Fixed typo

Updated readme and podspec to ver 0.19.0
Replaced OperationHandle with (NS)Progress
2017-08-15 15:08:06 +04:30 · 2017-08-15 14:57:36 +04:30 · 2017-08-15 13:42:41 +04:30 · 2017-08-12 17:50:00 +04:30 · 2017-08-11 20:43:28 +04:30 · 2017-08-11 18:07:25 +03:00
21 changed files with 1014 additions and 642 deletions
@@ -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"
@@ -16,7 +16,7 @@ Pod::Spec.new do |s|
  #

  s.name         = "FilesProvider"
-  s.version      = "0.18.0"
+  s.version      = "0.19.0"
  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.
@@ -621,7 +621,7 @@
 		799396601D48B7BF00086753 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				BUNDLE_VERSION_STRING = 0.18.0;
+				BUNDLE_VERSION_STRING = 0.19.0;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -653,7 +653,7 @@
 		799396611D48B7BF00086753 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				BUNDLE_VERSION_STRING = 0.18.0;
+				BUNDLE_VERSION_STRING = 0.19.0;
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
 				CLANG_WARN_EMPTY_BODY = YES;
@@ -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) 
 ---> 

@@ -30,7 +37,6 @@ All functions do async calls and it wont block your main thread.
 - [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 `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.
-    * Active mode is not implemented yet.
 - [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.
@@ -39,7 +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

@@ -51,7 +57,7 @@ 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.
+### 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
@@ -240,10 +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)")
 	}
 })
 ```
@@ -260,15 +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:
@@ -307,8 +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.
@@ -340,7 +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.

@@ -361,6 +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:
@@ -404,12 +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.
@@ -441,9 +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
        }
@@ -495,10 +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
@@ -508,7 +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/
@@ -243,13 +243,13 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
     - 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]
        
@@ -282,6 +282,8 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
            }
        }
        
+        let progress = Progress(parent: nil, userInfo: nil)
+        
        dispatch_queue.async {
            let pathURL = self.url(of: path)
            let mdquery = NSMetadataQuery()
@@ -290,6 +292,10 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
            
            var lastReportedCount = 0
            
+            progress.cancellationHandler = { [weak mdquery] in
+                mdquery?.stop()
+            }
+            
            if let foundItemHandler = foundItemHandler {
                var updateObserver: NSObjectProtocol?
                
@@ -314,6 +320,7 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
                        }
                    }
                    lastReportedCount = mdquery.resultCount
+                    progress.totalUnitCount = Int64(lastReportedCount)
                    
                    mdquery.enableUpdates()
                })
@@ -346,12 +353,14 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
                        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))
@@ -359,6 +368,8 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
                }
            }
        }
+        
+        return progress
    }
    
    open override func isReachable(completionHandler: @escaping (Bool) -> Void) {
@@ -375,10 +386,10 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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? {
+    open override func create(folder folderName: String, at atPath: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        return super.create(folder: folderName, at: atPath, completionHandler: completionHandler)
    }
    
@@ -392,10 +403,10 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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? {
+    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)
    }
    
@@ -409,10 +420,10 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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? {
+    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)
    }
    
@@ -426,11 +437,10 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
     - 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? {
+    open override func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        return super.removeItem(path: path, completionHandler: completionHandler)
    }
    
@@ -443,13 +453,18 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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 operationHandle =  CloudOperationHandle(operationType: opType, baseURL: self.baseURL)
+        let progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.isCancellable = false
+        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, *) {
@@ -477,7 +492,7 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
                })
            }
        }
-        return operationHandle
+        return progress
    }
    
    /**
@@ -488,12 +503,17 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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(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 {
@@ -503,8 +523,8 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
            })
            return nil
        }
-        let handle = super.copyItem(path: path, toLocalURL: toLocalURL, completionHandler: completionHandler)
-        return handle
+        let _ = super.copyItem(path: path, toLocalURL: toLocalURL, completionHandler: completionHandler)
+        return progress
    }
    
    /**
@@ -516,11 +536,18 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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? {
-        return super.contents(path: path, completionHandler: completionHandler)
+    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(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: path, opType: operation, progress: progress)
+        _ = super.contents(path: path, completionHandler: completionHandler)
+        return progress
    }
    
    /**
@@ -534,11 +561,18 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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? {
-        return super.contents(path: path, offset: offset, length: length, completionHandler: completionHandler)
+    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(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        monitorFile(path: path, opType: operation, progress: progress)
+        _ = super.contents(path: path, offset: offset, length: length, completionHandler: completionHandler)
+        return progress
    }
    
    /**
@@ -550,11 +584,18 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
       - 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? {
-        return super.writeContents(path: path, contents: data, atomically: atomically, overwrite: overwrite, completionHandler: completionHandler)
+    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(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)]()
@@ -639,32 +680,40 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
        return file
    }
    
-    func monitorFile(path: String, opType: FileOperationType) {
+    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: .NSMetadataQueryDidFinishGathering, object: query, queue: nil, using: { (notification) in
+            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 {
@@ -676,6 +725,7 @@ open class CloudFileProvider: LocalFileProvider, FileProviderSharing {
            })
            
            DispatchQueue.main.async {
+                progress?.setUserInfoObject(Date(), forKey: .startingTimeKey)
                query.start()
            }
        }
@@ -745,92 +795,36 @@ public enum UbiquitousScope: RawRepresentable {
    }
 }

-/// Get progress of CloudFileProvider operations
-open class CloudOperationHandle: OperationHandle {
-    /// Url of file which operation is doing on
-    public let baseURL: URL?
