Make filename argument optional instead of using empty string.

azure/src/main/java/ch/cyberduck/core/azure/AzureDirectoryFeature.java

@@ -32,6 +32,7 @@ import org.apache.commons.lang3.StringUtils;
 
 import java.text.MessageFormat;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import com.azure.core.exception.HttpResponseException;
 
@@ -69,28 +70,28 @@ public class AzureDirectoryFeature implements Directory<Void> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
-            if(!validate(filename)) {
+            if(filename.isPresent()) {
-                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+                if(!validate(filename.get())) {
+                    throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+                }
             }
+            // Empty argument if not known in validation
         }
     }
 
     public static boolean validate(final String filename) {
-        // Empty argument if not known in validation
+        // Container names must be lowercase, between 3-63 characters long and must start with a letter or
-        if(StringUtils.isNotBlank(filename)) {
+        // number. Container names may contain only letters, numbers, and the dash (-) character.
-            // Container names must be lowercase, between 3-63 characters long and must start with a letter or
+        if(StringUtils.length(filename) > 63) {
-            // number. Container names may contain only letters, numbers, and the dash (-) character.
+            return false;
-            if(StringUtils.length(filename) > 63) {
+        }
-                return false;
+        if(StringUtils.length(filename) < 3) {
-            }
+            return false;
-            if(StringUtils.length(filename) < 3) {
+        }
-                return false;
+        if(!StringUtils.isAlphanumeric(RegExUtils.removeAll(filename, "-"))) {
-            }
+            return false;
-            if(!StringUtils.isAlphanumeric(RegExUtils.removeAll(filename, "-"))) {
-                return false;
-            }
         }
         return true;
     }

azure/src/main/java/ch/cyberduck/core/azure/AzureTouchFeature.java

@@ -26,6 +26,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import org.apache.commons.io.input.NullInputStream;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class AzureTouchFeature extends DefaultTouchFeature<Void> {
 
@@ -34,7 +35,7 @@ public class AzureTouchFeature extends DefaultTouchFeature<Void> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);
         }

azure/src/test/java/ch/cyberduck/core/azure/AzureDirectoryFeatureTest.java

@@ -16,6 +16,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -38,8 +39,8 @@ public class AzureDirectoryFeatureTest extends AbstractAzureTest {
     public void testCreateContainerInvalidName() throws Exception {
         final Path container = new Path("untitled folder", EnumSet.of(Path.Type.directory));
         final AzureDirectoryFeature feature = new AzureDirectoryFeature(session);
-        assertFalse(feature.isSupported(container.getParent(), container.getName()));
+        assertFalse(feature.isSupported(container.getParent(), Optional.of(container.getName())));
-        assertThrows(InvalidFilenameException.class, () -> feature.preflight(container.getParent(), container.getName()));
+        assertThrows(InvalidFilenameException.class, () -> feature.preflight(container.getParent(), Optional.of(container.getName())));
         feature.mkdir(new AzureWriteFeature(session), container, new TransferStatus());
         assertTrue(new AzureFindFeature(session).find(container));
         new AzureDeleteFeature(session).delete(Collections.singletonList(container), LoginCallback.noop, new Delete.DisabledCallback());

azure/src/test/java/ch/cyberduck/core/azure/AzureTouchFeatureTest.java

@@ -28,6 +28,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 @Category(IntegrationTest.class)
 public class AzureTouchFeatureTest extends AbstractAzureTest {
@@ -44,9 +45,9 @@ public class AzureTouchFeatureTest extends AbstractAzureTest {
     public void testPreflightFilename() throws Exception {
         final Path container = new Path("cyberduck", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final AzureTouchFeature feature = new AzureTouchFeature(session);
-        feature.preflight(container, new AsciiRandomStringService().random());
+        feature.preflight(container, Optional.of(new AsciiRandomStringService().random()));
-        feature.preflight(container, new AlphanumericRandomStringService().random());
+        feature.preflight(container, Optional.of(new AlphanumericRandomStringService().random()));
-        feature.preflight(container, String.format("%s.suffix", new AlphanumericRandomStringService().random()));
+        feature.preflight(container, Optional.of(String.format("%s.suffix", new AlphanumericRandomStringService().random())));
-        feature.preflight(container, "?");
+        feature.preflight(container, Optional.of("?"));
     }
 }

backblaze/src/main/java/ch/cyberduck/core/b2/B2DirectoryFeature.java

@@ -33,6 +33,7 @@ import org.apache.commons.lang3.StringUtils;
 import java.io.IOException;
 import java.text.MessageFormat;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import synapticloop.b2.BucketType;
 import synapticloop.b2.exception.B2ApiException;
@@ -79,23 +80,23 @@ public class B2DirectoryFeature implements Directory<BaseB2Response> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             // Empty argument if not known in validation
-            if(StringUtils.isNotBlank(filename)) {
+            if(filename.isPresent()) {
                 // Bucket names must be a minimum of 6 and a maximum of 50 characters long, and must be globally unique;
                 // two different B2 accounts cannot have buckets with the name name. Bucket names can consist of: letters,
                 // digits, and "-". Bucket names cannot start with "b2-"; these are reserved for internal Backblaze use.
-                if(StringUtils.startsWith(filename, "b2-")) {
+                if(StringUtils.startsWith(filename.get(), "b2-")) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
-                if(StringUtils.length(filename) > 50) {
+                if(StringUtils.length(filename.get()) > 50) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
-                if(StringUtils.length(filename) < 6) {
+                if(StringUtils.length(filename.get()) < 6) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
-                if(!StringUtils.isAlphanumeric(RegExUtils.removeAll(filename, "-"))) {
+                if(!StringUtils.isAlphanumeric(RegExUtils.removeAll(filename.get(), "-"))) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
             }

backblaze/src/main/java/ch/cyberduck/core/b2/B2TouchFeature.java

@@ -26,6 +26,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import org.apache.commons.io.input.NullInputStream;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import synapticloop.b2.response.BaseB2Response;
 
@@ -41,7 +42,7 @@ public class B2TouchFeature extends DefaultTouchFeature<BaseB2Response> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         // Creating files is only possible inside a bucket.
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);

backblaze/src/test/java/ch/cyberduck/core/b2/B2DirectoryFeatureTest.java

@@ -31,6 +31,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -42,7 +43,7 @@ public class B2DirectoryFeatureTest extends AbstractB2Test {
         final Path bucket = new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory, Path.Type.volume));
         final B2VersionIdProvider fileid = new B2VersionIdProvider(session);
         final B2DirectoryFeature feature = new B2DirectoryFeature(session, fileid);
-        assertTrue(feature.isSupported(bucket.getParent(), bucket.getName()));
+        assertTrue(feature.isSupported(bucket.getParent(), Optional.of(bucket.getName())));
         feature.mkdir(new B2WriteFeature(session, fileid), bucket, new TransferStatus());
         assertThrows(ConflictException.class, () -> feature.mkdir(new B2WriteFeature(session, fileid), bucket, new TransferStatus()));
         new B2DeleteFeature(session, fileid).delete(Collections.singletonList(bucket), LoginCallback.noop, new Delete.DisabledCallback());
@@ -65,7 +66,7 @@ public class B2DirectoryFeatureTest extends AbstractB2Test {
     public void testBucketInvalidCharacter() throws Exception {
         final Path bucket = new Path("untitled folder", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final B2VersionIdProvider fileid = new B2VersionIdProvider(session);
-        assertFalse(new B2DirectoryFeature(session, fileid).isSupported(bucket.getParent(), bucket.getName()));
+        assertFalse(new B2DirectoryFeature(session, fileid).isSupported(bucket.getParent(), Optional.of(bucket.getName())));
         try {
             new B2DirectoryFeature(session, fileid).mkdir(new B2WriteFeature(session, fileid), bucket, new TransferStatus());
         }

box/src/main/java/ch/cyberduck/core/box/BoxDirectoryFeature.java

@@ -30,6 +30,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.text.MessageFormat;
 import java.util.Collections;
+import java.util.Optional;
 
 public class BoxDirectoryFeature implements Directory<File> {
 
@@ -55,9 +56,11 @@ public class BoxDirectoryFeature implements Directory<File> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!BoxTouchFeature.validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            if(!BoxTouchFeature.validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            }
         }
     }
 }

box/src/main/java/ch/cyberduck/core/box/BoxTouchFeature.java

@@ -25,6 +25,7 @@ import ch.cyberduck.core.shared.DefaultTouchFeature;
 import org.apache.commons.lang3.StringUtils;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class BoxTouchFeature extends DefaultTouchFeature<File> {
 
@@ -33,9 +34,11 @@ public class BoxTouchFeature extends DefaultTouchFeature<File> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
     }
 

box/src/test/java/ch/cyberduck/core/box/BoxDirectoryFeatureTest.java

@@ -30,6 +30,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -53,11 +54,11 @@ public class BoxDirectoryFeatureTest extends AbstractBoxTest {
     @Test
     public void isSupported() {
         final BoxFileidProvider fileid = new BoxFileidProvider(session);
-        assertTrue(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), new AlphanumericRandomStringService().random()));
+        assertTrue(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), Optional.of(new AlphanumericRandomStringService().random())));
-        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), String.format("%s ", new AlphanumericRandomStringService().random())));
+        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), Optional.of(String.format("%s ", new AlphanumericRandomStringService().random()))));
-        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), String.format("%s\\", new AlphanumericRandomStringService().random())));
+        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), Optional.of(String.format("%s\\", new AlphanumericRandomStringService().random()))));
-        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), String.format("%s/", new AlphanumericRandomStringService().random())));
+        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), Optional.of(String.format("%s/", new AlphanumericRandomStringService().random()))));
-        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), "."));
+        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), Optional.of(".")));
-        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), ".."));
+        assertFalse(new BoxDirectoryFeature(session, fileid).isSupported(Home.root(), Optional.of("..")));
     }
 }

box/src/test/java/ch/cyberduck/core/box/BoxTouchFeatureTest.java

@@ -21,6 +21,8 @@ import ch.cyberduck.test.IntegrationTest;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
+import java.util.Optional;
+
 import static org.junit.Assert.assertTrue;
 
