       - to: destination path of file or directory, including file/directory name.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func copyItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func copyItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Copies a file or directory from `path` to designated path asynchronously.
@@ -320,10 +329,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - to: destination path of file or directory, including file/directory name.
       - overwrite: Destination file should be overwritten if file is already exists. **Default** is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func copyItem(path: String, to: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func copyItem(path: String, to: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Removes the file or directory at the specified path.
@@ -331,11 +340,11 @@ public protocol FileProviderOperations: FileProviderBasic {
     - Parameters:
       - path: file or directory path.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     
     */
    @discardableResult
-    func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Uploads a file from local file url to designated path asynchronously.
@@ -347,10 +356,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - localFile: a file url to file.
       - to: destination path of file, including file/directory name.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress.
+     - Returns: An `Progress` to get progress or cancel progress.
     */
    @discardableResult
-    func copyItem(localFile: URL, to: String, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func copyItem(localFile: URL, to: String, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Uploads a file from local file url to designated path asynchronously.
@@ -363,10 +372,10 @@ public protocol FileProviderOperations: FileProviderBasic {
       - to: destination path of file, including file/directory name.
       - overwrite: Destination file should be overwritten if file is already exists. **Default** is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress.
+     - Returns: An `Progress` to get progress or cancel progress.
     */
    @discardableResult
-    func copyItem(localFile: URL, to: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func copyItem(localFile: URL, to: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Download a file from `path` to designated local file url asynchronously.
@@ -378,33 +387,33 @@ public protocol FileProviderOperations: FileProviderBasic {
       - path: original file or directory path.
       - toLocalURL: destination local url of file, including file/directory name.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> Progress?
 }

 public extension FileProviderOperations {
    /// *DEPRECATED:* Use Use FileProviderReadWrite.writeContents(path:, data:, completionHandler:) method instead.
    @available(*, deprecated, message: "Use FileProviderReadWrite.writeContents(path:, data:, completionHandler:) method instead.")
    @discardableResult
-    public func create(file: String, at: String, contents data: Data?, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func create(file: String, at: String, contents data: Data?, completionHandler: SimpleCompletionHandler) -> Progress? {
        let path = (at as NSString).appendingPathComponent(file)
        return (self as? FileProviderReadWrite)?.writeContents(path: path, contents: data, completionHandler: completionHandler)
    }
    
    @discardableResult
-    public func moveItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func moveItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        return self.moveItem(path: path, to: to, overwrite: false, completionHandler: completionHandler)
    }
    
    @discardableResult
-    public func copyItem(localFile: URL, to: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func copyItem(localFile: URL, to: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        return self.copyItem(localFile: localFile, to: to, overwrite: false, completionHandler: completionHandler)
    }
    
    @discardableResult
-    public func copyItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func copyItem(path: String, to: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        return self.copyItem(path: path, to: to, overwrite: false, completionHandler: completionHandler)
    }
 }
@@ -420,10 +429,10 @@ public protocol FileProviderReadWrite: FileProviderBasic {
       - completionHandler: a closure with result of file contents or error.
         - `contents`: contents of file in a `Data` object.
         - `error`: Error returned by system.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
    */
    @discardableResult
-    func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle?
+    func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress?
    
    /**
     Retreives a `Data` object with a portion contents of the file asynchronously vis contents argument of completion handler.
@@ -436,10 +445,10 @@ public protocol FileProviderReadWrite: FileProviderBasic {
       - completionHandler: a closure with result of file contents or error.
         - `contents`: contents of file in a `Data` object.
         - `error`: Error returned by system.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle?
+    func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress?
    
    /**
     Write the contents of the `Data` to a location asynchronously.
@@ -450,10 +459,10 @@ public protocol FileProviderReadWrite: FileProviderBasic {
       - path: Path of target file.
       - contents: Data to be written into file, pass nil to create empty file.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func writeContents(path: String, contents: Data?, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func writeContents(path: String, contents: Data?, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Write the contents of the `Data` to a location asynchronously.
@@ -464,10 +473,10 @@ public protocol FileProviderReadWrite: FileProviderBasic {
       - contents: Data to be written into file, pass nil to create empty file.
       - atomically: data will be written to a temporary file before writing to final location. Default is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func writeContents(path: String, contents: Data?, atomically: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func writeContents(path: String, contents: Data?, atomically: Bool, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Write the contents of the `Data` to a location asynchronously.
@@ -478,10 +487,10 @@ public protocol FileProviderReadWrite: FileProviderBasic {
       - contents: Data to be written into file, pass nil to create empty file.
       - overwrite: Destination file should be overwritten if file is already exists. Default is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func writeContents(path: String, contents: Data?, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func writeContents(path: String, contents: Data?, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress?
    
    /**
     Write the contents of the `Data` to a location asynchronously.
@@ -492,30 +501,30 @@ public protocol FileProviderReadWrite: FileProviderBasic {
       - overwrite: Destination file should be overwritten if file is already exists. Default is `false`.
       - atomically: data will be written to a temporary file before writing to final location. Default is `false`.
       - completionHandler: If an error parameter was provided, a presentable `Error` will be returned.
-     - Returns: An `OperationHandle` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
+     - Returns: An `Progress` to get progress or cancel progress. Doesn't work on `LocalFileProvider`.
     */
    @discardableResult
-    func writeContents(path: String, contents: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle?
+    func writeContents(path: String, contents: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress?
 }

 extension FileProviderReadWrite {
    @discardableResult
-    public func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle?{
+    public func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
        return self.contents(path: path, offset: 0, length: -1, completionHandler: completionHandler)
    }
    
    @discardableResult
-    public func writeContents(path: String, contents: Data?, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func writeContents(path: String, contents: Data?, completionHandler: SimpleCompletionHandler) -> Progress? {
        return self.writeContents(path: path, contents: contents, atomically: false, overwrite: false, completionHandler: completionHandler)
    }
    
    @discardableResult
-    public func writeContents(path: String, contents: Data?, atomically: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func writeContents(path: String, contents: Data?, atomically: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        return self.writeContents(path: path, contents: contents, atomically: atomically, overwrite: false, completionHandler: completionHandler)
    }
    
    @discardableResult
-    public func writeContents(path: String, contents: Data?, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public func writeContents(path: String, contents: Data?, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        return self.writeContents(path: path, contents: contents, atomically: false, overwrite: overwrite, completionHandler: completionHandler)
    }
 }
@@ -561,7 +570,7 @@ public protocol FileProvideUndoable: FileProviderOperations {
    var undoManager: UndoManager? { get set }
    
    /// UndoManager supports undoing this file operation
-    func canUndo(handle: OperationHandle) -> Bool
+    func canUndo(handle: Progress) -> Bool
    /// UndoManager supports undoing this operation
    func canUndo(operation: FileOperationType) -> Bool
 }
@@ -571,8 +580,11 @@ public extension FileProvideUndoable {
        return undoOperation(for: operation) != nil
    }
    
-    public func canUndo(handle: OperationHandle) -> Bool {
-        return canUndo(operation: handle.operationType)
+    public func canUndo(handle: Progress) -> Bool {
+        if let operationType = handle.userInfo[.fileProvderOperationTypeKey] as? FileOperationType {
+            return canUndo(operation: operationType)
+        }
+        return false
    }
    
    internal func undoOperation(for operation: FileOperationType) -> FileOperationType? {
@@ -602,14 +614,37 @@ public extension FileProvideUndoable {
    }
 }

+/// This protocol defines method to share a public link with other users
+public protocol FileProviderSharing {
+    /**
+     Genrates a public url to a file to be shared with other users and can be downloaded without authentication.
+     
+     - Important: In some providers url will be available for a limitied time, determined in `expiration` argument.
+         e.g. Dropbox links will be expired after 4 hours.
+     
+     - Parameters:
+         - to: path of file, including file/directory name.
+         - completionHandler: a closure with result of directory entries or error.
+             - `link`: a url returned by Dropbox to share.
+             - `attribute`: a `FileObject` containing the attributes of the item.
+             - `expiration`: a `Date` object, determines when the public url will expires.
+             - `error`: Error returned by server.
+     */
+    func publicLink(to path: String, completionHandler: @escaping ((_ link: URL?, _ attribute: FileObject?, _ expiration: Date?, _ error: Error?) -> Void))
+}
+
 /// Defines protocol for provider allows all common operations.
-public protocol FileProvider: FileProviderBasic, FileProviderOperations, FileProviderReadWrite, NSCopying {
+public protocol FileProvider: FileProviderOperations, FileProviderReadWrite, NSCopying {
 }

 internal let pathTrimSet = CharacterSet(charactersIn: " /")
 extension FileProviderBasic {
    public var type: String {
+        #if swift(>=3.1)
+        return Swift.type(of: self).type
+        #else
        return type(of: self).type
+        #endif
    }
    
    public func url(of path: String? = nil) -> URL {
@@ -625,26 +660,29 @@ extension FileProviderBasic {
        }
    }
    
-    
-    /// Returns the relative path of url, wothout percent encoding. Even if url is absolute or
-    /// retrieved from another provider, it will try to resolve the url against `baseURL` of
-    /// current provider. It's highly recomended to use this method for displaying purposes.
-    ///
-    /// - Parameter url: Absolute url to file or directory.
-    /// - Returns: A `String` contains relative path of url against base url.
    public func relativePathOf(url: URL) -> String {
        // check if url derieved from current base url
        let relativePath = url.relativePath
        if !relativePath.isEmpty, url.baseURL == self.baseURL {
-            return relativePath.removingPercentEncoding ?? relativePath
+            return (relativePath.removingPercentEncoding ?? relativePath).replacingOccurrences(of: "/", with: "", options: .anchored)
        }
        
        // resolve url string against baseurl
-        guard let baseURL = self.baseURL?.standardizedFileURL else { return url.absoluteString }
-        let standardPath = url.absoluteString.replacingOccurrences(of: "file:///private/var/", with: "file:///var/", options: .anchored)
-        let standardBase = baseURL.absoluteString.replacingOccurrences(of: "file:///private/var/", with: "file:///var/", options: .anchored)
-        let standardRelativePath = standardPath.replacingOccurrences(of: standardBase, with: "/")
-        return standardRelativePath.removingPercentEncoding ?? standardRelativePath
+        if baseURL?.isFileURL ?? false {
+            guard let baseURL = self.baseURL?.standardizedFileURL else { return url.absoluteString }
+            let standardPath = url.absoluteString.replacingOccurrences(of: "file:///private/var/", with: "file:///var/", options: .anchored)
+            let standardBase = baseURL.absoluteString.replacingOccurrences(of: "file:///private/var/", with: "file:///var/", options: .anchored)
+            let standardRelativePath = standardPath.replacingOccurrences(of: standardBase, with: "/").replacingOccurrences(of: "/", with: "", options: .anchored)
+            return standardRelativePath.removingPercentEncoding ?? standardRelativePath
+        } else {
+            guard let baseURL = self.baseURL else { return url.absoluteString }
+            let standardRelativePath = url.absoluteString.replacingOccurrences(of: baseURL.absoluteString, with: "/").replacingOccurrences(of: "/", with: "", options: .anchored)
+            if URLComponents(string: standardRelativePath)?.host?.isEmpty ?? true {
+                return standardRelativePath.removingPercentEncoding ?? standardRelativePath
+            } else {
+                return relativePath.replacingOccurrences(of: "/", with: "", options: .anchored)
+            }
+        }
    }
    
    internal func correctPath(_ path: String?) -> String? {
@@ -679,7 +717,7 @@ extension FileProviderBasic {
            }
            var i = number ?? 2
            let similiar = contents.map {
-                $0.url?.lastPathComponent ?? $0.name
+                $0.url.lastPathComponent.isEmpty ? $0.name : $0.url.lastPathComponent
            }.filter {
                $0.hasPrefix(result)
            }
@@ -699,6 +737,8 @@ extension FileProviderBasic {
        let domain: String
        switch code {
        case is URLError:
+            fallthrough
+        case is URLError.Code:
            domain = NSURLErrorDomain
        default:
            domain = NSCocoaErrorDomain
@@ -830,19 +870,20 @@ extension ExtendedFileProvider {
            return resultingImage
        #else
            let ppp = Int(UIScreen.main.scale) // fetch device is retina or not
-            guard let context = UIGraphicsGetCurrentContext() else {
-                return nil
-            }
            size.width  *= CGFloat(ppp)
            size.height *= CGFloat(ppp)
            UIGraphicsBeginImageContext(size)
-            
+            guard let context = UIGraphicsGetCurrentContext() else {
+                return nil
+            }
            context.saveGState()
            let transform = pdfPage.getDrawingTransform(CGPDFBox.mediaBox, rect: rect, rotate: 0, preserveAspectRatio: true)
            context.concatenate(transform)
            
            context.translateBy(x: 0, y: size.height)
            context.scaleBy(x: CGFloat(ppp), y: CGFloat(-ppp))
+            context.setFillColor(UIColor.white.cgColor)
+            context.fill(rect)
            context.drawPDFPage(pdfPage)
            
            context.restoreGState()
@@ -915,10 +956,10 @@ public enum FileOperationType: CustomStringConvertible {
    }
    
    /// Path of subjecting file.
-    public var source: String? {
-        guard let reflect = Mirror(reflecting: self).children.first?.value else { return nil }
+    public var source: String {
+        let reflect = Mirror(reflecting: self).children.first!.value
        let mirror = Mirror(reflecting: reflect)
-        return reflect as? String ?? mirror.children.first?.value as? String
+        return reflect as? String ?? mirror.children.first?.value as! String
    }
    
    /// Path of subjecting file.
@@ -939,6 +980,8 @@ public enum FileOperationType: CustomStringConvertible {
        }
        let dest = json["dest"] as? String
        switch type {
+        case "Fetch":
+            self = .fetch(path: source)
        case "Create":
            self = .create(path: source)
        case "Modify":
@@ -968,6 +1011,7 @@ public enum FileOperationType: CustomStringConvertible {
 }

 /// Allows to get progress or cancel an in-progress operation, useful for remote providers
+@available(*, obsoleted: 1.0, message: "Use Progress class class instead.")
 public protocol OperationHandle {
    /// Operation supposed to be done on files. Contains file paths as associated value.
    var operationType: FileOperationType { get }
@@ -988,14 +1032,6 @@ public protocol OperationHandle {
    func cancel() -> Bool
 }

-public extension OperationHandle {
-    public var progress: Float {
-        let bytesSoFar = self.bytesSoFar
-        let totalBytes = self.totalBytes
-        return totalBytes > 0 ? Float(Double(bytesSoFar) / Double(totalBytes)) : Float.nan
-    }
-}
-
 /// Delegate methods for reporting provider's operation result and progress, when it's ready to update
 /// user interface.
 /// All methods are called in main thread to avoids UI bugs.
@@ -8,7 +8,7 @@

 import Foundation

-extension Array where Element: FileObject {
+public extension Array where Element: FileObject {
    /// Returns a sorted array of `FileObject`s by criterias set in attributes.
    public func sort(by type: FileObjectSorting.SortType, ascending: Bool = true, isDirectoriesFirst: Bool = false) -> [Element] {
        let sorting = FileObjectSorting(type: type, ascending: ascending, isDirectoriesFirst: isDirectoriesFirst)
@@ -21,8 +21,8 @@ extension Array where Element: FileObject {
    }
 }

-extension URLFileResourceType {
-    /// Returns corresponding `URLFileResourceType` of a `FileAttributeType` value
+public extension URLFileResourceType {
+    /// **FileProvider** returns corresponding `URLFileResourceType` of a `FileAttributeType` value
    public init(fileTypeValue: FileAttributeType) {
        switch fileTypeValue {
        case FileAttributeType.typeCharacterSpecial: self = .characterSpecial
@@ -37,20 +37,24 @@ extension URLFileResourceType {
    }
 }

