Include c9u in allowed file extensions when listing encrypted directories

Author: infeo

src/main/java/org/cryptomator/cryptofs/dir/DirectoryStreamFactory.java

@@ -15,10 +15,13 @@
 import java.nio.file.Path;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Set;
 
 @CryptoFileSystemScoped
 public class DirectoryStreamFactory {
 
+	private static final Set<String> FILE_EXTENSIONS = Set.of(Constants.CRYPTOMATOR_FILE_SUFFIX, Constants.DEFLATED_FILE_SUFFIX, Constants.INUSE_FILE_SUFFIX);
+
 	private final CryptoPathMapper cryptoPathMapper;
 	private final DirectoryStreamComponent.Factory directoryStreamComponentFactory;
 	private final Map<CryptoDirectoryStream, DirectoryStream<Path>> streams = new HashMap<>();
@@ -47,7 +50,7 @@ public synchronized CryptoDirectoryStream newDirectoryStream(CryptoPath cleartex
 	boolean matchesEncryptedContentPattern(Path path) {
 		var tmp = path.getFileName().toString();
 		return tmp.length() >= Constants.MIN_CIPHER_NAME_LENGTH //
-				&& (tmp.endsWith(Constants.CRYPTOMATOR_FILE_SUFFIX) || tmp.endsWith(Constants.DEFLATED_FILE_SUFFIX));
+				&& FILE_EXTENSIONS.stream().anyMatch(tmp::endsWith);
 	}
 
 	public synchronized void close() throws IOException {

src/test/java/org/cryptomator/cryptofs/dir/DirectoryStreamFactoryTest.java

@@ -104,7 +104,7 @@ public void testNewDirectoryStreamAfterClosedThrowsClosedFileSystemException() t
 		});
 	}
 
-	@DisplayName("CiphertextDirStream only contains files with names at least 26 chars long and ending with .c9r or .c9s")
+	@DisplayName("CiphertextDirStream only contains files with names at least 26 chars long and ending with .c9r, .c9s or .c9u")
 	@ParameterizedTest
 	@MethodSource("provideFilterExamples")
 	public void testCiphertextDirStreamFilter(String fileName, boolean expected) {
@@ -119,10 +119,12 @@ public void testCiphertextDirStreamFilter(String fileName, boolean expected) {
 
 	private static Stream<Arguments> provideFilterExamples() {
 		return Stream.of( //
+				Arguments.of("b".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 5)+".c9u", false), //
 				Arguments.of("b".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 5)+".c9r", false), //
 				Arguments.of("b".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 5)+".c9s", false), //
 				Arguments.of("a".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 4)+".c9r", true), //
-				Arguments.of("a".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 4)+".c9s", true));
+				Arguments.of("a".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 4)+".c9s", true), //
+				Arguments.of("a".repeat(Constants.MIN_CIPHER_NAME_LENGTH - 4)+".c9u", true));
 	}
 
 }