drop multipe vaults at once

main/commons/src/main/java/org/cryptomator/common/settings/VaultSettings.java

@@ -6,6 +6,7 @@
 package org.cryptomator.common.settings;
 
 import com.google.common.base.Strings;
+import com.google.common.io.BaseEncoding;
 import javafx.beans.Observable;
 import javafx.beans.property.BooleanProperty;
 import javafx.beans.property.ObjectProperty;
@@ -23,6 +24,7 @@ import java.util.Base64;
 import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
+import java.util.Random;
 import java.util.UUID;
 
 /**
@@ -36,6 +38,8 @@ public class VaultSettings {
 	public static final boolean DEFAULT_USES_INDIVIDUAL_MOUNTPATH = false;
 	public static final boolean DEFAULT_USES_READONLY_MODE = false;
 	public static final String DEFAULT_MOUNT_FLAGS = "";
+	
+	private static final Random RNG = new Random(); 
 
 	private final String id;
 	private final ObjectProperty<Path> path = new SimpleObjectProperty();
@@ -69,20 +73,9 @@ public class VaultSettings {
 	}
 
 	private static String generateId() {
-		return asBase64String(nineBytesFrom(UUID.randomUUID()));
-	}
-
-	private static String asBase64String(byte[] bytes) {
-		byte[] base64Bytes = Base64.getUrlEncoder().encode(bytes);
-		return new String(base64Bytes, StandardCharsets.US_ASCII);
-	}
-
-	private static byte[] nineBytesFrom(UUID uuid) {
-		ByteBuffer uuidBuffer = ByteBuffer.allocate(9);
-		uuidBuffer.putLong(uuid.getMostSignificantBits());
-		uuidBuffer.put((byte) (uuid.getLeastSignificantBits() & 0xFF));
-		uuidBuffer.flip();
-		return uuidBuffer.array();
+		byte[] randomBytes = new byte[9];
+		RNG.nextBytes(randomBytes);
+		return BaseEncoding.base64Url().encode(randomBytes);
 	}
 
 	public static String normalizeMountName(String mountName) {

main/ui/src/main/java/org/cryptomator/ui/mainwindow/MainWindowController.java

@@ -23,6 +23,10 @@ import org.slf4j.LoggerFactory;
 import javax.inject.Inject;
 import javax.inject.Named;
 import java.io.File;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Collection;
+import java.util.stream.Collectors;
 
 @MainWindowScoped
 public class MainWindowController implements FxController {
@@ -89,27 +93,35 @@ public class MainWindowController implements FxController {
 			if (event.getGestureSource() != root && event.getDragboard().hasFiles()) {
 				/* allow for both copying and moving, whatever user chooses */
 				event.acceptTransferModes(TransferMode.COPY_OR_MOVE);
-				File dropped = event.getDragboard().getFiles().get(0);
-				if (dropped.getName().endsWith(".cryptomator")) {
-					addVault(dropped);
-				} else {
+				Collection<Path> vaultPaths = event.getDragboard().getFiles().stream().map(File::toPath).filter(this::isVaultPath).collect(Collectors.toSet());
+				if (vaultPaths.isEmpty()) {
 					wrongFileAlert.build().showWrongFileAlertWindow();
+				} else {
+					vaultPaths.forEach(this::addVault);
 				}
 			}
 			event.consume();
 		});
 	}
 
-	private void addVault(final File dropped) {
-		if (dropped != null) {
-			VaultSettings vaultSettings = VaultSettings.withRandomId();
-			vaultSettings.path().setValue(dropped.toPath().toAbsolutePath().getParent());
-			Vault newVault = vaultFactory.get(vaultSettings);
-			vaults.add(newVault);
-			//TODO: error handling?
+	private boolean isVaultPath(Path path) {
+		if (path.getFileName().toString().endsWith(".cryptomator")) {
+			return true;
+		} else if (Files.exists(path.resolve("masterkey.cryptomator"))) {
+			return true;
+		} else {
+			return false;
 		}
 	}
 
+	private void addVault(Path pathToVault) {
+		VaultSettings vaultSettings = VaultSettings.withRandomId();
+		vaultSettings.path().setValue(pathToVault);
+		Vault newVault = vaultFactory.get(vaultSettings);
+		vaults.add(newVault);
+		//TODO: error handling?
+	}
+
 	private void loadFont(String resourcePath) {
 		try {
 			FontLoader.load(resourcePath);