/*
* 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.channel.ChannelFutureListener;
import org.jboss.netty.channel.ChannelPipeline;
import org.jboss.netty.channel.DefaultChannelFuture;
import org.jboss.netty.handler.codec.http.DefaultHttpRequest;
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.HttpMethod;
import org.jboss.netty.handler.codec.http.HttpRequest;
import org.jboss.netty.handler.codec.http.HttpRequestEncoder;
import org.jboss.netty.handler.codec.http.HttpResponse;
import org.jboss.netty.handler.codec.http.HttpResponseDecoder;
import org.jboss.netty.handler.codec.http.HttpResponseStatus;
import org.jboss.netty.handler.codec.http.HttpVersion;
import org.jboss.netty.logging.InternalLogger;
import org.jboss.netty.logging.InternalLoggerFactory;
import org.jboss.netty.util.CharsetUtil;
import java.net.URI;
import java.util.Map;
/**
* <p>
* Performs client side opening and closing handshakes for web socket specification version <a
* href="http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-07" >draft-ietf-hybi-thewebsocketprotocol-
* 07</a>
* </p>
*/
public class WebSocketClientHandshaker07 extends WebSocketClientHandshaker {
private static final InternalLogger logger = InternalLoggerFactory.getInstance(WebSocketClientHandshaker07.class);
public static final String MAGIC_GUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
private String expectedChallengeResponseString;
private final boolean allowExtensions;
/**
* Creates a new instance.
*
* @param webSocketURL
* URL for web socket communications. e.g "ws://myhost.com/mypath". Subsequent web socket frames will be
* sent to this URL.
* @param version
* Version of web socket specification to use to connect to the server
* @param subprotocol
* Sub protocol request sent to the server.
* @param allowExtensions
* Allow extensions to be used in the reserved bits of the web socket frame
* @param customHeaders
* Map of custom headers to add to the client request
* @param maxFramePayloadLength
* Maximum length of a frame's payload
*/
public WebSocketClientHandshaker07(URI webSocketURL, WebSocketVersion version, String subprotocol,
boolean allowExtensions, Map<String, String> customHeaders,
long maxFramePayloadLength) {
super(webSocketURL, version, subprotocol, customHeaders, maxFramePayloadLength);
this.allowExtensions = allowExtensions;
}
/**
* /**
* <p>
* Sends the opening 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: 7
* </pre>
*
* @param channel
* Channel into which we can write our request
*/
@Override
public ChannelFuture handshake(Channel channel) {
// Get path
URI wsURL = getWebSocketUrl();
String path = wsURL.getPath();
if (wsURL.getQuery() != null && wsURL.getQuery().length() > 0) {
path = wsURL.getPath() + '?' + wsURL.getQuery();
}
if (path == null || path.length() == 0) {
path = "/";
}
// Get 16 bit nonce and base 64 encode it
byte[] nonce = WebSocketUtil.randomBytes(16);
String key = WebSocketUtil.base64(ChannelBuffers.wrappedBuffer(nonce));
String acceptSeed = key + MAGIC_GUID;
ChannelBuffer sha1 = WebSocketUtil.sha1(ChannelBuffers.copiedBuffer(acceptSeed, CharsetUtil.US_ASCII));
expectedChallengeResponseString = WebSocketUtil.base64(sha1);
if (logger.isDebugEnabled()) {
logger.debug(String.format("WS Version 07 Client Handshake key: %s. Expected response: %s.", key,
expectedChallengeResponseString));
}
// Format request
HttpRequest request = new DefaultHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
request.headers().add(Names.UPGRADE, Values.WEBSOCKET.toLowerCase());
request.headers().add(Names.CONNECTION, Values.UPGRADE);
request.headers().add(Names.SEC_WEBSOCKET_KEY, key);
request.headers().add(Names.HOST, wsURL.getHost());
int wsPort = wsURL.getPort();
String originValue = "http://" + wsURL.getHost();
if (wsPort != 80 && wsPort != 443) {
// if the port is not standard (80/443) its needed to add the port to the header.
// See http://tools.ietf.org/html/rfc6454#section-6.2
originValue = originValue + ':' + wsPort;
}
request.headers().add(Names.SEC_WEBSOCKET_ORIGIN, originValue);
String expectedSubprotocol = getExpectedSubprotocol();
if (expectedSubprotocol != null && expectedSubprotocol.length() > 0) {
request.headers().add(Names.SEC_WEBSOCKET_PROTOCOL, expectedSubprotocol);
}
request.headers().add(Names.SEC_WEBSOCKET_VERSION, "7");
if (customHeaders != null) {
for (Map.Entry<String, String> e : customHeaders.entrySet()) {
request.headers().add(e.getKey(), e.getValue());
}
}
final ChannelFuture handshakeFuture = new DefaultChannelFuture(channel, false);
ChannelFuture future = channel.write(request);
future.addListener(new ChannelFutureListener() {
public void operationComplete(ChannelFuture future) {
ChannelPipeline p = future.getChannel().getPipeline();
p.addAfter(
p.getContext(HttpRequestEncoder.class).getName(),
"ws-encoder", new WebSocket07FrameEncoder(true));
if (future.isSuccess()) {
handshakeFuture.setSuccess();
} else {
handshakeFuture.setFailure(future.getCause());
}
}
});
return handshakeFuture;
}
/**
* <p>
* Process 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 response
* HTTP response returned from the server for the request sent by beginOpeningHandshake00().
* @throws WebSocketHandshakeException
*/
@Override
public void finishHandshake(Channel channel, HttpResponse response) {
final HttpResponseStatus status = HttpResponseStatus.SWITCHING_PROTOCOLS;
if (!response.getStatus().equals(status)) {
throw new WebSocketHandshakeException("Invalid handshake response status: " + response.getStatus());
}
String upgrade = response.headers().get(Names.UPGRADE);
if (!Values.WEBSOCKET.equalsIgnoreCase(upgrade)) {
throw new WebSocketHandshakeException("Invalid handshake response upgrade: "
+ response.headers().get(Names.UPGRADE));
}
String connection = response.headers().get(Names.CONNECTION);
if (!Values.UPGRADE.equalsIgnoreCase(connection)) {
throw new WebSocketHandshakeException("Invalid handshake response connection: "
+ response.headers().get(Names.CONNECTION));
}
String accept = response.headers().get(Names.SEC_WEBSOCKET_ACCEPT);
if (accept == null || !accept.equals(expectedChallengeResponseString)) {
throw new WebSocketHandshakeException(String.format("Invalid challenge. Actual: %s. Expected: %s", accept,
expectedChallengeResponseString));
}
String subprotocol = response.headers().get(Names.SEC_WEBSOCKET_PROTOCOL);
setActualSubprotocol(subprotocol);
setHandshakeComplete();
ChannelPipeline p = channel.getPipeline();
p.get(HttpResponseDecoder.class).replace(
"ws-decoder",
new WebSocket07FrameDecoder(false, allowExtensions, getMaxFramePayloadLength()));
}
}