 @Category(IntegrationTest.class)
@@ -29,6 +31,6 @@ public class BoxTouchFeatureTest extends AbstractBoxTest {
     @Test
     public void testSupported() {
         final BoxFileidProvider fileid = new BoxFileidProvider(session);
-        assertTrue(new BoxTouchFeature(session, fileid).isSupported(Home.root(), "xacjivli-éf"));
+        assertTrue(new BoxTouchFeature(session, fileid).isSupported(Home.root(), Optional.of("xacjivli-éf")));
     }
 }

core/src/main/java/ch/cyberduck/core/features/Directory.java

@@ -22,6 +22,7 @@ import ch.cyberduck.core.exception.BackgroundException;
 import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 /**
  * Create new folder on server
@@ -43,10 +44,10 @@ public interface Directory<Reply> {
 
     /**
      * @param workdir  Working directory in browser
-     * @param filename Folder name or null if unknown
+     * @param filename Folder name if known
      * @return True if creating directory is supported in the working directory
      */
-    default boolean isSupported(final Path workdir, final String filename) {
+    default boolean isSupported(final Path workdir, final Optional<String> filename) {
         try {
             this.preflight(workdir, filename);
             return true;
@@ -59,7 +60,7 @@ public interface Directory<Reply> {
     /**
      * @throws AccessDeniedException Permission failure for target directory
      */
-    default void preflight(final Path workdir, final String filename) throws BackgroundException {
+    default void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(!workdir.attributes().getPermission().isWritable()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString(
                     "Cannot create folder {0}", "Error"), filename)).withFile(workdir);

core/src/main/java/ch/cyberduck/core/features/Touch.java

@@ -40,7 +40,7 @@ public interface Touch<Reply> {
      * @param filename Relative filename
      * @return True if creating an empty file is possible.
      */
-    default boolean isSupported(final Path workdir, final String filename) {
+    default boolean isSupported(final Path workdir, final java.util.Optional<String> filename) {
         try {
             this.preflight(workdir, filename);
             return true;
@@ -53,7 +53,7 @@ public interface Touch<Reply> {
     /**
      * @throws AccessDeniedException Permission failure for target directory
      */
-    default void preflight(final Path workdir, final String filename) throws BackgroundException {
+    default void preflight(final Path workdir, final java.util.Optional<String> filename) throws BackgroundException {
         if(!workdir.attributes().getPermission().isWritable()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString(
                     "Cannot create {0}", "Error"), filename)).withFile(workdir);

core/src/main/java/ch/cyberduck/core/vault/registry/VaultRegistryDirectoryFeature.java

@@ -24,6 +24,8 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import ch.cyberduck.core.vault.VaultRegistry;
 import ch.cyberduck.core.vault.VaultUnlockCancelException;
 
+import java.util.Optional;
+
 public class VaultRegistryDirectoryFeature<Reply> implements Directory<Reply> {
 
     private final Session<?> session;
@@ -42,7 +44,7 @@ public class VaultRegistryDirectoryFeature<Reply> implements Directory<Reply> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         try {
             registry.find(session, workdir, false).getFeature(session, Directory.class, proxy).preflight(workdir, filename);
         }

core/src/main/java/ch/cyberduck/core/vault/registry/VaultRegistryTouchFeature.java

@@ -24,6 +24,8 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import ch.cyberduck.core.vault.VaultRegistry;
 import ch.cyberduck.core.vault.VaultUnlockCancelException;
 
+import java.util.Optional;
+
 public class VaultRegistryTouchFeature<R> implements Touch<R> {
 
     private final Session<?> session;
@@ -42,7 +44,7 @@ public class VaultRegistryTouchFeature<R> implements Touch<R> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         try {
             registry.find(session, workdir, false).getFeature(session, Touch.class, proxy).preflight(workdir, filename);
         }

cryptomator/legacy/src/main/java/ch/cyberduck/core/cryptomator/legacy/features/CryptoDirectoryV6Feature.java

@@ -28,6 +28,8 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import java.util.Optional;
+
 public class CryptoDirectoryV6Feature<Reply> implements Directory<Reply> {
     private static final Logger log = LogManager.getLogger(CryptoDirectoryV6Feature.class);
 
@@ -65,12 +67,12 @@ public class CryptoDirectoryV6Feature<Reply> implements Directory<Reply> {
     }
 
     @Override
-    public boolean isSupported(final Path workdir, final String name) {
+    public boolean isSupported(final Path workdir, final Optional<String> name) {
         return delegate.isSupported(workdir, name);
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         delegate.preflight(cryptomator.encrypt(session, workdir), filename);
     }
 

cryptomator/legacy/src/main/java/ch/cyberduck/core/cryptomator/legacy/features/CryptoDirectoryV7Feature.java

@@ -30,6 +30,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.util.EnumSet;
+import java.util.Optional;
 
 public class CryptoDirectoryV7Feature<Reply> implements Directory<Reply> {
     private static final Logger log = LogManager.getLogger(CryptoDirectoryV7Feature.class);
@@ -73,12 +74,12 @@ public class CryptoDirectoryV7Feature<Reply> implements Directory<Reply> {
     }
 
     @Override
-    public boolean isSupported(final Path workdir, final String name) {
+    public boolean isSupported(final Path workdir, final Optional<String> name) {
         return delegate.isSupported(workdir, name);
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         delegate.preflight(cryptomator.encrypt(session, workdir), filename);
     }
 

cryptomator/legacy/src/main/java/ch/cyberduck/core/cryptomator/legacy/features/CryptoTouchFeature.java

@@ -31,6 +31,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import org.cryptomator.cryptolib.api.FileHeader;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class CryptoTouchFeature<Reply> implements Touch<Reply> {
 
@@ -65,9 +66,11 @@ public class CryptoTouchFeature<Reply> implements Touch<Reply> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!cryptomator.getFilenameProvider().isValid(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!cryptomator.getFilenameProvider().isValid(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
         proxy.preflight(cryptomator.encrypt(session, workdir), filename);
     }

cryptomator/legacy/src/test/java/ch/cyberduck/core/cryptomator/legacy/CryptomatorVaultTest.java

@@ -401,17 +401,11 @@ public class CryptomatorVaultTest {
             public <T> T _getFeature(final Class<T> type) {
                 if(type == Directory.class) {
                     return (T) new Directory() {
-
                         @Override
                         public Path mkdir(final Write writer, final Path folder, final TransferStatus status) {
                             assertTrue(folder.equals(home) || folder.isChild(home));
                             return folder;
                         }
-
-                        @Override
-                        public boolean isSupported(final Path workdir, final String name) {
-                            throw new UnsupportedOperationException();
-                        }
                     };
                 }
                 return super._getFeature(type);

cryptomator/src/main/java/ch/cyberduck/core/cryptomator/features/CryptoDirectoryFeature.java

@@ -31,6 +31,7 @@ import org.apache.logging.log4j.Logger;
 import org.cryptomator.cryptolib.api.DirectoryMetadata;
 
 import java.util.EnumSet;
+import java.util.Optional;
 
 public class CryptoDirectoryFeature<Reply> implements Directory<Reply> {
     private static final Logger log = LogManager.getLogger(CryptoDirectoryFeature.class);
@@ -87,13 +88,13 @@ public class CryptoDirectoryFeature<Reply> implements Directory<Reply> {
     }
 
     @Override
-    public boolean isSupported(final Path workdir, final String name) {
+    public boolean isSupported(final Path workdir, final Optional<String> name) {
         return delegate.isSupported(workdir, name);
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        vault.getDirectoryProvider().createDirectoryId(new Path(workdir, filename, EnumSet.of(Path.Type.directory)));
+        filename.ifPresent(s -> vault.getDirectoryProvider().createDirectoryId(new Path(workdir, s, EnumSet.of(Path.Type.directory))));
         delegate.preflight(vault.encrypt(session, workdir), filename);
     }
 

cryptomator/src/main/java/ch/cyberduck/core/cryptomator/features/CryptoTouchFeature.java

@@ -31,6 +31,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import org.cryptomator.cryptolib.api.FileHeader;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class CryptoTouchFeature<Reply> implements Touch<Reply> {
 
@@ -65,9 +66,11 @@ public class CryptoTouchFeature<Reply> implements Touch<Reply> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!vault.getFilenameProvider().isValid(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!vault.getFilenameProvider().isValid(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
         proxy.preflight(vault.encrypt(session, workdir), filename);
     }

cryptomator/src/test/java/ch/cyberduck/core/cryptomator/impl/v8/CryptomatorVaultTest.java

