org.jboss.netty.handler.codec.http.websocketx.WebSocketServerHandshaker00 Maven / Gradle / Ivy
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The Netty project is an effort to provide an asynchronous event-driven
network application framework and tools for rapid development of
maintainable high performance and high scalability protocol servers and
clients. In other words, Netty is a NIO client server framework which
enables quick and easy development of network applications such as protocol
servers and clients. It greatly simplifies and streamlines network
programming such as TCP and UDP socket server.
/*
* 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:
*
* 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 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.handler.codec.http.DefaultHttpResponse;
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.HttpResponse;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
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.*;
/**
*
* Performs server side opening and closing handshakes for web socket specification version draft-ietf-hybi-thewebsocketprotocol-
* 00
*
*
* A very large portion of this code was taken from the Netty 3.2 HTTP example.
*
*/
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);
}
/**
*
* Handle the web socket handshake for the web socket specification HyBi version 0 and lower. This standard
* is really a rehash of hixie-76 and
* hixie-75.
*
*
*
* Browser request to the server:
*
*
*
* 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
*
*
*
* Server response:
*
*
*
* 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-
*
*
* @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.headers().get(CONNECTION))
|| !WEBSOCKET.equalsIgnoreCase(req.headers().get(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.headers().contains(SEC_WEBSOCKET_KEY1) && req.headers().contains(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.headers().add(Names.UPGRADE, WEBSOCKET);
res.headers().add(CONNECTION, Values.UPGRADE);
// Fill in the headers and contents depending on handshake method.
if (isHixie76) {
// New handshake method with a challenge:
res.headers().add(SEC_WEBSOCKET_ORIGIN, req.headers().get(ORIGIN));
res.headers().add(SEC_WEBSOCKET_LOCATION, getWebSocketUrl());
String subprotocols = req.headers().get(SEC_WEBSOCKET_PROTOCOL);
if (subprotocols != null) {
String selectedSubprotocol = selectSubprotocol(subprotocols);
if (selectedSubprotocol == null) {
throw new WebSocketHandshakeException("Requested subprotocol(s) not supported: " + subprotocols);
} else {
res.headers().add(SEC_WEBSOCKET_PROTOCOL, selectedSubprotocol);
setSelectedSubprotocol(selectedSubprotocol);
}
}
// Calculate the answer of the challenge.
String key1 = req.headers().get(SEC_WEBSOCKET_KEY1);
String key2 = req.headers().get(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);
res.setContent(WebSocketUtil.md5(input));
} else {
// Old Hixie 75 handshake method with no challenge:
res.headers().add(WEBSOCKET_ORIGIN, req.headers().get(ORIGIN));
res.headers().add(WEBSOCKET_LOCATION, getWebSocketUrl());
String protocol = req.headers().get(WEBSOCKET_PROTOCOL);
if (protocol != null) {
res.headers().add(WEBSOCKET_PROTOCOL, selectSubprotocol(protocol));
}
}
return writeHandshakeResponse(
channel, res, new WebSocket00FrameEncoder(), new WebSocket00FrameDecoder(getMaxFramePayloadLength()));
}
/**
* 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);
}
}