core/src/main/java/org/apache/ftpserver/command/impl/SITE.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.ftpserver.command.impl;

import java.io.IOException;

import org.apache.ftpserver.command.AbstractCommand;
import org.apache.ftpserver.command.Command;
import org.apache.ftpserver.ftplet.FtpException;
import org.apache.ftpserver.ftplet.FtpReply;
import org.apache.ftpserver.ftplet.FtpRequest;
import org.apache.ftpserver.impl.FtpIoSession;
import org.apache.ftpserver.impl.FtpServerContext;
import org.apache.ftpserver.impl.LocalizedFtpReply;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * <strong>Internal class, do not use directly.</strong>
 * 
 * Handle SITE command.
 *
 * @author <a href="http://mina.apache.org">Apache MINA Project</a>
 */
public class SITE extends AbstractCommand {

    private final Logger LOG = LoggerFactory.getLogger(SITE.class);

    /**
     * Execute command.
     */
    public void execute(final FtpIoSession session,
            final FtpServerContext context, final FtpRequest request)
            throws IOException, FtpException {

        // get request name
        String argument = request.getArgument();
        if (argument != null) {
            int spaceIndex = argument.indexOf(' ');
            if (spaceIndex != -1) {
                argument = argument.substring(0, spaceIndex);
            }
            argument = argument.toUpperCase();
        }

        // no params
        if (argument == null) {
            session.resetState();
            session.write(LocalizedFtpReply.translate(session, request, context,
                    FtpReply.REPLY_200_COMMAND_OKAY, "SITE", null));
            return;
        }

        // call appropriate command method
        String siteRequest = "SITE_" + argument;
        Command command = context.getCommandFactory().getCommand(siteRequest);
        try {
            if (command != null) {
                command.execute(session, context, request);
            } else {
                session.resetState();
                session.write(LocalizedFtpReply.translate(session, request, context,
                        FtpReply.REPLY_502_COMMAND_NOT_IMPLEMENTED, "SITE",
                        argument));
            }
        } catch (Exception ex) {
            LOG.warn("SITE.execute()", ex);
            session.resetState();
            session.write(LocalizedFtpReply.translate(session, request, context,
                    FtpReply.REPLY_500_SYNTAX_ERROR_COMMAND_UNRECOGNIZED,
                    "SITE", null));
        }

    }
}