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1   /*
2    * Copyright 2016 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  
17  package io.netty.example.http2.helloworld.frame.server;
18  
19  import io.netty.bootstrap.ServerBootstrap;
20  import io.netty.channel.Channel;
21  import io.netty.channel.ChannelOption;
22  import io.netty.channel.EventLoopGroup;
23  import io.netty.channel.nio.NioEventLoopGroup;
24  import io.netty.channel.socket.nio.NioServerSocketChannel;
25  import io.netty.handler.codec.http2.Http2SecurityUtil;
26  import io.netty.handler.logging.LogLevel;
27  import io.netty.handler.logging.LoggingHandler;
28  import io.netty.handler.ssl.ApplicationProtocolConfig;
29  import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
30  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
31  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
32  import io.netty.handler.ssl.ApplicationProtocolNames;
33  import io.netty.handler.ssl.OpenSsl;
34  import io.netty.handler.ssl.SslContext;
35  import io.netty.handler.ssl.SslContextBuilder;
36  import io.netty.handler.ssl.SslProvider;
37  import io.netty.handler.ssl.SupportedCipherSuiteFilter;
38  import io.netty.handler.ssl.util.SelfSignedCertificate;
39  
40  /**
41   * A HTTP/2 Server that responds to requests with a Hello World. Once started, you can test the
42   * server with the example client.
43   *
44   * <p>This example is making use of the "multiplexing" http2 API, where streams are mapped to child
45   * Channels. This API is very experimental and incomplete.
46   */
47  public final class Http2Server {
48  
49      static final boolean SSL = System.getProperty("ssl") != null;
50  
51      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8443" : "8080"));
52  
53      public static void main(String[] args) throws Exception {
54          // Configure SSL.
55          final SslContext sslCtx;
56          if (SSL) {
57              SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
58              SelfSignedCertificate ssc = new SelfSignedCertificate();
59              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey())
60                  .sslProvider(provider)
61                  /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
62                   * Please refer to the HTTP/2 specification for cipher requirements. */
63                  .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
64                  .applicationProtocolConfig(new ApplicationProtocolConfig(
65                      Protocol.ALPN,
66                      // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
67                      SelectorFailureBehavior.NO_ADVERTISE,
68                      // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
69                      SelectedListenerFailureBehavior.ACCEPT,
70                      ApplicationProtocolNames.HTTP_2,
71                      ApplicationProtocolNames.HTTP_1_1))
72                  .build();
73          } else {
74              sslCtx = null;
75          }
76          // Configure the server.
77          EventLoopGroup group = new NioEventLoopGroup();
78          try {
79              ServerBootstrap b = new ServerBootstrap();
80              b.option(ChannelOption.SO_BACKLOG, 1024);
81              b.group(group)
82               .channel(NioServerSocketChannel.class)
83               .handler(new LoggingHandler(LogLevel.INFO))
84               .childHandler(new Http2ServerInitializer(sslCtx));
85  
86              Channel ch = b.bind(PORT).sync().channel();
87  
88              System.err.println("Open your HTTP/2-enabled web browser and navigate to " +
89                      (SSL? "https" : "http") + "://127.0.0.1:" + PORT + '/');
90  
91              ch.closeFuture().sync();
92          } finally {
93              group.shutdownGracefully();
94          }
95      }
96  }