Feature/#98 change vault init

src/main/java/org/cryptomator/cryptofs/ContentRootMissingException.java

@@ -0,0 +1,10 @@
+package org.cryptomator.cryptofs;
+
+import java.nio.file.NoSuchFileException;
+
+public class ContentRootMissingException extends NoSuchFileException {
+
+	public ContentRootMissingException(String msg) {
+		super(msg);
+	}
+}

src/main/java/org/cryptomator/cryptofs/CryptoFileSystemImpl.java

@@ -105,7 +105,7 @@ public CryptoFileSystemImpl(CryptoFileSystemProvider provider, CryptoFileSystems
 								PathMatcherFactory pathMatcherFactory, DirectoryStreamFactory directoryStreamFactory, DirectoryIdProvider dirIdProvider,
 								AttributeProvider fileAttributeProvider, AttributeByNameProvider fileAttributeByNameProvider, AttributeViewProvider fileAttributeViewProvider,
 								OpenCryptoFiles openCryptoFiles, Symlinks symlinks, FinallyUtil finallyUtil, CiphertextDirectoryDeleter ciphertextDirDeleter, ReadonlyFlag readonlyFlag,
-								CryptoFileSystemProperties fileSystemProperties, RootDirectoryInitializer rootDirectoryInitializer) {
+								CryptoFileSystemProperties fileSystemProperties) {
 		this.provider = provider;
 		this.cryptoFileSystems = cryptoFileSystems;
 		this.pathToVault = pathToVault;
@@ -129,8 +129,6 @@ public CryptoFileSystemImpl(CryptoFileSystemProvider provider, CryptoFileSystems
 
 		this.rootPath = cryptoPathFactory.rootFor(this);
 		this.emptyPath = cryptoPathFactory.emptyFor(this);
-
-		rootDirectoryInitializer.initialize(rootPath);
 	}
 
 	@Override

src/main/java/org/cryptomator/cryptofs/CryptoFileSystemProvider.java

@@ -11,6 +11,7 @@
 import org.cryptomator.cryptofs.ch.AsyncDelegatingFileChannel;
 import org.cryptomator.cryptofs.common.Constants;
 import org.cryptomator.cryptofs.common.FileSystemCapabilityChecker;
+import org.cryptomator.cryptolib.api.Cryptor;
 import org.cryptomator.cryptolib.api.Masterkey;
 import org.cryptomator.cryptolib.api.MasterkeyLoadingFailedException;
 
@@ -140,16 +141,18 @@ public static void initialize(Path pathToVault, CryptoFileSystemProperties prope
 			throw new NotDirectoryException(pathToVault.toString());
 		}
 		byte[] rawKey = new byte[0];
-		try (Masterkey key = properties.keyLoader(keyId.getScheme()).loadKey(keyId)) {
+		var config = VaultConfig.createNew().cipherCombo(properties.cipherCombo()).maxFilenameLength(properties.maxNameLength()).build();
+		try (Masterkey key = properties.keyLoader(keyId.getScheme()).loadKey(keyId);
+			 Cryptor cryptor = config.getCipherCombo().getCryptorProvider(strongSecureRandom()).withKey(key)) {
 			rawKey = key.getEncoded();
 			// save vault config:
 			Path vaultConfigPath = pathToVault.resolve(properties.vaultConfigFilename());
-			var config = VaultConfig.createNew().cipherCombo(properties.cipherCombo()).maxFilenameLength(properties.maxNameLength()).build();
 			var token = config.toToken(keyId.toString(), rawKey);
 			Files.writeString(vaultConfigPath, token, StandardCharsets.US_ASCII, WRITE, CREATE_NEW);
-			// create "d" dir:
-			Path dataDirPath = pathToVault.resolve(Constants.DATA_DIR_NAME);
-			Files.createDirectories(dataDirPath);
+			// create "d" dir and root:
+			String dirHash = cryptor.fileNameCryptor().hashDirectoryId(Constants.ROOT_DIR_ID);
+			Path vaultCipherRootPath = pathToVault.resolve(Constants.DATA_DIR_NAME).resolve(dirHash.substring(0, 2)).resolve(dirHash.substring(2));
+			Files.createDirectories(vaultCipherRootPath);
 		} finally {
 			Arrays.fill(rawKey, (byte) 0x00);
 		}

src/main/java/org/cryptomator/cryptofs/CryptoFileSystems.java

@@ -54,21 +54,41 @@ public CryptoFileSystemImpl create(CryptoFileSystemProvider provider, Path pathT
 			rawKey = key.getEncoded();
 			var config = configLoader.verify(rawKey, Constants.VAULT_VERSION);
 			var adjustedProperties = adjustForCapabilities(pathToVault, properties);
-			return fileSystems.compute(normalizedPathToVault, (path, fs) -> {
-				if (fs == null) {
-					return create(provider, normalizedPathToVault, adjustedProperties, key, config);
-				} else {
-					throw new FileSystemAlreadyExistsException();
-				}
-			});
+			var cryptor = config.getCipherCombo().getCryptorProvider(csprng).withKey(key);
+			try {
+				checkVaultRootExistence(pathToVault, cryptor);
+				return fileSystems.compute(normalizedPathToVault, (path, fs) -> {
+					if (fs == null) {
+						return create(provider, normalizedPathToVault, adjustedProperties, cryptor, config);
+					} else {
+						throw new FileSystemAlreadyExistsException();
+					}
+				});
+			} catch (Exception e) { //on any exception, destroy the cryptor
+				cryptor.destroy();
+				throw e;
+			}
 		} finally {
 			Arrays.fill(rawKey, (byte) 0x00);
 		}
 	}
 
