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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    *   https://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.MultiThreadIoEventLoopGroup;
24  import io.netty.channel.nio.NioIoHandler;
25  import io.netty.channel.socket.nio.NioServerSocketChannel;
26  import io.netty.handler.codec.http2.Http2SecurityUtil;
27  import io.netty.handler.logging.LogLevel;
28  import io.netty.handler.logging.LoggingHandler;
29  import io.netty.handler.ssl.ApplicationProtocolConfig;
30  import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
31  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
32  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
33  import io.netty.handler.ssl.ApplicationProtocolNames;
34  import io.netty.handler.ssl.OpenSsl;
35  import io.netty.handler.ssl.SslContext;
36  import io.netty.handler.ssl.SslContextBuilder;
37  import io.netty.handler.ssl.SslProvider;
38  import io.netty.handler.ssl.SupportedCipherSuiteFilter;
39  import io.netty.handler.ssl.util.SelfSignedCertificate;
40  
41  /**
42   * An HTTP/2 Server that responds to requests with a Hello World. Once started, you can test the
43   * server with the example client.
44   *
45   * <p>This example is making use of the "multiplexing" http2 API, where streams are mapped to child
46   * Channels. This API is very experimental and incomplete.
47   */
48  public final class Http2Server {
49  
50      static final boolean SSL = System.getProperty("ssl") != null;
51  
52      static final int PORT = Integer.parseInt(System.getProperty("port", SSL? "8443" : "8080"));
53  
54      public static void main(String[] args) throws Exception {
55          // Configure SSL.
56          final SslContext sslCtx;
57          if (SSL) {
58              SslProvider provider = OpenSsl.isAlpnSupported() ? SslProvider.OPENSSL : SslProvider.JDK;
59              SelfSignedCertificate ssc = new SelfSignedCertificate();
60              sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey())
61                  .sslProvider(provider)
62                  /* NOTE: the cipher filter may not include all ciphers required by the HTTP/2 specification.
63                   * Please refer to the HTTP/2 specification for cipher requirements. */
64                  .ciphers(Http2SecurityUtil.CIPHERS, SupportedCipherSuiteFilter.INSTANCE)
65                  .applicationProtocolConfig(new ApplicationProtocolConfig(
66                      Protocol.ALPN,
67                      // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
68                      SelectorFailureBehavior.NO_ADVERTISE,
69                      // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
70                      SelectedListenerFailureBehavior.ACCEPT,
71                      ApplicationProtocolNames.HTTP_2,
72                      ApplicationProtocolNames.HTTP_1_1))
73                  .build();
74          } else {
75              sslCtx = null;
76          }
77          // Configure the server.
78          EventLoopGroup group = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
79          try {
80              ServerBootstrap b = new ServerBootstrap();
81              b.option(ChannelOption.SO_BACKLOG, 1024);
82              b.group(group)
83               .channel(NioServerSocketChannel.class)
84               .handler(new LoggingHandler(LogLevel.INFO))
85               .childHandler(new Http2ServerInitializer(sslCtx));
86  
87              Channel ch = b.bind(PORT).sync().channel();
88  
89              System.err.println("Open your HTTP/2-enabled web browser and navigate to " +
90                      (SSL? "https" : "http") + "://127.0.0.1:" + PORT + '/');
91  
92              ch.closeFuture().sync();
93          } finally {
94              group.shutdownGracefully();
95          }
96      }
97  }