@@ -354,11 +354,6 @@ public class CryptomatorVaultTest {
                             assertTrue(folder.equals(home) || folder.isChild(home));
                             return folder;
                         }
-
-                        @Override
-                        public boolean isSupported(final Path workdir, final String name) {
-                            throw new UnsupportedOperationException();
-                        }
                     };
                 }
                 return super._getFeature(type);

ctera/src/main/java/ch/cyberduck/core/ctera/CteraDirectoryFeature.java

@@ -22,6 +22,7 @@ import ch.cyberduck.core.exception.BackgroundException;
 import ch.cyberduck.core.exception.InvalidFilenameException;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.CREATEDIRECTORIESPERMISSION;
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.assumeRole;
@@ -34,10 +35,12 @@ public class CteraDirectoryFeature extends DAVDirectoryFeature {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            if(!validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            }
+            assumeRole(workdir, filename.get(), CREATEDIRECTORIESPERMISSION);
         }
-        assumeRole(workdir, filename, CREATEDIRECTORIESPERMISSION);
     }
 }

ctera/src/main/java/ch/cyberduck/core/ctera/CteraTouchFeature.java

@@ -27,6 +27,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.*;
 
@@ -39,9 +40,11 @@ public class CteraTouchFeature extends DAVTouchFeature {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
 
         // File/directory creation summary:

ctera/src/test/java/ch/cyberduck/core/ctera/CteraDirectoryFeatureTest.java

@@ -32,6 +32,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.CREATEDIRECTORIESPERMISSION;
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.READPERMISSION;
@@ -54,21 +55,21 @@ public class CteraDirectoryFeatureTest extends AbstractCteraTest {
     public void testPreflightFileMissingCustomProps() throws Exception {
         final Path workdir = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         workdir.setAttributes(workdir.attributes().setAcl(Acl.EMPTY));
-        new CteraDirectoryFeature(session).preflight(workdir, new AlphanumericRandomStringService().random());
+        new CteraDirectoryFeature(session).preflight(workdir, Optional.of(new AlphanumericRandomStringService().random()));
     }
 
     @Test
     public void testPreflightFileAccessDeniedCustomProps() throws Exception {
         final Path workdir = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         workdir.setAttributes(workdir.attributes().setAcl(new Acl(new Acl.CanonicalUser(), READPERMISSION)));
-        assertThrows(AccessDeniedException.class, () -> new CteraDirectoryFeature(session).preflight(workdir, new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new CteraDirectoryFeature(session).preflight(workdir, Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
     public void testPreflightFileAccessGrantedCustomProps() throws Exception {
         final Path workdir = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         workdir.setAttributes(workdir.attributes().setAcl(new Acl(new Acl.CanonicalUser(), CREATEDIRECTORIESPERMISSION)));
-        new CteraDirectoryFeature(session).preflight(workdir, new AlphanumericRandomStringService().random());
+        new CteraDirectoryFeature(session).preflight(workdir, Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
     }
 }

ctera/src/test/java/ch/cyberduck/core/ctera/CteraTouchFeatureTest.java

@@ -26,6 +26,7 @@ import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.CREATEDIRECTORIESPERMISSION;
 import static ch.cyberduck.core.ctera.CteraAttributesFinderFeature.WRITEPERMISSION;
@@ -38,28 +39,28 @@ public class CteraTouchFeatureTest extends AbstractCteraTest {
     public void testPreflightFileMissingCustomProps() throws Exception {
         final Path file = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         file.setAttributes(file.attributes().setAcl(Acl.EMPTY));
-        new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random());
+        new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random()));
     }
 
     @Test
     public void testPreflightReadPermission() throws Exception {
         final Path file = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         file.setAttributes(file.attributes().setAcl(new Acl(new Acl.CanonicalUser(), CteraAttributesFinderFeature.READPERMISSION)));
-        assertThrows(AccessDeniedException.class, () -> new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
     public void testPreflightNoPermissions() throws Exception {
         final Path file = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         file.setAttributes(file.attributes().setAcl(new Acl(new Acl.CanonicalUser())));
-        assertThrows(AccessDeniedException.class, () -> new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
     public void testPreflightWritePermission() throws Exception {
         final Path file = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         file.setAttributes(file.attributes().setAcl(new Acl(new Acl.CanonicalUser(), CteraAttributesFinderFeature.WRITEPERMISSION)));
-        new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random());
+        new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
     }
 
@@ -67,7 +68,7 @@ public class CteraTouchFeatureTest extends AbstractCteraTest {
     public void testPreflightCreateDirectoriesPermission() throws Exception {
         final Path file = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
         file.setAttributes(file.attributes().setAcl(new Acl(new Acl.CanonicalUser(), CteraAttributesFinderFeature.CREATEDIRECTORIESPERMISSION)));
-        new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random());
+        new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
     }
 
@@ -79,14 +80,14 @@ public class CteraTouchFeatureTest extends AbstractCteraTest {
                         new Acl.UserAndRole(new Acl.CanonicalUser(), WRITEPERMISSION),
                         new Acl.UserAndRole(new Acl.CanonicalUser(), CREATEDIRECTORIESPERMISSION)
                 )));
-        new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random());
+        new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
     }
 
     @Test
     public void testPreflightFileAccessGrantedCustomProps() throws Exception {
         final Path file = new Path(new DefaultHomeFinderService(session).find(), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        new CteraTouchFeature(session).preflight(file, new AlphanumericRandomStringService().random());
+        new CteraTouchFeature(session).preflight(file, Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
     }
 }

deepbox/src/main/java/ch/cyberduck/core/deepbox/DeepboxDirectoryFeature.java

@@ -34,6 +34,7 @@ import org.apache.logging.log4j.Logger;
 
 import java.util.Collections;
 import java.util.List;
+import java.util.Optional;
 
 public class DeepboxDirectoryFeature implements Directory<Node> {
     private static final Logger log = LogManager.getLogger(DeepboxDirectoryFeature.class);
@@ -89,7 +90,7 @@ public class DeepboxDirectoryFeature implements Directory<Node> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(containerService.isInbox(workdir)) {
             throw new AccessDeniedException(LocaleFactory.localizedString("Adding folders is not permitted in the inbox", "Deepbox")).withFile(workdir);
         }

deepbox/src/main/java/ch/cyberduck/core/deepbox/DeepboxTouchFeature.java

@@ -26,6 +26,8 @@ import ch.cyberduck.core.shared.DefaultTouchFeature;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
+import java.util.Optional;
+
 import static ch.cyberduck.core.deepbox.DeepboxAttributesFinderFeature.CANADDCHILDREN;
 
 public class DeepboxTouchFeature extends DefaultTouchFeature<Node> {
@@ -39,7 +41,7 @@ public class DeepboxTouchFeature extends DefaultTouchFeature<Node> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             throw new AccessDeniedException(LocaleFactory.localizedString("Adding files is not permitted at the organisation level", "Deepbox")).withFile(workdir);
         }

deepbox/src/test/java/ch/cyberduck/core/deepbox/DeepboxDirectoryFeatureTest.java

@@ -33,6 +33,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -45,7 +46,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path("/", EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(NotfoundException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -55,7 +56,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path("/ORG 4 - DeepBox Desktop App/", EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(NotfoundException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -65,7 +66,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path(String.format("/ORG 1 - DeepBox Desktop App/%s", DeepboxListService.SHARED), EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(NotfoundException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -75,7 +76,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1", EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(AccessDeniedException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -85,7 +86,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path(String.format("/ORG 1 - DeepBox Desktop App/%s/Demo 1 (1 Christian Gruber)", DeepboxListService.SHARED), EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(AccessDeniedException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -95,7 +96,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1/Inbox", EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(InteroperabilityException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -105,7 +106,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path(String.format("/ORG 1 - DeepBox Desktop App/%s/Demo 1 (1 Christian Gruber)/Inbox", DeepboxListService.SHARED), EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(InteroperabilityException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -115,7 +116,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxDirectoryFeature directory = new DeepboxDirectoryFeature(session, nodeid);
         final Path parent = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1/Trash", EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> directory.preflight(parent, Optional.of(folder.getName())));
         assertThrows(AccessDeniedException.class, () -> directory.mkdir(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -150,7 +151,7 @@ public class DeepboxDirectoryFeatureTest extends AbstractDeepboxTest {
         final DeepboxIdProvider nodeid = new DeepboxIdProvider(session);
         final Path documents = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1/Documents/", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final Path test = new DeepboxDirectoryFeature(session, nodeid).mkdir(new DeepboxWriteFeature(session, nodeid), new Path(documents, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory)), new TransferStatus());
-        new DeepboxDirectoryFeature(session, nodeid).preflight(documents.withAttributes(new DeepboxAttributesFinderFeature(session, nodeid).find(documents)), test.getName());
+        new DeepboxDirectoryFeature(session, nodeid).preflight(documents.withAttributes(new DeepboxAttributesFinderFeature(session, nodeid).find(documents)), Optional.of(test.getName()));
         assertTrue(new DeepboxFindFeature(session, nodeid).find(test));
         new DeepboxDeleteFeature(session, nodeid).delete(Collections.singletonList(test), LoginCallback.noop, new Delete.DisabledCallback());
     }

deepbox/src/test/java/ch/cyberduck/core/deepbox/DeepboxTouchFeatureTest.java

@@ -34,6 +34,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static ch.cyberduck.core.deepbox.DeepboxAttributesFinderFeature.CANADDCHILDREN;
 import static org.junit.Assert.*;
@@ -44,7 +45,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
     @Test
     public void testTouchRoot() throws Exception {
         final DeepboxIdProvider fileid = new DeepboxIdProvider(session);
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, fileid).preflight(Home.root(), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, fileid).preflight(Home.root(), Optional.of(new AlphanumericRandomStringService().random())));
         assertThrows(NotfoundException.class, () -> new DeepboxTouchFeature(session, fileid).touch(new DeepboxWriteFeature(session, fileid), new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.file)), new TransferStatus()));
     }
 