-    /// Type of operation
-    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
 }
+*/
@@ -44,7 +44,7 @@ open class DropboxFileProvider: FileProviderBasicRemote {
    public var validatingCache: Bool
   
    fileprivate var _session: URLSession?
-    fileprivate var sessionDelegate: SessionDelegate?
+    internal fileprivate(set) var sessionDelegate: SessionDelegate?
    public var session: URLSession {
        get {
            if _session == nil {
@@ -153,7 +153,8 @@ open class DropboxFileProvider: FileProviderBasicRemote {
    }
    
    open func contentsOfDirectory(path: String, completionHandler: @escaping ((_ contents: [FileObject], _ error: Error?) -> Void)) {
-        list(path) { (contents, cursor, error) in
+        let progress = Progress(parent: nil, userInfo: nil)
+        list(path, progress: progress) { (contents, cursor, error) in
            completionHandler(contents, error)
        }
    }
@@ -198,12 +199,13 @@ 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 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)
@@ -214,7 +216,7 @@ 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)
                }
@@ -223,6 +225,7 @@ open class DropboxFileProvider: FileProviderBasicRemote {
                completionHandler(predicatedFiles, error)
            })
        }
+        return progress
    }
    
    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
@@ -235,27 +238,33 @@ open class DropboxFileProvider: FileProviderBasicRemote {
 }

 extension DropboxFileProvider: 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(_ operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    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 url: String
        guard let sourcePath = operation.source else { return nil }
        let destPath = operation.destination
@@ -288,15 +297,24 @@ extension DropboxFileProvider: FileProviderOperations {
            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))
            }
+            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 RemoteOperationHandle(operationType: operation, tasks: [task])
+        return progress
    }
    
-    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 {
@@ -312,22 +330,36 @@ extension DropboxFileProvider: FileProviderOperations {
        return upload_simple(toPath, localFile: localFile, overwrite: overwrite, operation: opType, completionHandler: completionHandler)
    }
    
-    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 url = URL(string: "files/download", relativeTo: contentURL)!
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        var request = URLRequest(url: url)
        request.set(httpAuthentication: credential, with: .oAuth2)
        request.set(dropboxArgKey: ["path": path as NSString])
        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = completionHandler
+        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
+            if error != nil {
+                progress.cancel()
+            }
+            completionHandler?(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 : FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: errorData ?? Data(), encoding: .utf8)) : nil
+                if serverError != nil {
+                    progress.cancel()
+                }
                completionHandler?(serverError)
                return
            }
@@ -339,13 +371,19 @@ extension DropboxFileProvider: FileProviderOperations {
            }
        }
        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
    }
 }

 extension DropboxFileProvider: FileProviderReadWrite {
-    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)
@@ -355,19 +393,31 @@ extension DropboxFileProvider: FileProviderReadWrite {
        
        let opType = FileOperationType.fetch(path: path)
        let url = URL(string: "files/download", relativeTo: contentURL)!
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        var request = URLRequest(url: url)
        request.set(httpAuthentication: credential, with: .oAuth2)
        request.set(rangeWithOffset: offset, length: length)
        request.set(dropboxArgKey: ["path": correctPath(path)! as NSString])
        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
+        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 : FileProviderDropboxError? = code != nil ? FileProviderDropboxError(code: code!, path: path, errorDescription: String(data: errorData ?? Data(), encoding: .utf8)) : nil
+                if serverError != nil {
+                    progress.cancel()
+                }
                completionHandler(nil, serverError)
                return
            }
@@ -379,11 +429,17 @@ extension DropboxFileProvider: 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
    }
    
-    public func writeContents(path: String, contents data: Data?, atomically: Bool, overwrite: Bool, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    public 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
@@ -71,7 +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 {
@@ -99,13 +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
                    }
                }
@@ -113,11 +118,15 @@ 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? {
+    func upload_simple(_ targetPath: String, data: Data? = nil, localFile: URL? = nil, modifiedDate: Date = Date(), overwrite: Bool, 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)
@@ -125,6 +134,13 @@ internal extension DropboxFileProvider {
            self.delegateNotify(.create(path: targetPath), error: error)
            return nil
        }
+        
+        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)
+        
        var requestDictionary = [String: AnyObject]()
        let url: URL
        url = URL(string: "files/upload", relativeTo: contentURL)!