-internal extension URLResourceKey {
-    static let fileURLKey = URLResourceKey(rawValue: "NSURLFileURLKey")
-    static let serverDateKey = URLResourceKey(rawValue: "NSURLServerDateKey")
-    static let entryTagKey = URLResourceKey(rawValue: "NSURLEntryTagKey")
-    static let mimeTypeKey = URLResourceKey(rawValue: "NSURLMIMETypeIdentifierKey")
-    
-    @available(*, deprecated, renamed: "fileURLKey")
-    static let fileURL = fileURLKey
-    @available(*, deprecated, renamed: "serverDateKey")
-    static let serverDate = serverDateKey
-    @available(*, deprecated, renamed: "entryTagKey")
-    static let entryTag = entryTagKey
-    @available(*, deprecated, renamed: "mimeTypeKey")
-    static let mimeType = mimeTypeKey
+public extension URLResourceKey {
+    /// **FileProvider** returns url of file object.
+    public static let fileURLKey = URLResourceKey(rawValue: "NSURLFileURLKey")
+    /// **FileProvider** returns modification date of file in server
+    public static let serverDateKey = URLResourceKey(rawValue: "NSURLServerDateKey")
+    /// **FileProvider** returns HTTP ETag string of remote resource
+    public static let entryTagKey = URLResourceKey(rawValue: "NSURLEntryTagKey")
+    /// **FileProvider** returns MIME type of file, if returned by server
+    public static let mimeTypeKey = URLResourceKey(rawValue: "NSURLMIMETypeIdentifierKey")
+    /// **FileProvider** returns either file is encrypted or not
+    public static let isEncryptedKey = URLResourceKey(rawValue: "NSURLIsEncryptedKey")
+}
+
+public extension ProgressUserInfoKey {
+    /// **FileProvider** returns associated `FileProviderOperationType`
+    public static let fileProvderOperationTypeKey = ProgressUserInfoKey("FilesProviderOperationTypeKey")
+    /// **FileProvider** returns start date/time of operation
+    public static let startingTimeKey = ProgressUserInfoKey("NSProgressStartingTimeKey")
 }

 internal extension URL {
@@ -71,6 +75,76 @@ internal extension URL {
    }
 }

+internal extension URLRequest {
+    mutating func set(httpAuthentication credential: URLCredential?, with type: HTTPAuthenticationType) {
+        func base64(_ str: String) -> String {
+            let plainData = str.data(using: .utf8)
+            let base64String = plainData!.base64EncodedString(options: [])
+            return base64String
+        }
+        
+        guard let credential = credential else { return }
+        switch type {
+        case .basic:
+            let authStr = "\(credential.user ?? ""):\(credential.password ?? "")"
+            self.setValue("Basic \(authStr)", forHTTPHeaderField: "Authorization")
+        case .digest:
+            // handled by RemoteSessionDelegate
+            break
+        case .oAuth1:
+            if let oauth = credential.password {
+                self.setValue("OAuth \(oauth)", forHTTPHeaderField: "Authorization")
+            }
+        case .oAuth2:
+            if let bearer = credential.password {
+                self.setValue("Bearer \(bearer)", forHTTPHeaderField: "Authorization")
+            }
+        }
+    }
+    
+    mutating func set(rangeWithOffset offset: Int64, length: Int) {
+        if length > 0 {
+            self.setValue("bytes=\(offset)-\(offset + Int64(length) - 1)", forHTTPHeaderField: "Range")
+        } else if offset > 0 && length < 0 {
+            self.setValue("bytes=\(offset)-", forHTTPHeaderField: "Range")
+        }
+    }
+    
+    enum ContentType: String {
+        case json = "application/json"
+        case stream = "application/octet-stream"
+        case xml = "text/xml; charset=\"utf-8\""
+    }
+    
+    mutating func set(contentType: ContentType) {
+        self.setValue(contentType.rawValue, forHTTPHeaderField: "Content-Type")
+    }
+    
+    private func asciiEscape(string:String) -> String {
+        var res = ""
+        for char in string.unicodeScalars {
+            let substring = String(char)
+            if substring.canBeConverted(to: .ascii) {
+                res.append(substring)
+            } else {
+                res = res.appendingFormat("\\u%04x", char.value)
+            }
+        }
+        return res
+    }
+    
+    mutating func set(dropboxArgKey requestDictionary: [String: AnyObject]) {
+        guard let jsonData = try? JSONSerialization.data(withJSONObject: requestDictionary, options: []) else {
+            return
+        }
+        guard var jsonString = String(data: jsonData, encoding: .utf8) else { return }
+        jsonString = self.asciiEscape(string: jsonString)
+        jsonString = jsonString.replacingOccurrences(of: "\\/", with: "/")
+        
+        self.setValue(jsonString, forHTTPHeaderField: "Dropbox-API-Arg")
+    }
+}
+
 internal extension Data {
    internal var isPDF: Bool {
        return self.count > 4 && self.scanString(length: 4, using: .ascii) == "%PDF"
@@ -160,7 +234,7 @@ internal extension TimeInterval {
    }
 }

-extension Date {
+internal extension Date {
   init?(rfcString: String) {
        let dateFor: DateFormatter = DateFormatter()
        dateFor.locale = Locale(identifier: "en_US")
@@ -197,7 +271,7 @@ extension Date {
    }
 }

-extension NSPredicate {
+internal extension NSPredicate {
    func findValue(forKey key: String?, operator op: NSComparisonPredicate.Operator? = nil) -> Any? {
        let val = findAllValues(forKey: key).lazy.filter { (op == nil || $0.operator == op!) && !$0.not }
        return val.first?.value
@@ -0,0 +1,393 @@
+//
+//  HTTPFileProvider.swift
+//  FilesProvider
+//
+//  Created by Amir Abbas Mousavian.
+//  Copyright © 2017 Mousavian. Distributed under MIT license.
+//
+
+import Foundation
+
+/**
+ Allows accessing to Dropbox stored files. This provider doesn't cache or save files internally, however you can
+ set `useCache` and `cache` properties to use Foundation `NSURLCache` system.
+ 
+ - Note: Uploading files and data are limited to 150MB, for now.
+ */
+open class HTTPFileProvider: FileProviderBasicRemote, FileProviderOperations, FileProviderReadWrite {
+    open class var type: String { fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.") }
+    open let baseURL: URL?
+    open var currentPath: String
+    
+    open var dispatch_queue: DispatchQueue
+    open var operation_queue: OperationQueue {
+        willSet {
+            assert(_session == nil, "It's not effective to change dispatch_queue property after session is initialized.")
+        }
+    }
+    
+    open weak var delegate: FileProviderDelegate?
+    open var credential: URLCredential? {
+        didSet {
+            sessionDelegate?.credential = self.credential
+        }
+    }
+    open private(set) var cache: URLCache?
+    public var useCache: Bool
+    public var validatingCache: Bool
+    
+    fileprivate var _session: URLSession?
+    internal fileprivate(set) var sessionDelegate: SessionDelegate?
+    public var session: URLSession {
+        get {
+            if _session == nil {
+                self.sessionDelegate = SessionDelegate(fileProvider: self)
+                let config = URLSessionConfiguration.default
+                config.urlCache = cache
+                config.requestCachePolicy = .returnCacheDataElseLoad
+                _session = URLSession(configuration: config, delegate: sessionDelegate as URLSessionDelegate?, delegateQueue: self.operation_queue)
+                _session!.sessionDescription = UUID().uuidString
+                initEmptySessionHandler(_session!.sessionDescription!)
+            }
+            return _session!
+        }
+        
+        set {
+            assert(newValue.delegate is SessionDelegate, "session instances should have a SessionDelegate instance as delegate.")
+            _session = newValue
+            if session.sessionDescription?.isEmpty ?? true {
+                _session?.sessionDescription = UUID().uuidString
+            }
+            self.sessionDelegate = newValue.delegate as? SessionDelegate
+            initEmptySessionHandler(_session!.sessionDescription!)
+        }
+    }
+    
+    fileprivate var _longpollSession: URLSession?
+    internal var longpollSession: URLSession {
+        if _longpollSession == nil {
+            let config = URLSessionConfiguration.default
+            config.timeoutIntervalForRequest = 600
+            _longpollSession = URLSession(configuration: config, delegate: nil, delegateQueue: nil)
+        }
+        return _longpollSession!
+    }
+    
+    public init(baseURL: URL?, credential: URLCredential?, cache: URLCache?) {
+        self.baseURL = baseURL
+        self.currentPath = ""
+        self.useCache = false
+        self.validatingCache = true
+        self.cache = cache
+        self.credential = credential
+        
+        #if swift(>=3.1)
+            let queueLabel = "FileProvider.\(Swift.type(of: self).type)"
+        #else
+            let queueLabel = "FileProvider.\(type(of: self).type)"
+        #endif
+        dispatch_queue = DispatchQueue(label: queueLabel, attributes: .concurrent)
+        operation_queue = OperationQueue()
+        operation_queue.name = "\(queueLabel).Operation"
+    }
+    
+    public required convenience init?(coder aDecoder: NSCoder) {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    public func encode(with aCoder: NSCoder) {
+        aCoder.encode(self.baseURL, forKey: "baseURL")
+        aCoder.encode(self.credential, forKey: "credential")
+        aCoder.encode(self.currentPath, forKey: "currentPath")
+        aCoder.encode(self.useCache, forKey: "useCache")
+        aCoder.encode(self.validatingCache, forKey: "validatingCache")
+    }
+    
+    public static var supportsSecureCoding: Bool {
+        return true
+    }
+    
+    open func copy(with zone: NSZone? = nil) -> Any {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    deinit {
+        if let sessionuuid = _session?.sessionDescription {
+            removeSessionHandler(for: sessionuuid)
+        }
+        
+        if fileProviderCancelTasksOnInvalidating {
+            _session?.invalidateAndCancel()
+        } else {
+            _session?.finishTasksAndInvalidate()
+        }
+    }
+    
+    open func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    open func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    open func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
+        self.storageProperties { total, _ in
+            completionHandler(total > 0)
+        }
+    }
+    
+    open weak var fileOperationDelegate: FileOperationDelegate?
+    
+    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let path = (atPath as NSString).appendingPathComponent(folderName) + "/"
+        return doOperation(.create(path: path), completionHandler: completionHandler)
+    }
+    
+    open func moveItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return doOperation(.move(source: path, destination: toPath), completionHandler: completionHandler)
+    }
+    
+    open func copyItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return doOperation(.copy(source: path, destination: toPath), completionHandler: completionHandler)
+    }
+    
+    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
+        return doOperation(.remove(path: path), completionHandler: completionHandler)
+    }
+    
+    internal func request(for operation: FileOperationType, overwrite: Bool = false, attributes: [URLResourceKey: Any] = [:]) -> URLRequest {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    internal func serverError(with code: FileProviderHTTPErrorCode, path: String?, data: Data?) -> FileProviderHTTPError {
+        fatalError("HTTPFileProvider is an abstract class. Please implement \(#function) in subclass.")
+    }
+    
+    internal func multiStatusHandler(source: String, data: Data, completionHandler: SimpleCompletionHandler) -> Void {
+        // WebDAV will override this function
+    }
+    
+    fileprivate func doOperation(_ operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> Progress? {
+        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: operation) ?? true == true else {
+            return nil
+        }
+        
+        let progress = Progress(totalUnitCount: 1)
+        progress.setUserInfoObject(operation, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
+        let request = self.request(for: operation)
+        
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var serverError: FileProviderHTTPError?
+            if let response = response as? HTTPURLResponse, response.statusCode >= 300, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) {
+                serverError = self.serverError(with: code, path: operation.source, data: data)
+            }
+            
+            if let response = response as? HTTPURLResponse, FileProviderHTTPErrorCode(rawValue: response.statusCode) == .multiStatus, let data = data {
+                self.multiStatusHandler(source: operation.source, data: data, completionHandler: completionHandler)
+            }
+            
+            if serverError == nil && error == nil {
+                progress.completedUnitCount = 1
+            } else {
+                progress.cancel()
+            }
+            completionHandler?(serverError ?? error)
+            self.delegateNotify(operation, error: serverError ?? error)
+        })
+        task.taskDescription = operation.json
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+        task.resume()
+        return progress
+    }
+    
+    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
+        // check file is not a folder
+        guard (try? localFile.resourceValues(forKeys: [.fileResourceTypeKey]))?.fileResourceType ?? .unknown == .regular else {
+            dispatch_queue.async {
+                completionHandler?(self.throwError(localFile.path, code: URLError.fileIsDirectory))
+            }
+            return nil
+        }
+        
+        let operation = FileOperationType.copy(source: localFile.absoluteString, destination: toPath)
+        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: operation) ?? true == true else {
+            return nil
+        }
+        let request = self.request(for: operation, overwrite: overwrite)
+        return upload_simple(toPath, request: request, localFile: localFile, operation: operation, completionHandler: completionHandler)
+    }
+    
+    open func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let operation = FileOperationType.copy(source: path, destination: destURL.absoluteString)
+        let request = self.request(for: operation)
+        return self.download_simple(path: path, request: request, operation: operation, completionHandler: { [weak self] (tempURL, error) in
+            if let error = error {
+                completionHandler?(error)
+                self?.delegateNotify(operation, error: error)
+                return
+            }
+            
+            guard let tempURL = tempURL else {
+                completionHandler?(error)
+                self?.delegateNotify(operation, error: error)
+                return
+            }
+            
+            do {
+                try FileManager.default.moveItem(at: tempURL, to: destURL)
+                completionHandler?(nil)
+                self?.delegateNotify(operation, error: nil)
+            } catch let e {
+                completionHandler?(e)
+                self?.delegateNotify(operation, error: e)
+            }
+        })
+    }
+    
+    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
+        if length == 0 || offset < 0 {
+            dispatch_queue.async {
+                completionHandler(Data(), nil)
+            }
+            return nil
+        }
+        
+        let operation = FileOperationType.fetch(path: path)
+        var request = self.request(for: operation)
+        request.set(rangeWithOffset: offset, length: length)
+        return self.download_simple(path: path, request: request, operation: operation, completionHandler: { (tempURL, error) in
+            if let error = error {
+                completionHandler(nil, error)
+                return
+            }
+            
+            guard let tempURL = tempURL else {
+                completionHandler(nil, error)
+                return
+            }
+            
+            do {
+                let data = try Data(contentsOf: tempURL)
+                completionHandler(data, nil)
+            } catch let e {
+                completionHandler(nil, e)
+            }
+        })
+    }
+    
+    public func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let operation = FileOperationType.modify(path: path)
+        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: operation) ?? true == true else {
+            return nil
+        }
+        let request = self.request(for: operation, overwrite: overwrite, attributes: [.contentModificationDateKey: Date()])
+        return upload_simple(path, request: request, data: data ?? Data(), operation: operation, completionHandler: completionHandler)
+    }
+
+    internal func upload_simple(_ targetPath: String, request: URLRequest, data: Data? = nil, localFile: URL? = nil, operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let size = data?.count ?? Int((try? localFile?.resourceValues(forKeys: [.fileSizeKey]))??.fileSize ?? -1)
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(operation, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        progress.totalUnitCount = Int64(size)
+        
+        let task: URLSessionUploadTask
+        if let data = data {
+            task = session.uploadTask(with: request, from: data)
+        } else if let localFile = localFile {
+            task = session.uploadTask(with: request, fromFile: localFile)
+        } else {
+            return nil
+        }
+        
+        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { [weak self] error in
+            var responseError: FileProviderHTTPError?
+            if let code = (task.response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
+                // We can't fetch server result from delegate!
+                responseError = self?.serverError(with: rCode, path: targetPath, data: nil)
+            }
+            if !(responseError == nil && error == nil) {
+                progress.cancel()
+            }
+            completionHandler?(responseError ?? error)
+            self?.delegateNotify(operation, error: responseError ?? error)
+        }
+        task.taskDescription = operation.json
+        task.addObserver(sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesSent), options: .new, context: &progress)
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+        task.resume()
+        return progress
+    }
+    
+    internal func download_simple(path: String, request: URLRequest, operation: FileOperationType, completionHandler: @escaping ((_ tempURL: URL?, _ error: Error?) -> Void)) -> Progress? {
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(operation, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
+        let task = session.downloadTask(with: request)
+        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
+            if error != nil {
+                progress.cancel()
+            }
+            completionHandler(nil, error)
+        }
+        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
+            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
+                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
+                let errorData : Data? = nil //Data(contentsOf:cacheURL) // TODO: Figure out how to get error response data for the error description
+                let serverError : FileProviderHTTPError? = code != nil ? self.serverError(with: code!, path: path, data: errorData) : nil
+                if serverError != nil {
+                    progress.cancel()
+                }
+                completionHandler(nil, serverError)
+                return
+            }
+            
+            completionHandler(tempURL, nil)
+        }
+        task.taskDescription = operation.json
+        task.addObserver(sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesReceived), options: .new, context: &progress)
+        task.addObserver(sessionDelegate!, forKeyPath: #keyPath(URLSessionTask.countOfBytesExpectedToReceive), options: .new, context: &progress)
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+        task.resume()
+        return progress
+    }
+}
+
+extension HTTPFileProvider {
+    internal func delegateNotify(_ operation: FileOperationType, error: Error?) {
+        DispatchQueue.main.async(execute: {
+            if error == nil {
+                self.delegate?.fileproviderSucceed(self, operation: operation)
+            } else {
+                self.delegate?.fileproviderFailed(self, operation: operation)
+            }
+        })
+    }
+}
+
+extension HTTPFileProvider: FileProvider { }
@@ -98,14 +98,19 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
        guard baseURL.isFileURL else {
            fatalError("Cannot initialize a Local provider from remote URL.")
        }
-        self.baseURL = baseURL
+        self.baseURL = (baseURL.absoluteString.hasSuffix("/") ? baseURL : baseURL.appendingPathComponent("")).absoluteURL
        self.currentPath = ""
        self.credential = nil
        self.isCoorinating = false
        
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: .concurrent)
+        #if swift(>=3.1)
+        let queueLabel = "FileProvider.\(Swift.type(of: self).type)"
+        #else
+        let queueLabel = "FileProvider.\(type(of: self).type)"
+        #endif
+        dispatch_queue = DispatchQueue(label: queueLabel, attributes: .concurrent)
        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
+        operation_queue.name = "\(queueLabel).Operation"
        
        fileProviderManagerDelegate = LocalFileProviderManagerDelegate(provider: self)
        opFileManager.delegate = fileProviderManagerDelegate
@@ -168,22 +173,32 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
        completionHandler(totalSize, totalSize - freeSize)
    }
    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
+    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(self.url(of: path), forKey: .fileURLKey)
+        
        dispatch_queue.async {
+            progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
            let iterator = self.fileManager.enumerator(at: self.url(of: path), includingPropertiesForKeys: nil, options: recursive ? [] : [.skipsSubdirectoryDescendants, .skipsPackageDescendants]) { (url, e) -> Bool in
                completionHandler([], e)
                return true
            }
            var result = [LocalFileObject]()
            while let fileURL = iterator?.nextObject() as? URL {
+                if progress.isCancelled {
+                    break
+                }
                let path = self.relativePathOf(url: fileURL)
                if let fileObject = LocalFileObject(fileWithPath: path, relativeTo: self.baseURL), query.evaluate(with: fileObject.mapPredicate()) {
                    result.append(fileObject)
+                    progress.completedUnitCount = Int64(result.count)
                    foundItemHandler?(fileObject)
                }
            }
            completionHandler(result, nil)
        }
+        
+        return progress
    }
    
    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
@@ -195,13 +210,13 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
    open weak var fileOperationDelegate : FileOperationDelegate?
    
