/*
* 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 org.jboss.netty.handler.codec.http.websocketx;
import static org.jboss.netty.handler.codec.http.HttpHeaders.Names.*;
import static org.jboss.netty.handler.codec.http.HttpHeaders.Values.*;
import static org.jboss.netty.handler.codec.http.HttpVersion.*;
import org.jboss.netty.buffer.ChannelBuffer;
import org.jboss.netty.buffer.ChannelBuffers;
import org.jboss.netty.channel.Channel;
import org.jboss.netty.channel.ChannelFuture;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.handler.codec.http.DefaultHttpResponse;
import org.jboss.netty.handler.codec.http.HttpChunkAggregator;
import org.jboss.netty.handler.codec.http.HttpHeaders.Names;
import org.jboss.netty.handler.codec.http.HttpHeaders.Values;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpRequestDecoder;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.jboss.netty.handler.codec.http.HttpResponseEncoder;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
/**
* <p>
* Performs server side opening and closing handshakes for web socket specification version <a
* href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-00" >draft-ietf-hybi-thewebsocketprotocol-
* 00</a>
* </p>
* <p>
* A very large portion of this code was taken from the Netty 3.2 HTTP example.
* </p>
*/
public class WebSocketServerHandshaker00 extends WebSocketServerHandshaker {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocketServerHandshaker00.class);
/**
* Constructor with default values
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param subprotocols
* CSV of supported protocols
*/
public WebSocketServerHandshaker00(String webSocketURL, String subprotocols) {
this(webSocketURL, subprotocols, Long.MAX_VALUE);
}
/**
* Constructor specifying the destination web socket location
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param subprotocols
* CSV of supported protocols
* @param maxFramePayloadLength
* Maximum allowable frame payload length. Setting this value to your application's requirement may
* reduce denial of service attacks using long data frames.
*/
public WebSocketServerHandshaker00(String webSocketURL, String subprotocols, long maxFramePayloadLength) {
super(WebSocketVersion.V00, webSocketURL, subprotocols, maxFramePayloadLength);
}
/**
* <p>
* Handle the web socket handshake for the web socket specification <a href=
* "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-00">HyBi version 0</a> and lower. This standard
* is really a rehash of <a href="http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76" >hixie-76</a> and
* <a href="http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75" >hixie-75</a>.
* </p>
*
* <p>
* Browser request to the server:
* </p>
*
* <pre>
* GET /demo HTTP/1.1
* Upgrade: WebSocket
* Connection: Upgrade
* Host: example.com
* Origin: http://example.com
* Sec-WebSocket-Protocol: chat, sample
* Sec-WebSocket-Key1: 4 @1 46546xW%0l 1 5
* Sec-WebSocket-Key2: 12998 5 Y3 1 .P00
*
* ^n:ds[4U
* </pre>
*
* <p>
* Server response:
* </p>
*
* <pre>
* HTTP/1.1 101 WebSocket Protocol Handshake
* Upgrade: WebSocket
* Connection: Upgrade
* Sec-WebSocket-Origin: http://example.com
* Sec-WebSocket-Location: ws://example.com/demo
* Sec-WebSocket-Protocol: sample
*
* 8jKS'y:G*Co,Wxa-
* </pre>
*
* @param channel
* Channel
* @param req
* HTTP request
*/
@Override
public ChannelFuture handshake(Channel channel, HttpRequest req) {
if (logger.isDebugEnabled()) {
logger.debug(String.format("Channel %s WS Version 00 server handshake", channel.getId()));
}
// Serve the WebSocket handshake request.
if (!Values.UPGRADE.equalsIgnoreCase(req.getHeader(CONNECTION))
|| !WEBSOCKET.equalsIgnoreCase(req.getHeader(Names.UPGRADE))) {
throw new WebSocketHandshakeException("not a WebSocket handshake request: missing upgrade");
}
// Hixie 75 does not contain these headers while Hixie 76 does
boolean isHixie76 = req.containsHeader(SEC_WEBSOCKET_KEY1) && req.containsHeader(SEC_WEBSOCKET_KEY2);
// Create the WebSocket handshake response.
HttpResponse res = new DefaultHttpResponse(HTTP_1_1, new HttpResponseStatus(101,
isHixie76 ? "WebSocket Protocol Handshake" : "Web Socket Protocol Handshake"));
res.addHeader(Names.UPGRADE, WEBSOCKET);
res.addHeader(CONNECTION, Values.UPGRADE);
// Fill in the headers and contents depending on handshake method.
if (isHixie76) {
// New handshake method with a challenge:
res.addHeader(SEC_WEBSOCKET_ORIGIN, req.getHeader(ORIGIN));
res.addHeader(SEC_WEBSOCKET_LOCATION, getWebSocketUrl());
String protocol = req.getHeader(SEC_WEBSOCKET_PROTOCOL);
if (protocol != null) {
res.addHeader(SEC_WEBSOCKET_PROTOCOL, selectSubprotocol(protocol));
}
// Calculate the answer of the challenge.
String key1 = req.getHeader(SEC_WEBSOCKET_KEY1);
String key2 = req.getHeader(SEC_WEBSOCKET_KEY2);
int a = (int) (Long.parseLong(key1.replaceAll("[^0-9]", "")) / key1.replaceAll("[^ ]", "").length());
int b = (int) (Long.parseLong(key2.replaceAll("[^0-9]", "")) / key2.replaceAll("[^ ]", "").length());
long c = req.getContent().readLong();
ChannelBuffer input = ChannelBuffers.buffer(16);
input.writeInt(a);
input.writeInt(b);
input.writeLong(c);
ChannelBuffer output = ChannelBuffers.wrappedBuffer(WebSocketUtil.md5(input.array()));
res.setContent(output);
} else {
// Old Hixie 75 handshake method with no challenge:
res.addHeader(WEBSOCKET_ORIGIN, req.getHeader(ORIGIN));
res.addHeader(WEBSOCKET_LOCATION, getWebSocketUrl());
String protocol = req.getHeader(WEBSOCKET_PROTOCOL);
if (protocol != null) {
res.addHeader(WEBSOCKET_PROTOCOL, selectSubprotocol(protocol));
}
}
// Upgrade the connection and send the handshake response.
ChannelPipeline p = channel.getPipeline();
if (p.get(HttpChunkAggregator.class) != null) {
p.remove(HttpChunkAggregator.class);
}
p.replace(HttpRequestDecoder.class, "wsdecoder",
new WebSocket00FrameDecoder(this.getMaxFramePayloadLength()));
ChannelFuture future = channel.write(res);
p.replace(HttpResponseEncoder.class, "wsencoder", new WebSocket00FrameEncoder());
return future;
}
/**
* Echo back the closing frame
*
* @param channel
* Channel
* @param frame
* Web Socket frame that was received
*/
@Override
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame) {
return channel.write(frame);
}
}