@@ -151,15 +167,25 @@ internal extension DropboxFileProvider {
                // We can't fetch server result from delegate!
                responseError = FileProviderDropboxError(code: rCode, path: targetPath, errorDescription: nil)
            }
+            if !(responseError == nil && error == nil) {
+                progress.cancel()
+            }
            completionHandler?(responseError ?? error)
-            self?.delegateNotify(.create(path: targetPath), error: responseError ?? error)
+            self?.delegateNotify(.modify(path: targetPath), 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 RemoteOperationHandle(operationType: operation, tasks: [task])
+        return progress
    }
    
-    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)) {
+    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 }
+        
        let url = URL(string: "files/search", relativeTo: apiURL)!
        var request = URLRequest(url: url)
        request.httpMethod = "POST"
@@ -180,12 +206,13 @@ 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)
                    }
@@ -193,7 +220,11 @@ internal extension DropboxFileProvider {
                }
            }
            completionHandler(responseError ?? error)
-        }) 
+        })
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
        task.resume()
    }
 }
@@ -331,26 +331,27 @@ public struct LocalFileInformationGenerator {
            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 swift(>=4.0)
+        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
+            #else
                let commonKey = item.commonKey
-                #endif
-                if let description = makeDescription(commonKey) {
-                    if let value = item.stringValue {
-                        keys.append(description)
-                        dic[description] = value
-                    }
+            #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)
    }
@@ -421,21 +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
            }
@@ -446,29 +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)
    }
    
@@ -26,7 +26,7 @@ public class FileProviderStreamTask: URLSessionTask, StreamDelegate {
    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]()
    
@@ -121,8 +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.
@@ -133,7 +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
            }
@@ -192,6 +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")
    }
@@ -199,10 +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
@@ -218,10 +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
@@ -82,7 +82,8 @@ open class FTPFileProvider: FileProviderBasicRemote {
        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!.path.hasSuffix("/") ? urlComponents.url! : urlComponents.url!.appendingPathComponent("")).absoluteURL
@@ -278,12 +279,14 @@ open class FTPFileProvider: FileProviderBasicRemote {
        }
    }
    
-    open func searchFiles(path: String, recursive: Bool, query: NSPredicate, foundItemHandler: ((FileObject) -> Void)?, completionHandler: @escaping ((_ files: [FileObject], _ error: Error?) -> Void)) {
-        self.recursiveList(path: path, useMLST: true, foundItemsHandler: { items in
+    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 {
@@ -294,6 +297,7 @@ open class FTPFileProvider: FileProviderBasicRemote {
            let foundFiles = files.filter { query.evaluate(with: $0.mapPredicate()) }
            completionHandler(foundFiles, nil)
        })
+        return progress
    }
    
    public func url(of path: String?) -> URL {
@@ -329,24 +333,24 @@ 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
        }
@@ -368,7 +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
@@ -411,13 +418,12 @@ 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
@@ -425,31 +431,37 @@ extension FTPFileProvider: FileProviderOperations {
                        errorCode = URLError.cannotOpenFile
                    }
                    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) {
+        guard let sourcePath = opType.source else { return }
+        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)
@@ -458,39 +470,42 @@ extension FTPFileProvider: FileProviderOperations {
                return
            }
            
-            let secondOp = self.copyItem(localFile: localURL, to: destPath, completionHandler: { error in
+            progress.becomeCurrent(withPendingUnitCount: 1)
+            _ = self.copyItem(localFile: localURL, to: destPath) { error in
                completionHandler?(nil)
                self.delegateNotify(opType, error: nil)
-            }) as? RemoteOperationHandle
-            operationHandle.tasks = secondOp?.tasks ?? []
-        }) as? RemoteOperationHandle
-        operationHandle.tasks = firstOp?.tasks ?? []
-        return operationHandle
+            }
+            progress.resignCurrent()
+        }
+        progress.resignCurrent()
+        return
    }
    
-    private func fallbackRemove(_ opType: FileOperationType, on task: FileProviderStreamTask, completionHandler: SimpleCompletionHandler) {
+    private func fallbackRemove(_ opType: FileOperationType, progress: Progress, on task: FileProviderStreamTask, completionHandler: SimpleCompletionHandler) {
        guard let sourcePath = opType.source else { 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)
-                    self.delegateNotify(opType, error: error)
                }
+                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)
-                    self.delegateNotify(opType, error: error)
                }
+                self.delegateNotify(opType, error: error)
                return
            }
            
            if response.hasPrefix("50") {
-                self.fallbackRecursiveRemove(opType, on: task, completionHandler: completionHandler)
+                self.fallbackRecursiveRemove(opType, progress: progress, on: task, completionHandler: completionHandler)
                return
            }
            
@@ -500,15 +515,15 @@ extension FTPFileProvider: FileProviderOperations {
            }
            self.dispatch_queue.async {
                completionHandler?(error)
-                self.delegateNotify(opType, error: error)
            }
+            self.delegateNotify(opType, error: error)
        }
    }
    
-    private func fallbackRecursiveRemove(_ opType: FileOperationType, on task: FileProviderStreamTask, completionHandler: SimpleCompletionHandler) {
+    private func fallbackRecursiveRemove(_ opType: FileOperationType, progress: Progress, on task: FileProviderStreamTask, completionHandler: SimpleCompletionHandler) {
        guard let sourcePath = opType.source else { return }
        
-        self.recursiveList(path: sourcePath, useMLST: true, completionHandler: { (contents, error) in
+        _ = self.recursiveList(path: sourcePath, useMLST: true, completionHandler: { (contents, error) in
            if let error = error {
                self.dispatch_queue.async {
                    completionHandler?(error)
@@ -517,6 +532,8 @@ extension FTPFileProvider: FileProviderOperations {
                return
            }
            
+            let recursiveProgress = Progress(parent: progress, userInfo: nil)