    @discardableResult
-    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.create(path: (atPath as NSString).appendingPathComponent(folderName) + "/")
        return self.doOperation(opType, completionHandler: completionHandler)
    }
    
    @discardableResult
-    open func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.move(source: path, destination: toPath)

        if !overwrite && self.fileManager.fileExists(atPath: self.url(of: toPath).path) {
@@ -213,7 +228,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
    }
    
    @discardableResult
-    open func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.copy(source: path, destination: toPath)
        
        if !overwrite && self.fileManager.fileExists(atPath: self.url(of: toPath).path) {
@@ -227,13 +242,13 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
    }
    
    @discardableResult
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.remove(path: path)
        return self.doOperation(opType, completionHandler: completionHandler)
    }
    
    @discardableResult
-    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        if !overwrite && self.fileManager.fileExists(atPath: self.url(of: toPath).path) {
            self.dispatch_queue.async {
                completionHandler?(self.throwError(toPath, code: CocoaError.fileWriteFileExists as FoundationErrorEnum))
@@ -245,12 +260,12 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
    }
    
    @discardableResult
-    open func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.copy(source: path, destination: toLocalURL.absoluteString)
        return self.doOperation(opType, completionHandler: completionHandler)
    }
    
-    dynamic func doSimpleOperation(_ box: UndoBox) {
+    @objc dynamic func doSimpleOperation(_ box: UndoBox) {
        guard let _ = self.undoManager else { return }
        _ = self.doOperation(box.undoOperation) { (_) in
            return
@@ -258,8 +273,12 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
    }
    
    @discardableResult
-    fileprivate func doOperation(_ opType: FileOperationType, data: Data? = nil, atomically: Bool = false, forUploading: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        
+    fileprivate func doOperation(_ opType: FileOperationType, data: Data? = nil, atomically: Bool = false, forUploading: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.isCancellable = false
+        progress.setUserInfoObject(Progress.FileOperationKind.receiving, forKey: .fileOperationKindKey)
        func urlofpath(path: String) -> URL {
            if path.hasPrefix("file://") {
                let removedSchemePath = path.replacingOccurrences(of: "file://", with: "", options: .anchored)
@@ -270,9 +289,10 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            }
        }
        
-        guard let sourcePath = opType.source else { return nil }
+        let sourcePath = opType.source
        let destPath = opType.destination
        let source: URL = urlofpath(path: sourcePath)
+        progress.setUserInfoObject(source, forKey: .fileURLKey)
        
        let dest: URL?
        if let destPath = destPath {
@@ -293,22 +313,31 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
        
        let operationHandler: (URL, URL?) -> Void = { source, dest in
            do {
+                progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
                switch opType {
                case .create:
                    if sourcePath.hasSuffix("/") {
+                        progress.totalUnitCount = 1
                        try self.opFileManager.createDirectory(at: source, withIntermediateDirectories: true, attributes: [:])
                    } else {
+                        progress.totalUnitCount = Int64(data?.count ?? 0)
                        try data?.write(to: source, options: .atomic)
                    }
                case .modify:
+                    progress.totalUnitCount = Int64(data?.count ?? 0)
                    try data?.write(to: source, options: atomically ? [.atomic] : [])
                case .copy:
                    guard let dest = dest else { return }
+                    progress.setUserInfoObject(Progress.FileOperationKind.copying, forKey: .fileOperationKindKey)
+                    progress.totalUnitCount = abs(source.fileSize)
                    try self.opFileManager.copyItem(at: source, to: dest)
                case .move:
+                    progress.setUserInfoObject(Progress.FileOperationKind.copying, forKey: .fileOperationKindKey)
                    guard let dest = dest else { return }
+                    progress.totalUnitCount = abs(source.fileSize)
                    try self.opFileManager.moveItem(at: source, to: dest)
                case.remove:
+                    progress.totalUnitCount = abs(source.fileSize)
                    try self.opFileManager.removeItem(at: source)
                default:
                    return
@@ -316,7 +345,8 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                if successfulSecurityScopedResourceAccess {
                    source.stopAccessingSecurityScopedResource()
                }
-                
+
+                progress.completedUnitCount = progress.totalUnitCount
                self.dispatch_queue.async {
                    completionHandler?(nil)
                }
@@ -327,6 +357,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                if successfulSecurityScopedResourceAccess {
                    source.stopAccessingSecurityScopedResource()
                }
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler?(e)
                }
@@ -368,22 +399,32 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                operationHandler(source, dest)
            }
        }
-        
-        return LocalOperationHandle(operationType: opType, baseURL: self.baseURL)
+        return progress
    }
    
    @discardableResult
-    open func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
+    open func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
        let opType = FileOperationType.fetch(path: path)
        let url = self.url(of: path)
        
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.isCancellable = false
+        progress.setUserInfoObject(Progress.FileOperationKind.receiving, forKey: .fileOperationKindKey)
+        progress.setUserInfoObject(url, forKey: .fileURLKey)
+        progress.totalUnitCount = url.fileSize
+        
        let operationHandler: (URL) -> Void = { url in
+            progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
            do {
                let data = try Data(contentsOf: url)
+                progress.completedUnitCount = progress.totalUnitCount
                self.dispatch_queue.async {
                    completionHandler(data, nil)
                }
            } catch let e {
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler(nil, e)
                }
@@ -405,26 +446,33 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                operationHandler(url)
            }
        }
-        
-        return LocalOperationHandle(operationType: opType, baseURL: self.baseURL)
+
+        return progress
    }
    
    @discardableResult
-    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
+    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
        if length == 0 || offset < 0 {
            dispatch_queue.async {
                completionHandler(Data(), nil)
            }
            return nil
        }
-        
+
        if offset == 0 && length < 0 {
            return self.contents(path: path, completionHandler: completionHandler)
        }
-        
+
        let opType = FileOperationType.fetch(path: path)
        let url = self.url(of: path)
        
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.isCancellable = false
+        progress.setUserInfoObject(url, forKey: .fileURLKey)
+        progress.setUserInfoObject(Progress.FileOperationKind.receiving, forKey: .fileOperationKindKey)
+        
        let operationHandler: (URL) -> Void = { url in
            guard let handle = FileHandle(forReadingAtPath: url.path) else {
                self.dispatch_queue.async {
@@ -436,16 +484,20 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            defer {
                handle.closeFile()
            }
-            
+
            let size = LocalFileObject(fileWithURL: url)?.size ?? -1
+            progress.totalUnitCount = size
            guard size > offset else {
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler(nil, self.throwError(path, code: CocoaError.fileReadTooLarge as FoundationErrorEnum))
                }
                return
            }
+            progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
            handle.seek(toFileOffset: UInt64(offset))
            guard Int64(handle.offsetInFile) == offset else {
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler(nil, self.throwError(path, code: CocoaError.fileReadTooLarge as FoundationErrorEnum))
                }
@@ -453,7 +505,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            }
            
            let data = handle.readData(ofLength: length)
-            
+            progress.completedUnitCount = progress.totalUnitCount
            self.dispatch_queue.async {
                completionHandler(data, nil)
            }
@@ -473,11 +525,11 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            }
        }
        
-        return LocalOperationHandle(operationType: opType, baseURL: self.baseURL)
+        return progress
    }
    
    @discardableResult
-    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        let fileExists = fileManager.fileExists(atPath: url(of: path).path)
        let opType: FileOperationType = fileExists ? .modify(path: path) : .create(path: path)
        return self.doOperation(opType, data: data ?? Data(), atomically: atomically, completionHandler: completionHandler)
@@ -10,7 +10,7 @@ import Foundation

 /// Containts path, url and attributes of a local file or resource.
 public final class LocalFileObject: FileObject {
-    internal override init(url: URL, name: String, path: String) {
+    internal override init(url: URL?, name: String, path: String) {
        super.init(url: url, name: name, path: path)
    }
    
@@ -19,12 +19,13 @@ public final class LocalFileObject: FileObject {
        var fileURL: URL?
        var rpath = path.replacingOccurrences(of: relativeURL?.path ?? "", with: "", options: .anchored)
        if relativeURL != nil && rpath.hasPrefix("/") {
-            rpath.remove(at: rpath.startIndex)
+            _=rpath.characters.removeFirst()
        }
        if #available(iOS 9.0, macOS 10.11, tvOS 9.0, *) {
            fileURL = URL(fileURLWithPath: rpath, relativeTo: relativeURL)
        } else {
-            fileURL = URL(string: rpath.isEmpty ? "./" : rpath, relativeTo: relativeURL)
+            rpath = rpath.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? rpath
+            fileURL = URL(string: rpath, relativeTo: relativeURL) ?? relativeURL
        }
        
        if let fileURL = fileURL {
@@ -216,102 +217,6 @@ internal class LocalFileProviderManagerDelegate: NSObject, FileManagerDelegate {
    }
 }

