/*

  * Copyright 2008 the original author or authors.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *      http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

  * See the License for the specific language governing permissions and

  * limitations under the License.

  */

 package org.mockftpserver.fake.command;

 import org.mockftpserver.core.command.Command;

 import org.mockftpserver.core.command.ReplyCodes;

 import org.mockftpserver.core.session.Session;

 import org.mockftpserver.core.session.SessionKeys;

 /**

  * CommandHandler for the CDUP command. Handler logic:

  * <ol>

  * <li>If the user has not logged in, then reply with 530</li>

  * <li>If the current directory has no parent or if the current directory cannot be changed, then reply with 550 and terminate</li>

  * <li>If the current user does not have execute access to the parent directory, then reply with 550 and terminate</li>

  * <li>Otherwise, reply with 200 and change the current directory stored in the session to the parent directory</li>

  * </ol>

  *

  * @author Chris Mair

  * @version $Revision: 182 $ - $Date: 2008-11-30 21:37:49 -0500 (Sun, 30 Nov 2008) $

  */

 public class CdupCommandHandler extends AbstractFakeCommandHandler {

     protected void handle(Command command, Session session) {

         verifyLoggedIn(session);

         String currentDirectory = (String) getRequiredSessionAttribute(session, SessionKeys.CURRENT_DIRECTORY);

         String path = getFileSystem().getParent(currentDirectory);

         this.replyCodeForFileSystemException = ReplyCodes.READ_FILE_ERROR;

         verifyFileSystemCondition(notNullOrEmpty(path), currentDirectory, "filesystem.parentDirectoryDoesNotExist");

         verifyFileSystemCondition(getFileSystem().isDirectory(path), path, "filesystem.isNotADirectory");

         // User must have execute permission to the parent directory

         verifyExecutePermission(session, path);

         session.setAttribute(SessionKeys.CURRENT_DIRECTORY, path);

         sendReply(session, ReplyCodes.CDUP_OK, "cdup", list(path));

     }

 }