+            recursiveProgress.totalUnitCount = Int64(contents.count)
            let sortedContents = contents.sorted(by: {
                $0.path.localizedStandardCompare($1.path) == .orderedDescending
            })
@@ -527,6 +544,7 @@ extension FTPFileProvider: FileProviderOperations {
            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)
@@ -536,7 +554,7 @@ extension FTPFileProvider: FileProviderOperations {
        })
    }
    
-    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 {
@@ -549,7 +567,11 @@ extension FTPFileProvider: FileProviderOperations {
        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
@@ -561,13 +583,21 @@ extension FTPFileProvider: FileProviderOperations {
                return
            }
            
-            self.ftpStore(task, filePath: self.ftpPath(toPath), fromData: nil, fromFile: localFile, onTask: {
-                operation.add(task: $0)
+            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(Double(totalSent) / Double(expectedBytes)))
+                    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)
@@ -576,15 +606,18 @@ 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 {
            self.attributesOfItem(path: path, completionHandler: { (file, error) in
@@ -605,6 +638,8 @@ extension FTPFileProvider: FileProviderOperations {
                    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
@@ -615,8 +650,13 @@ extension FTPFileProvider: FileProviderOperations {
                        completionHandler?(e)
                    }
                }
-                operation.add(task: task)
                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 {
@@ -629,13 +669,21 @@ extension FTPFileProvider: FileProviderOperations {
                    return
                }
                
-                self.ftpRetrieveFile(task, filePath: self.ftpPath(path), onTask: {
-                    operation.add(task: $0)
+                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)
@@ -653,20 +701,28 @@ extension FTPFileProvider: FileProviderOperations {
                }
            }
        }
-        return operation
+        return progress
    }
 }

 extension FTPFileProvider: FileProviderReadWrite {
-    open 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
@@ -678,14 +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 {
@@ -694,7 +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
@@ -705,13 +770,21 @@ extension FTPFileProvider: FileProviderReadWrite {
                return
            }
            
-            self.ftpRetrieveData(task, filePath: self.ftpPath(path), from: offset, length: length, onTask: {
-                operation.add(task: $0)
+            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)
@@ -728,16 +801,20 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
        }
        
-        return operation
+        return progress
    }
    
-    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 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 {
@@ -749,13 +826,21 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
            
            let storeHandler = {
-                self.ftpStore(task, filePath: self.ftpPath(path), fromData: data ?? Data(), fromFile: nil, onTask: {
-                    operation.add(task: $0)
+                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(Double(totalSent) / Double(expectedBytes)))
+                        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)
@@ -775,7 +860,7 @@ extension FTPFileProvider: FileProviderReadWrite {
            }
        }
        
-        return operation
+        return progress
    }
 }

@@ -80,6 +80,13 @@ internal 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
@@ -99,7 +106,7 @@ internal extension FTPFileProvider {
                return
            }
            
-            let loginHandle = {
+            let loginHandle: () -> Void = {
                self.execute(command: "USER \(credential?.user ?? "anonymous")", on: task) { (response, error) in
                    if let error = error {
                        completionHandler(error)
@@ -118,7 +125,7 @@ internal 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("23") ?? false {
                                completionHandler(nil)
@@ -135,7 +142,8 @@ internal extension FTPFileProvider {
                }
            }
            
-            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
                    if let error = error {
                        completionHandler(error)
@@ -144,6 +152,7 @@ internal extension FTPFileProvider {
                    
                    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)
@@ -152,9 +161,17 @@ internal extension FTPFileProvider {
                            
                            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 {
                loginHandle()
            }
@@ -219,7 +236,7 @@ internal extension FTPFileProvider {
            
            let passiveTask = self.session.fpstreamTask(withHostName: host, port: port)
            passiveTask.resume()
-            if self.baseURL?.scheme == "ftps" || self.baseURL?.port == 990 {
+            if self.baseURL?.scheme == "ftps" || self.baseURL?.scheme == "ftpes" || self.baseURL?.port == 990 {
                passiveTask.startSecureConnection()
            }
            completionHandler(passiveTask, nil)
@@ -238,6 +255,7 @@ internal extension FTPFileProvider {
        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()
@@ -381,8 +399,9 @@ internal extension FTPFileProvider {
        }
    }
    
-    func recursiveList(path: String, useMLST: Bool, foundItemsHandler: ((_ contents: [FileObject]) -> Void)? = nil, completionHandler: @escaping (_ contents: [FileObject], _ error: Error?) -> Void) {
-        let queue = DispatchQueue(label: "test")
+    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]()
@@ -397,12 +416,14 @@ internal extension FTPFileProvider {
                }
                
                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
+                    _=self.recursiveList(path: dir.path, useMLST: useMLST, foundItemsHandler: foundItemsHandler, completionHandler: { (contents, error) in
                        success = success && (error == nil)
                        if let error = error {
                            completionHandler([], error)
@@ -412,9 +433,11 @@ internal extension FTPFileProvider {
                        
                        foundItemsHandler?(files)
                        result.append(contentsOf: contents)
+                        
                        group.leave()
                    })
                }
+                progress.resignCurrent()
                group.leave()
            })
            group.wait()
@@ -425,6 +448,7 @@ internal extension FTPFileProvider {
                }
            }
        }
+        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) {
@@ -99,7 +99,8 @@ public protocol FileProviderBasic: class, 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, 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.
@@ -146,9 +149,9 @@ public protocol FileProviderBasic: class, NSSecureCoding {
 }

 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.