-/// Local operation handling is limited. Please don't use as much as possible.
-open class LocalOperationHandle: OperationHandle {
-    public let baseURL: URL
-    public let operationType: FileOperationType
-    
-    init (operationType: FileOperationType, baseURL: URL?) {
-        self.baseURL = baseURL ?? URL(fileURLWithPath: "/")
-        self.operationType = operationType
-    }
-    
-    private var sourceURL: URL? {
-        guard let source = operationType.source else { return nil }
-        return source.hasPrefix("file://") ? URL(fileURLWithPath: source) : baseURL.appendingPathComponent(source)
-    }
-    
-    private var destURL: URL? {
-        guard let dest = operationType.destination else { return nil }
-        return dest.hasPrefix("file://") ? URL(fileURLWithPath: dest) : baseURL.appendingPathComponent(dest)
-    }
-    
-    /// Caution: may put pressure on CPU, may have latency
-    open var bytesSoFar: Int64 {
-        assert(!Thread.isMainThread, "Don't run \(#function) method on main thread")
-        switch operationType {
-        case .modify:
-            guard let url = sourceURL, url.isFileURL else { return 0 }
-            if url.fileIsDirectory {
-                return iterateDirectory(url, deep: true).totalsize
-            } else {
-                return url.fileSize
-            }
-        case .copy, .move:
-            guard let url = destURL, url.isFileURL else { return 0 }
-            if url.fileIsDirectory {
-                return iterateDirectory(url, deep: true).totalsize
-            } else {
-                return url.fileSize
-            }
-        default:
-            return 0
-        }
-        
-    }
-    
-    /// Caution: may put pressure on CPU, may have latency
-    open var totalBytes: Int64 {
-        assert(!Thread.isMainThread, "Don't run \(#function) method on main thread")
-        switch operationType {
-        case .copy, .move:
-            guard let url = sourceURL, url.isFileURL else { return 0 }
-            if url.fileIsDirectory {
-                return iterateDirectory(url, deep: true).totalsize
-            } else {
-                return url.fileSize
-            }
-        default:
-            return 0
-        }
-    }
-    
-    /// Not usable in local provider
-    open var inProgress: Bool {
-        return false
-    }
-    
-    /// Not usable in local provider
-    open func cancel() -> Bool{
-        return false
-    }
-    
-    func iterateDirectory(_ pathURL: URL, deep: Bool) -> (folders: Int, files: Int, totalsize: Int64) {
-        var folders = 0
-        var files = 0
-        var totalsize: Int64 = 0
-        let keys: [URLResourceKey] = [.isDirectoryKey, .fileSizeKey]
-        let enumOpt: FileManager.DirectoryEnumerationOptions = !deep ? [.skipsSubdirectoryDescendants, .skipsPackageDescendants] : []
-        
-        let fp = FileManager()
-        let filesList = fp.enumerator(at: pathURL, includingPropertiesForKeys: keys, options: enumOpt, errorHandler: nil)
-        while let fileURL = filesList?.nextObject() as? URL {
-            guard let values = try? fileURL.resourceValues(forKeys: [.isDirectoryKey, .fileSizeKey]) else { continue }
-            let isdir = values.isDirectory ?? false
-            let size = Int64(values.fileSize ?? 0)
-            if isdir {
-                folders += 1
-            } else {
-                files += 1
-            }
-            totalsize += size
-        }
-        
-        return (folders, files, totalsize)
-        
-    }
-}
-
 class UndoBox: NSObject {
    weak var provider: FileProvideUndoable?
    let operation: FileOperationType
@@ -1,505 +0,0 @@
-
-//
-//  OneDriveFileProvider.swift
-//  FileProvider
-//
-//  Created by Amir Abbas Mousavian.
-//  Copyright © 2017 Mousavian. Distributed under MIT license.
-//
-
-import Foundation
-import CoreGraphics
-
-/**
- Allows accessing to OneDrive stored files, either hosted on Microsoft servers or business coprporate one.
- This provider doesn't cache or save files internally, however you can set `useCache` and `cache` properties
- to use Foundation `NSURLCache` system.
- 
- - Note: Uploading files and data are limited to 100MB, for now.
- */
-open class OneDriveFileProvider: FileProviderBasicRemote {
-    open class var type: String { return "OneDrive" }
-    open let baseURL: URL?
-    /// Drive name for user, default is `root`. Changing its value will effect on new operations.
-    open var drive: String
-    /// Generated storage url from server url and drive name
-    open var currentPath: String
-    
-    open var dispatch_queue: DispatchQueue
-    open var operation_queue: OperationQueue {
-        willSet {
-            assert(_session == nil, "It's not effective to change dispatch_queue property after session is initialized.")
-        }
-    }
-    
-    open weak var delegate: FileProviderDelegate?
-    open var credential: URLCredential? {
-        didSet {
-            sessionDelegate?.credential = self.credential
-        }
-    }
-    open private(set) var cache: URLCache?
-    public var useCache: Bool
-    public var validatingCache: Bool
-   
-    fileprivate var _session: URLSession?
-    fileprivate var sessionDelegate: SessionDelegate?
-    public var session: URLSession {
-        get {
-            if _session == nil {
-                self.sessionDelegate = SessionDelegate(fileProvider: self, credential: credential)
-                let queue = OperationQueue()
-                //queue.underlyingQueue = dispatch_queue
-                let config = URLSessionConfiguration.default
-                config.urlCache = cache
-                config.requestCachePolicy = .returnCacheDataElseLoad
-                _session = URLSession(configuration: config, delegate: sessionDelegate as URLSessionDelegate?, delegateQueue: queue)
-                _session?.sessionDescription = UUID().uuidString
-                initEmptySessionHandler(_session!.sessionDescription!)
-            }
-            return _session!
-        }
-        
-        set {
-            assert(newValue.delegate is SessionDelegate, "session instances should have a SessionDelegate instance as delegate.")
-            _session = newValue
-            if session.sessionDescription?.isEmpty ?? true {
-                _session?.sessionDescription = UUID().uuidString
-            }
-            initEmptySessionHandler(_session!.sessionDescription!)
-        }
-    }
-    
-    /**
-     Initializer for Onedrive provider with given client ID and Token.
-     These parameters must be retrieved via [Authentication for the OneDrive API](https://dev.onedrive.com/auth/readme.htm).
-     
-     There are libraries like [p2/OAuth2](https://github.com/p2/OAuth2) or [OAuthSwift](https://github.com/OAuthSwift/OAuthSwift) which can facilate the procedure to retrieve token.
-     The latter is easier to use and prefered. Also you can use [auth0/Lock](https://github.com/auth0/Lock.iOS-OSX) which provides graphical user interface.
-     
-     - Parameters:
-       - credential: a `URLCredential` object with Client ID set as `user` and Token set as `password`.
-       - serverURL: server url, Set it if you are trying to connect OneDrive Business server, otherwise leave it
-         `nil` to connect to OneDrive Personal uses.
-       - drive: drive name for user on server, default value is `root`.
-       - cache: A URLCache to cache downloaded files and contents.
-     */
-    public init(credential: URLCredential?, serverURL: URL? = nil, drive: String = "root", cache: URLCache? = nil) {
-        let baseURL = serverURL?.absoluteURL ?? URL(string: "https://api.onedrive.com/")!
-        self.baseURL = baseURL.path.hasSuffix("/") ? baseURL : baseURL.appendingPathComponent("")
-        self.drive = drive
-        self.currentPath = ""
-        self.useCache = false
-        self.validatingCache = true
-        self.cache = cache
-        self.credential = credential
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: .concurrent)
-        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
-    }
-    
-    public required convenience init?(coder aDecoder: NSCoder) {
-        self.init(credential: aDecoder.decodeObject(forKey: "credential") as? URLCredential,
-                  serverURL: aDecoder.decodeObject(forKey: "baseURL") as? URL,
-                  drive: aDecoder.decodeObject(forKey: "drive") as? String ?? "root")
-        self.currentPath   = aDecoder.decodeObject(forKey: "currentPath") as? String ?? ""
-        self.useCache = aDecoder.decodeBool(forKey: "useCache")
-        self.validatingCache = aDecoder.decodeBool(forKey: "validatingCache")
-    }
-    
-    open func encode(with aCoder: NSCoder) {
-        aCoder.encode(self.credential, forKey: "credential")
-        aCoder.encode(self.baseURL, forKey: "baseURL")
-        aCoder.encode(self.drive, forKey: "drive")
-        aCoder.encode(self.currentPath, forKey: "currentPath")
-        aCoder.encode(self.useCache, forKey: "useCache")
-        aCoder.encode(self.validatingCache, forKey: "validatingCache")
-    }
-    
-    public static var supportsSecureCoding: Bool {
-        return true
-    }
-    
-    open func copy(with zone: NSZone? = nil) -> Any {
-        let copy = OneDriveFileProvider(credential: self.credential, serverURL: self.baseURL, drive: self.drive, cache: self.cache)
-        copy.currentPath = self.currentPath
-        copy.delegate = self.delegate
-        copy.fileOperationDelegate = self.fileOperationDelegate
-        copy.useCache = self.useCache
-        copy.validatingCache = self.validatingCache
-        return copy
-    }
-    
-    deinit {
-        if let sessionuuid = _session?.sessionDescription {
-            removeSessionHandler(for: sessionuuid)
-        }
-        
-        if fileProviderCancelTasksOnInvalidating {
-            _session?.invalidateAndCancel()
-        } else {
-            _session?.finishTasksAndInvalidate()
-        }
-    }
-    
-    open func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
-        list(path) { (contents, cursor, error) in
-            completionHandler(contents, error)
-        }
-    }
-    
-    open func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
-        var request = URLRequest(url: url(of: path))
-        request.httpMethod = "GET"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var serverError: FileProviderOneDriveError?
-            var fileObject: OneDriveFileObject?
-            if let response = response as? HTTPURLResponse {
-                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
-                serverError = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
-                if let json = data?.deserializeJSON(), let file = OneDriveFileObject(baseURL: self.baseURL, drive: self.drive, json: json) {
-                    fileObject = file
-                }
-            }
-            completionHandler(fileObject, serverError ?? error)
-        }) 
-        task.resume()
-    }
-    
-    open func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
-        var request = URLRequest(url: url())
-        request.httpMethod = "GET"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var totalSize: Int64 = -1
-            var usedSize: Int64 = 0
-            if let json = data?.deserializeJSON() {
-                totalSize = (json["total"] as? NSNumber)?.int64Value ?? -1
-                usedSize = (json["used"] as? NSNumber)?.int64Value ?? 0
-            }
-            completionHandler(totalSize, usedSize)
-        }) 
-        task.resume()
-    }
-    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
-        var foundFiles = [OneDriveFileObject]()
-        var queryStr: String?
-        queryStr = query.findValue(forKey: "name") as? String ?? query.findAllValues(forKey: nil).flatMap { $0.value as? String }.first
-        guard let finalQueryStr = queryStr else { return }
-        search(path, query: finalQueryStr, foundItem: { (file) in
-            if query.evaluate(with: file.mapPredicate()) {
-                foundFiles.append(file)
-                foundItemHandler?(file)
-            }
-        }, completionHandler: { (error) in
-            completionHandler(foundFiles, error)
-        })
-    }
-    
-    open func url(of path: String? = nil, modifier: String? = nil) -> URL {
-        var rpath: String
-        if let path = path {
-            rpath = path
-        } else {
-            rpath = self.currentPath
-        }
-        
-        if rpath.hasPrefix("/") {
-            rpath.remove(at: rpath.startIndex)
-        }
-        if rpath.isEmpty {
-            if let modifier = modifier {
-                return baseURL!.appendingPathComponent("drive/\(drive)/\(modifier)")
-            }
-            return baseURL!.appendingPathComponent("drive/\(drive)")
-        }
-        let driveURL = baseURL!.appendingPathComponent("drive/\(drive):/")
-        rpath = (rpath.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? rpath)
-        rpath = rpath.trimmingCharacters(in: pathTrimSet)
-        if let modifier = modifier {
-            rpath = rpath + ":/" + modifier
-        }
-        return URL(string: rpath, relativeTo: driveURL) ?? driveURL
-    }
-    
-    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
-        var request = URLRequest(url: url())
-        request.httpMethod = "HEAD"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            let status = (response as? HTTPURLResponse)?.statusCode ?? 400
-            completionHandler(status == 200)
-        })
-        task.resume()
-    }
-    
-    open weak var fileOperationDelegate: FileOperationDelegate?
-}
-
-extension OneDriveFileProvider: FileProviderOperations {
-    
-    
-    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let path = (atPath as NSString).appendingPathComponent(folderName) + "/"
-        return doOperation(.create(path: path), completionHandler: completionHandler)
-    }
-    
-    open func moveItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        return doOperation(.move(source: path, destination: toPath), completionHandler: completionHandler)
-    }
-    
-    open func copyItem(path: String, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        return doOperation(.copy(source: path, destination: toPath), completionHandler: completionHandler)
-    }
-    
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        return doOperation(.remove(path: path), completionHandler: completionHandler)
-    }
-    
-    fileprivate func doOperation(_ operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: operation) ?? true == true else {
-            return nil
-        }
-        guard let sourcePath = operation.source else { return nil }
-        let destPath = operation.destination
-        var request = URLRequest(url: url(of: sourcePath))
-        switch operation {
-        case .create:
-            request.httpMethod = "CREATE"
-        case .copy:
-            request.httpMethod = "POST"
-        case .move:
-            request.httpMethod = "PATCH"
-        case .remove:
-            request.httpMethod = "DELETE"
-        default: // modify, link, fetch
-            return nil
-        }
-        
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        var requestDictionary = [String: AnyObject]()
-        if let dest = correctPath(destPath) as NSString? {
-            request.setValue("application/json", forHTTPHeaderField: "Content-Type")
-            requestDictionary["parentReference"] = ("/drive/\(drive):" + dest.deletingLastPathComponent) as NSString
-            requestDictionary["name"] = dest.lastPathComponent as NSString
-            request.httpBody = Data(jsonDictionary: requestDictionary)
-        }
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var serverError: FileProviderOneDriveError?
-            if let response = response as? HTTPURLResponse, response.statusCode >= 300, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) {
-                 serverError = FileProviderOneDriveError(code: code, path: sourcePath, errorDescription: String(data: data ?? Data(), encoding: .utf8))
-            }
-            completionHandler?(serverError ?? error)
-            self.delegateNotify(operation, error: serverError ?? error)
-        })
-        task.taskDescription = operation.json
-        task.resume()
-        return RemoteOperationHandle(operationType: operation, tasks: [task])
-    }
-    
-    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: localFile.absoluteString, destination: toPath)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        return upload_simple(toPath, localFile: localFile, overwrite: overwrite, operation: opType, completionHandler: completionHandler)
-    }
-    
-    open func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: path, destination: destURL.absoluteString)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        var request = URLRequest(url: self.url(of: path, modifier: "content"))
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = completionHandler
-        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
-            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
-                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
-                let errorData : Data? = nil //Data(contentsOf: cacheURL) // TODO: Figure out how to get error response data for the error description
-                let serverError : FileProviderOneDriveError? = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: errorData ?? Data(), encoding: .utf8)) : nil
-                completionHandler?(serverError)
-                return
-            }
-            do {
-                try FileManager.default.moveItem(at: tempURL, to: destURL)
-                completionHandler?(nil)
-            } catch let e {
-                completionHandler?(e)
-            }
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
-    }
-}
-
-extension OneDriveFileProvider: FileProviderReadWrite {
-    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
-        if length == 0 || offset < 0 {
-            dispatch_queue.async {
-                completionHandler(Data(), nil)
-            }
-            return nil
-        }
-        
-        let opType = FileOperationType.fetch(path: path)
-        var request = URLRequest(url: self.url(of: path, modifier: "content"))
-        request.httpMethod = "GET"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        if length > 0 {
-            request.setValue("bytes=\(offset)-\(offset + Int64(length) - 1)", forHTTPHeaderField: "Range")
-        } else if offset > 0 && length < 0 {
-            request.setValue("bytes=\(offset)-", forHTTPHeaderField: "Range")
-        }
-        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
-            completionHandler(nil, error)
-        }
-        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
-            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
-                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
-                let errorData : Data? = nil //Data(contentsOf: cacheURL) // TODO: Figure out how to get error response data for the error description
-                let serverError : FileProviderOneDriveError? = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: errorData ?? Data(), encoding: .utf8)) : nil
-                completionHandler(nil, serverError)
-                return
-            }
-            do {
-                let data = try Data(contentsOf: tempURL)
-                completionHandler(data, nil)
-            } catch let e {
-                completionHandler(nil, e)
-            }
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
-    }
-    
-    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.modify(path: path)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        // FIXME: remove 150MB restriction
-        return upload_simple(path, data: data ?? Data(), overwrite: overwrite, operation: opType, completionHandler: completionHandler)
-    }
-    
-    fileprivate func registerNotifcation(path: String, eventHandler: (() -> Void)) {
-        /* There is two ways to monitor folders changing in OneDrive. Either using webooks
-         * which means you have to implement a server to translate it to push notifications
-         * or using apiv2 list_folder/longpoll method. The second one is implemeted here.
-         * Tough webhooks are much more efficient, longpoll is much simpler to implement!
-         * You can implemnt your own webhook service and replace this method accordingly.
-         */
-        NotImplemented()
-    }
-    fileprivate func unregisterNotifcation(path: String) {
-        NotImplemented()
-    }
-    
-    /**
-     Genrates a public url to a file to be shared with other users and can be downloaded without authentication.
-     
-     - Parameters:
-       - to: path of file, including file/directory name.
-       - completionHandler: a closure with result of directory entries or error.
-         `link`: a url returned by OneDrive to share.
-         `attribute`: `nil` for OneDrive.
-         `expiration`: `nil` for OneDrive, as it doesn't expires.
-         `error`: Error returned by OneDrive.
-     */
-    open func publicLink(to path: String, completionHandler: @escaping ((_ link: URL?, _ attribute: OneDriveFileObject?, _ expiration: Date?, _ error: Error?) -> Void)) {
-        var request = URLRequest(url: self.url(of: path, modifier: "action.createLink"))
-        request.httpMethod = "POST"
-        let requestDictionary: [String: AnyObject] = ["type": "view" as NSString]
-        request.httpBody = Data(jsonDictionary: requestDictionary)
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var serverError: FileProviderOneDriveError?
-            var link: URL?
-            if let response = response as? HTTPURLResponse {
-                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
-                serverError = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
-                if let json = data?.deserializeJSON() {
-                    if let linkDic = json["link"] as? NSDictionary, let linkStr = linkDic["webUrl"] as? String {
-                        link = URL(string: linkStr)
-                    }
-                }
-            }
-            
-            completionHandler(link, nil, nil, serverError ?? error)
-        })
-        task.resume()
-    }
-}
-
-
-extension OneDriveFileProvider: ExtendedFileProvider {
-    open func thumbnailOfFileSupported(path: String) -> Bool {
-        return true
-    }
-    
-    open func propertiesOfFileSupported(path: String) -> Bool {
-        let fileExt = (path as NSString).pathExtension.lowercased()
-        switch fileExt {
-        case "jpg", "jpeg", "bmp", "gif", "png", "tif", "tiff":
-            return true
-        case "mp3", "aac", "m4a", "wma":
-            return true
-        case "mp4", "mpg", "3gp", "mov", "avi", "wmv":
-            return true
-        default:
-            return false
-        }
-    }
-    
-    open func thumbnailOfFile(path: String, dimension: CGSize?, completionHandler: @escaping ((_ image: ImageClass?, _ error: Error?) -> Void)) {
-        let url: URL
-        if let dimension = dimension {
-            url = self.url(of: path, modifier: "thumbnails/0/=c\(dimension.width)x\(dimension.height)/content")
-        } else {
-            url =  self.url(of: path, modifier: "thumbnails/0/small/content")
-        }
-        
-        var request = URLRequest(url: url)
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let task = self.session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var image: ImageClass? = nil
-            if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
-                let responseError = FileProviderOneDriveError(code: rCode, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8))
-                completionHandler(nil, responseError)
-                return
-            }
-            if let data = data {
-                image = ImageClass(data: data)
-            }
-            completionHandler(image, error)
-        })
-        task.resume()
-    }
-    
-    open func propertiesOfFile(path: String, completionHandler: @escaping ((_ propertiesDictionary: [String : Any], _ keys: [String], _ error: Error?) -> Void)) {
-        var request = URLRequest(url: url(of: path))
-        request.httpMethod = "GET"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var serverError: FileProviderOneDriveError?
-            var dic = [String: Any]()
-            var keys = [String]()
-            if let response = response as? HTTPURLResponse {
-                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
-                serverError = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
-                if let json = data?.deserializeJSON() {
-                    (dic, keys) = self.mapMediaInfo(json)
-                }
-            }
-            completionHandler(dic, keys, serverError ?? error)
-        })
-        task.resume()
-    }
-}
-
-extension OneDriveFileProvider: FileProvider { }
@@ -0,0 +1,336 @@
+
+//
+//  OneDriveFileProvider.swift
+//  FileProvider
+//
+//  Created by Amir Abbas Mousavian.
+//  Copyright © 2017 Mousavian. Distributed under MIT license.
+//
+
+import Foundation
+import CoreGraphics
+
+/**
+ Allows accessing to OneDrive stored files, either hosted on Microsoft servers or business coprporate one.
+ This provider doesn't cache or save files internally, however you can set `useCache` and `cache` properties
+ to use Foundation `NSURLCache` system.
+ 
+ - Note: Uploading files and data are limited to 100MB, for now.
+ */
+open class OneDriveFileProvider: HTTPFileProvider {
+    override open class var type: String { return "OneDrive" }
+    /// Drive name for user, default is `root`. Changing its value will effect on new operations.
+    open var drive: String
+    
+    /**
+     Initializer for Onedrive provider with given client ID and Token.
+     These parameters must be retrieved via [Authentication for the OneDrive API](https://dev.onedrive.com/auth/readme.htm).
+     
+     There are libraries like [p2/OAuth2](https://github.com/p2/OAuth2) or [OAuthSwift](https://github.com/OAuthSwift/OAuthSwift) which can facilate the procedure to retrieve token.
+     The latter is easier to use and prefered. Also you can use [auth0/Lock](https://github.com/auth0/Lock.iOS-OSX) which provides graphical user interface.
+     
+     - Parameters:
+       - credential: a `URLCredential` object with Client ID set as `user` and Token set as `password`.
+       - serverURL: server url, Set it if you are trying to connect OneDrive Business server, otherwise leave it
+         `nil` to connect to OneDrive Personal uses.
+       - drive: drive name for user on server, default value is `root`.
+       - cache: A URLCache to cache downloaded files and contents.
+     */
+    public init(credential: URLCredential?, serverURL: URL? = nil, drive: String = "root", cache: URLCache? = nil) {
+        let baseURL = serverURL?.absoluteURL ?? URL(string: "https://api.onedrive.com/")!
+        let refinedBaseURL = baseURL.absoluteString.hasSuffix("/") ? baseURL : baseURL.appendingPathComponent("")
+        self.drive = drive
+        super.init(baseURL: refinedBaseURL, credential: credential, cache: cache)
+    }
+    
+    public required convenience init?(coder aDecoder: NSCoder) {
+        self.init(credential: aDecoder.decodeObject(forKey: "credential") as? URLCredential,
+                  serverURL: aDecoder.decodeObject(forKey: "baseURL") as? URL,
+                  drive: aDecoder.decodeObject(forKey: "drive") as? String ?? "root")
+        self.currentPath   = aDecoder.decodeObject(forKey: "currentPath") as? String ?? ""
+        self.useCache = aDecoder.decodeBool(forKey: "useCache")
+        self.validatingCache = aDecoder.decodeBool(forKey: "validatingCache")
+    }
+    
+    open override func encode(with aCoder: NSCoder) {
+        super.encode(with: aCoder)
+        aCoder.encode(self.drive, forKey: "drive")
+    }
+    
+    open override func copy(with zone: NSZone? = nil) -> Any {
+        let copy = OneDriveFileProvider(credential: self.credential, serverURL: self.baseURL, drive: self.drive, cache: self.cache)
+        copy.currentPath = self.currentPath
+        copy.delegate = self.delegate
+        copy.fileOperationDelegate = self.fileOperationDelegate
+        copy.useCache = self.useCache
+        copy.validatingCache = self.validatingCache
+        return copy
+    }
+    
+    open override func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
+        list(path) { (contents, cursor, error) in
+            completionHandler(contents, error)
+        }
+    }
+    
+    open override func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
+        var request = URLRequest(url: url(of: path))
+        request.httpMethod = "GET"
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var serverError: FileProviderOneDriveError?
+            var fileObject: OneDriveFileObject?
+            if let response = response as? HTTPURLResponse {
+                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
+                serverError = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
+                if let json = data?.deserializeJSON(), let file = OneDriveFileObject(baseURL: self.baseURL, drive: self.drive, json: json) {
+                    fileObject = file
+                }
+            }
+            completionHandler(fileObject, serverError ?? error)
+        }) 
+        task.resume()
+    }
+    
+    open override func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
+        var request = URLRequest(url: url())
+        request.httpMethod = "GET"
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var totalSize: Int64 = -1
+            var usedSize: Int64 = 0
+            if let json = data?.deserializeJSON() {
+                totalSize = (json["total"] as? NSNumber)?.int64Value ?? -1
+                usedSize = (json["used"] as? NSNumber)?.int64Value ?? 0
+            }
+            completionHandler(totalSize, usedSize)
+        }) 
+        task.resume()
+    }
+    
+    open override func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
+        var foundFiles = [OneDriveFileObject]()
+        var queryStr: String?
+        queryStr = query.findValue(forKey: "name") as? String ?? query.findAllValues(forKey: nil).flatMap { $0.value as? String }.first
+        guard let finalQueryStr = queryStr else { return nil }
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(url(of: path), forKey: .fileURLKey)
+        search(path, query: finalQueryStr, progress: progress, foundItem: { (file) in
+            if query.evaluate(with: file.mapPredicate()) {
+                foundFiles.append(file)
+                foundItemHandler?(file)
+            }
+        }, completionHandler: { (error) in
+            completionHandler(foundFiles, error)
+        })
+        return progress
+    }
+    
+    open func url(of path: String? = nil, modifier: String? = nil) -> URL {
+        var rpath: String
+        if let path = path {
+            rpath = path
+        } else {
+            rpath = self.currentPath
+        }
+        
+        let driveURL = baseURL!.appendingPathComponent("drive/\(drive):/")
+        
+        if rpath.hasPrefix("/") {
+            _=rpath.characters.removeFirst()
+        }
+        if rpath.isEmpty {
+            if let modifier = modifier {
+                return driveURL.appendingPathComponent(modifier)
+            }
+            return driveURL
+        }
+        
+        rpath = rpath.trimmingCharacters(in: pathTrimSet)
+        if let modifier = modifier {
+            rpath = rpath + ":/" + modifier
+        }
+        
+        return  driveURL.appendingPathComponent(rpath)
+    }
+    
+    open override func isReachable(completionHandler: @escaping (Bool) -> Void) {
+        var request = URLRequest(url: url())
+        request.httpMethod = "HEAD"
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            let status = (response as? HTTPURLResponse)?.statusCode ?? 400
+            completionHandler(status == 200)
+        })
+        task.resume()
+    }
+    
+    override func request(for operation: FileOperationType, overwrite: Bool = false, attributes: [URLResourceKey : Any] = [:]) -> URLRequest {
+        let method: String
+        let url: URL
+        switch operation {
+        case .fetch(path: let path):
+            method = "GET"
+            url = self.url(of: path, modifier: "content")
+        case .modify(path: let path):
+            method = "PUT"
+            let queryStr = overwrite ? "" : "?@name.conflictBehavior=fail"
+            url = self.url(of: path, modifier: "content\(queryStr)")
+        case .create(path: let path):
+            method = "CREATE"
+            url = self.url(of: path)
+        case .copy(let source, let dest) where !source.hasPrefix("file://") && !dest.hasPrefix("file://"):
+            method = "POST"
+            url = self.url(of: source)
+        case .copy(let source, let dest) where source.hasPrefix("file://"):
+            method = "PUT"
+            let queryStr = overwrite ? "" : "?@name.conflictBehavior=fail"
+            url = self.url(of: dest, modifier: "content\(queryStr)")
+        case .copy(let source, let dest) where dest.hasPrefix("file://"):
+            method = "GET"
+            url = self.url(of: source, modifier: "content")
+        case .move(source: let source, destination: _):
+            method = "PATCH"
+            url = self.url(of: source)
+        case .remove(path: let path):
+            method = "DELETE"
+            url = self.url(of: path)
+        default: // link
+            fatalError("Unimplemented operation \(operation.description) in \(#file)")
+        }
+        var request = URLRequest(url: url)
+        request.httpMethod = method
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        if let dest = correctPath(operation.destination) as NSString?, !dest.hasPrefix("file://") {
+            request.set(contentType: .json)
+            var requestDictionary = [String: AnyObject]()
+            requestDictionary["parentReference"] = ("/drive/\(drive):" + dest.deletingLastPathComponent) as NSString
+            requestDictionary["name"] = dest.lastPathComponent as NSString
+            request.httpBody = Data(jsonDictionary: requestDictionary)
+        }
+        
+        return request
+    }
+    
+    override func serverError(with code: FileProviderHTTPErrorCode, path: String?, data: Data?) -> FileProviderHTTPError {
+        return FileProviderOneDriveError(code: code, path: path ?? "", errorDescription:  data.flatMap({ String(data: $0, encoding: .utf8) }))
+    }
+    
+    override func upload_simple(_ targetPath: String, request: URLRequest, data: Data?, localFile: URL?, operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> Progress? {
+        let size = data?.count ?? Int((try? localFile?.resourceValues(forKeys: [.fileSizeKey]))??.fileSize ?? -1)
+        if size > 100 * 1024 * 1024 {
+            let error = FileProviderOneDriveError(code: .payloadTooLarge, path: targetPath, errorDescription: nil)
+            completionHandler?(error)
+            self.delegateNotify(operation, error: error)
+            return nil
+        }
+        
+        return super.upload_simple(targetPath, request: request, data: data, localFile: localFile, operation: operation, completionHandler: completionHandler)
+    }
+}
+
+extension OneDriveFileProvider {
+    fileprivate func registerNotifcation(path: String, eventHandler: (() -> Void)) {
+        /* There is two ways to monitor folders changing in OneDrive. Either using webooks
+         * which means you have to implement a server to translate it to push notifications
+         * or using apiv2 list_folder/longpoll method. The second one is implemeted here.
+         * Tough webhooks are much more efficient, longpoll is much simpler to implement!
+         * You can implemnt your own webhook service and replace this method accordingly.
+         */
+        NotImplemented()
+    }
+    fileprivate func unregisterNotifcation(path: String) {
+        NotImplemented()
+    }
+}
+
+extension OneDriveFileProvider: FileProviderSharing {
+    open func publicLink(to path: String, completionHandler: @escaping ((_ link: URL?, _ attribute: FileObject?, _ expiration: Date?, _ error: Error?) -> Void)) {
+        var request = URLRequest(url: self.url(of: path, modifier: "action.createLink"))
+        request.httpMethod = "POST"
+        let requestDictionary: [String: AnyObject] = ["type": "view" as NSString]
+        request.httpBody = Data(jsonDictionary: requestDictionary)
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var serverError: FileProviderOneDriveError?
+            var link: URL?
+            if let response = response as? HTTPURLResponse {
+                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
+                serverError = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
+                if let json = data?.deserializeJSON() {
+                    if let linkDic = json["link"] as? NSDictionary, let linkStr = linkDic["webUrl"] as? String {
+                        link = URL(string: linkStr)
+                    }
+                }
+            }
+            
+            completionHandler(link, nil, nil, serverError ?? error)
+        })
+        task.resume()
+    }
+}
+
+
+extension OneDriveFileProvider: ExtendedFileProvider {
+    open func thumbnailOfFileSupported(path: String) -> Bool {
+        return true
+    }
+    
+    open func propertiesOfFileSupported(path: String) -> Bool {
+        let fileExt = (path as NSString).pathExtension.lowercased()
+        switch fileExt {
+        case "jpg", "jpeg", "bmp", "gif", "png", "tif", "tiff":
+            return true
+        case "mp3", "aac", "m4a", "wma":
+            return true
+        case "mp4", "mpg", "3gp", "mov", "avi", "wmv":
+            return true
+        default:
+            return false
+        }
+    }
+    
+    open func thumbnailOfFile(path: String, dimension: CGSize?, completionHandler: @escaping ((_ image: ImageClass?, _ error: Error?) -> Void)) {
+        let url: URL
+        if let dimension = dimension {
+            url = self.url(of: path, modifier: "thumbnails/0/=c\(dimension.width)x\(dimension.height)/content")
+        } else {
+            url =  self.url(of: path, modifier: "thumbnails/0/small/content")
+        }
+        
+        var request = URLRequest(url: url)
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        let task = self.session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var image: ImageClass? = nil
+            if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
+                let responseError = FileProviderOneDriveError(code: rCode, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8))
+                completionHandler(nil, responseError)
+                return
+            }
+            if let data = data {
+                image = ImageClass(data: data)
+            }
+            completionHandler(image, error)
+        })
+        task.resume()
+    }
+    
+    open func propertiesOfFile(path: String, completionHandler: @escaping ((_ propertiesDictionary: [String : Any], _ keys: [String], _ error: Error?) -> Void)) {
+        var request = URLRequest(url: url(of: path))
+        request.httpMethod = "GET"
+        request.set(httpAuthentication: credential, with: .oAuth2)
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var serverError: FileProviderOneDriveError?
+            var dic = [String: Any]()
+            var keys = [String]()
+            if let response = response as? HTTPURLResponse {
+                let code = FileProviderHTTPErrorCode(rawValue: response.statusCode)
+                serverError = code != nil ? FileProviderOneDriveError(code: code!, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8)) : nil
+                if let json = data?.deserializeJSON() {
+                    (dic, keys) = self.mapMediaInfo(json)
+                }
+            }
+            completionHandler(dic, keys, serverError ?? error)
+        })
+        task.resume()
+    }
+}
@@ -18,12 +18,13 @@ public struct FileProviderOneDriveError: FileProviderHTTPError {
 /// Containts path, url and attributes of a OneDrive file or resource.
 public final class OneDriveFileObject: FileObject {
    internal init(baseURL: URL?, name: String, path: String) {
-        var rpath = path
-        if path.hasPrefix("/") {
-            rpath.remove(at: rpath.startIndex)
+        var rpath = (URL(string:path)?.appendingPathComponent(name).absoluteString)!
+        if rpath.hasPrefix("/") {
+            _=rpath.characters.removeFirst()
        }
-        let url = URL(string: rpath, relativeTo: baseURL) ?? URL(string: path)!
-        super.init(url: url, name: name, path: path)
+        let url = URL(string: rpath, relativeTo: baseURL) ?? URL(string: rpath)!
+        
+        super.init(url: url, name: name, path: rpath.removingPercentEncoding ?? path)
    }
    