+	/**
+	 * Checks if the vault has a content root folder. If not, an exception is raised.
+	 * @param pathToVault Path to the vault root
+	 * @param cryptor Cryptor object initialized with the correct masterkey
+	 * @throws ContentRootMissingException If the existence of encrypted vault content root cannot be ensured
+	 */
+	private void checkVaultRootExistence(Path pathToVault, Cryptor cryptor) throws ContentRootMissingException {
+		String dirHash = cryptor.fileNameCryptor().hashDirectoryId(Constants.ROOT_DIR_ID);
+		Path vaultCipherRootPath = pathToVault.resolve(Constants.DATA_DIR_NAME).resolve(dirHash.substring(0, 2)).resolve(dirHash.substring(2));
+		if (!Files.exists(vaultCipherRootPath)) {
+			throw new ContentRootMissingException("The encrypted root directory of the vault " + pathToVault + " is missing.");
+		}
+	}
+
 	// synchronized access to non-threadsafe cryptoFileSystemComponentBuilder required
-	private synchronized CryptoFileSystemImpl create(CryptoFileSystemProvider provider, Path pathToVault, CryptoFileSystemProperties properties, Masterkey masterkey, VaultConfig config) {
-		Cryptor cryptor = config.getCipherCombo().getCryptorProvider(csprng).withKey(masterkey);
+	private synchronized CryptoFileSystemImpl create(CryptoFileSystemProvider provider, Path pathToVault, CryptoFileSystemProperties properties, Cryptor cryptor, VaultConfig config) {
 		return cryptoFileSystemComponentBuilder //
 				.cryptor(cryptor) //
 				.vaultConfig(config) //
@@ -83,9 +103,9 @@ private synchronized CryptoFileSystemImpl create(CryptoFileSystemProvider provid
 	 * Attempts to read a vault config file
 	 *
 	 * @param pathToVault path to the vault's root
-	 * @param properties  properties used when attempting to construct a fs for this vault
+	 * @param properties properties used when attempting to construct a fs for this vault
 	 * @return The contents of the file decoded in ASCII
-	 * @throws IOException                       If the file could not be read
+	 * @throws IOException If the file could not be read
 	 * @throws FileSystemNeedsMigrationException If the file doesn't exists, but a legacy masterkey file was found instead
 	 */
 	private String readVaultConfigFile(Path pathToVault, CryptoFileSystemProperties properties) throws IOException, FileSystemNeedsMigrationException {

src/test/java/org/cryptomator/cryptofs/CryptoFileSystemImplTest.java

@@ -95,7 +95,6 @@ public class CryptoFileSystemImplTest {
 	private final PathMatcherFactory pathMatcherFactory = mock(PathMatcherFactory.class);
 	private final CryptoPathFactory cryptoPathFactory = mock(CryptoPathFactory.class);
 	private final CryptoFileSystemStats stats = mock(CryptoFileSystemStats.class);
-	private final RootDirectoryInitializer rootDirectoryInitializer = mock(RootDirectoryInitializer.class);
 	private final DirectoryStreamFactory directoryStreamFactory = mock(DirectoryStreamFactory.class);
 	private final FinallyUtil finallyUtil = mock(FinallyUtil.class);
 	private final CiphertextDirectoryDeleter ciphertextDirDeleter = mock(CiphertextDirectoryDeleter.class);
@@ -124,7 +123,7 @@ public void setup() {
 				pathMatcherFactory, directoryStreamFactory, dirIdProvider,
 				fileAttributeProvider, fileAttributeByNameProvider, fileAttributeViewProvider,
 				openCryptoFiles, symlinks, finallyUtil, ciphertextDirDeleter, readonlyFlag,
-				fileSystemProperties, rootDirectoryInitializer);
+				fileSystemProperties);
 	}
 
 	@Test

src/test/java/org/cryptomator/cryptofs/CryptoFileSystemProviderTest.java

@@ -37,6 +37,7 @@
 import java.nio.file.spi.FileSystemProvider;
 import java.util.HashSet;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.ExecutorService;
 import java.util.stream.Stream;
@@ -187,6 +188,14 @@ public void testInitialize() throws IOException, MasterkeyLoadingFailedException
 