@@ -53,7 +54,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final DeepboxIdProvider fileid = new DeepboxIdProvider(session);
         final Path documents = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1/Documents/", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final Path test = new DeepboxTouchFeature(session, fileid).touch(new DeepboxWriteFeature(session, fileid), new Path(documents, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.file)), new TransferStatus());
-        new DeepboxTouchFeature(session, fileid).preflight(documents.withAttributes(new DeepboxAttributesFinderFeature(session, fileid).find(documents)), test.getName());
+        new DeepboxTouchFeature(session, fileid).preflight(documents.withAttributes(new DeepboxAttributesFinderFeature(session, fileid).find(documents)), Optional.of(test.getName()));
         assertTrue(new DeepboxFindFeature(session, fileid).find(test));
         new DeepboxDeleteFeature(session, fileid).delete(Collections.singletonList(test), LoginCallback.noop, new Delete.DisabledCallback());
     }
@@ -73,7 +74,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final Path folder = new Path("/ORG 4 - DeepBox Desktop App/", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertEquals(Acl.EMPTY, attributes.getAcl());
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -82,7 +83,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final Path folder = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertEquals(Acl.EMPTY, attributes.getAcl());
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -91,7 +92,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final Path folder = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertEquals(Acl.EMPTY, attributes.getAcl());
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -102,9 +103,9 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         assertTrue(new BoxRestControllerApi(session.getClient()).getBox(ORG4_DEEPBOX4, ORG4_DEEPBOX4_BOX1).getBoxPolicy().isCanAddQueue());
         assertTrue(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
         // assert no fail
-        new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random());
+        new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random()));
         // DeepBox inbox is flat
-        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -114,8 +115,8 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertFalse(new BoxRestControllerApi(session.getClient()).getBox(ORG1_DEEPBOX1, ORG1_DEEPBOX1_BOX1).getBoxPolicy().isCanAddQueue());
         assertFalse(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -126,9 +127,9 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         assertTrue(new BoxRestControllerApi(session.getClient()).getBox(ORG4_DEEPBOX4, ORG4_DEEPBOX4_BOX1).getBoxPolicy().isCanAddFilesRoot());
         assertTrue(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
         // assert no fail
-        new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random());
+        new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
-        new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random());
+        new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random()));
     }
 
     @Test
@@ -138,8 +139,8 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertFalse(new BoxRestControllerApi(session.getClient()).getBox(ORG1_DEEPBOX1, ORG1_DEEPBOX1_BOX1).getBoxPolicy().isCanAddFilesRoot());
         assertFalse(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -148,8 +149,8 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final Path folder = new Path("/ORG 1 - DeepBox Desktop App/ORG 1 - DeepBox Desktop App/ORG1:Box1/Trash/", EnumSet.of(Path.Type.directory, Path.Type.volume));
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertFalse(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -160,9 +161,9 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         assertTrue(new CoreRestControllerApi(session.getClient()).getNodeInfo(attributes.getFileId(), null, null, null).getNode().getPolicy().isCanAddChildren());
         assertTrue(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
         // assert no fail
-        new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random());
+        new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random()));
         // assert no fail
-        new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random());
+        new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random()));
     }
 
     @Test
@@ -172,8 +173,8 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertFalse(new CoreRestControllerApi(session.getClient()).getNodeInfo(attributes.getFileId(), null, null, null).getNode().getPolicy().isCanAddChildren());
         assertFalse(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -183,8 +184,8 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final PathAttributes attributes = new DeepboxAttributesFinderFeature(session, nodeid).find(folder);
         assertFalse(new CoreRestControllerApi(session.getClient()).getNodeInfo(attributes.getFileId(), null, null, null).getNode().getPolicy().isCanAddChildren());
         assertFalse(attributes.getAcl().get(new Acl.CanonicalUser()).contains(CANADDCHILDREN));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), new AlphanumericRandomStringService().random()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxDirectoryFeature(session, nodeid).preflight(folder.withAttributes(attributes), Optional.of(new AlphanumericRandomStringService().random())));
     }
 
     @Test
@@ -192,7 +193,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final DeepboxIdProvider nodeid = new DeepboxIdProvider(session);
         final Path parent = new Path("/ORG 4 - DeepBox Desktop App/ORG 4 - DeepBox Desktop App/ORG3:Box1/Trash", EnumSet.of(Path.Type.directory));
         final Path folder = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(parent, folder.getName()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(parent, Optional.of(folder.getName())));
         assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).touch(new DeepboxWriteFeature(session, nodeid), folder, new TransferStatus()));
     }
 
@@ -201,7 +202,7 @@ public class DeepboxTouchFeatureTest extends AbstractDeepboxTest {
         final DeepboxIdProvider nodeid = new DeepboxIdProvider(session);
         final Path parent = new Path(String.format("/ORG 1 - DeepBox Desktop App/%s", DeepboxListService.SHARED), EnumSet.of(Path.Type.directory));
         final Path file = new Path(parent, new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory));
-        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(parent, file.getName()));
+        assertThrows(AccessDeniedException.class, () -> new DeepboxTouchFeature(session, nodeid).preflight(parent, Optional.of(file.getName())));
         assertThrows(NotfoundException.class, () -> new DeepboxTouchFeature(session, nodeid).touch(new DeepboxWriteFeature(session, nodeid), file, new TransferStatus()));
     }
 }

dracoon/src/main/java/ch/cyberduck/core/sds/SDSDelegatingWriteFeature.java

@@ -31,6 +31,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.util.EnumSet;
+import java.util.Optional;
 
 public class SDSDelegatingWriteFeature implements MultipartWrite<Node> {
     private static final Logger log = LogManager.getLogger(SDSDelegatingWriteFeature.class);
@@ -68,7 +69,7 @@ public class SDSDelegatingWriteFeature implements MultipartWrite<Node> {
 
     @Override
     public void preflight(final Path file) throws BackgroundException {
-        new SDSTouchFeature(session, nodeid).preflight(file.getParent(), file.getName());
+        new SDSTouchFeature(session, nodeid).preflight(file.getParent(), Optional.of(file.getName()));
     }
 
     @Override

dracoon/src/main/java/ch/cyberduck/core/sds/SDSDirectoryFeature.java

@@ -32,12 +32,12 @@ import ch.cyberduck.core.sds.io.swagger.client.model.EncryptRoomRequest;
 import ch.cyberduck.core.sds.io.swagger.client.model.Node;
 import ch.cyberduck.core.transfer.TransferStatus;
 
-import org.apache.commons.lang3.StringUtils;
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.text.MessageFormat;
 import java.util.EnumSet;
+import java.util.Optional;
 
 public class SDSDirectoryFeature implements Directory<Node> {
     private static final Logger log = LogManager.getLogger(SDSDirectoryFeature.class);
@@ -102,15 +102,17 @@ public class SDSDirectoryFeature implements Directory<Node> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             if(!HostPreferencesFactory.get(session.getHost()).getBoolean("sds.create.dataroom.enable")) {
                 log.warn("Disallow creating new top level data room {}", filename);
                 throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename)).withFile(workdir);
             }
         }
-        if(!SDSTouchFeature.validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            if(!SDSTouchFeature.validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            }
         }
         final SDSPermissionsFeature permissions = new SDSPermissionsFeature(session, nodeid);
         if(!permissions.containsRole(workdir, SDSPermissionsFeature.CREATE_ROLE)) {

dracoon/src/main/java/ch/cyberduck/core/sds/SDSTouchFeature.java

@@ -33,6 +33,7 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class SDSTouchFeature extends DefaultTouchFeature<Node> {
     private static final Logger log = LogManager.getLogger(SDSTouchFeature.class);
@@ -59,12 +60,14 @@ public class SDSTouchFeature extends DefaultTouchFeature<Node> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);
         }
-        if(!validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
         final SDSPermissionsFeature permissions = new SDSPermissionsFeature(session, nodeid);
         if(!permissions.containsRole(workdir, SDSPermissionsFeature.CREATE_ROLE)

dracoon/src/test/java/ch/cyberduck/core/sds/SDSTouchFeatureTest.java

@@ -35,7 +35,6 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import ch.cyberduck.test.IntegrationTest;
 
 import org.apache.commons.lang3.RandomUtils;
-import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
@@ -44,6 +43,7 @@ import java.time.Duration;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -53,9 +53,9 @@ public class SDSTouchFeatureTest extends AbstractSDSTest {
     @Test
     public void testSupported() {
         final SDSNodeIdProvider nodeid = new SDSNodeIdProvider(session);
-        assertTrue(new SDSTouchFeature(session, nodeid).isSupported(new Path(new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory)), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.file)), StringUtils.EMPTY));
+        assertTrue(new SDSTouchFeature(session, nodeid).isSupported(new Path(new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory)), new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.file)), Optional.empty()));
-        assertTrue(new SDSTouchFeature(session, nodeid).isSupported(new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory)), StringUtils.EMPTY));
+        assertTrue(new SDSTouchFeature(session, nodeid).isSupported(new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory)), Optional.empty()));
-        assertFalse(new SDSTouchFeature(session, nodeid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), StringUtils.EMPTY));
+        assertFalse(new SDSTouchFeature(session, nodeid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), Optional.empty()));
     }
 
