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    1   /*
    2    * Copyright 2009 Red Hat, Inc.
    3    *
    4    * Red Hat licenses this file to you under the Apache License, version 2.0
    5    * (the "License"); you may not use this file except in compliance with the
    6    * License.  You may obtain a copy of the License at:
    7    *
    8    *    http://www.apache.org/licenses/LICENSE-2.0
    9    *
    10   * Unless required by applicable law or agreed to in writing, software
    11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
    12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
    13   * License for the specific language governing permissions and limitations
    14   * under the License.
    15   */
    16  package org.jboss.netty.example.securechat;
    17
    18  import java.net.InetAddress;
    19  import java.util.logging.Level;
    20  import java.util.logging.Logger;
    21
    22  import org.jboss.netty.channel.Channel;
    23  import org.jboss.netty.channel.ChannelEvent;
    24  import org.jboss.netty.channel.ChannelFuture;
    25  import org.jboss.netty.channel.ChannelFutureListener;
    26  import org.jboss.netty.channel.ChannelHandlerContext;
    27  import org.jboss.netty.channel.ChannelStateEvent;
    28  import org.jboss.netty.channel.ExceptionEvent;
    29  import org.jboss.netty.channel.MessageEvent;
    30  import org.jboss.netty.channel.SimpleChannelUpstreamHandler;
    31  import org.jboss.netty.channel.group.ChannelGroup;
    32  import org.jboss.netty.channel.group.DefaultChannelGroup;
    33  import org.jboss.netty.handler.ssl.SslHandler;
    34
    35  /**
    36   * Handles a server-side channel.
    37   *
    38   * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    39   * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    40   *
    41   * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
    42   */
    43  public class SecureChatServerHandler extends SimpleChannelUpstreamHandler {
    44
    45      private static final Logger logger = Logger.getLogger(
    46              SecureChatServerHandler.class.getName());
    47
    48      static final ChannelGroup channels = new DefaultChannelGroup();
    49
    50      @Override
    51      public void handleUpstream(
    52              ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
    53          if (e instanceof ChannelStateEvent) {
    54              logger.info(e.toString());
    55          }
    56          super.handleUpstream(ctx, e);
    57      }
    58
    59      @Override
    60      public void channelConnected(
    61              ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
    62
    63          // Get the SslHandler in the current pipeline.
    64          // We added it in SecureChatPipelineFactory.
    65          final SslHandler sslHandler = ctx.getPipeline().get(SslHandler.class);
    66
    67          // Get notified when SSL handshake is done.
    68          ChannelFuture handshakeFuture = sslHandler.handshake();
    69          handshakeFuture.addListener(new Greeter(sslHandler));
    70      }
    71
    72      @Override
    73      public void channelDisconnected(
    74              ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
    75          // Unregister the channel from the global channel list
    76          // so the channel does not receive messages anymore.
    77          channels.remove(e.getChannel());
    78      }
    79
    80      @Override
    81      public void messageReceived(
    82              ChannelHandlerContext ctx, MessageEvent e) {
    83
    84          // Convert to a String first.
    85          String request = (String) e.getMessage();
    86
    87          // Send the received message to all channels but the current one.
    88          for (Channel c: channels) {
    89              if (c != e.getChannel()) {
    90                  c.write("[" + e.getChannel().getRemoteAddress() + "] " +
    91                          request + '\n');
    92              } else {
    93                  c.write("[you] " + request + '\n');
    94              }
    95          }
    96
    97          // Close the connection if the client has sent 'bye'.
    98          if (request.toLowerCase().equals("bye")) {
    99              e.getChannel().close();
    100         }
    101     }
    102
    103     @Override
    104     public void exceptionCaught(
    105             ChannelHandlerContext ctx, ExceptionEvent e) {
    106         logger.log(
    107                 Level.WARNING,
    108                 "Unexpected exception from downstream.",
    109                 e.getCause());
    110         e.getChannel().close();
    111     }
    112
    113     /**
    114      * @author <a href="http://www.jboss.org/netty/">The Netty Project</a>
    115      * @author <a href="http://gleamynode.net/">Trustin Lee</a>
    116      * @version $Rev: 2121 $, $Date: 2010-02-02 09:38:07 +0900 (Tue, 02 Feb 2010) $
    117      */
    118     private static final class Greeter implements ChannelFutureListener {
    119
    120         private final SslHandler sslHandler;
    121
    122         Greeter(SslHandler sslHandler) {
    123             this.sslHandler = sslHandler;
    124         }
    125
    126         public void operationComplete(ChannelFuture future) throws Exception {
    127             if (future.isSuccess()) {
    128                 // Once session is secured, send a greeting.
    129                 future.getChannel().write(
    130                         "Welcome to " + InetAddress.getLocalHost().getHostName() +
    131                         " secure chat service!\n");
    132                 future.getChannel().write(
    133                         "Your session is protected by " +
    134                         sslHandler.getEngine().getSession().getCipherSuite() +
    135                         " cipher suite.\n");
    136
    137                 // Register the channel to the global channel list
    138                 // so the channel received the messages from others.
    139                 channels.add(future.getChannel());
    140             } else {
    141                 future.getChannel().close();
    142             }
    143         }
    144     }
    145 }