/*
    * 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.netty5.example.securechat;
  
  import io.netty5.channel.Channel;
  import io.netty5.channel.ChannelHandlerContext;
  import io.netty5.channel.SimpleChannelInboundHandler;
  import io.netty5.channel.group.ChannelGroup;
  import io.netty5.channel.group.DefaultChannelGroup;
  import io.netty5.handler.ssl.SslHandshakeCompletionEvent;
  import io.netty5.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 channelInboundEvent(ChannelHandlerContext ctx, Object evt) throws Exception {
          if (evt instanceof SslHandshakeCompletionEvent) {
              SslHandshakeCompletionEvent completionEvent = (SslHandshakeCompletionEvent) evt;
              // Once session is secured, send a greeting and register the channel to the global channel
              // list so the channel received the messages from others.
              if (completionEvent.isSuccess()) {
                  ctx.writeAndFlush(
                          "Welcome to " + InetAddress.getLocalHost().getHostName() + " secure chat service!\n");
                  ctx.writeAndFlush(
                          "Your session is protected by " +
                                  completionEvent.session().getCipherSuite() +
                                  " cipher suite.\n");
                  channels.add(ctx.channel());
              } else {
                  ctx.close();
              }
          }
          super.channelInboundEvent(ctx, evt);
      }
  
      @Override
      public void messageReceived(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 channelExceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
          cause.printStackTrace();
          ctx.close();
      }
  }