    internal convenience init? (baseURL: URL?, drive: String, jsonStr: String) {
@@ -34,14 +35,14 @@ public final class OneDriveFileObject: FileObject {
    internal convenience init? (baseURL: URL?, drive: String, json: [String: AnyObject]) {
        guard let name = json["name"] as? String else { return nil }
        guard let path = (json["parentReference"] as? NSDictionary)?["path"] as? String else { return nil }
-        var lPath = path.replacingOccurrences(of: "/drive/\(drive)", with: "/", options: .anchored, range: nil)
+        var lPath = path.replacingOccurrences(of: "/drive/\(drive):", with: "/", options: .anchored, range: nil)
        lPath = lPath.replacingOccurrences(of: "/:", with: "", options: .anchored)
        lPath = lPath.replacingOccurrences(of: "//", with: "", options: .anchored)
        self.init(baseURL: baseURL, name: name, path: lPath)
        self.size = (json["size"] as? NSNumber)?.int64Value ?? -1
        self.modifiedDate = Date(rfcString: json["lastModifiedDateTime"] as? String ?? "")
        self.creationDate = Date(rfcString: json["createdDateTime"] as? String ?? "")
-        self.type = (json["folder"] as? String) != nil ? .directory : .regular
+        self.type = json["folder"] != nil ? .directory : .regular
        self.id = json["id"] as? String
        self.entryTag = json["eTag"] as? String
    }
@@ -85,7 +86,7 @@ internal extension OneDriveFileProvider {
        let url = cursor ?? self.url(of: path, modifier: "children")
        var request = URLRequest(url: url)
        request.httpMethod = "GET"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
+        request.set(httpAuthentication: credential, with: .oAuth2)
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
            var responseError: FileProviderOneDriveError?
            var files = prevContents
@@ -113,50 +114,17 @@ internal extension OneDriveFileProvider {
        task.resume()
    }
    
-    func upload_simple(_ targetPath: String, data: Data? = nil , localFile: URL? = nil, modifiedDate: Date = Date(), overwrite: Bool, operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let size = data?.count ?? (try? localFile?.resourceValues(forKeys: [.fileSizeKey]))??.fileSize ?? -1
-        if size > 100 * 1024 * 1024 {
-            let error = FileProviderOneDriveError(code: .payloadTooLarge, path: targetPath, errorDescription: nil)
-            completionHandler?(error)
-            self.delegateNotify(.create(path: targetPath), error: error)
-            return nil
-        }
-        let queryStr = overwrite ? "" : "?@name.conflictBehavior=fail"
-        let url = self.url(of: targetPath, modifier: "content\(queryStr)")
-        var request = URLRequest(url: url)
-        request.httpMethod = "PUT"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
-        request.setValue("application/octet-stream", forHTTPHeaderField: "Content-Type")
-        let task: URLSessionUploadTask
-        if let data = data {
-            task = session.uploadTask(with: request, from: data)
-        } else if  let localFile = localFile {
-            task = session.uploadTask(with: request, fromFile: localFile)
-        } else {
-            return nil
+    func search(_ startPath: String = "", query: String, next: URL? = nil, progress: Progress, foundItem: @escaping ((_ file: OneDriveFileObject) -> Void), completionHandler: @escaping ((_ error: Error?) -> Void)) {
+        if progress.isCancelled {
+            return
        }
        