@@ -162,8 +165,6 @@ extension FileProviderBasic {
            operation_queue.maxConcurrentOperationCount = newValue
        }
    }
-    
-    
 }

 /// Checking equality of two file provider, regardless of current path queues and delegates.
@@ -241,7 +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 {
@@ -251,8 +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()
        }
    }
@@ -271,10 +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.
@@ -285,10 +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.
@@ -300,10 +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.
@@ -314,10 +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.
@@ -329,10 +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.
@@ -340,11 +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.
@@ -356,10 +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.
@@ -372,10 +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.
@@ -387,33 +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)
    }
 }
@@ -429,10 +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.
@@ -445,10 +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.
@@ -459,10 +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.
@@ -473,10 +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.
@@ -487,10 +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.
@@ -501,30 +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)
    }
 }
@@ -570,7 +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
 }
@@ -580,8 +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? {
@@ -1008,6 +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 }
@@ -1028,14 +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.
@@ -50,6 +50,11 @@ public extension URLResourceKey {
    public static let isEncryptedKey = URLResourceKey(rawValue: "NSURLIsEncryptedKey")
 }

+public extension ProgressUserInfoKey {
+    public static let fileProvderOperationTypeKey = ProgressUserInfoKey("FilesProviderOperationTypeKey")
+    public static let startingTimeKey = ProgressUserInfoKey("NSProgressstartingTimeKey")
+}
+
 internal extension URL {
    var uw_scheme: String {
        return self.scheme ?? ""
@@ -113,10 +118,28 @@ internal extension URLRequest {
        self.setValue(contentType.rawValue, forHTTPHeaderField: "Content-Type")
    }
    
-    mutating func set(dropboxArgKey requestDictionary: [String: AnyObject]) {
-        if let requestJson = String(jsonDictionary: requestDictionary) {
-            self.setValue(requestJson, forHTTPHeaderField: "Dropbox-API-Arg")
+    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")
    }
 }

@@ -173,22 +173,31 @@ 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)
+        
        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) {
@@ -200,13 +209,13 @@ 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) {
@@ -218,7 +227,7 @@ 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) {
@@ -232,13 +241,13 @@ 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))
@@ -250,7 +259,7 @@ 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)
    }
@@ -263,9 +272,12 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
    }
    
    @discardableResult
-    fileprivate func doOperation(_ opType: FileOperationType, data: Data? = nil, atomically: Bool = false, forUploading: Bool = false, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
-        let localOperationHandle = LocalOperationHandle(operationType: opType, baseURL: self.baseURL)
-
+    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)
@@ -299,23 +311,31 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
        
        let operationHandler: (URL, URL?) -> Void = { source, dest in
            do {
-                localOperationHandle.inProgress = true
+                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
@@ -324,7 +344,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                    source.stopAccessingSecurityScopedResource()
                }

-                localOperationHandle.inProgress = false
+                progress.completedUnitCount = progress.totalUnitCount
                self.dispatch_queue.async {
                    completionHandler?(nil)
                }
@@ -335,6 +355,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                if successfulSecurityScopedResourceAccess {
                    source.stopAccessingSecurityScopedResource()
                }
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler?(e)
                }
@@ -376,24 +397,31 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                operationHandler(source, dest)
            }
        }
-        return localOperationHandle
+        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 localOperationHandle = LocalOperationHandle(operationType: opType, baseURL: self.baseURL)
+        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)
+        
        let url = self.url(of: path)
-
+        progress.totalUnitCount = url.fileSize
+        
        let operationHandler: (URL) -> Void = { url in
+            progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
            do {
-                localOperationHandle.inProgress = true
                let data = try Data(contentsOf: url)
-                localOperationHandle.inProgress = false
+                progress.completedUnitCount = progress.totalUnitCount
                self.dispatch_queue.async {
                    completionHandler(data, nil)
                }
            } catch let e {
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler(nil, e)
                }
@@ -416,11 +444,11 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            }
        }

-        return localOperationHandle
+        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)
@@ -433,7 +461,12 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
        }

        let opType = FileOperationType.fetch(path: path)
-        let localOperationHandle = LocalOperationHandle(operationType: opType, baseURL: self.baseURL)
+        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)
+        
        let url = self.url(of: path)
        
        let operationHandler: (URL) -> Void = { url in
@@ -448,18 +481,19 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
                handle.closeFile()
            }

-            localOperationHandle.inProgress = true
            let size = LocalFileObject(fileWithURL: url)?.size ?? -1
+            progress.totalUnitCount = size
            guard size > offset else {
-                localOperationHandle.inProgress = false
+                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 {
-                localOperationHandle.inProgress = false
+                progress.cancel()
                self.dispatch_queue.async {
                    completionHandler(nil, self.throwError(path, code: CocoaError.fileReadTooLarge as FoundationErrorEnum))
                }
@@ -467,7 +501,7 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            }
            
            let data = handle.readData(ofLength: length)
-            localOperationHandle.inProgress = false
+            progress.completedUnitCount = progress.totalUnitCount
            self.dispatch_queue.async {
                completionHandler(data, nil)
            }
@@ -487,11 +521,11 @@ open class LocalFileProvider: FileProvider, FileProviderMonitor, FileProvideUndo
            }
        }
        
-        return localOperationHandle
+        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)
@@ -19,7 +19,7 @@ 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)
@@ -217,104 +217,6 @@ internal class LocalFileProviderManagerDelegate: NSObject, FileManagerDelegate {
    }
 }

-/// - Note: Local operation handling is limited. Please don't use as much as possible.