     @Test(expected = BackgroundException.class)
@@ -77,8 +77,8 @@ public class SDSTouchFeatureTest extends AbstractSDSTest {
                 new SDSDirectS3MultipartWriteFeature(session, nodeid), new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory, Path.Type.volume)), new TransferStatus());
         try {
             final SDSTouchFeature feature = new SDSTouchFeature(session, nodeid);
-            assertFalse(feature.isSupported(room, "?"));
+            assertFalse(feature.isSupported(room, Optional.of("?")));
-            assertThrows(InvalidFilenameException.class, () -> feature.preflight(room, "?"));
+            assertThrows(InvalidFilenameException.class, () -> feature.preflight(room, Optional.of("?")));
             feature.touch(new SDSDirectS3MultipartWriteFeature(session, nodeid), new Path(room, "CON", EnumSet.of(Path.Type.file)), new TransferStatus());
         }
         catch(InteroperabilityException e) {
@@ -97,8 +97,8 @@ public class SDSTouchFeatureTest extends AbstractSDSTest {
                 new SDSDirectS3MultipartWriteFeature(session, nodeid), new Path(new AlphanumericRandomStringService().random(), EnumSet.of(Path.Type.directory, Path.Type.volume)), new TransferStatus());
         try {
             final SDSTouchFeature feature = new SDSTouchFeature(session, nodeid);
-            assertFalse(feature.isSupported(room, "?"));
+            assertFalse(feature.isSupported(room, Optional.of("?")));
-            assertThrows(InvalidFilenameException.class, () -> feature.preflight(room, "?"));
+            assertThrows(InvalidFilenameException.class, () -> feature.preflight(room, Optional.of("?")));
             feature.touch(new SDSDirectS3MultipartWriteFeature(session, nodeid), new Path(room, "?", EnumSet.of(Path.Type.file)), new TransferStatus());
         }
         catch(InteroperabilityException e) {
@@ -132,7 +132,7 @@ public class SDSTouchFeatureTest extends AbstractSDSTest {
         final long quota = 1L + PreferencesFactory.get().getInteger("sds.upload.multipart.chunksize");
         updateRoomRequest.setQuota(quota);
         assertEquals(quota, new NodesApi(session.getClient()).updateRoom(updateRoomRequest, Long.valueOf(room.attributes().getVersionId()), null).getQuota(), 0L);
-        assertTrue(new SDSTouchFeature(session, nodeid).isSupported(room.withAttributes(new SDSAttributesFinderFeature(session, nodeid).find(room)), StringUtils.EMPTY));
+        assertTrue(new SDSTouchFeature(session, nodeid).isSupported(room.withAttributes(new SDSAttributesFinderFeature(session, nodeid).find(room)), Optional.empty()));
         assertEquals(quota, room.attributes().getQuota().available, 0L);
         final byte[] content = RandomUtils.nextBytes(2);
         final TransferStatus status = new TransferStatus();
@@ -150,7 +150,7 @@ public class SDSTouchFeatureTest extends AbstractSDSTest {
             }
         }
         while(attr.getSize() != 2L);
-        assertFalse(new SDSTouchFeature(session, nodeid).isSupported(room.withAttributes(attr), StringUtils.EMPTY));
+        assertFalse(new SDSTouchFeature(session, nodeid).isSupported(room.withAttributes(attr), Optional.empty()));
         assertEquals(quota, attr.getQuota().available, 0L);
         assertEquals(2L, attr.getSize());
         new SDSDeleteFeature(session, nodeid).delete(Arrays.asList(test, room), LoginCallback.noop, new Delete.DisabledCallback());

dropbox/src/main/java/ch/cyberduck/core/dropbox/DropboxDirectoryFeature.java

@@ -25,6 +25,7 @@ import ch.cyberduck.core.features.Write;
 import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import com.dropbox.core.DbxException;
 import com.dropbox.core.v2.files.CreateFolderResult;
@@ -54,9 +55,11 @@ public class DropboxDirectoryFeature implements Directory<Metadata> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!DropboxTouchFeature.validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            if(!DropboxTouchFeature.validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            }
         }
     }
 }

dropbox/src/main/java/ch/cyberduck/core/dropbox/DropboxTouchFeature.java

@@ -24,6 +24,7 @@ import ch.cyberduck.core.shared.DefaultTouchFeature;
 import org.apache.commons.lang3.StringUtils;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import com.dropbox.core.v2.files.Metadata;
 
@@ -42,9 +43,11 @@ public class DropboxTouchFeature extends DefaultTouchFeature<Metadata> {
      * @throws InvalidFilenameException If restricted filename
      */
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
     }
 

dropbox/src/test/java/ch/cyberduck/core/dropbox/DropboxTouchFeatureTest.java

@@ -41,6 +41,7 @@ import org.junit.experimental.categories.Category;
 import java.io.ByteArrayInputStream;
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -51,7 +52,7 @@ public class DropboxTouchFeatureTest extends AbstractDropboxTest {
     public void testDisallowedName() throws Exception {
         final DropboxTouchFeature touch = new DropboxTouchFeature(session);
         final Path file = new Path(new DefaultHomeFinderService(session).find(), String.format("~%s.tmp", new AlphanumericRandomStringService().random()), EnumSet.of(Path.Type.file));
-        assertFalse(touch.isSupported(new DefaultHomeFinderService(session).find(), file.getName()));
+        assertFalse(touch.isSupported(new DefaultHomeFinderService(session).find(), Optional.of(file.getName())));
         touch.touch(new DropboxWriteFeature(session), file, new TransferStatus());
     }
 

eue/src/main/java/ch/cyberduck/core/eue/EueDirectoryFeature.java

@@ -38,6 +38,7 @@ import org.apache.logging.log4j.Logger;
 
 import java.text.MessageFormat;
 import java.util.Collections;
+import java.util.Optional;
 
 public class EueDirectoryFeature implements Directory<EueWriteFeature.Chunk> {
     private static final Logger log = LogManager.getLogger(EueDirectoryFeature.class);
@@ -89,9 +90,11 @@ public class EueDirectoryFeature implements Directory<EueWriteFeature.Chunk> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!EueTouchFeature.validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            if(!EueTouchFeature.validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
+            }
         }
     }
 }

eue/src/main/java/ch/cyberduck/core/eue/EueTouchFeature.java

@@ -24,6 +24,7 @@ import ch.cyberduck.core.shared.DefaultTouchFeature;
 import org.apache.commons.lang3.StringUtils;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class EueTouchFeature extends DefaultTouchFeature<EueWriteFeature.Chunk> {
 
@@ -32,9 +33,11 @@ public class EueTouchFeature extends DefaultTouchFeature<EueWriteFeature.Chunk>
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
-        if(!validate(filename)) {
+        if(filename.isPresent()) {
-            throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            if(!validate(filename.get())) {
+                throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename));
+            }
         }
     }
 

eue/src/test/java/ch/cyberduck/core/eue/EueTouchFeatureTest.java

@@ -30,6 +30,7 @@ import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertThrows;
@@ -40,12 +41,12 @@ public class EueTouchFeatureTest extends AbstractEueSessionTest {
     @Test
     public void testSupported() {
         final EueResourceIdProvider fileid = new EueResourceIdProvider(session);
-        assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), "f >f"));
+        assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), Optional.of("f >f")));
-        assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), "f "));
+        assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), Optional.of("f ")));
-        assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), "f."));
+        assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)), Optional.of("f.")));
         // max path length exceeded. Allowed are 250, but the length was 255
         assertFalse(new EueTouchFeature(session, fileid).isSupported(new Path("/", EnumSet.of(Path.Type.directory)),
-                new AsciiRandomStringService(255).random()));
+                Optional.of(new AsciiRandomStringService(255).random())));
     }
 
     @Test

ftp/src/main/java/ch/cyberduck/core/ftp/FTPDirectoryFeature.java

@@ -27,6 +27,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import org.apache.commons.net.ftp.FTPReply;
 
 import java.io.IOException;
+import java.util.Optional;
 
 public class FTPDirectoryFeature implements Directory<Void> {
 
@@ -57,7 +58,7 @@ public class FTPDirectoryFeature implements Directory<Void> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) {
+    public void preflight(final Path workdir, final Optional<String> filename) {
         // Skip checking permission mask
     }
 }

ftp/src/main/java/ch/cyberduck/core/ftp/FTPTouchFeature.java

@@ -18,6 +18,8 @@ package ch.cyberduck.core.ftp;
 import ch.cyberduck.core.Path;
 import ch.cyberduck.core.shared.DefaultTouchFeature;
 
+import java.util.Optional;
+
 public class FTPTouchFeature extends DefaultTouchFeature<Void> {
 
     public FTPTouchFeature(final FTPSession session) {
@@ -25,7 +27,7 @@ public class FTPTouchFeature extends DefaultTouchFeature<Void> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) {
+    public void preflight(final Path workdir, final Optional<String> filename) {
         // Skip checking permission mask
     }
 }

googledrive/src/main/java/ch/cyberduck/core/googledrive/DriveDirectoryFeature.java

