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16 package io.netty.handler.codec.http.websocketx;
17
18 import io.netty.channel.ChannelFuture;
19 import io.netty.channel.ChannelFutureListener;
20 import io.netty.channel.ChannelHandlerContext;
21 import io.netty.channel.ChannelInboundHandlerAdapter;
22 import io.netty.channel.ChannelPipeline;
23 import io.netty.channel.ChannelPromise;
24 import io.netty.handler.codec.http.HttpHeaderNames;
25 import io.netty.handler.codec.http.HttpObject;
26 import io.netty.handler.codec.http.HttpRequest;
27 import io.netty.handler.codec.http.HttpResponse;
28 import io.netty.handler.codec.http.websocketx.WebSocketServerProtocolHandler.ServerHandshakeStateEvent;
29 import io.netty.handler.ssl.SslHandler;
30 import io.netty.util.ReferenceCountUtil;
31 import io.netty.util.concurrent.Future;
32 import io.netty.util.concurrent.FutureListener;
33
34 import java.util.concurrent.TimeUnit;
35
36 import static io.netty.handler.codec.http.HttpUtil.*;
37 import static io.netty.util.internal.ObjectUtil.*;
38
39
40
41
42 class WebSocketServerProtocolHandshakeHandler extends ChannelInboundHandlerAdapter {
43
44 private final WebSocketServerProtocolConfig serverConfig;
45 private ChannelHandlerContext ctx;
46 private ChannelPromise handshakePromise;
47 private boolean isWebSocketPath;
48
49 WebSocketServerProtocolHandshakeHandler(WebSocketServerProtocolConfig serverConfig) {
50 this.serverConfig = checkNotNull(serverConfig, "serverConfig");
51 }
52
53 @Override
54 public void handlerAdded(ChannelHandlerContext ctx) {
55 this.ctx = ctx;
56 handshakePromise = ctx.newPromise();
57 }
58
59 @Override
60 public void channelRead(final ChannelHandlerContext ctx, Object msg) throws Exception {
61 final HttpObject httpObject = (HttpObject) msg;
62
63 if (httpObject instanceof HttpRequest) {
64 final HttpRequest req = (HttpRequest) httpObject;
65 isWebSocketPath = isWebSocketPath(req);
66 if (!isWebSocketPath) {
67 ctx.fireChannelRead(msg);
68 return;
69 }
70
71 try {
72 final WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
73 getWebSocketLocation(ctx.pipeline(), req, serverConfig.websocketPath()),
74 serverConfig.subprotocols(), serverConfig.decoderConfig());
75 final WebSocketServerHandshaker handshaker = wsFactory.newHandshaker(req);
76 final ChannelPromise localHandshakePromise = handshakePromise;
77 if (handshaker == null) {
78 WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
79 } else {
80
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83
84
85 WebSocketServerProtocolHandler.setHandshaker(ctx.channel(), handshaker);
86 ctx.pipeline().remove(this);
87
88 final ChannelFuture handshakeFuture = handshaker.handshake(ctx.channel(), req);
89 handshakeFuture.addListener(new ChannelFutureListener() {
90 @Override
91 public void operationComplete(ChannelFuture future) {
92 if (!future.isSuccess()) {
93 localHandshakePromise.tryFailure(future.cause());
94 ctx.fireExceptionCaught(future.cause());
95 } else {
96 localHandshakePromise.trySuccess();
97
98 ctx.fireUserEventTriggered(
99 WebSocketServerProtocolHandler.ServerHandshakeStateEvent.HANDSHAKE_COMPLETE);
100 ctx.fireUserEventTriggered(
101 new WebSocketServerProtocolHandler.HandshakeComplete(
102 req.uri(), req.headers(), handshaker.selectedSubprotocol()));
103 }
104 }
105 });
106 applyHandshakeTimeout();
107 }
108 } finally {
109 ReferenceCountUtil.release(req);
110 }
111 } else if (!isWebSocketPath) {
112 ctx.fireChannelRead(msg);
113 } else {
114 ReferenceCountUtil.release(msg);
115 }
116 }
117
118 private boolean isWebSocketPath(HttpRequest req) {
119 String websocketPath = serverConfig.websocketPath();
120 String uri = req.uri();
121 return serverConfig.checkStartsWith()
122 ? uri.startsWith(websocketPath) && ("/".equals(websocketPath) || checkNextUri(uri, websocketPath))
123 : uri.equals(websocketPath);
124 }
125
126 private boolean checkNextUri(String uri, String websocketPath) {
127 int len = websocketPath.length();
128 if (uri.length() > len) {
129 char nextUri = uri.charAt(len);
130 return nextUri == '/' || nextUri == '?';
131 }
132 return true;
133 }
134
135 private static void sendHttpResponse(ChannelHandlerContext ctx, HttpRequest req, HttpResponse res) {
136 ChannelFuture f = ctx.writeAndFlush(res);
137 if (!isKeepAlive(req) || res.status().code() != 200) {
138 f.addListener(ChannelFutureListener.CLOSE);
139 }
140 }
141
142 private static String getWebSocketLocation(ChannelPipeline cp, HttpRequest req, String path) {
143 String protocol = "ws";
144 if (cp.get(SslHandler.class) != null) {
145
146 protocol = "wss";
147 }
148 String host = req.headers().get(HttpHeaderNames.HOST);
149 return protocol + "://" + host + path;
150 }
151
152 private void applyHandshakeTimeout() {
153 final ChannelPromise localHandshakePromise = handshakePromise;
154 final long handshakeTimeoutMillis = serverConfig.handshakeTimeoutMillis();
155 if (handshakeTimeoutMillis <= 0 || localHandshakePromise.isDone()) {
156 return;
157 }
158
159 final Future<?> timeoutFuture = ctx.executor().schedule(new Runnable() {
160 @Override
161 public void run() {
162 if (!localHandshakePromise.isDone() &&
163 localHandshakePromise.tryFailure(new WebSocketServerHandshakeException("handshake timed out"))) {
164 ctx.flush()
165 .fireUserEventTriggered(ServerHandshakeStateEvent.HANDSHAKE_TIMEOUT)
166 .close();
167 }
168 }
169 }, handshakeTimeoutMillis, TimeUnit.MILLISECONDS);
170
171
172 localHandshakePromise.addListener(new FutureListener<Void>() {
173 @Override
174 public void operationComplete(Future<Void> f) {
175 timeoutFuture.cancel(false);
176 }
177 });
178 }
179 }