-open class LocalOperationHandle: OperationHandle {
-    /// Url of file which operation is doing on
-    public let baseURL: URL
-    /// Type of operation
-    public let operationType: FileOperationType
-    
-    init (operationType: FileOperationType, baseURL: URL?) {
-        self.baseURL = baseURL ?? URL(fileURLWithPath: "/")
-        self.operationType = operationType
-        inProgress = false
-    }
-    
-    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
-
-
-    /// 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
@@ -43,7 +43,7 @@ open class OneDriveFileProvider: FileProviderBasicRemote {
    public var validatingCache: Bool
   
    fileprivate var _session: URLSession?
-    fileprivate var sessionDelegate: SessionDelegate?
+    internal fileprivate(set) var sessionDelegate: SessionDelegate?
    public var session: URLSession {
        get {
            if _session == nil {
@@ -190,12 +190,13 @@ open class OneDriveFileProvider: FileProviderBasicRemote {
        task.resume()
    }
    
-    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? {
        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
+        guard let finalQueryStr = queryStr else { return nil }
+        let progress = Progress(parent: nil, userInfo: nil)
+        search(path, query: finalQueryStr, progress: progress, foundItem: { (file) in
            if query.evaluate(with: file.mapPredicate()) {
                foundFiles.append(file)
                foundItemHandler?(file)
@@ -203,6 +204,7 @@ open class OneDriveFileProvider: FileProviderBasicRemote {
        }, completionHandler: { (error) in
            completionHandler(foundFiles, error)
        })
+        return progress
    }
    
    open func url(of path: String? = nil, modifier: String? = nil) -> URL {
@@ -213,22 +215,24 @@ open class OneDriveFileProvider: FileProviderBasicRemote {
            rpath = self.currentPath
        }
        
+        let driveURL = baseURL!.appendingPathComponent("drive/\(drive):/")
+        
        if rpath.hasPrefix("/") {
-            rpath.remove(at: rpath.startIndex)
+            _=rpath.characters.removeFirst()
        }
        if rpath.isEmpty {
            if let modifier = modifier {
-                return baseURL!.appendingPathComponent("drive/\(drive)/\(modifier)")
+                return driveURL.appendingPathComponent(modifier)
            }
-            return baseURL!.appendingPathComponent("drive/\(drive)")
+            return driveURL
        }
-        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
+        
+        return  driveURL.appendingPathComponent(rpath)
    }
    
    open func isReachable(completionHandler: @escaping (Bool) -> Void) {
@@ -247,28 +251,33 @@ open class OneDriveFileProvider: FileProviderBasicRemote {

 extension OneDriveFileProvider: 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(_ operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    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)
+        
        guard let sourcePath = operation.source else { return nil }
        let destPath = operation.destination
        var request = URLRequest(url: url(of: sourcePath))
@@ -298,15 +307,24 @@ extension OneDriveFileProvider: FileProviderOperations {
            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))
            }
+            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 RemoteOperationHandle(operationType: operation, tasks: [task])
+        return progress
    }
    
-    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 {
@@ -322,20 +340,34 @@ extension OneDriveFileProvider: FileProviderOperations {
        return upload_simple(toPath, localFile: localFile, overwrite: overwrite, operation: opType, completionHandler: completionHandler)
    }
    
-    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
        }
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        var request = URLRequest(url: self.url(of: path, modifier: "content"))
        request.set(httpAuthentication: credential, with: .oAuth2)
        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = completionHandler
+        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
+            if error != nil {
+                progress.cancel()
+            }
+            completionHandler?(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
+                if serverError != nil {
+                    progress.cancel()
+                }
                completionHandler?(serverError)
                return
            }
@@ -347,13 +379,19 @@ extension OneDriveFileProvider: FileProviderOperations {
            }
        }
        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
    }
 }

 extension OneDriveFileProvider: FileProviderReadWrite {
-    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)
@@ -362,19 +400,31 @@ extension OneDriveFileProvider: FileProviderReadWrite {
        }
        
        let opType = FileOperationType.fetch(path: path)
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        var request = URLRequest(url: self.url(of: path, modifier: "content"))
        request.httpMethod = "GET"
        request.set(httpAuthentication: credential, with: .oAuth2)
        request.set(rangeWithOffset: offset, length: length)
        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
+        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
+                if serverError != nil {
+                    progress.cancel()
+                }
                completionHandler(nil, serverError)
                return
            }
@@ -386,11 +436,17 @@ extension OneDriveFileProvider: 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
    }
    
-    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 opType = FileOperationType.modify(path: path)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
@@ -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.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed) ?? path
+        var rpath = (URL(string:path)?.appendingPathComponent(name).absoluteString)!
        if rpath.hasPrefix("/") {
-            rpath.remove(at: rpath.startIndex)
+            _=rpath.characters.removeFirst()
        }
        let url = URL(string: rpath, relativeTo: baseURL) ?? URL(string: rpath)!
