add option to set maxCleartextNameLimit

src/main/java/org/cryptomator/cli/CryptomatorCli.java

@@ -2,6 +2,7 @@
 
 import org.cryptomator.cryptofs.CryptoFileSystemProperties;
 import org.cryptomator.cryptofs.CryptoFileSystemProvider;
+import org.cryptomator.cryptofs.VaultConfig;
 import org.cryptomator.cryptolib.api.Masterkey;
 import org.cryptomator.cryptolib.common.MasterkeyFileAccess;
 import org.cryptomator.integrations.mount.UnmountFailedException;
@@ -14,6 +15,8 @@
 import java.io.IOException;
 import java.net.URI;
 import java.nio.CharBuffer;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.security.SecureRandom;
 import java.util.concurrent.Callable;
@@ -26,7 +29,10 @@ public class CryptomatorCli implements Callable<Integer> {
 
     private static final Logger LOG = LoggerFactory.getLogger(CryptomatorCli.class);
     private static final byte[] PEPPER = new byte[0];
+    private static final String CONFIG_FILE_NAME = "vault.cryptomator";
 
+    @CommandLine.Spec
+    CommandLine.Model.CommandSpec spec;
 
     @Parameters(index = "0", paramLabel = "/path/to/vaultDirectory", description = "Path to the vault directory")
     Path pathToVault;
@@ -37,17 +43,33 @@ public class CryptomatorCli implements Callable<Integer> {
     @CommandLine.ArgGroup(exclusive = false, multiplicity = "1")
     MountOptions mountOptions;
 
+    @CommandLine.Option(names = {"--maxCleartextNameLength"}, description = "Maximum cleartext filename length limit of created files. Remark: If this limit is greater than the shortening threshold, it does not have any effect.")
+    void setMaxCleartextNameLength(int input) {
+        if (input <= 0) {
+            throw new CommandLine.ParameterException(spec.commandLine(),
+                    String.format("Invalid value '%d' for option '--maxCleartextNameLength': " +
+                            "value must be a positive Number between 1 and %d.", input, Integer.MAX_VALUE));
+        }
+        maxCleartextNameLength = input;
+    }
+
+    private int maxCleartextNameLength = 0;
+
     private SecureRandom csrpg = null;
 
     @Override
     public Integer call() throws Exception {
         csrpg = SecureRandom.getInstanceStrong();
-        CryptoFileSystemProperties fsProps = CryptoFileSystemProperties.cryptoFileSystemProperties() //
+
+        var unverifiedConfig = readConfigFromStorage(pathToVault);
+        var fsPropsBuilder = CryptoFileSystemProperties.cryptoFileSystemProperties() //
                 .withKeyLoader(this::loadMasterkey) //
-                //TODO: shortening Threshold
-                //TODO: maxCleartextname
-                .build();
-        try (var fs = CryptoFileSystemProvider.newFileSystem(pathToVault, fsProps);
+                .withShorteningThreshold(unverifiedConfig.allegedShorteningThreshold()); //cryptofs checks, if config is signed with masterkey
+        if (maxCleartextNameLength > 0) {
+            fsPropsBuilder.withMaxCleartextNameLength(maxCleartextNameLength);
+        }
+
+        try (var fs = CryptoFileSystemProvider.newFileSystem(pathToVault, fsPropsBuilder.build());
              var mount = mountOptions.mount(fs)) {
             System.out.println(mount.getMountpoint().uri());
             while (true) {
@@ -74,6 +96,17 @@ private Masterkey loadMasterkey(URI keyId) {
         }
     }
 
+    /**
+     * Attempts to read the vault config file and parse it without verifying its integrity.
+     *
+     * @throws IOException if reading the file fails
+     */
+    static VaultConfig.UnverifiedVaultConfig readConfigFromStorage(Path vaultPath) throws IOException {
+        Path configPath = vaultPath.resolve(CONFIG_FILE_NAME);
+        String token = Files.readString(configPath, StandardCharsets.US_ASCII);
+        return VaultConfig.decode(token);
+    }
+
     public static void main(String... args) {
         int exitCode = new CommandLine(new CryptomatorCli())
                 .setPosixClusteredShortOptionsAllowed(false)