/*
* Copyright 2011 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:
*
* 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 io.netty.example.securechat;
import java.net.InetAddress;
import java.util.logging.Level;
import java.util.logging.Logger;
import io.netty.channel.Channel;
import io.netty.channel.ChannelEvent;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelStateEvent;
import io.netty.channel.ExceptionEvent;
import io.netty.channel.MessageEvent;
import io.netty.channel.SimpleChannelUpstreamHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.handler.ssl.SslHandler;
/**
* Handles a server-side channel.
*/
public class SecureChatServerHandler extends SimpleChannelUpstreamHandler {
private static final Logger logger = Logger.getLogger(
SecureChatServerHandler.class.getName());
static final ChannelGroup channels = new DefaultChannelGroup();
@Override
public void handleUpstream(
ChannelHandlerContext ctx, ChannelEvent e) throws Exception {
if (e instanceof ChannelStateEvent) {
logger.info(e.toString());
}
super.handleUpstream(ctx, e);
}
@Override
public void channelConnected(
ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
// Get the SslHandler in the current pipeline.
// We added it in SecureChatPipelineFactory.
final SslHandler sslHandler = ctx.getPipeline().get(SslHandler.class);
// Get notified when SSL handshake is done.
ChannelFuture handshakeFuture = sslHandler.handshake();
handshakeFuture.addListener(new Greeter(sslHandler));
}
@Override
public void channelDisconnected(
ChannelHandlerContext ctx, ChannelStateEvent e) throws Exception {
// Unregister the channel from the global channel list
// so the channel does not receive messages anymore.
channels.remove(e.getChannel());
}
@Override
public void messageReceived(
ChannelHandlerContext ctx, MessageEvent e) {
// Convert to a String first.
String request = (String) e.getMessage();
// Send the received message to all channels but the current one.
for (Channel c: channels) {
if (c != e.getChannel()) {
c.write("[" + e.getChannel().getRemoteAddress() + "] " +
request + '\n');
} else {
c.write("[you] " + request + '\n');
}
}
// Close the connection if the client has sent 'bye'.
if (request.toLowerCase().equals("bye")) {
e.getChannel().close();
}
}
@Override
public void exceptionCaught(
ChannelHandlerContext ctx, ExceptionEvent e) {
logger.log(
Level.WARNING,
"Unexpected exception from downstream.",
e.getCause());
e.getChannel().close();
}
private static final class Greeter implements ChannelFutureListener {
private final SslHandler sslHandler;
Greeter(SslHandler sslHandler) {
this.sslHandler = sslHandler;
}
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
// Once session is secured, send a greeting.
future.getChannel().write(
"Welcome to " + InetAddress.getLocalHost().getHostName() +
" secure chat service!\n");
future.getChannel().write(
"Your session is protected by " +
sslHandler.getEngine().getSession().getCipherSuite() +
" cipher suite.\n");
// Register the channel to the global channel list
// so the channel received the messages from others.
channels.add(future.getChannel());
} else {
future.getChannel().close();
}
}
}
}