-        super.init(url: url, name: name, path: path)
+        
+        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
    }
@@ -113,7 +114,7 @@ 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? {
+    func upload_simple(_ targetPath: String, data: Data? = nil, localFile: URL? = nil, modifiedDate: Date = Date(), overwrite: Bool, operation: FileOperationType, completionHandler: SimpleCompletionHandler) -> Progress? {
        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)
@@ -121,6 +122,13 @@ internal extension OneDriveFileProvider {
            self.delegateNotify(.create(path: targetPath), error: error)
            return nil
        }
+        
+        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 queryStr = overwrite ? "" : "?@name.conflictBehavior=fail"
        let url = self.url(of: targetPath, modifier: "content\(queryStr)")
        var request = URLRequest(url: url)
@@ -142,15 +150,27 @@ internal extension OneDriveFileProvider {
                // We can't fetch server result from delegate!
                responseError = FileProviderOneDriveError(code: rCode, path: targetPath, errorDescription: nil)
            }
+            if !(responseError == nil && error == nil) {
+                progress.cancel()
+            }
            completionHandler?(responseError ?? error)
            self?.delegateNotify(.create(path: targetPath), 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 RemoteOperationHandle(operationType: operation, tasks: [task])
+        return progress
    }
    
-    func search(_ startPath: String = "", query: String, next: URL? = nil, foundItem:@escaping ((_ file: OneDriveFileObject) -> Void), completionHandler: @escaping ((_ error: Error?) -> Void)) {
+    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
+        }
+        
        let url: URL
        let q = query.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed)!
        url = next ?? self.url(of: startPath, modifier: "view.search?q=\(q)")
@@ -171,8 +191,8 @@ 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 +200,11 @@ internal extension OneDriveFileProvider {
                }
            }
            completionHandler(responseError ?? error)
-        }) 
+        })
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
        task.resume()
    }
 }
@@ -8,67 +8,6 @@

 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 {
@@ -140,8 +79,49 @@ final public class SessionDelegate: NSObject, URLSessionDataDelegate, URLSession
        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:
+                break
+            }
+        }
+        super.observeValue(forKeyPath: keyPath, of: object, change: change, context: context)
+    }
+    
    // codebeat:disable[ARITY]
    public func urlSession(_ session: URLSession, task: URLSessionTask, didCompleteWithError error: Error?) {
+        task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesReceived))
+        task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesExpectedToReceive))
+        task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesSent))
+        task.removeObserver(self, forKeyPath: #keyPath(URLSessionTask.countOfBytesReceived))
+        
        if !(error == nil && task is URLSessionDownloadTask) {
            let completionHandler = completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] ?? nil
            completionHandler?(error)
@@ -74,53 +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)) {
@@ -171,7 +171,7 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        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)
@@ -258,7 +258,7 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        })
    }
    
-    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 url = self.url(of: path)
        var request = URLRequest(url: url)
        request.httpMethod = "PROPFIND"
@@ -266,7 +266,8 @@ open class WebDAVFileProvider: FileProviderBasicRemote {
        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)
+        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) {
@@ -282,13 +283,20 @@ 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) {
@@ -310,30 +318,16 @@ open class WebDAVFileProvider: FileProviderBasicRemote {

 extension WebDAVFileProvider: FileProviderOperations {
    @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) + "/")
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
-        let url = self.url(of: atPath).appendingPathComponent(folderName, isDirectory: true)
-        var request = URLRequest(url: url)
-        request.httpMethod = "MKCOL"
-        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?(responseError ?? error)
-            self.delegateNotify(opType, error: responseError ?? error)
-        })
-        task.taskDescription = opType.json
-        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
+        return self.doOperation(operation: opType, overwrite: false, 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)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
@@ -342,7 +336,7 @@ extension WebDAVFileProvider: FileProviderOperations {
    }
    
    @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)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
@@ -351,7 +345,7 @@ extension WebDAVFileProvider: FileProviderOperations {
    }
    
    @discardableResult
-    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> OperationHandle? {
+    open func removeItem(path: String, completionHandler: SimpleCompletionHandler) -> Progress? {
        let opType = FileOperationType.remove(path: path)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
@@ -359,7 +353,7 @@ extension WebDAVFileProvider: FileProviderOperations {
        return self.doOperation(operation: opType, completionHandler: completionHandler)
    }
    
-    fileprivate func doOperation(operation opType: FileOperationType, overwrite: Bool? = nil, completionHandler: SimpleCompletionHandler) -> OperationHandle?  {
+    fileprivate func doOperation(operation opType: FileOperationType, overwrite: Bool? = nil, completionHandler: SimpleCompletionHandler) -> Progress?  {
        let source = opType.source!