@@ -17,7 +17,6 @@ package ch.cyberduck.core.googledrive;
 
 import ch.cyberduck.core.DefaultPathAttributes;
 import ch.cyberduck.core.Path;
-import ch.cyberduck.core.PathAttributes;
 import ch.cyberduck.core.SimplePathPredicate;
 import ch.cyberduck.core.UUIDRandomStringService;
 import ch.cyberduck.core.exception.BackgroundException;
@@ -30,6 +29,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.io.IOException;
 import java.util.Collections;
+import java.util.Optional;
 
 import com.google.api.services.drive.Drive;
 import com.google.api.services.drive.model.File;
@@ -81,7 +81,7 @@ public class DriveDirectoryFeature implements Directory<File> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         new DriveTouchFeature(session, fileid).preflight(workdir, filename);
     }
 }

googledrive/src/main/java/ch/cyberduck/core/googledrive/DriveTouchFeature.java

@@ -30,6 +30,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 import java.io.IOException;
 import java.text.MessageFormat;
 import java.util.Collections;
+import java.util.Optional;
 
 import com.google.api.services.drive.Drive;
 import com.google.api.services.drive.model.File;
@@ -71,7 +72,7 @@ public class DriveTouchFeature implements Touch<File> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);
         }

googlestorage/src/main/java/ch/cyberduck/core/googlestorage/GoogleStorageDirectoryFeature.java

@@ -32,6 +32,7 @@ import org.jets3t.service.utils.ServiceUtils;
 import java.io.IOException;
 import java.text.MessageFormat;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import com.google.api.services.storage.Storage;
 import com.google.api.services.storage.model.Bucket;
@@ -77,20 +78,19 @@ public class GoogleStorageDirectoryFeature implements Directory<StorageObject> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
-            if(StringUtils.isNotBlank(filename)) {
+            if(filename.isPresent()) {
-                if(StringUtils.startsWith(filename, "goog")) {
+                if(StringUtils.startsWith(filename.get(), "goog")) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
-                if(StringUtils.contains(filename, "google")) {
+                if(StringUtils.contains(filename.get(), "google")) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
-                if(!ServiceUtils.isBucketNameValidDNSName(filename)) {
+                if(!ServiceUtils.isBucketNameValidDNSName(filename.get())) {
                     throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                 }
             }
         }
     }
-
 }

googlestorage/src/main/java/ch/cyberduck/core/googlestorage/GoogleStorageTouchFeature.java

@@ -22,6 +22,7 @@ import ch.cyberduck.core.exception.BackgroundException;
 import ch.cyberduck.core.shared.DefaultTouchFeature;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import com.google.api.services.storage.model.StorageObject;
 
@@ -32,7 +33,7 @@ public class GoogleStorageTouchFeature extends DefaultTouchFeature<StorageObject
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         // Creating files is only possible inside a bucket.
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);

irods/src/main/java/ch/cyberduck/core/irods/IRODSTouchFeature.java

@@ -22,8 +22,6 @@ import ch.cyberduck.core.features.Touch;
 import ch.cyberduck.core.features.Write;
 import ch.cyberduck.core.transfer.TransferStatus;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
-
 import org.irods.irods4j.high_level.connection.IRODSConnection;
 import org.irods.irods4j.low_level.api.IRODSApi;
 import org.irods.irods4j.low_level.api.IRODSException;
@@ -32,6 +30,8 @@ import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 
+import com.fasterxml.jackson.databind.ObjectMapper;
+
 public class IRODSTouchFeature implements Touch {
 
     private static final ObjectMapper mapper = new ObjectMapper();
@@ -66,9 +66,4 @@ public class IRODSTouchFeature implements Touch {
             throw new DefaultIOExceptionMappingService().map("Cannot create {0}", e, file);
         }
     }
-
-    @Override
-    public boolean isSupported(final Path workdir, final String filename) {
-        return true;
-    }
 }

manta/src/main/java/ch/cyberduck/core/manta/MantaDirectoryFeature.java

@@ -26,11 +26,12 @@ import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.io.IOException;
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import com.joyent.manta.exception.MantaClientHttpResponseException;
 import com.joyent.manta.exception.MantaException;
 
-public class MantaDirectoryFeature implements Directory {
+public class MantaDirectoryFeature implements Directory<Void> {
 
     private final MantaSession session;
 
@@ -39,7 +40,7 @@ public class MantaDirectoryFeature implements Directory {
     }
 
     @Override
-    public Path mkdir(final Write writer, final Path folder, final TransferStatus status) throws BackgroundException {
+    public Path mkdir(final Write<Void> writer, final Path folder, final TransferStatus status) throws BackgroundException {
         try {
             session.getClient().putDirectory(folder.getAbsolute());
             return folder;
@@ -56,7 +57,7 @@ public class MantaDirectoryFeature implements Directory {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(!session.isUserWritable(workdir)) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename)).withFile(workdir);
         }

manta/src/main/java/ch/cyberduck/core/manta/MantaTouchFeature.java

@@ -26,6 +26,7 @@ import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.io.IOException;
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import com.joyent.manta.client.MantaObjectResponse;
 import com.joyent.manta.exception.MantaClientHttpResponseException;
@@ -60,7 +61,7 @@ public class MantaTouchFeature implements Touch<Void> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(!session.isUserWritable(workdir)) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);
         }

onedrive/src/main/java/ch/cyberduck/core/onedrive/features/GraphDirectoryFeature.java

@@ -34,6 +34,7 @@ import org.nuxeo.onedrive.client.types.DriveItem;
 
 import java.io.IOException;
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class GraphDirectoryFeature implements Directory<DriveItem.Metadata> {
 
@@ -68,7 +69,7 @@ public class GraphDirectoryFeature implements Directory<DriveItem.Metadata> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(!session.isAccessible(workdir)) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename)).withFile(workdir);
         }

onedrive/src/main/java/ch/cyberduck/core/onedrive/features/GraphTouchFeature.java

@@ -37,6 +37,7 @@ import org.nuxeo.onedrive.client.types.DriveItem;
 
 import java.io.IOException;
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class GraphTouchFeature implements Touch<DriveItem.Metadata> {
 
@@ -70,7 +71,7 @@ public class GraphTouchFeature implements Touch<DriveItem.Metadata> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(!session.isAccessible(workdir)) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);
         }

onedrive/src/test/java/ch/cyberduck/core/onedrive/OfflineGraphDirectoryTouchFeatureTest.java

@@ -32,6 +32,7 @@ import java.util.Arrays;
 import java.util.Collection;
 import java.util.EnumSet;
 import java.util.List;
+import java.util.Optional;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.fail;
@@ -107,11 +108,11 @@ public class OfflineGraphDirectoryTouchFeatureTest {
 
             if(feature instanceof Touch) {
                 final Touch touch = (Touch) feature;
-                assertEquals(String.format("Create \"%s\" in \"%s\".", name, parent.getAbsolute()), testCase.isValid, touch.isSupported(parent, name));
+                assertEquals(String.format("Create \"%s\" in \"%s\".", name, parent.getAbsolute()), testCase.isValid, touch.isSupported(parent, Optional.of(name)));
             }
             else if(feature instanceof Directory) {
                 final Directory directory = (Directory) feature;
-                assertEquals(String.format("Create \"%s\" in \"%s\".", name, parent.getAbsolute()), testCase.isValid, directory.isSupported(parent, name));
+                assertEquals(String.format("Create \"%s\" in \"%s\".", name, parent.getAbsolute()), testCase.isValid, directory.isSupported(parent, Optional.of(name)));
             }
             else {
                 fail();

openstack/src/main/java/ch/cyberduck/core/openstack/SwiftTouchFeature.java

@@ -25,6 +25,7 @@ import ch.cyberduck.core.exception.BackgroundException;
 import ch.cyberduck.core.shared.DefaultTouchFeature;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 import ch.iterate.openstack.swift.model.StorageObject;
 
@@ -35,7 +36,7 @@ public class SwiftTouchFeature extends DefaultTouchFeature<StorageObject> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         // Creating files is only possible inside a container.
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);

openstack/src/test/java/ch/cyberduck/core/openstack/SwiftTouchFeatureTest.java

@@ -8,11 +8,11 @@ import ch.cyberduck.core.SimplePathPredicate;
 import ch.cyberduck.core.transfer.TransferStatus;
 import ch.cyberduck.test.IntegrationTest;
 
-import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -21,8 +21,8 @@ public class SwiftTouchFeatureTest extends AbstractSwiftTest {
 
     @Test
     public void testSupported() {
-        assertFalse(new SwiftTouchFeature(session, new SwiftRegionService(session)).isSupported(new Path("/", EnumSet.of(Path.Type.directory, Path.Type.volume)), StringUtils.EMPTY));
+        assertFalse(new SwiftTouchFeature(session, new SwiftRegionService(session)).isSupported(new Path("/", EnumSet.of(Path.Type.directory, Path.Type.volume)), Optional.empty()));
-        assertTrue(new SwiftTouchFeature(session, new SwiftRegionService(session)).isSupported(new Path("/container", EnumSet.of(Path.Type.directory, Path.Type.volume)), StringUtils.EMPTY));
+        assertTrue(new SwiftTouchFeature(session, new SwiftRegionService(session)).isSupported(new Path("/container", EnumSet.of(Path.Type.directory, Path.Type.volume)), Optional.empty()));
     }
 
