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   /*
    * Copyright 2012 The Netty Project
    *
    * The Netty Project 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:
    *
    *   https://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 io.netty.example.securechat;
  
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelHandlerContext;
  import io.netty.channel.SimpleChannelInboundHandler;
  import io.netty.channel.group.ChannelGroup;
  import io.netty.channel.group.DefaultChannelGroup;
  import io.netty.handler.ssl.SslHandler;
  import io.netty.util.concurrent.Future;
  import io.netty.util.concurrent.GenericFutureListener;
  import io.netty.util.concurrent.GlobalEventExecutor;
  
  import java.net.InetAddress;
  
  /**
   * Handles a server-side channel.
   */
  public class SecureChatServerHandler extends SimpleChannelInboundHandler<String> {
  
      static final ChannelGroup channels = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);
  
      @Override
      public void channelActive(final ChannelHandlerContext ctx) {
          // Once session is secured, send a greeting and register the channel to the global channel
          // list so the channel received the messages from others.
          ctx.pipeline().get(SslHandler.class).handshakeFuture().addListener(
                  new GenericFutureListener<Future<Channel>>() {
                      @Override
                      public void operationComplete(Future<Channel> future) throws Exception {
                          ctx.writeAndFlush(
                                  "Welcome to " + InetAddress.getLocalHost().getHostName() + " secure chat service!\n");
                          ctx.writeAndFlush(
                                  "Your session is protected by " +
                                          ctx.pipeline().get(SslHandler.class).engine().getSession().getCipherSuite() +
                                          " cipher suite.\n");
  
                          channels.add(ctx.channel());
                      }
          });
      }
  
      @Override
      public void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
          // Send the received message to all channels but the current one.
          for (Channel c: channels) {
              if (c != ctx.channel()) {
                  c.writeAndFlush("[" + ctx.channel().remoteAddress() + "] " + msg + '\n');
              } else {
                  c.writeAndFlush("[you] " + msg + '\n');
              }
          }
  
          // Close the connection if the client has sent 'bye'.
          if ("bye".equals(msg.toLowerCase())) {
              ctx.close();
          }
      }
  
      @Override
      public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          cause.printStackTrace();
          ctx.close();
      }
  }