Add vault creation command with default values

Author: dchenz

src/main/java/module-info.java

@@ -10,6 +10,7 @@
     requires org.fusesource.jansi;
     requires ch.qos.logback.core;
     requires ch.qos.logback.classic;
+    requires org.cryptomator.cryptolib;
 
     provides Configurator with LogbackConfigurator;
 }

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

@@ -0,0 +1,92 @@
+package org.cryptomator.cli;
+
+import org.cryptomator.cryptofs.CryptoFileSystemProperties;
+import org.cryptomator.cryptofs.CryptoFileSystemProvider;
+import org.cryptomator.cryptolib.api.CryptoException;
+import org.cryptomator.cryptolib.api.CryptorProvider;
+import org.cryptomator.cryptolib.api.Masterkey;
+import org.cryptomator.cryptolib.common.MasterkeyFileAccess;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import picocli.CommandLine.ArgGroup;
+import picocli.CommandLine.Command;
+import picocli.CommandLine.Mixin;
+import picocli.CommandLine.Model;
+import picocli.CommandLine.Parameters;
+import picocli.CommandLine.Spec;
+
+import java.io.IOException;
+import java.net.URI;
+import java.nio.CharBuffer;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.SecureRandom;
+import java.util.concurrent.Callable;
+
+@Command(
+        name = "create",
+        header = "Creates a vault",
+        description = "Creates a new cryptomator vault at the specified path.",
+        parameterListHeading = "%nParameters:%n",
+        headerHeading = "Usage:%n%n",
+        synopsisHeading = "%n",
+        descriptionHeading = "%nDescription:%n%n",
+        optionListHeading = "%nOptions:%n",
+        mixinStandardHelpOptions = true)
+public class Create implements Callable<Integer> {
+
+    private static final Logger LOG = LoggerFactory.getLogger(Create.class);
+    private static final byte[] PEPPER = new byte[0];
+    private static final String MASTERKEY_FILE_NAME = "masterkey.cryptomator";
+    private static final URI DEFAULT_KEY_ID = URI.create("masterkeyfile:" + MASTERKEY_FILE_NAME);
+
+    @Spec Model.CommandSpec spec;
+    @Mixin LoggingMixin loggingMixin;
+
+    @Parameters(
+            index = "0",
+            paramLabel = "/path/to/vaultDirectory",
+            description = "Path to the vault directory")
+    Path pathToVault;
+
+    @ArgGroup(multiplicity = "1")
+    PasswordSource passwordSource;
+
+    private SecureRandom csprng = null;
+
+    @Override
+    public Integer call() throws Exception {
+        csprng = SecureRandom.getInstanceStrong();
+
+        createVault(pathToVault);
+
+        LOG.info("Vault created successfully in {}", pathToVault);
+        return 0;
+    }
+
+    private void createVault(Path path) throws IOException {
+        // Throw exception if there's something already there.
+        Files.createDirectory(path);
+
+        try (var passphraseContainer = passwordSource.readPassphrase();
+                var masterkey = Masterkey.generate(csprng)) {
+
+            Path masterkeyFilePath = path.resolve(MASTERKEY_FILE_NAME);
+            MasterkeyFileAccess masterkeyFileAccess = new MasterkeyFileAccess(PEPPER, csprng);
+            masterkeyFileAccess.persist(
+                    masterkey, masterkeyFilePath, CharBuffer.wrap(passphraseContainer.content()));
+
+            try {
+                CryptoFileSystemProperties fsProps =
+                        CryptoFileSystemProperties.cryptoFileSystemProperties()
+                                .withCipherCombo(CryptorProvider.Scheme.SIV_GCM)
+                                .withKeyLoader(ignored -> masterkey.copy())
+                                .build();
+                CryptoFileSystemProvider.initialize(path, fsProps, DEFAULT_KEY_ID);
+            } catch (CryptoException e) {
+                throw new IOException("Vault initialization failed", e);
+            }
+        }
+    }
+}

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

@@ -12,7 +12,7 @@
         mixinStandardHelpOptions = true,
         version = "${org.cryptomator.cli.version}",
         description = "Unlocks a cryptomator vault and mounts it into the system.",
-        subcommands = { Unlock.class, ListMounters.class, CommandLine.HelpCommand.class})
+        subcommands = {Create.class, Unlock.class, ListMounters.class, CommandLine.HelpCommand.class})
 public class CryptomatorCli {
 
     private static final Logger LOG = LoggerFactory.getLogger(CryptomatorCli.class);