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1   /*
2    * Copyright 2014 The Netty Project
3    *
4    * The Netty Project licenses this file to you under the Apache License,
5    * version 2.0 (the "License"); you may not use this file except in compliance
6    * with the License. You may obtain a copy of the License at:
7    *
8    *   http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
12   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
13   * License for the specific language governing permissions and limitations
14   * under the License.
15   */
16  package io.netty.example.http.websocketx.benchmarkserver;
17  
18  import io.netty.buffer.ByteBuf;
19  import io.netty.buffer.Unpooled;
20  import io.netty.channel.ChannelFuture;
21  import io.netty.channel.ChannelFutureListener;
22  import io.netty.channel.ChannelHandlerContext;
23  import io.netty.channel.SimpleChannelInboundHandler;
24  import io.netty.handler.codec.http.DefaultFullHttpResponse;
25  import io.netty.handler.codec.http.FullHttpRequest;
26  import io.netty.handler.codec.http.FullHttpResponse;
27  import io.netty.handler.codec.http.HttpHeaders;
28  import io.netty.handler.codec.http.websocketx.BinaryWebSocketFrame;
29  import io.netty.handler.codec.http.websocketx.CloseWebSocketFrame;
30  import io.netty.handler.codec.http.websocketx.PingWebSocketFrame;
31  import io.netty.handler.codec.http.websocketx.PongWebSocketFrame;
32  import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;
33  import io.netty.handler.codec.http.websocketx.WebSocketFrame;
34  import io.netty.handler.codec.http.websocketx.WebSocketServerHandshaker;
35  import io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory;
36  import io.netty.util.CharsetUtil;
37  
38  import static io.netty.handler.codec.http.HttpHeaders.Names.*;
39  import static io.netty.handler.codec.http.HttpMethod.*;
40  import static io.netty.handler.codec.http.HttpResponseStatus.*;
41  import static io.netty.handler.codec.http.HttpVersion.*;
42  
43  /**
44   * Handles handshakes and messages
45   */
46  public class WebSocketServerHandler extends SimpleChannelInboundHandler<Object> {
47  
48      private static final String WEBSOCKET_PATH = "/websocket";
49  
50      private WebSocketServerHandshaker handshaker;
51  
52      @Override
53      public void channelRead0(ChannelHandlerContext ctx, Object msg) {
54          if (msg instanceof FullHttpRequest) {
55              handleHttpRequest(ctx, (FullHttpRequest) msg);
56          } else if (msg instanceof WebSocketFrame) {
57              handleWebSocketFrame(ctx, (WebSocketFrame) msg);
58          }
59      }
60  
61      @Override
62      public void channelReadComplete(ChannelHandlerContext ctx) {
63          ctx.flush();
64      }
65  
66      private void handleHttpRequest(ChannelHandlerContext ctx, FullHttpRequest req) {
67          // Handle a bad request.
68          if (!req.getDecoderResult().isSuccess()) {
69              sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, BAD_REQUEST));
70              return;
71          }
72  
73          // Allow only GET methods.
74          if (req.getMethod() != GET) {
75              sendHttpResponse(ctx, req, new DefaultFullHttpResponse(HTTP_1_1, FORBIDDEN));
76              return;
77          }
78  
79          // Send the demo page and favicon.ico
80          if ("/".equals(req.getUri())) {
81              ByteBuf content = WebSocketServerBenchmarkPage.getContent(getWebSocketLocation(req));
82              FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, OK, content);
83  
84              res.headers().set(CONTENT_TYPE, "text/html; charset=UTF-8");
85              HttpHeaders.setContentLength(res, content.readableBytes());
86  
87              sendHttpResponse(ctx, req, res);
88              return;
89          }
90          if ("/favicon.ico".equals(req.getUri())) {
91              FullHttpResponse res = new DefaultFullHttpResponse(HTTP_1_1, NOT_FOUND);
92              sendHttpResponse(ctx, req, res);
93              return;
94          }
95  
96          // Handshake
97          WebSocketServerHandshakerFactory wsFactory = new WebSocketServerHandshakerFactory(
98                  getWebSocketLocation(req), null, true, 5 * 1024 * 1024);
99          handshaker = wsFactory.newHandshaker(req);
100         if (handshaker == null) {
101             WebSocketServerHandshakerFactory.sendUnsupportedVersionResponse(ctx.channel());
102         } else {
103             handshaker.handshake(ctx.channel(), req);
104         }
105     }
106 
107     private void handleWebSocketFrame(ChannelHandlerContext ctx, WebSocketFrame frame) {
108 
109         // Check for closing frame
110         if (frame instanceof CloseWebSocketFrame) {
111             handshaker.close(ctx.channel(), (CloseWebSocketFrame) frame.retain());
112             return;
113         }
114         if (frame instanceof PingWebSocketFrame) {
115             ctx.write(new PongWebSocketFrame(frame.content().retain()));
116             return;
117         }
118         if (frame instanceof TextWebSocketFrame) {
119             // Echo the frame
120             ctx.write(frame.retain());
121             return;
122         }
123         if (frame instanceof BinaryWebSocketFrame) {
124             // Echo the frame
125             ctx.write(frame.retain());
126         }
127     }
128 
129     private static void sendHttpResponse(
130             ChannelHandlerContext ctx, FullHttpRequest req, FullHttpResponse res) {
131         // Generate an error page if response getStatus code is not OK (200).
132         if (res.getStatus().code() != 200) {
133             ByteBuf buf = Unpooled.copiedBuffer(res.getStatus().toString(), CharsetUtil.UTF_8);
134             res.content().writeBytes(buf);
135             buf.release();
136             HttpHeaders.setContentLength(res, res.content().readableBytes());
137         }
138 
139         // Send the response and close the connection if necessary.
140         ChannelFuture f = ctx.channel().writeAndFlush(res);
141         if (!HttpHeaders.isKeepAlive(req) || res.getStatus().code() != 200) {
142             f.addListener(ChannelFutureListener.CLOSE);
143         }
144     }
145 
146     @Override
147     public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) {
148         cause.printStackTrace();
149         ctx.close();
150     }
151 
152     private static String getWebSocketLocation(FullHttpRequest req) {
153         String location =  req.headers().get(HOST) + WEBSOCKET_PATH;
154         if (WebSocketServer.SSL) {
155             return "wss://" + location;
156         } else {
157             return "ws://" + location;
158         }
159     }
160 }