/*
* 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.handler.codec.http.websocketx;
import static io.netty.handler.codec.http.HttpHeaders.Values.*;
import static io.netty.handler.codec.http.HttpVersion.*;
import io.netty.channel.Channel;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelPipeline;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.HttpChunkAggregator;
import io.netty.handler.codec.http.HttpHeaders.Names;
import io.netty.handler.codec.http.HttpRequest;
import io.netty.handler.codec.http.HttpRequestDecoder;
import io.netty.handler.codec.http.HttpResponse;
import io.netty.handler.codec.http.HttpResponseEncoder;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.logging.InternalLogger;
import io.netty.logging.InternalLoggerFactory;
import io.netty.util.CharsetUtil;
/**
* <p>
* Performs server side opening and closing handshakes for web socket specification version <a
* href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-10" >draft-ietf-hybi-thewebsocketprotocol-
* 10</a>
* </p>
*/
public class WebSocketServerHandshaker08 extends WebSocketServerHandshaker {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocketServerHandshaker08.class);
public static final String WEBSOCKET_08_ACCEPT_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
private final boolean allowExtensions;
/**
* 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 allowExtensions
* Allow extensions to be used in the reserved bits of the web socket frame
*/
public WebSocketServerHandshaker08(String webSocketURL, String subprotocols, boolean allowExtensions) {
super(WebSocketVersion.V08, webSocketURL, subprotocols);
this.allowExtensions = allowExtensions;
}
/**
* <p>
* Handle the web socket handshake for the web socket specification <a href=
* "http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-08">HyBi version 8 to 10</a>. Version 8, 9 and
* 10 share the same wire protocol.
* </p>
*
* <p>
* Browser request to the server:
* </p>
*
* <pre>
* GET /chat HTTP/1.1
* Host: server.example.com
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Key: dGhlIHNhbXBsZSBub25jZQ==
* Sec-WebSocket-Origin: http://example.com
* Sec-WebSocket-Protocol: chat, superchat
* Sec-WebSocket-Version: 8
* </pre>
*
* <p>
* Server response:
* </p>
*
* <pre>
* HTTP/1.1 101 Switching Protocols
* Upgrade: websocket
* Connection: Upgrade
* Sec-WebSocket-Accept: s3pPLMBiTxaQ9kYGzzhZRbK+xOo=
* Sec-WebSocket-Protocol: chat
* </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 8 server handshake", channel.getId()));
}
HttpResponse res = new DefaultHttpResponse(HTTP_1_1, HttpResponseStatus.SWITCHING_PROTOCOLS);
String key = req.getHeader(Names.SEC_WEBSOCKET_KEY);
if (key == null) {
throw new WebSocketHandshakeException("not a WebSocket request: missing key");
}
String acceptSeed = key + WEBSOCKET_08_ACCEPT_GUID;
byte[] sha1 = WebSocketUtil.sha1(acceptSeed.getBytes(CharsetUtil.US_ASCII));
String accept = WebSocketUtil.base64(sha1);
if (logger.isDebugEnabled()) {
logger.debug(String.format("WS Version 8 Server Handshake key: %s. Response: %s.", key, accept));
}
res.setStatus(HttpResponseStatus.SWITCHING_PROTOCOLS);
res.addHeader(Names.UPGRADE, WEBSOCKET.toLowerCase());
res.addHeader(Names.CONNECTION, Names.UPGRADE);
res.addHeader(Names.SEC_WEBSOCKET_ACCEPT, accept);
String protocol = req.getHeader(Names.SEC_WEBSOCKET_PROTOCOL);
if (protocol != null) {
res.addHeader(Names.SEC_WEBSOCKET_PROTOCOL, selectSubprotocol(protocol));
}
ChannelFuture future = channel.write(res);
// 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 WebSocket08FrameDecoder(true, allowExtensions));
p.replace(HttpResponseEncoder.class, "wsencoder", new WebSocket08FrameEncoder(false));
return future;
}
/**
* Echo back the closing frame and close the connection
*
* @param channel
* Channel
* @param frame
* Web Socket frame that was received
*/
@Override
public ChannelFuture close(Channel channel, CloseWebSocketFrame frame) {
ChannelFuture f = channel.write(frame);
f.addListener(ChannelFutureListener.CLOSE);
return f;
}
}