     @Test

osx/src/main/java/ch/cyberduck/ui/cocoa/controller/BrowserController.java

@@ -2727,8 +2727,7 @@ public class BrowserController extends WindowController implements NSToolbar.Del
         uploadPanel = NSOpenPanel.openPanel();
         uploadPanel.setCanChooseDirectories(true);
         uploadPanel.setCanChooseFiles(pool.getFeature(Touch.class).isSupported(
-                new UploadTargetFinder(workdir).find(this.getSelectedPath()),
+                new UploadTargetFinder(workdir).find(this.getSelectedPath()), Optional.empty()));
-                StringUtils.EMPTY));
         uploadPanel.setCanCreateDirectories(false);
         uploadPanel.setTreatsFilePackagesAsDirectories(true);
         uploadPanel.setAllowsMultipleSelection(true);

osx/src/main/java/ch/cyberduck/ui/cocoa/datasource/BrowserTableDataSource.java

@@ -470,7 +470,7 @@ public abstract class BrowserTableDataSource extends ProxyController implements
                 return NSDraggingInfo.NSDragOperationNone;
             }
             final Touch feature = controller.getSession().getFeature(Touch.class);
-            if(!feature.isSupported(destination, StringUtils.EMPTY)) {
+            if(!feature.isSupported(destination, Optional.empty())) {
                 // Target file system does not support creating files. Creating files is not supported
                 // for example in root of cloud storage accounts.
                 return NSDraggingInfo.NSDragOperationNone;

osx/src/main/java/ch/cyberduck/ui/cocoa/toolbar/BrowserToolbarValidator.java

@@ -45,7 +45,6 @@ import ch.cyberduck.core.vault.VaultRegistry;
 import ch.cyberduck.ui.browser.UploadTargetFinder;
 import ch.cyberduck.ui.cocoa.controller.BrowserController;
 
-import org.apache.commons.lang3.StringUtils;
 import org.rococoa.Foundation;
 import org.rococoa.Rococoa;
 import org.rococoa.Selector;
@@ -236,25 +235,25 @@ public class BrowserToolbarValidator implements ToolbarValidator {
         else if(action.equals(newfolder.action())) {
             return this.isBrowser() && controller.isMounted() &&
                     controller.getSession().getFeature(Directory.class).isSupported(
-                            new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()), StringUtils.EMPTY
+                            new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()), Optional.empty()
                     );
         }
         else if(action.equals(Foundation.selector("createEncryptedVaultButtonClicked:"))) {
             return this.isBrowser() && controller.isMounted() && controller.getSession().getVaultRegistry() != VaultRegistry.DISABLED &&
                     !controller.getSession().getVaultRegistry().contains(controller.workdir()) &&
                     controller.getSession().getFeature(Directory.class).isSupported(
-                            new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()), StringUtils.EMPTY
+                            new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()), Optional.empty()
                     );
         }
         else if(action.equals(Foundation.selector("createFileButtonClicked:"))) {
             return this.isBrowser() && controller.isMounted() && controller.getSession().getFeature(Touch.class).isSupported(
-                    new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()), StringUtils.EMPTY
+                    new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()), Optional.empty()
             );
         }
         else if(action.equals(upload.action())) {
             return this.isBrowser() && controller.isMounted() && controller.getSession().getFeature(Touch.class).isSupported(
                     new UploadTargetFinder(controller.workdir()).find(controller.getSelectedPath()),
-                    StringUtils.EMPTY);
+                    Optional.empty());
         }
         else if(action.equals(Foundation.selector("createSymlinkButtonClicked:"))) {
             return this.isBrowser() && controller.isMounted() && controller.getSession().getFeature(Symlink.class) != null

s3/src/main/java/ch/cyberduck/core/s3/S3DirectoryFeature.java

@@ -33,6 +33,7 @@ import org.jets3t.service.utils.ServiceUtils;
 
 import java.text.MessageFormat;
 import java.util.EnumSet;
+import java.util.Optional;
 
 public class S3DirectoryFeature implements Directory<StorageObject> {
 
@@ -69,11 +70,11 @@ public class S3DirectoryFeature implements Directory<StorageObject> {
 
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(StringUtils.isEmpty(RequestEntityRestStorageService.findBucketInHostname(session.getHost()))) {
             if(workdir.isRoot()) {
-                if(StringUtils.isNotBlank(filename)) {
+                if(filename.isPresent()) {
-                    if(!ServiceUtils.isBucketNameValidDNSName(filename)) {
+                    if(!ServiceUtils.isBucketNameValidDNSName(filename.get())) {
                         throw new InvalidFilenameException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename));
                     }
                 }

s3/src/main/java/ch/cyberduck/core/s3/S3TouchFeature.java

@@ -31,6 +31,7 @@ import org.apache.commons.lang3.StringUtils;
 import org.jets3t.service.model.StorageObject;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class S3TouchFeature extends DefaultTouchFeature<StorageObject> {
 
@@ -47,7 +48,7 @@ public class S3TouchFeature extends DefaultTouchFeature<StorageObject> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(StringUtils.isEmpty(RequestEntityRestStorageService.findBucketInHostname(session.getHost()))) {
             // Creating files is only possible inside a bucket.
             if(workdir.isRoot()) {

s3/src/test/java/ch/cyberduck/core/s3/S3DirectoryFeatureTest.java

@@ -39,6 +39,7 @@ import java.util.Arrays;
 import java.util.Collections;
 import java.util.EnumSet;
 import java.util.HashSet;
+import java.util.Optional;
 import java.util.concurrent.atomic.AtomicBoolean;
 
 import static org.junit.Assert.*;
@@ -59,7 +60,7 @@ public class S3DirectoryFeatureTest extends AbstractS3Test {
                     break;
                 default:
                     final Path test = new Path(new DefaultHomeFinderService(session).find(), new AsciiRandomStringService(30).random(), EnumSet.of(Path.Type.directory, Path.Type.volume));
-                    assertTrue(feature.isSupported(test.getParent(), test.getName()));
+                    assertTrue(feature.isSupported(test.getParent(), Optional.of(test.getName())));
                     test.attributes().setRegion(region.getIdentifier());
                     feature.mkdir(new S3WriteFeature(session, new S3AccessControlListFeature(session)), test, new TransferStatus().setRegion(region.getIdentifier()));
                     assertTrue(new S3FindFeature(session, acl).find(test));
@@ -92,7 +93,7 @@ public class S3DirectoryFeatureTest extends AbstractS3Test {
         final S3DirectoryFeature feature = new S3DirectoryFeature(session, acl);
         for(Location.Name region : Collections.singletonList(new S3LocationFeature.S3Region("us-east-1"))) {
             final Path test = new Path(new DefaultHomeFinderService(session).find(), new AsciiRandomStringService(30).random(), EnumSet.of(Path.Type.directory, Path.Type.volume));
-            assertTrue(feature.isSupported(test.getParent(), test.getName()));
+            assertTrue(feature.isSupported(test.getParent(), Optional.of(test.getName())));
             test.attributes().setRegion(region.getIdentifier());
             feature.mkdir(new S3WriteFeature(session, new S3AccessControlListFeature(session)), test, new TransferStatus().setRegion(region.getIdentifier()));
             assertTrue(new S3FindFeature(session, acl).find(test));
@@ -125,7 +126,7 @@ public class S3DirectoryFeatureTest extends AbstractS3Test {
         final S3DirectoryFeature feature = new S3DirectoryFeature(session, acl);
         for(Location.Name region : Collections.singletonList(new S3LocationFeature.S3Region("us-east-1"))) {
             final Path test = new Path(new DefaultHomeFinderService(session).find(), new AsciiRandomStringService(30).random(), EnumSet.of(Path.Type.directory, Path.Type.volume));
-            assertTrue(feature.isSupported(test.getParent(), test.getName()));
+            assertTrue(feature.isSupported(test.getParent(), Optional.of(test.getName())));
             test.attributes().setRegion(region.getIdentifier());
             feature.mkdir(new S3WriteFeature(session, new S3AccessControlListFeature(session)), test, new TransferStatus().setRegion(region.getIdentifier()));
             assertTrue(new S3FindFeature(session, acl).find(test));
@@ -139,8 +140,8 @@ public class S3DirectoryFeatureTest extends AbstractS3Test {
     public void testCreateBucketInvalidName() throws Exception {
         final S3AccessControlListFeature acl = new S3AccessControlListFeature(session);
         final Path test = new Path(new DefaultHomeFinderService(session).find(), "untitled folder", EnumSet.of(Path.Type.directory, Path.Type.volume));
-        assertFalse(new S3DirectoryFeature(session, acl).isSupported(test.getParent(), test.getName()));
+        assertFalse(new S3DirectoryFeature(session, acl).isSupported(test.getParent(), Optional.of(test.getName())));
-        assertTrue(new S3DirectoryFeature(virtualhost, acl).isSupported(test.getParent(), test.getName()));
+        assertTrue(new S3DirectoryFeature(virtualhost, acl).isSupported(test.getParent(), Optional.of(test.getName())));
         final S3LocationFeature.S3Region region = new S3LocationFeature.S3Region("eu-west-2");
         test.attributes().setRegion(region.getIdentifier());
         new S3DirectoryFeature(session, acl).mkdir(new S3WriteFeature(session, new S3AccessControlListFeature(session)), test, new TransferStatus().setRegion(region.getIdentifier()));

s3/src/test/java/ch/cyberduck/core/s3/S3TouchFeatureTest.java

@@ -14,12 +14,12 @@ import ch.cyberduck.core.shared.DefaultFindFeature;
 import ch.cyberduck.core.transfer.TransferStatus;
 import ch.cyberduck.test.IntegrationTest;
 