 		Assertions.assertTrue(Files.isDirectory(dataDir));
 		Assertions.assertTrue(Files.isRegularFile(vaultConfigFile));
+
+		Optional<Path> preRootDir = Files.list(dataDir).findFirst();
+		Assertions.assertTrue(preRootDir.isPresent());
+		Assertions.assertTrue(Files.isDirectory(preRootDir.get()));
+
+		Optional<Path> rootDir = Files.list(preRootDir.get()).findFirst();
+		Assertions.assertTrue(rootDir.isPresent());
+		Assertions.assertTrue(Files.isDirectory(rootDir.get()));
 	}
 
 	@Test

src/test/java/org/cryptomator/cryptofs/CryptoFileSystemsTest.java

@@ -4,6 +4,7 @@
 import org.cryptomator.cryptofs.common.FileSystemCapabilityChecker;
 import org.cryptomator.cryptolib.api.Cryptor;
 import org.cryptomator.cryptolib.api.CryptorProvider;
+import org.cryptomator.cryptolib.api.FileNameCryptor;
 import org.cryptomator.cryptolib.api.Masterkey;
 import org.cryptomator.cryptolib.api.MasterkeyLoader;
 import org.cryptomator.cryptolib.api.MasterkeyLoadingFailedException;
@@ -35,6 +36,9 @@ public class CryptoFileSystemsTest {
 	private final Path pathToVault = mock(Path.class, "vaultPath");
 	private final Path normalizedPathToVault = mock(Path.class, "normalizedVaultPath");
 	private final Path configFilePath = mock(Path.class, "normalizedVaultPath/vault.cryptomator");
+	private final Path dataDirPath = mock(Path.class, "normalizedVaultPath/d");
+	private final Path preContenRootPath = mock(Path.class, "normalizedVaultPath/d/AB");
+	private final Path contenRootPath = mock(Path.class, "normalizedVaultPath/d/AB/CDEFGHIJKLMNOP");
 	private final FileSystemCapabilityChecker capabilityChecker = mock(FileSystemCapabilityChecker.class);
 	private final CryptoFileSystemProvider provider = mock(CryptoFileSystemProvider.class);
 	private final CryptoFileSystemProperties properties = mock(CryptoFileSystemProperties.class);
@@ -49,6 +53,7 @@ public class CryptoFileSystemsTest {
 	private final SecureRandom csprng = Mockito.mock(SecureRandom.class);
 	private final CryptorProvider cryptorProvider = mock(CryptorProvider.class);
 	private final Cryptor cryptor = mock(Cryptor.class);
+	private final FileNameCryptor fileNameCryptor = mock(FileNameCryptor.class);
 	private final CryptoFileSystemComponent.Builder cryptoFileSystemComponentBuilder = mock(CryptoFileSystemComponent.Builder.class);
 
 
@@ -76,6 +81,12 @@ public void setup() throws IOException, MasterkeyLoadingFailedException {
 		when(vaultConfig.getCipherCombo()).thenReturn(cipherCombo);
 		when(cipherCombo.getCryptorProvider(csprng)).thenReturn(cryptorProvider);
 		when(cryptorProvider.withKey(masterkey)).thenReturn(cryptor);
+		when(cryptor.fileNameCryptor()).thenReturn(fileNameCryptor);
+		when(fileNameCryptor.hashDirectoryId("")).thenReturn("ABCDEFGHIJKLMNOP");
+		when(pathToVault.resolve(Constants.DATA_DIR_NAME)).thenReturn(dataDirPath);
+		when(dataDirPath.resolve("AB")).thenReturn(preContenRootPath);
+		when(preContenRootPath.resolve("CDEFGHIJKLMNOP")).thenReturn(contenRootPath);
+		filesClass.when(() -> Files.exists(contenRootPath)).thenReturn(true);
 		when(cryptoFileSystemComponentBuilder.cryptor(any())).thenReturn(cryptoFileSystemComponentBuilder);
 		when(cryptoFileSystemComponentBuilder.vaultConfig(any())).thenReturn(cryptoFileSystemComponentBuilder);
 		when(cryptoFileSystemComponentBuilder.pathToVault(any())).thenReturn(cryptoFileSystemComponentBuilder);
@@ -130,6 +141,12 @@ public void testCreateDoesNotThrowFileSystemAlreadyExistsExceptionIfFileSystemIs
 		Assertions.assertTrue(inTest.contains(fileSystem2));
 	}
 
+	@Test
+	public void testCreateThrowsIOExceptionIfContentRootExistenceCheckFails() {
+		filesClass.when(() -> Files.exists(contenRootPath)).thenReturn(false);
+		Assertions.assertThrows(IOException.class, () -> inTest.create(provider, pathToVault, properties));
+	}
+
 	@Test
 	public void testGetReturnsFileSystemForPathIfItExists() throws IOException, MasterkeyLoadingFailedException {
 		CryptoFileSystemImpl fileSystem = inTest.create(provider, pathToVault, properties);