/*

  * Copyright 2007 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.stub.command;

 import org.mockftpserver.core.command.Command;

 import org.mockftpserver.core.command.CommandHandler;

 import org.mockftpserver.core.command.InvocationRecord;

 import org.mockftpserver.core.command.ReplyCodes;

 import org.mockftpserver.core.session.Session;

 import org.mockftpserver.core.util.Assert;

 import org.mockftpserver.core.util.PortParser;

 import java.io.IOException;

 import java.net.InetAddress;

 /**

  * CommandHandler for the PASV (Passove Mode) command. Request the Session to switch to passive

  * data connection mode. Return a reply code of 227, along with response text of the form:

  * "<i>Entering Passive Mode. (h1,h2,h3,h4,p1,p2)</i>", where <i>h1..h4</i> are the 4

  * bytes of the 32-bit internet host address of the server, and <i>p1..p2</i> are the 2

  * bytes of the 16-bit TCP port address of the data connection on the server to which

  * the client must connect. See RFC959 for more information.

  * <p/>

  * Each invocation record stored by this CommandHandler contains no data elements.

  *

  * @author Chris Mair

  * @version $Revision: 194 $ - $Date: 2008-12-07 08:53:58 -0500 (Sun, 07 Dec 2008) $

  */

 public class PasvCommandHandler extends AbstractStubCommandHandler implements CommandHandler {

     /**

      * Constructor. Initialize the replyCode.

      */

     public PasvCommandHandler() {

         setReplyCode(ReplyCodes.PASV_OK);

     }

     /**

      * @throws IOException

      * @see org.mockftpserver.core.command.CommandHandler#handleCommand(org.mockftpserver.core.command.Command, org.mockftpserver.core.session.Session)

      */

     public void handleCommand(Command command, Session session, InvocationRecord invocationRecord)

             throws IOException {

         int port = session.switchToPassiveMode();

         InetAddress server = session.getServerHost();

         Assert.isTrue(port > -1, "The server-side port is invalid: " + port);

         LOG.debug("server=" + server + " port=" + port);

         String hostAndPort = "(" + PortParser.convertHostAndPortToCommaDelimitedBytes(server, port) + ")";

         sendReply(session, hostAndPort);

     }

 }