-import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.*;
 
@@ -29,10 +29,10 @@ public class S3TouchFeatureTest extends AbstractS3Test {
     @Test
     public void testFile() {
         final S3AccessControlListFeature acl = new S3AccessControlListFeature(session);
-        assertFalse(new S3TouchFeature(session, acl).isSupported(Home.root(), StringUtils.EMPTY));
+        assertFalse(new S3TouchFeature(session, acl).isSupported(Home.root(), Optional.empty()));
-        assertTrue(new S3TouchFeature(session, acl).isSupported(new Path(Home.root(), "/container", EnumSet.of(Path.Type.volume, Path.Type.directory)), StringUtils.EMPTY));
+        assertTrue(new S3TouchFeature(session, acl).isSupported(new Path(Home.root(), "/container", EnumSet.of(Path.Type.volume, Path.Type.directory)), Optional.empty()));
-        assertTrue(new S3TouchFeature(virtualhost, acl).isSupported(Home.root(), StringUtils.EMPTY));
+        assertTrue(new S3TouchFeature(virtualhost, acl).isSupported(Home.root(), Optional.empty()));
-        assertTrue(new S3TouchFeature(virtualhost, acl).isSupported(new Path(Home.root(), "/container", EnumSet.of(Path.Type.volume, Path.Type.directory)), StringUtils.EMPTY));
+        assertTrue(new S3TouchFeature(virtualhost, acl).isSupported(new Path(Home.root(), "/container", EnumSet.of(Path.Type.volume, Path.Type.directory)), Optional.empty()));
     }
 
     @Test
@@ -41,8 +41,8 @@ public class S3TouchFeatureTest extends AbstractS3Test {
         final S3AccessControlListFeature acl = new S3AccessControlListFeature(session);
         final S3TouchFeature feature = new S3TouchFeature(session, acl);
         final String filename = new AsciiRandomStringService().random();
-        assertFalse(feature.isSupported(Home.root(), filename));
+        assertFalse(feature.isSupported(Home.root(), Optional.of(filename)));
-        assertTrue(feature.isSupported(container, filename));
+        assertTrue(feature.isSupported(container, Optional.of(filename)));
         final Path test = feature.touch(new S3WriteFeature(session, new S3AccessControlListFeature(session)), new Path(container, filename, EnumSet.of(Path.Type.file)), new TransferStatus());
         assertNull(test.attributes().getVersionId());
         assertTrue(new S3FindFeature(session, acl).find(test));
@@ -57,7 +57,7 @@ public class S3TouchFeatureTest extends AbstractS3Test {
         final S3AccessControlListFeature acl = new S3AccessControlListFeature(virtualhost);
         final S3TouchFeature feature = new S3TouchFeature(virtualhost, acl);
         final String filename = new AsciiRandomStringService().random();
-        assertTrue(feature.isSupported(Home.root(), filename));
+        assertTrue(feature.isSupported(Home.root(), Optional.of(filename)));
         final Path test = feature.touch(new S3WriteFeature(virtualhost, new S3AccessControlListFeature(virtualhost)), new Path(filename, EnumSet.of(Path.Type.file)), new TransferStatus());
         assertNull(test.attributes().getVersionId());
         assertTrue(new S3FindFeature(virtualhost, acl).find(test));

spectra/src/main/java/ch/cyberduck/core/spectra/SpectraTouchFeature.java

@@ -29,6 +29,7 @@ import org.jets3t.service.model.StorageObject;
 
 import java.text.MessageFormat;
 import java.util.Collections;
+import java.util.Optional;
 
 public class SpectraTouchFeature extends DefaultTouchFeature<StorageObject> {
 
@@ -47,7 +48,7 @@ public class SpectraTouchFeature extends DefaultTouchFeature<StorageObject> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         // Creating files is only possible inside a bucket.
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);

spectra/src/test/java/ch/cyberduck/core/spectra/SpectraTouchFeatureTest.java

@@ -22,12 +22,12 @@ import ch.cyberduck.core.features.Home;
 import ch.cyberduck.core.transfer.TransferStatus;
 import ch.cyberduck.test.IntegrationTest;
 
-import org.apache.commons.lang3.StringUtils;
 import org.junit.Test;
 import org.junit.experimental.categories.Category;
 
 import java.util.Collections;
 import java.util.EnumSet;
+import java.util.Optional;
 
 import static org.junit.Assert.assertFalse;
 import static org.junit.Assert.assertTrue;
@@ -37,8 +37,8 @@ public class SpectraTouchFeatureTest extends AbstractSpectraTest {
 
     @Test
     public void testFile() {
-        assertFalse(new SpectraTouchFeature(session).isSupported(Home.root(), StringUtils.EMPTY));
+        assertFalse(new SpectraTouchFeature(session).isSupported(Home.root(), Optional.empty()));
-        assertTrue(new SpectraTouchFeature(session).isSupported(new Path(Home.root(), "/container", EnumSet.of(Path.Type.directory, Path.Type.volume)), StringUtils.EMPTY));
+        assertTrue(new SpectraTouchFeature(session).isSupported(new Path(Home.root(), "/container", EnumSet.of(Path.Type.directory, Path.Type.volume)), Optional.empty()));
     }
 
     @Test

storegate/src/main/java/ch/cyberduck/core/storegate/StoregateDirectoryFeature.java

@@ -28,6 +28,7 @@ import ch.cyberduck.core.storegate.io.swagger.client.model.File;
 import ch.cyberduck.core.transfer.TransferStatus;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class StoregateDirectoryFeature implements Directory<File> {
 
@@ -56,7 +57,7 @@ public class StoregateDirectoryFeature implements Directory<File> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create folder {0}", "Error"), filename)).withFile(workdir);
         }

storegate/src/main/java/ch/cyberduck/core/storegate/StoregateTouchFeature.java

@@ -23,6 +23,7 @@ import ch.cyberduck.core.shared.DefaultTouchFeature;
 import ch.cyberduck.core.storegate.io.swagger.client.model.File;
 
 import java.text.MessageFormat;
+import java.util.Optional;
 
 public class StoregateTouchFeature extends DefaultTouchFeature<File> {
 
@@ -31,7 +32,7 @@ public class StoregateTouchFeature extends DefaultTouchFeature<File> {
     }
 
     @Override
-    public void preflight(final Path workdir, final String filename) throws BackgroundException {
+    public void preflight(final Path workdir, final Optional<String> filename) throws BackgroundException {
         if(workdir.isRoot()) {
             throw new AccessDeniedException(MessageFormat.format(LocaleFactory.localizedString("Cannot create {0}", "Error"), filename)).withFile(workdir);
         }

windows/src/main/csharp/ch/cyberduck/ui/controller/BrowserController.cs

@@ -1014,7 +1014,7 @@ namespace Ch.Cyberduck.Ui.Controller
                         return;
                 }
                 Touch feature = (Touch)Pool.getFeature(typeof(Touch));
-                if (!feature.isSupported(destination, String.Empty))
+                if (!feature.isSupported(destination, Optional.empty()))
                 {
                     args.Effect = DragDropEffects.None;
                     args.DropTargetLocation = DropTargetLocation.None;
@@ -1885,14 +1885,14 @@ namespace Ch.Cyberduck.Ui.Controller
         {
             return IsMounted() &&
                    ((Touch)Pool.getFeature(typeof(Touch))).isSupported(
-                       new UploadTargetFinder(Workdir).find(SelectedPath), String.Empty);
+                       new UploadTargetFinder(Workdir).find(SelectedPath), Optional.empty());
         }
 
         private bool View_ValidateUpload()
         {
             return IsMounted() &&
                    ((Touch)Pool.getFeature(typeof(Touch))).isSupported(
-                       new UploadTargetFinder(Workdir).find(SelectedPath), String.Empty);
+                       new UploadTargetFinder(Workdir).find(SelectedPath), Optional.empty());
         }
 
         private void View_Upload()
@@ -2061,7 +2061,7 @@ namespace Ch.Cyberduck.Ui.Controller
         {
             return IsMounted() &&
                    ((Directory)Pool.getFeature(typeof(Directory))).isSupported(
-                       new UploadTargetFinder(Workdir).find(SelectedPath), String.Empty);
+                       new UploadTargetFinder(Workdir).find(SelectedPath), Optional.empty());
         }
 
         private bool View_ValidateNewVault()
@@ -2069,7 +2069,7 @@ namespace Ch.Cyberduck.Ui.Controller
             return IsMounted() && Pool.getVaultRegistry() != VaultRegistry.DISABLED &&
                    !Pool.getVaultRegistry().contains(Workdir) &&
                    ((Directory)Pool.getFeature(typeof(Directory))).isSupported(
-                       new UploadTargetFinder(Workdir).find(SelectedPath), String.Empty);
+                       new UploadTargetFinder(Workdir).find(SelectedPath), Optional.empty());
         }
 
         private void View_DuplicateFile()
@@ -2263,7 +2263,7 @@ namespace Ch.Cyberduck.Ui.Controller
                             return;
                     }
                     Touch feature = (Touch)Pool.getFeature(typeof(Touch));
-                    if (!feature.isSupported(destination, String.Empty))
+                    if (!feature.isSupported(destination, Optional.empty()))
                     {
                         Log.trace("Pool does not allow file creation");
                         args.Effect = DragDropEffects.None;