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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.spdy.server;
17  
18  import io.netty.channel.ChannelHandlerContext;
19  import io.netty.channel.ChannelPipeline;
20  import io.netty.handler.codec.http.HttpObjectAggregator;
21  import io.netty.handler.codec.http.HttpServerCodec;
22  import io.netty.handler.codec.spdy.SpdyFrameCodec;
23  import io.netty.handler.codec.spdy.SpdyHttpDecoder;
24  import io.netty.handler.codec.spdy.SpdyHttpEncoder;
25  import io.netty.handler.codec.spdy.SpdyHttpResponseStreamIdHandler;
26  import io.netty.handler.codec.spdy.SpdySessionHandler;
27  import io.netty.handler.codec.spdy.SpdyVersion;
28  import io.netty.handler.ssl.ApplicationProtocolNames;
29  import io.netty.handler.ssl.ApplicationProtocolNegotiationHandler;
30  
31  /**
32   * Negotiates with the browser if SPDY or HTTP is going to be used. Once decided, the Netty pipeline is setup with
33   * the correct handlers for the selected protocol.
34   */
35  public class SpdyOrHttpHandler extends ApplicationProtocolNegotiationHandler {
36  
37      private static final int MAX_CONTENT_LENGTH = 1024 * 100;
38  
39      protected SpdyOrHttpHandler() {
40          super(ApplicationProtocolNames.HTTP_1_1);
41      }
42  
43      @Override
44      protected void configurePipeline(ChannelHandlerContext ctx, String protocol) throws Exception {
45          if (ApplicationProtocolNames.SPDY_3_1.equals(protocol)) {
46              configureSpdy(ctx, SpdyVersion.SPDY_3_1);
47              return;
48          }
49  
50          if (ApplicationProtocolNames.HTTP_1_1.equals(protocol)) {
51              configureHttp1(ctx);
52              return;
53          }
54  
55          throw new IllegalStateException("unknown protocol: " + protocol);
56      }
57  
58      private static void configureSpdy(ChannelHandlerContext ctx, SpdyVersion version) throws Exception {
59          ChannelPipeline p = ctx.pipeline();
60          p.addLast(new SpdyFrameCodec(version));
61          p.addLast(new SpdySessionHandler(version, true));
62          p.addLast(new SpdyHttpEncoder(version));
63          p.addLast(new SpdyHttpDecoder(version, MAX_CONTENT_LENGTH));
64          p.addLast(new SpdyHttpResponseStreamIdHandler());
65          p.addLast(new SpdyServerHandler());
66      }
67  
68      private static void configureHttp1(ChannelHandlerContext ctx) throws Exception {
69          ChannelPipeline p = ctx.pipeline();
70          p.addLast(new HttpServerCodec());
71          p.addLast(new HttpObjectAggregator(MAX_CONTENT_LENGTH));
72          p.addLast(new SpdyServerHandler());
73      }
74  }