        let sourceURL = self.url(of: source)
        var request = URLRequest(url: sourceURL)
@@ -367,6 +361,8 @@ extension WebDAVFileProvider: FileProviderOperations {
            request.setValue(url(of:dest).absoluteString, forHTTPHeaderField: "Destination")
        }
        switch opType {
+        case .create:
+            request.httpMethod = "MKCOL"
        case .copy:
            request.httpMethod = "COPY"
        case .move:
@@ -377,6 +373,11 @@ extension WebDAVFileProvider: FileProviderOperations {
            return nil
        }
        
+        let progress = Progress(totalUnitCount: 1)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        request.set(httpAuthentication: credential, with: credentialType)
        if let overwrite = overwrite, !overwrite {
            request.setValue("F", forHTTPHeaderField: "Overwrite")
@@ -392,9 +393,17 @@ extension WebDAVFileProvider: FileProviderOperations {
                    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)
+                        progress.cancel()
                    }
                }
            }
+            
+            if responseError == nil && error == nil {
+                progress.completedUnitCount = 1
+            } else {
+                progress.cancel()
+            }
+            
            if (response as? HTTPURLResponse)?.statusCode ?? 0 != FileProviderHTTPErrorCode.multiStatus.rawValue {
                completionHandler?(responseError ?? error)
            }
@@ -402,12 +411,16 @@ extension WebDAVFileProvider: FileProviderOperations {
            self.delegateNotify(opType, error: responseError ?? error)
        })
        task.taskDescription = opType.json
+        progress.cancellationHandler = { [weak task] in
+            task?.cancel()
+        }
+        progress.setUserInfoObject(Date(), forKey: .startingTimeKey)
        task.resume()
-        return RemoteOperationHandle(operationType: opType, tasks: [task])
+        return progress
    }
    
    @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? {
        // check file is not a folder
        guard (try? localFile.resourceValues(forKeys: [.fileResourceTypeKey]))?.fileResourceType ?? .unknown == .regular else {
            dispatch_queue.async {
@@ -420,6 +433,13 @@ extension WebDAVFileProvider: FileProviderOperations {
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        progress.totalUnitCount = localFile.fileSize
+        
        let url = self.url(of:toPath)
        var request = URLRequest(url: url)
        if !overwrite {
@@ -434,25 +454,44 @@ extension WebDAVFileProvider: FileProviderOperations {
                // We can't fetch server result from delegate!
                responseError = FileProviderWebDavError(code: rCode, path: toPath, errorDescription: nil, url: url)
            }
+            if !(responseError == nil && error == nil) {
+                progress.cancel()
+            }
            completionHandler?(responseError ?? error)
            self?.delegateNotify(.create(path: toPath), error: responseError ?? error)
        }
        task.taskDescription = opType.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 RemoteOperationHandle(operationType: opType, tasks: [task])
+        return progress
    }
    
    @discardableResult
-    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
        }
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        let url = self.url(of:path)
        var request = URLRequest(url: url)
        request.set(httpAuthentication: credential, with: credentialType)
        let task = session.downloadTask(with: request)
-        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = completionHandler
+        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
+            if error != nil {
+                progress.cancel()
+            }
+            completionHandler?(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)
@@ -468,14 +507,20 @@ extension WebDAVFileProvider: FileProviderOperations {
            }
        }
        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
    }
 }

 extension WebDAVFileProvider: FileProviderReadWrite {
    @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)
@@ -484,17 +529,26 @@ extension WebDAVFileProvider: FileProviderReadWrite {
        }
        
        let opType = FileOperationType.fetch(path: path)
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        
        let url = self.url(of: path)
        var request = URLRequest(url: url)
        request.set(httpAuthentication: credential, with: credentialType)
        request.set(rangeWithOffset: offset, length: length)
        
        let task = session.downloadTask(with: request)
-        let handle = RemoteOperationHandle(operationType: opType, tasks: [task])
        completionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { error in
+            if error != nil {
+                progress.cancel()
+            }
+            
            completionHandler(nil, error)
        }
-        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { tempURL in
+        downloadCompletionHandlersForTasks[session.sessionDescription!]?[task.taskIdentifier] = { [weak self] 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
@@ -503,7 +557,7 @@ extension WebDAVFileProvider: FileProviderReadWrite {
            }
            do {
                let data = try Data(contentsOf: tempURL)
-                self.dispatch_queue.async {
+                (self?.dispatch_queue ?? DispatchQueue.global()).async {
                    completionHandler(data, nil)
                }
            } catch let e {
@@ -511,16 +565,29 @@ extension WebDAVFileProvider: 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 handle
+        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 opType = FileOperationType.modify(path: path)
        guard fileOperationDelegate?.fileProvider(self, shouldDoOperation: opType) ?? true == true else {
            return nil
        }
+        
+        var progress = Progress(parent: nil, userInfo: nil)
+        progress.setUserInfoObject(opType, forKey: .fileProvderOperationTypeKey)
+        progress.kind = .file
+        progress.setUserInfoObject(Progress.FileOperationKind.downloading, forKey: .fileOperationKindKey)
+        progress.totalUnitCount = Int64(data?.count ?? 0)
+        
        // FIXME: lock destination before writing process
        let url = atomically ? self.url(of: path).appendingPathExtension("tmp") : self.url(of: path)
        var request = URLRequest(url: url)
@@ -536,12 +603,20 @@ extension WebDAVFileProvider: FileProviderReadWrite {
                // We can't fetch server result from delegate!
                responseError = FileProviderWebDavError(code: rCode, path: path, errorDescription: nil, url: url)
            }
+            if !(responseError == nil && error == nil) {
+                progress.cancel()
+            }
            completionHandler?(responseError ?? error)
            self?.delegateNotify(opType, error: responseError ?? error)
        }
        task.taskDescription = opType.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 RemoteOperationHandle(operationType: opType, tasks: [task])
+        return progress
    }
    
    /*
Author	SHA1	Message	Date
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