/*
* 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 io.netty.handler.codec.http.websocketx;
import io.netty.channel.ChannelInboundByteHandler;
import io.netty.channel.ChannelOutboundMessageHandler;
import io.netty.handler.codec.http.DefaultFullHttpRequest;
import io.netty.handler.codec.http.FullHttpRequest;
import io.netty.handler.codec.http.FullHttpResponse;
import io.netty.handler.codec.http.HttpHeaders;
import io.netty.handler.codec.http.HttpHeaders.Names;
import io.netty.handler.codec.http.HttpHeaders.Values;
import io.netty.handler.codec.http.HttpMethod;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import io.netty.util.CharsetUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.net.URI;
/**
* <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-
* 10</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, HttpHeaders customHeaders, int 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>
*
*/
@Override
protected FullHttpRequest newHandshakeRequest() {
// Get path
URI wsURL = uri();
String path = wsURL.getPath();
if (wsURL.getQuery() != null && !wsURL.getQuery().isEmpty()) {
path = wsURL.getPath() + '?' + wsURL.getQuery();
}
if (path == null || path.isEmpty()) {
path = "/";
}
// Get 16 bit nonce and base 64 encode it
byte[] nonce = WebSocketUtil.randomBytes(16);
String key = WebSocketUtil.base64(nonce);
String acceptSeed = key + MAGIC_GUID;
byte[] sha1 = WebSocketUtil.sha1(acceptSeed.getBytes(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
FullHttpRequest request = new DefaultFullHttpRequest(HttpVersion.HTTP_1_1, HttpMethod.GET, path);
HttpHeaders headers = request.headers();
headers.add(Names.UPGRADE, Values.WEBSOCKET.toLowerCase())
.add(Names.CONNECTION, Values.UPGRADE)
.add(Names.SEC_WEBSOCKET_KEY, key)
.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;
}
headers.add(Names.SEC_WEBSOCKET_ORIGIN, originValue);
String expectedSubprotocol = expectedSubprotocol();
if (expectedSubprotocol != null && !expectedSubprotocol.isEmpty()) {
headers.add(Names.SEC_WEBSOCKET_PROTOCOL, expectedSubprotocol);
}
headers.add(Names.SEC_WEBSOCKET_VERSION, "7");
if (customHeaders != null) {
headers.add(customHeaders);
}
return request;
}
/**
* <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 response
* HTTP response returned from the server for the request sent by beginOpeningHandshake00().
* @throws WebSocketHandshakeException
*/
@Override
protected void verify(FullHttpResponse response) {
final HttpResponseStatus status = HttpResponseStatus.SWITCHING_PROTOCOLS;
final HttpHeaders headers = response.headers();
if (!response.getStatus().equals(status)) {
throw new WebSocketHandshakeException("Invalid handshake response getStatus: " + response.getStatus());
}
String upgrade = headers.get(Names.UPGRADE);
if (!Values.WEBSOCKET.equalsIgnoreCase(upgrade)) {
throw new WebSocketHandshakeException("Invalid handshake response upgrade: " + upgrade);
}
String connection = headers.get(Names.CONNECTION);
if (!Values.UPGRADE.equalsIgnoreCase(connection)) {
throw new WebSocketHandshakeException("Invalid handshake response connection: " + connection);
}
String accept = 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));
}
}
@Override
protected ChannelInboundByteHandler newWebsocketDecoder() {
return new WebSocket07FrameDecoder(false, allowExtensions, maxFramePayloadLength());
}
@Override
protected ChannelOutboundMessageHandler<WebSocketFrame> newWebSocketEncoder() {
return new WebSocket07FrameEncoder(true);
}
}