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { [weak self] error in
-            var responseError: FileProviderOneDriveError?
-            if let code = (task.response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
-                // We can't fetch server result from delegate!
-                responseError = FileProviderOneDriveError(code: rCode, path: targetPath, errorDescription: nil)
-            }
-            completionHandler?(responseError ?? error)
-            self?.delegateNotify(.create(path: targetPath), error: responseError ?? error)
-        }
-        task.taskDescription = operation.json
-        task.resume()
-        return RemoteOperationHandle(operationType: operation, tasks: [task])
-    }
-    
-    func search(_ startPath: String = "", query: String, next: URL? = nil, foundItem:@escaping ((_ file: OneDriveFileObject) -> Void), completionHandler: @escaping ((_ error: Error?) -> Void)) {
        let url: URL
        let q = query.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
        url = next ?? self.url(of: startPath, modifier: "view.search?q=\(q)")
        var request = URLRequest(url: url)
        request.httpMethod = "GET"
-        request.setValue("Bearer \(credential?.password ?? "")", forHTTPHeaderField: "Authorization")
+        request.set(httpAuthentication: credential, with: .oAuth2)
        
        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
            var responseError: FileProviderOneDriveError?
@@ -171,8 +139,8 @@ internal extension OneDriveFileProvider {
                        }
                    }
                    let next: URL? = (json["@odata.nextLink"] as? String).flatMap { URL(string: $0) }
-                    if let next = next {
-                        self.search(startPath, query: query, next: next, foundItem: foundItem, completionHandler: completionHandler)
+                    if !progress.isCancelled, let next = next {
+                        self.search(startPath, query: query, next: next, progress: progress, foundItem: foundItem, completionHandler: completionHandler)
                    } else {
                        completionHandler(responseError ?? error)
                    }
@@ -180,7 +148,11 @@ internal extension OneDriveFileProvider {
                }
            }
            completionHandler(responseError ?? error)
-        }) 
+        })
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
        task.resume()
    }
 }
@@ -258,14 +230,4 @@ internal extension OneDriveFileProvider {
        
        return (dic, keys)
    }
-    
-    func delegateNotify(_ operation: FileOperationType, error: Error?) {
-        DispatchQueue.main.async(execute: {
-            if error == nil {
-                self.delegate?.fileproviderSucceed(self, operation: operation)
-            } else {
-                self.delegate?.fileproviderFailed(self, operation: operation)
-            }
-        })
-    }
 }
@@ -8,70 +8,11 @@

 import Foundation

-/// Allows to get progress or cancel an in-progress operation, for remote, `URLSession` based providers.
-/// This class keeps strong reference to tasks.
-open class RemoteOperationHandle: OperationHandle {
-    
-    internal var tasks: [URLSessionTask]
-    
-    open private(set) var operationType: FileOperationType
-    
-    init(operationType: FileOperationType, tasks: [URLSessionTask]) {
-        self.operationType = operationType
-        self.tasks = tasks
-    }
-    
-    internal func add(task: URLSessionTask) {
-        tasks.append(task)
-    }
-    
-    internal func reape() {
-        self.tasks = tasks.filter { $0.state != .completed }
-    }
-    
-    open var bytesSoFar: Int64 {
-        return tasks.reduce(0) {
-            switch $1 {
-            case let task as URLSessionUploadTask:
-                return $0 + task.countOfBytesSent
-            case let task as FileProviderStreamTask:
-                return $0 + task.countOfBytesSent + task.countOfBytesReceived
-            default:
-                return $0 + $1.countOfBytesReceived
-            }
-        }
-    }
-    
-    open var totalBytes: Int64 {
-        return tasks.reduce(0) {
-            switch $1 {
-            case let task as URLSessionUploadTask:
-                return $0 + task.countOfBytesExpectedToSend
-            case let task as FileProviderStreamTask:
-                return $0 + task.countOfBytesExpectedToSend + task.countOfBytesExpectedToReceive
-            default:
-                return $0 + $1.countOfBytesExpectedToReceive
-            }
-        }
-    }
-    
-    open func cancel() -> Bool {
-        var canceled = false
-        for taskbox in tasks {
-            taskbox.cancel()
-            canceled = true
-        }
-        return canceled
-    }
-    
-    open var inProgress: Bool {
-        return tasks.reduce(false) { $0 || $1.state == .running }
-    }
-}
-
 /// A protocol defines properties for errors returned by HTTP/S based providers.
 /// Including Dropbox, OneDrive and WebDAV.
 public protocol FileProviderHTTPError: Error, CustomStringConvertible {
+    /// HTTP status codes as an enum.
+    typealias Code = FileProviderHTTPErrorCode
    /// HTTP status code returned for error by server.
    var code: FileProviderHTTPErrorCode { get }
    /// Path of file/folder casued that error
@@ -90,6 +31,18 @@ extension FileProviderHTTPError {
    }
 }

+/// Defines HTTP Authentication method required to access
+public enum HTTPAuthenticationType {
+    /// Basic method for authentication
+    case basic
+    /// Digest method for authentication
+    case digest
+    /// OAuth 1.0 method for authentication (OAuth)
+    case oAuth1
+    /// OAuth 2.0 method for authentication (Bearer)
+    case oAuth2
+}
+
 internal var completionHandlersForTasks = [String: [Int: SimpleCompletionHandler]]()
 internal var downloadCompletionHandlersForTasks = [String: [Int: (URL) -> Void]]()
 internal var dataCompletionHandlersForTasks = [String: [Int: (Data) -> Void]]()
@@ -101,9 +54,9 @@ internal func initEmptySessionHandler(_ uuid: String) {
 }

 internal func removeSessionHandler(for uuid: String) {
-    completionHandlersForTasks.removeValue(forKey: uuid)
-    downloadCompletionHandlersForTasks.removeValue(forKey: uuid)
-    dataCompletionHandlersForTasks.removeValue(forKey: uuid)
+    _ = completionHandlersForTasks.removeValue(forKey: uuid)
+    _ = downloadCompletionHandlersForTasks.removeValue(forKey: uuid)
+    _ = dataCompletionHandlersForTasks.removeValue(forKey: uuid)
 }

 /// All objects set to `FileProviderRemote.session` must be an instance of this class
@@ -121,17 +74,60 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
    /// Forwardng URLSessionStreamTaskDelegate call
    public var didBecomeStream :((_ session: URLSession, _ taskId: Int, _ didBecome: InputStream, _ outputStream: OutputStream) -> Void)?
    
-    init(fileProvider: FileProviderBasicRemote & FileProviderOperations, credential: URLCredential?) {
+    public init(fileProvider: FileProviderBasicRemote & FileProviderOperations) {
        self.fileProvider = fileProvider
-        self.credential = credential
+        self.credential = fileProvider.credential
+    }
+    
+    open override func observeValue(forKeyPath keyPath: String?, of object: Any?, change: [NSKeyValueChangeKey : Any]?, context: UnsafeMutableRawPointer?) {
+        if let progress = context?.load(as: Progress.self), let newVal = change?[.newKey] as? Int64 {
+            switch keyPath ?? "" {
+            case #keyPath(URLSessionTask.countOfBytesReceived):
+                progress.completedUnitCount = newVal
+                if let startTime = progress.userInfo[ProgressUserInfoKey.startingTimeKey] as? Date, let task = object as? URLSessionTask {
+                    let elapsed = Date().timeIntervalSince(startTime)
+                    let throughput = Double(newVal) / elapsed
+                    progress.setUserInfoObject(NSNumber(value: throughput), forKey: .throughputKey)
+                    if task.countOfBytesExpectedToReceive > 0 {
+                        let remain = task.countOfBytesExpectedToReceive - task.countOfBytesReceived
+                        let estimatedTimeRemaining = Double(remain) / elapsed
+                        progress.setUserInfoObject(NSNumber(value: estimatedTimeRemaining), forKey: .estimatedTimeRemainingKey)
+                    }
+                }
+            case #keyPath(URLSessionTask.countOfBytesSent):
+                progress.completedUnitCount = newVal
+                if let startTime = progress.userInfo[ProgressUserInfoKey.startingTimeKey] as? Date, let task = object as? URLSessionTask {
+                    let elapsed = Date().timeIntervalSince(startTime)
+                    let throughput = Double(newVal) / elapsed
+                    progress.setUserInfoObject(NSNumber(value: throughput), forKey: .throughputKey)
+                    if task.countOfBytesExpectedToSend > 0 {
+                        let remain = task.countOfBytesExpectedToSend - task.countOfBytesSent
+                        let estimatedTimeRemaining = Double(remain) / elapsed
+                        progress.setUserInfoObject(NSNumber(value: estimatedTimeRemaining), forKey: .estimatedTimeRemainingKey)
+                    }
+                }
+            case #keyPath(URLSessionTask.countOfBytesExpectedToReceive), #keyPath(URLSessionTask.countOfBytesExpectedToSend):
+                progress.totalUnitCount = newVal
+            default:
+                super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
+            }
+        }
    }
    
    // codebeat:disable[ARITY]
    public func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
+        if task is URLSessionDownloadTask {
+            task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesReceived))
+            task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesExpectedToReceive))
+        }
+        if task is URLSessionUploadTask {
+            task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesSent))
+            //task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesExpectedToSend))
+        }
        if !(error == nil && task is URLSessionDownloadTask) {
            let completionHandler = completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] ?? nil
            completionHandler?(error)
-            completionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: task.taskIdentifier)
+            _ = completionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: task.taskIdentifier)
        }
        
        guard let json = task.taskDescription?.deserializeJSON(),
@@ -139,6 +135,15 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
                return
        }
        
+        if !(task is URLSessionDownloadTask), case FileOperationType.fetch = op {
+            return
+        }
+        if #available(iOS 9.0, macOS 10.11, *) {
+            if task is URLSessionStreamTask {
+                return
+            }
+        }
+        
        DispatchQueue.main.async {
            if error != nil {
                fileProvider.delegate?.fileproviderFailed(fileProvider, operation: op)
@@ -151,7 +156,7 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
    public func urlSession(_ session: URLSession, dataTask: URLSessionDataTask, didReceive data: Data) {
        let completionHandler = dataCompletionHandlersForTasks[session.sessionDescription!]?[dataTask.taskIdentifier] ?? nil
        completionHandler?(data)
-        dataCompletionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: dataTask.taskIdentifier)
+        _ = dataCompletionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: dataTask.taskIdentifier)
    }
    
    public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL) {
@@ -159,8 +164,8 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
        
        let dcompletionHandler = downloadCompletionHandlersForTasks[session.sessionDescription!]?[downloadTask.taskIdentifier]
        dcompletionHandler?(location)
-        downloadCompletionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: downloadTask.taskIdentifier)
-        completionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: downloadTask.taskIdentifier)
+        _ = downloadCompletionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: downloadTask.taskIdentifier)
+        _ = completionHandlersForTasks[session.sessionDescription!]?.removeValue(forKey: downloadTask.taskIdentifier)
    }
    
    public func urlSession(_ session: URLSession, task: URLSessionTask, didSendBodyData bytesSent: Int64, totalBytesSent: Int64, totalBytesExpectedToSend: Int64) {
@@ -171,6 +176,18 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
            return
        }
        
+        switch op {
+        case .create(path: let path):
+            if path.hasSuffix("/") { return }
+            break
+        case .modify:
+            break
+        case .copy(source: let source, destination: _) where source.hasPrefix("file://"):
+            break
+        default:
+            return
+        }
+        
        let progress = Float(totalBytesSent) / Float(totalBytesExpectedToSend)
        
        DispatchQueue.main.async {
@@ -181,6 +198,8 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
    public func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64) {
        self.didReceivedData?(session, downloadTask, bytesWritten, totalBytesWritten, totalBytesExpectedToWrite)
        
+        if totalBytesExpectedToWrite == NSURLSessionTransferSizeUnknown { return }
+        
        guard let json = downloadTask.taskDescription?.deserializeJSON(),
              let op = FileOperationType(json: json), let fileProvider = fileProvider else {
            return
@@ -11,11 +11,11 @@ import Foundation
 // This client implementation is for little-endian platform, namely x86, x64 & arm
 // For big-endian platforms like PowerPC, there must be a huge overhaul

-protocol SMBProtocolClientDelegate: class {
-    func receivedResponse(client: SMB2ProtocolClient, response: SMBResponse, for: SMBRequest)
+protocol FileProviderSMBTaskDelegate: class {
+    func receivedResponse(client: FileProviderSMBTask, response: SMBResponse, for: SMBRequest)
 }

-class SMB2ProtocolClient: FileProviderStreamTask {
+class FileProviderSMBTask: FileProviderStreamTask {
    var timeout: TimeInterval = 30
    
    private(set) var lastMessageID: UInt64 = 0
@@ -31,14 +31,14 @@ class SMB2ProtocolClient: FileProviderStreamTask {
    private(set) var requestStack = [Int: SMBRequest]()
    private(set) var responseStack = [Int: SMBResponse]()
    
-    weak var delegate: SMBProtocolClientDelegate?
+    weak var delegate: FileProviderSMBTaskDelegate?
    
    func sendNegotiate(completionHandler: SimpleCompletionHandler) -> UInt64 {
        let mId = messageId()
        let smbHeader = SMB2.Header(command: .NEGOTIATE, creditRequestResponse: UInt16(126), messageId: mId, treeId: UInt32(0), sessionId: UInt64(0))
        let msg = SMB2.NegotiateRequest()
        let data = createSMB2Message(header: smbHeader, message: msg)
-        self.write(data, timeout: 0, completionHandler: { (e) in
+        self.write(data, timeout: timeout, completionHandler: { (e) in
            completionHandler?(e)
        })
        return mId
@@ -50,7 +50,7 @@ class SMB2ProtocolClient: FileProviderStreamTask {
        let smbHeader = SMB2.Header(command: SMB2.Command.SESSION_SETUP, creditRequestResponse: credit, messageId: mId, treeId: UInt32(0), sessionId: sessionId)
        let msg = SMB2.SessionSetupRequest(singing: [])
        let data = createSMB2Message(header: smbHeader, message: msg)
-        self.write(data, timeout: 0, completionHandler: { (e) in
+        self.write(data, timeout: timeout, completionHandler: { (e) in
            if self.sessionId == 0 {
                self.readData(ofMinLength: 64, maxLength: 65536, timeout: self.timeout, completionHandler: { (data, eof, e2) in
                    // TODO: set session id
@@ -73,7 +73,7 @@ class SMB2ProtocolClient: FileProviderStreamTask {
        let tcHeader = SMB2.TreeConnectRequest.Header(flags: [])
        let msg = SMB2.TreeConnectRequest(header: tcHeader, host: host, share: share)
        let data = createSMB2Message(header: smbHeader, message: msg!)
-        self.write(data, timeout: 0, completionHandler: { (e) in
+        self.write(data, timeout: timeout, completionHandler: { (e) in
            completionHandler?(e)
            
        })
@@ -85,7 +85,7 @@ class SMB2ProtocolClient: FileProviderStreamTask {
        let smbHeader = SMB2.Header(command: .TREE_DISCONNECT, creditRequestResponse: 111, messageId: mId, treeId: treeId, sessionId: sessionId)
        let msg = SMB2.TreeDisconnect()
        let data = createSMB2Message(header: smbHeader, message: msg)
-        self.write(data, timeout: 0, completionHandler: { (e) in
+        self.write(data, timeout: timeout, completionHandler: { (e) in
            completionHandler?(e)
        })
        return mId
@@ -96,7 +96,7 @@ class SMB2ProtocolClient: FileProviderStreamTask {
        let smbHeader = SMB2.Header(command: .LOGOFF, creditRequestResponse: 0, messageId: mId, treeId: 0, sessionId: sessionId)
        let msg = SMB2.LogOff()
        let data = createSMB2Message(header: smbHeader, message: msg)
-        self.write(data, timeout: 0, completionHandler: { (e) in
+        self.write(data, timeout: timeout, completionHandler: { (e) in
            completionHandler?(e)
        })
        return mId
@@ -108,7 +108,7 @@ class SMB2ProtocolClient: FileProviderStreamTask {
 }

 // MARK: create and analyse messages
-extension SMB2ProtocolClient {
+extension FileProviderSMBTask {
    func determineSMBVersion(_ data: Data) -> Float {
        let smbverChar: Int8 = Int8(bitPattern: data.first ?? 0)
        let version = 0 - smbverChar
@@ -24,9 +24,15 @@ class SMBFileProvider: FileProvider, FileProviderMonitor {
            return nil
        }
        self.baseURL = baseURL.appendingPathComponent("")
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: .concurrent)
+        
+        #if swift(>=3.1)
+        let queueLabel = "FileProvider.\(Swift.type(of: self).type)"
+        #else
+        let queueLabel = "FileProvider.\(type(of: self).type)"
+        #endif
+        dispatch_queue = DispatchQueue(label: queueLabel, attributes: .concurrent)
        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
+        operation_queue.name = "\(queueLabel).Operation"
        
        self.credential = credential
    }
@@ -68,53 +74,54 @@ class SMBFileProvider: FileProvider, FileProviderMonitor {
    
    open weak var fileOperationDelegate: FileOperationDelegate?
    
-    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func copyItem(path: String, toLocalURL: URL, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
+    open func contents(path: String, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
+    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> Progress? {
        NotImplemented()
        return nil
    }
    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler:((FileObjectClass) -> Void)?, completionHandler: @escaping ((_ files: [FileObjectClass], _ error: Error?) -> Void)) {
+    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler:((FileObjectClass) -> Void)?, completionHandler: @escaping ((_ files: [FileObjectClass], _ error: Error?) -> Void)) -> Progress? {
        NotImplemented()
+        return nil
    }
    
    open func registerNotifcation(path: String, eventHandler: @escaping (() -> Void)) {
@@ -7,67 +7,22 @@
 //

 import Foundation
+import CoreGraphics

 /**
 Allows accessing to WebDAV server files. This provider doesn't cache or save files internally, however you can
 set `useCache` and `cache` properties to use Foundation `NSURLCache` system.
 
- WebDAV system supported by many cloud services including [Box.net](https://www.box.com/home) 
+ WebDAV system supported by many cloud services including [Box.com](https://www.box.com/home) 
 and [Yandex disk](https://disk.yandex.com) and [ownCloud](https://owncloud.org).
 
 - Important: Because this class uses `URLSession`, it's necessary to disable App Transport Security
     in case of using this class with unencrypted HTTP connection.
     [Read this to know how](http://iosdevtips.co/post/121756573323/ios-9-xcode-7-http-connect-server-error).
 */
-open class WebDAVFileProvider: FileProviderBasicRemote {
-    open class var type: String { return "WebDAV" }
-    open let baseURL: URL?
-    open var currentPath: String
-    
-    open var dispatch_queue: DispatchQueue
-    open var operation_queue: OperationQueue {
-        willSet {
-            assert(_session == nil, "It's not effective to change dispatch_queue property after session is initialized.")
-        }
-    }
-    
-    public weak var delegate: FileProviderDelegate?
-    open var credential: URLCredential? {
-        didSet {
-            sessionDelegate?.credential = credential
-        }
-    }
-    open private(set) var cache: URLCache?
-    public var useCache: Bool
-    public var validatingCache: Bool
-    
-    fileprivate var _session: URLSession?
-    fileprivate var sessionDelegate: SessionDelegate?
-    public var session: URLSession {
-        get {
-            if _session == nil {
-                self.sessionDelegate = SessionDelegate(fileProvider: self, credential: credential)
-                let queue = OperationQueue()
-                //queue.underlyingQueue = dispatch_queue
-                let config = URLSessionConfiguration.default
-                config.urlCache = cache
-                config.requestCachePolicy = .returnCacheDataElseLoad
-                _session = URLSession(configuration: config, delegate: sessionDelegate as URLSessionDownloadDelegate?, delegateQueue: queue)
-                _session?.sessionDescription = UUID().uuidString
-                initEmptySessionHandler(_session!.sessionDescription!)
-            }
-            return _session!
-        }
-        
-        set {
-            assert(newValue.delegate is SessionDelegate, "session instances should have a SessionDelegate instance as delegate.")
-            _session = newValue
-            if session.sessionDescription?.isEmpty ?? true {
-                _session?.sessionDescription = UUID().uuidString
-            }
-            initEmptySessionHandler(_session!.sessionDescription!)
-        }
-    }
+open class WebDAVFileProvider: HTTPFileProvider {
+    override open class var type: String { return "WebDAV" }
+    public var credentialType: HTTPAuthenticationType = .digest
    
    /**
     Initializes WebDAV provider.
@@ -81,15 +36,8 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        if  !["http", "https"].contains(baseURL.uw_scheme.lowercased()) {
            return nil
        }
-        self.baseURL = (baseURL.path.hasSuffix("/") ? baseURL : baseURL.appendingPathComponent("")).absoluteURL
-        self.currentPath = ""
-        self.useCache = false
-        self.validatingCache = true
-        self.cache = cache
-        self.credential = credential
-        dispatch_queue = DispatchQueue(label: "FileProvider.\(type(of: self).type)", attributes: .concurrent)
-        operation_queue = OperationQueue()
-        operation_queue.name = "FileProvider.\(type(of: self).type).Operation"
+        let refinedBaseURL = (baseURL.absoluteString.hasSuffix("/") ? baseURL : baseURL.appendingPathComponent("")).absoluteURL
+        super.init(baseURL: refinedBaseURL, credential: credential, cache: cache)
    }
    
    public required convenience init?(coder aDecoder: NSCoder) {
@@ -103,19 +51,7 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        self.validatingCache = aDecoder.decodeBool(forKey: "validatingCache")
    }
    
-    open func encode(with aCoder: NSCoder) {
-        aCoder.encode(self.baseURL, forKey: "baseURL")
-        aCoder.encode(self.credential, forKey: "credential")
-        aCoder.encode(self.currentPath, forKey: "currentPath")
-        aCoder.encode(self.useCache, forKey: "useCache")
-        aCoder.encode(self.validatingCache, forKey: "validatingCache")
-    }
-    
-    public static var supportsSecureCoding: Bool {
-        return true
-    }
-    
-    open func copy(with zone: NSZone? = nil) -> Any {
+    override open func copy(with zone: NSZone? = nil) -> Any {
        let copy = WebDAVFileProvider(baseURL: self.baseURL!, credential: self.credential, cache: self.cache)!
        copy.currentPath = self.currentPath
        copy.delegate = self.delegate
@@ -125,19 +61,7 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        return copy
    }
    
-    deinit {
-        if let sessionuuid = _session?.sessionDescription {
-            removeSessionHandler(for: sessionuuid)
-        }
-        
-        if fileProviderCancelTasksOnInvalidating {
-            _session?.invalidateAndCancel()
-        } else {
-            _session?.finishTasksAndInvalidate()
-        }
-    }
-    
-    public func contentsOfDirectory(path: String, completionHandler: @escaping (([FileObject], Error?) -> Void)) {
+    override open func contentsOfDirectory(path: String, completionHandler: @escaping (([FileObject], Error?) -> Void)) {
        self.contentsOfDirectory(path: path, including: [], completionHandler: completionHandler)
    }
    
@@ -158,10 +82,11 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        var request = URLRequest(url: url)
        request.httpMethod = "PROPFIND"
        request.setValue("1", forHTTPHeaderField: "Depth")
-        request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.set(contentType: .xml)
        request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n\(WebDavFileObject.propString(including))\n</D:propfind>".data(using: .utf8)
        request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
-        runDataTask(with: request, operationHandle: RemoteOperationHandle(operationType: opType, tasks: []), completionHandler: { (data, response, error) in
+        runDataTask(with: request, operation: opType, completionHandler: { (data, response, error) in
            var responseError: FileProviderWebDavError?
            if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
                responseError = FileProviderWebDavError(code: rCode, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8), url: url)
@@ -180,7 +105,7 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        })
    }
    
-    open func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
+    override open func attributesOfItem(path: String, completionHandler: @escaping ((_ attributes: FileObject?, _ error: Error?) -> Void)) {
        self.attributesOfItem(path: path, including: [], completionHandler: completionHandler)
    }
    
@@ -200,7 +125,8 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        var request = URLRequest(url: url)
        request.httpMethod = "PROPFIND"
        request.setValue("1", forHTTPHeaderField: "Depth")
-        request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.set(contentType: .xml)
        request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n\(WebDavFileObject.propString(including))\n</D:propfind>".data(using: .utf8)
        request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
        runDataTask(with: request, completionHandler: { (data, response, error) in
@@ -219,7 +145,7 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        })
    }
    
-    open func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
+    override open func storageProperties(completionHandler: @escaping ((_ total: Int64, _ used: Int64) -> Void)) {
        // Not all WebDAV clients implements RFC2518 which allows geting storage quota.
        // In this case you won't get error. totalSize is NSURLSessionTransferSizeUnknown
        // and used space is zero.
@@ -229,7 +155,8 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        var request = URLRequest(url: baseURL)
        request.httpMethod = "PROPFIND"
        request.setValue("0", forHTTPHeaderField: "Depth")
-        request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.set(contentType: .xml)
        request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop><D:quota-available-bytes/><D:quota-used-bytes/></D:prop>\n</D:propfind>".data(using: .utf8)
        request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
        runDataTask(with: request, completionHandler: { (data, response, error) in
@@ -246,14 +173,17 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        })
    }
    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
+    override open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) -> Progress? {
        let url = self.url(of: path)
        var request = URLRequest(url: url)
        request.httpMethod = "PROPFIND"
        //request.setValue("1", forHTTPHeaderField: "Depth")
-        request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.set(contentType: .xml)
        request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:allprop/></D:propfind>".data(using: .utf8)
-        runDataTask(with: request, completionHandler: { (data, response, error) in
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(url, forKey: .fileURLKey)
+        let task = session.dataTask(with: request) { (data, response, error) in
            // FIXME: paginating results
            var responseError: FileProviderWebDavError?
            if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
@@ -269,20 +199,28 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
                    }
                    
                    fileObjects.append(fileObject)
+                    progress.completedUnitCount = Int64(fileObjects.count)
                    foundItemHandler?(fileObject)
                }
                completionHandler(fileObjects, responseError ?? error)
                return
            }
            completionHandler([], responseError ?? error)
-        })
+        }
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
+        task.resume()
+        return progress
    }
    
-    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
+    override open func isReachable(completionHandler: @escaping (Bool) -> Void) {
        var request = URLRequest(url: baseURL!)
        request.httpMethod = "PROPFIND"
        request.setValue("0", forHTTPHeaderField: "Depth")
-        request.setValue("text/xml; charset=\"utf-8\"", forHTTPHeaderField: "Content-Type")
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.set(contentType: .xml)
        request.httpBody = "<?xml version=\"1.0\" encoding=\"utf-8\" ?>\n<D:propfind xmlns:D=\"DAV:\">\n<D:prop><D:quota-available-bytes/><D:quota-used-bytes/></D:prop>\n</D:propfind>".data(using: .utf8)
        request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
        runDataTask(with: request, completionHandler: { (data, response, error) in
@@ -291,232 +229,72 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        })
    }
    
-    open weak var fileOperationDelegate: FileOperationDelegate?
-}
-
-extension WebDAVFileProvider: FileProviderOperations {
-    @discardableResult
-    open func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.create(path: (atPath as NSString).appendingPathComponent(folderName) + "/")
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        let url = self.url(of: atPath).appendingPathComponent(folderName.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? folderName, isDirectory: true)
-        var request = URLRequest(url: url)
-        request.httpMethod = "MKCOL"
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var responseError: FileProviderWebDavError?
-            if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
-                responseError = FileProviderWebDavError(code: rCode, path: url.relativePath, errorDescription: String(data: data ?? Data(), encoding: .utf8), url: url)
+    override func request(for operation: FileOperationType, overwrite: Bool = true, attributes: [URLResourceKey: Any] = [:]) -> URLRequest {
+        let method: String
+        let url: URL
+        let sourceURL = self.url(of: operation.source)
+        
+        switch operation {
+        case .fetch:
+            method = "GET"
+            url = sourceURL
+        case .create:
+            if sourceURL.absoluteString.hasSuffix("/") {
+                method = "MKCOL"
+                url = sourceURL
+            } else {
+                fallthrough
+            }
+        case .modify:
+            method = "PUT"
+            url = sourceURL
+            break
+        case .copy(let source, let dest):
+            if source.hasPrefix("file://") {
+                method = "PUT"
+                url = self.url(of: dest)
+            } else if dest.hasPrefix("file://") {
+                method = "GET"
+                url = sourceURL
+            } else {
+                method = "COPY"
+                url = sourceURL
            }
-            completionHandler?(responseError ?? error)
-            self.delegateNotify(opType, error: responseError ?? error)
-        })
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
-    }
-    
-    @discardableResult
-    open func moveItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.move(source: path, destination: toPath)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        return self.doOperation(operation: opType, overwrite: overwrite, completionHandler: completionHandler)
-    }
-    
-    @discardableResult
-    open func copyItem(path: String, to toPath: String, overwrite: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: path, destination: toPath)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        return self.doOperation(operation: opType, overwrite: overwrite, completionHandler: completionHandler)
-    }
-    
-    @discardableResult
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.remove(path: path)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        return self.doOperation(operation: opType, completionHandler: completionHandler)
-    }
-    
-    func doOperation(operation opType: FileOperationType, overwrite: Bool? = nil, completionHandler: SimpleCompletionHandler) -> OperationHandle?  {
-        let source = opType.source!
-        let sourceURL = self.url(of: source)
-        var request = URLRequest(url: sourceURL)
-        if let dest = opType.destination {
-            request.setValue(url(of:dest).absoluteString, forHTTPHeaderField: "Destination")
-        }
-        switch opType {
-        case .copy:
-            request.httpMethod = "COPY"
        case .move:
-            request.httpMethod = "MOVE"
+            method = "MOVE"
+            url = sourceURL
        case .remove:
-            request.httpMethod = "DELETE"
+            method = "DELETE"
+            url = sourceURL
        default:
-            return nil
+            fatalError("Unimplemented operation \(operation.description) in \(#file)")
        }
        
-        if let overwrite = overwrite, !overwrite {
-            request.setValue("F", forHTTPHeaderField: "Overwrite")
-        }
-        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
-            var responseError: FileProviderWebDavError?
-            if let response = response as? HTTPURLResponse, let code = FileProviderHTTPErrorCode(rawValue: response.statusCode) {
-                if response.statusCode >= 300  {
-                    responseError = FileProviderWebDavError(code: code, path: source, errorDescription: String(data: data ?? Data(), encoding: .utf8), url: sourceURL)
-                }
-                if code == .multiStatus, let data = data {
-                    let xresponses = DavResponse.parse(xmlResponse: data, baseURL: self.baseURL)
-                    for xresponse in xresponses where (xresponse.status ?? 0) >= 300 {
-                        let error = FileProviderWebDavError(code: code, path: source, errorDescription: String(data: data, encoding: .utf8), url: sourceURL)
-                        completionHandler?(error)
-                    }
-                }
-            }
-            if (response as? HTTPURLResponse)?.statusCode ?? 0 != FileProviderHTTPErrorCode.multiStatus.rawValue {
-                completionHandler?(responseError ?? error)
-            }
-            
-            self.delegateNotify(opType, error: responseError ?? error)
-        })
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
-    }
-    
-    @discardableResult
-    open func copyItem(localFile: URL, to toPath: String, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: localFile.absoluteString, destination: toPath)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        let url = self.url(of:toPath)
        var request = URLRequest(url: url)
-        if !overwrite {
-            request.setValue("F", forHTTPHeaderField: "Overwrite")
+        request.httpMethod = method
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.setValue(overwrite ? "T" : "F", forHTTPHeaderField: "Overwrite")
+        if let dest = operation.destination, !dest.hasPrefix("file://") {
+            request.setValue(self.url(of:dest).absoluteString, forHTTPHeaderField: "Destination")
        }
-        request.httpMethod = "PUT"
-        let task = session.uploadTask(with: request, fromFile: localFile)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { [weak self] error in
-            var responseError: FileProviderWebDavError?
-            if let code = (task.response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
-                // We can't fetch server result from delegate!
-                responseError = FileProviderWebDavError(code: rCode, path: toPath, errorDescription: nil, url: url)
-            }
-            completionHandler?(responseError ?? error)
-            self?.delegateNotify(.create(path: toPath), error: responseError ?? error)
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
+        
+        return request
    }
    
-    @discardableResult
-    open func copyItem(path: String, toLocalURL destURL: URL, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.copy(source: path, destination: destURL.absoluteString)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
+    override func serverError(with code: FileProviderHTTPErrorCode, path: String?, data: Data?) -> FileProviderHTTPError {
+        return FileProviderWebDavError(code: code, path: path ?? "", errorDescription:  data.flatMap({ String(data: $0, encoding: .utf8) }), url: self.url(of: path))
+    }
+    
+    override func multiStatusHandler(source: String, data: Data, completionHandler: SimpleCompletionHandler) {
+        let xresponses = DavResponse.parse(xmlResponse: data, baseURL: self.baseURL)
+        for xresponse in xresponses where (xresponse.status ?? 0) >= 300 {
+            let code = xresponse.status.flatMap { FileProviderHTTPErrorCode(rawValue: $0) } ?? .internalServerError
+            let error = FileProviderWebDavError(code: code, path: source, errorDescription: String(data: data, encoding: .utf8), url: self.url(of: source))
+            completionHandler?(error)
        }
-        let url = self.url(of:path)
-        let request = URLRequest(url: url)
-        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = completionHandler
-        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
-            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
-                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
-                let serverError : FileProviderWebDavError? = code != nil ? FileProviderWebDavError(code: code!, path: path, errorDescription: code?.description, url: url) : nil
-                completionHandler?(serverError)
-                return
-            }
-            do {
-                try FileManager.default.moveItem(at: tempURL, to: destURL)
-                completionHandler?(nil)
-            } catch let e {
-                completionHandler?(e)
-            }
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
    }
 }
-
-extension WebDAVFileProvider: FileProviderReadWrite {
-    @discardableResult
-    open func contents(path: String, offset: Int64, length: Int, completionHandler: @escaping ((_ contents: Data?, _ error: Error?) -> Void)) -> OperationHandle? {
-        if length == 0 || offset < 0 {
-            dispatch_queue.async {
-                completionHandler(Data(), nil)
-            }
-            return nil
-        }
-        
-        let opType = FileOperationType.fetch(path: path)
-        let url = self.url(of: path)
-        var request = URLRequest(url: url)
-        if length > 0 {
-            request.setValue("bytes=\(offset)-\(offset + Int64(length) - 1)", forHTTPHeaderField: "Range")
-        } else if offset > 0 && length < 0 {
-            request.setValue("bytes=\(offset)-", forHTTPHeaderField: "Range")
-        }
-        
-        let task = session.downloadTask(with: request)
-        let handle = RemoteOperationHandle(operationType: opType, tasks: [task])
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
-            completionHandler(nil, error)
-        }
-        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
-            guard let httpResponse = task.response as? HTTPURLResponse , httpResponse.statusCode < 300 else {
-                let code = FileProviderHTTPErrorCode(rawValue: (task.response as? HTTPURLResponse)?.statusCode ?? -1)
-                let serverError : FileProviderWebDavError? = code != nil ? FileProviderWebDavError(code: code!, path: path, errorDescription: code?.description, url: url) : nil
-                completionHandler(nil, serverError)
-                return
-            }
-            do {
-                let data = try Data(contentsOf: tempURL)
-                self.dispatch_queue.async {
-                    completionHandler(data, nil)
-                }
-            } catch let e {
-                completionHandler(nil, e)
-            }
-        }
-        return handle
-    }
-    
-    @discardableResult
-    open func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let opType = FileOperationType.modify(path: path)
-        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
-            return nil
-        }
-        // FIXME: lock destination before writing process
-        let url = atomically ? self.url(of: path).appendingPathExtension("tmp") : self.url(of: path)
-        var request = URLRequest(url: url)
-        request.httpMethod = "PUT"
-        if !overwrite {
-            request.setValue("F", forHTTPHeaderField: "Overwrite")
-        }
-        let task = session.uploadTask(with: request, from: data ?? Data())
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { [weak self] error in
-            var responseError: FileProviderWebDavError?
-            if let code = (task.response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
-                // We can't fetch server result from delegate!
-                responseError = FileProviderWebDavError(code: rCode, path: path, errorDescription: nil, url: url)
-            }
-            completionHandler?(responseError ?? error)
-            self?.delegateNotify(opType, error: responseError ?? error)
-        }
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
-    }
+extension WebDAVFileProvider {
    
    /*
    fileprivate func registerNotifcation(path: String, eventHandler: (() -> Void)) {
@@ -534,22 +312,88 @@ extension WebDAVFileProvider: FileProviderReadWrite {
    // TODO: implements methods for lock mechanism
 }

-extension WebDAVFileProvider: FileProvider { }
-
-// MARK: WEBDAV XML response implementation
-
-internal extension WebDAVFileProvider {
-    fileprivate func delegateNotify(_ operation: FileOperationType, error: Error?) {
-        DispatchQueue.main.async(execute: {
-            if error == nil {
-                self.delegate?.fileproviderSucceed(self, operation: operation)
-            } else {
-                self.delegate?.fileproviderFailed(self, operation: operation)
+extension WebDAVFileProvider: ExtendedFileProvider {
+    open func thumbnailOfFileSupported(path: String) -> Bool {
+        guard self.baseURL?.host?.contains("dav.yandex.") ?? false else {
+            return false
+        }
+        let supportedExt: [String] = ["jpg", "jpeg", "png", "gif"]
+        return supportedExt.contains((path as NSString).pathExtension)
+    }
+    
+    open func thumbnailOfFile(path: String, dimension: CGSize?, completionHandler: @escaping ((ImageClass?, Error?) -> Void)) {
+        guard self.baseURL?.host?.contains("dav.yandex.") ?? false else {
+            dispatch_queue.async {
+                completionHandler(nil, self.throwError(path, code: URLError.resourceUnavailable))
            }
+            return
+        }
+        
+        let dimension = dimension ?? CGSize(width: 64, height: 64)
+        let url = URL(string: self.url(of: path).absoluteString + "?preview&size=\(dimension.width)x\(dimension.height)")!
+        var request = URLRequest(url: url)
+        request.httpMethod = "GET"
+        request.set(httpAuthentication: credential, with: credentialType)
+        let task = session.dataTask(with: request, completionHandler: { (data, response, error) in
+            var responseError: FileProviderWebDavError?
+            if let code = (response as? HTTPURLResponse)?.statusCode , code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
+                responseError = FileProviderWebDavError(code: rCode, path: url.relativePath, errorDescription: String(data: data ?? Data(), encoding: .utf8), url: url)
+                completionHandler(nil, responseError ?? error)
+                return
+            }
+            
+            completionHandler(data.flatMap({ ImageClass(data: $0) }), nil)
+        })
+        task.resume()
+    }
+    
+    open func propertiesOfFileSupported(path: String) -> Bool {
+        return false
+    }
+    
+    open func propertiesOfFile(path: String, completionHandler: @escaping (([String : Any], [String], Error?) -> Void)) {
+        dispatch_queue.async {
+            completionHandler([:], [], self.throwError(path, code: URLError.resourceUnavailable))
+        }
+    }
+}
+
+extension WebDAVFileProvider: FileProviderSharing {
+    open func publicLink(to path: String, completionHandler: @escaping ((URL?, FileObject?, Date?, Error?) -> Void)) {
+        guard self.baseURL?.host?.contains("dav.yandex.") ?? false else {
+            dispatch_queue.async {
+                completionHandler(nil, nil, nil, self.throwError(path, code: URLError.resourceUnavailable))
+            }
+            return
+        }
+        
+        let url = self.url(of: path)
+        var request = URLRequest(url: url)
+        request.httpMethod = "PROPPATCH"
+        request.set(httpAuthentication: credential, with: credentialType)
+        request.set(contentType: .xml)
+        let body = "<propertyupdate xmlns=\"DAV:\">\n<set><prop>\n<public_url xmlns=\"urn:yandex:disk:meta\">true</public_url>\n</prop></set>\n</propertyupdate>"
+        request.httpBody = body.data(using: .utf8)
+        request.setValue(String(request.httpBody!.count), forHTTPHeaderField: "Content-Length")
+        runDataTask(with: request, completionHandler: { (data, response, error) in
+            var responseError: FileProviderWebDavError?
+            if let code = (response as? HTTPURLResponse)?.statusCode, code >= 300, let rCode = FileProviderHTTPErrorCode(rawValue: code) {
+                responseError = FileProviderWebDavError(code: rCode, path: path, errorDescription: String(data: data ?? Data(), encoding: .utf8), url: url)
+            }
+            if let data = data {
+                let xresponse = DavResponse.parse(xmlResponse: data, baseURL: self.baseURL)
+                if let urlStr = xresponse.first?.prop["public_url"], let url = URL(string: urlStr) {
+                    completionHandler(url, nil, nil, nil)
+                    return
+                }
+            }
+            completionHandler(nil, nil, nil, responseError ?? error)
        })
    }
 }

+// MARK: WEBDAV XML response implementation
+
 struct DavResponse {
    let href: URL
    let hrefString: String
@@ -560,7 +404,7 @@ struct DavResponse {
        
        func standardizePath(_ str: String) -> String {
            let trimmedStr = str.hasPrefix("/") ? str.substring(from: str.index(after: str.startIndex)) : str
-            return trimmedStr.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? str
+            return trimmedStr.addingPercentEncoding(withAllowedCharacters: CharacterSet.urlPathAllowed.subtracting(CharacterSet(charactersIn: ":"))) ?? str
        }
        
        // find node names with namespace
Author	SHA1	Message	Date
Amir Abbas	cad68da076	Refactored Dropbox, WebDAV & OneDrive to HTTPFileProvider - FileOperationType.source is not optional anymore - critical bugfix: KVO exception crash on task completion	2017-08-19 05:51:25 +04:30
Amir Abbas Mousavian	39da09edd4	Merge pull request #60 from evilutioner/master Fixed file downloading progress	2017-08-15 18:53:21 +04:30
Amir Abbas	5129aee1b5	Added fileURL to Progress	2017-08-15 18:41:48 +04:30
Oleg Marchik	478f0819b5	Fixed file downloading progress	2017-08-15 16:57:50 +03:00
Amir Abbas	b2a7800f7c	Fixed typo	2017-08-15 15:08:06 +04:30
Amir Abbas	96c102d156	Updated readme and podspec to ver 0.19.0	2017-08-15 14:57:36 +04:30
Amir Abbas	8aedd8e72a	Replaced OperationHandle with (NS)Progress	2017-08-15 13:42:41 +04:30
Amir Abbas	5b55debe8a	Fix warning in OneDrive provider	2017-08-12 17:50:00 +04:30
Amir Abbas Mousavian	0fa062a946	Merge pull request #59 from evilutioner/master OneDrive: list folder issue fixed, removed escape symbols in path	2017-08-11 20:43:28 +04:30
Oleg Marchik	879f86c1f9	Merge branch 'master' into master	2017-08-11 18:07:25 +03:00
Oleg Marchik	80d5f02bbd	OneDrive: list folder issue fixed, removed escape symbols in path	2017-08-11 18:04:18 +03:00
Amir Abbas Mousavian	b8a7721b2f	Merge pull request #58 from evilutioner/master Dropbox bug fixing: added unicode symbols support in http header path	2017-08-10 22:29:08 +04:30
Oleg Marchik	44b4784cd3	Important dropbox bug fixing: added unicode symbols support in path	2017-08-10 11:36:15 +03:00
Amir Abbas	7d9e2247f2	Fixed Compile error, removed redundant comments	2017-08-04 00:30:46 +04:30
Amir Abbas Mousavian	0ace562442	Merge pull request #57 from evilutioner/master Fixed outdated OneDrive API	2017-08-04 00:27:36 +04:30
evilutioner	63d831ef90	Merge branch 'master' into master	2017-08-01 16:08:51 +03:00
Oleg Marchik	d6b91348a3	Fixed outdated OneDrive API	2017-08-01 12:55:39 +03:00
Amir Abbas	fd9d4c1ab4	Probable fix for # 55 (OneDrive url issue)	2017-07-31 20:10:40 +04:30
Amir Abbas	41e266c2a9	Fix #54(FTP login), Refactored ExtendedLocalFileProvider	2017-07-17 05:36:30 +04:30
Amir Abbas	6127f4a7d9	Fixed Readme errors	2017-07-14 19:28:41 +04:30
Amir Abbas	faca943beb	Updated Readme fot FTP and SMB description	2017-07-14 16:49:55 +04:30
Amir Abbas	9345436fa2	Enhanced PDF Meta-info, Better FTPS handling	2017-07-14 16:49:24 +04:30
Amir Abbas	6228d88d41	Adjusting readme badges	2017-07-05 21:35:15 +04:30
Amir Abbas	5b395915a9	Updated Readme for Pods and SPM file	2017-07-02 18:26:34 +04:30
Amir Abbas	e4f12a502b	Fixed repo name and Readme	2017-07-01 16:57:23 +04:30
Amir Abbas	8faad0ec65	Fixed project name in schemes	2017-07-01 14:14:45 +04:30
Amir Abbas	bd5569d213	Updated scheme names	2017-07-01 14:09:39 +04:30
Amir Abbas	14ed279879	Renamed framework for compatibility with iOS 11	2017-07-01 13:50:22 +04:30
Amir Abbas	fd293f7bdb	[Amend] Fixed swift 3.0 compile error for type(of:)	2017-07-01 11:08:49 +04:30
Amir Abbas	3d9625e243	Fixed swift 3.0 compile error for type(of:)	2017-07-01 11:03:22 +04:30
Amir Abbas	0d017ebfc4	Fix #52 (Swift 4.0 source compatibility)	2017-07-01 10:47:48 +04:30
Amir Abbas	fd36df67f3	FTP passive property encoding - removed redundant protocol conforming	2017-07-01 09:43:45 +04:30
Amir Abbas	5be8c4ef5e	podspec and version update	2017-06-27 14:02:00 +04:30
Amir Abbas	0374fd7688	Making ftp active data task creation async	2017-06-24 12:09:16 +04:30
Amir Abbas	5ddfa43555	Fix #49 (Workaround colon in url path bug in NSURL relative url)	2017-06-24 12:04:50 +04:30
Amir Abbas	21850bb548	Probable fix for #51	2017-06-24 11:44:12 +04:30
Amir Abbas	b166e111e0	FTP Active mode, FTPS bugfix, possible fix for #47	2017-05-25 17:33:56 +04:30
Amir Abbas	1dd7561215	Caching ftp server support for RFC3659, Possible fix for #47	2017-05-23 19:10:04 +04:30
Amir Abbas	f94719deb0	Fixes #39 (FTP listing), Error domain determination	2017-05-05 13:02:07 +04:30
Amir Abbas	b13df0a977	Fixes #38 (Creating folder on WebDAV)	2017-05-05 10:06:17 +04:30
Amir Abbas	24af7aa4c2	Fixed LocalFileProvider init baseURL issue	2017-04-20 01:27:59 +04:30
Amir Abbas	06039ad993	CloudFileProvider operation handle improvements	2017-04-20 01:06:36 +04:30
Amir Abbas Mousavian	d8fec3e346	Merge pull request #37 from hansvdam/master Making `inProgress` of LocalFileProvider working	2017-04-18 14:22:08 +04:30
Hans van Dam	5c93bc8731	making 'inProgress' of LocalFileProvider work more consistently	2017-04-18 11:03:35 +02:00
Hans van Dam	61ba245189	making 'inProgress' of LocalFileProvider work	2017-04-17 18:16:04 +02:00
Amir Abbas	02e6cd37dd	WebDAV OAuth 1,2 support	2017-04-16 19:19:17 +04:30
Amir Abbas	55608fb8d0	New FileProviderSharing protocol for publicLinks - fixed DropboxFileProvider.propertiesOfFile() bug - minor URLRequest refactors - Added documentation and scope declaration	2017-04-16 19:07:45 +04:30
Amir Abbas	3e3582f6fa	Changed DropboxFileProvider.type constant to “Dropbox”	2017-04-15 21:31:47 +04:30
Amir Abbas	dd7a9d20b6	Fixed macOS build error	2017-04-14 23:26:40 +04:30
Amir Abbas	d4a9b4a34f	Fixed Dropbox thumbnail issue	2017-04-14 22:07:35 +04:30
Amir Abbas	34c663e62c	FileObject.url is unwraped. fixed url initializing from path	2017-04-14 18:57:50 +04:30
Amir Abbas	1415dda987	Fixed #36 (FTP Uploading bug)	2017-04-14 18:55:07 +04:30
Amir Abbas	cd465c1288	Fixes #35 (Dropbox handlers), Fixed FTP response reading length	2017-04-14 11:15:09 +04:30
Amir Abbas	a605b0cd85	Added FTP Recursive listing, Implemented ftp search - Implemented FTP full directory remove - Fixed FTP STOR bug - Implemented relativePath(of:) for FTP - Initial implementation of FTP active mode	2017-04-11 22:21:13 +04:30
Amir Abbas	bf7043de29	Fixed `relativePath(of:)` bug, made it overridable - Fixed StreamTask.taskDescription bug	2017-04-11 19:43:34 +04:30
Amir Abbas	ff5e13931f	Fixed WebDAVProvider.contents bug, refactored FTP Error	2017-04-09 14:09:03 +04:30
Amir Abbas	75af738d2e	Made SessionDelegate init public, fixed pod issue	2017-04-05 02:05:28 +04:30
Amir Abbas	f54a1253e4	Throwing error when trying to upload a directory	2017-04-05 00:24:24 +04:30
Amir Abbas	1394a92662	Add Documentation	2017-04-03 21:03:48 +04:30