/*
    * Copyright 2014 The Netty Project
    *
    * The Netty Project licenses this file to you under the Apache License,
    * version 2.0 (the "License"); you may not use this file except in compliance
    * with the License. You may obtain a copy of the License at:
    *
    *   https://www.apache.org/licenses/LICENSE-2.0
    *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
   * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
   * License for the specific language governing permissions and limitations
   * under the License.
   */
  package io.netty.example.spdy.server;
  
  import io.netty.bootstrap.ServerBootstrap;
  import io.netty.channel.Channel;
  import io.netty.channel.ChannelOption;
  import io.netty.channel.EventLoopGroup;
  import io.netty.channel.MultiThreadIoEventLoopGroup;
  import io.netty.channel.nio.NioIoHandler;
  import io.netty.channel.socket.nio.NioServerSocketChannel;
  import io.netty.handler.logging.LogLevel;
  import io.netty.handler.logging.LoggingHandler;
  import io.netty.handler.ssl.ApplicationProtocolConfig;
  import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectedListenerFailureBehavior;
  import io.netty.handler.ssl.ApplicationProtocolConfig.SelectorFailureBehavior;
  import io.netty.handler.ssl.ApplicationProtocolNames;
  import io.netty.handler.ssl.SslContext;
  import io.netty.handler.ssl.SslContextBuilder;
  import io.netty.handler.ssl.util.SelfSignedCertificate;
  
  /**
   * A SPDY Server that responds to a GET request with a Hello World.
   * <p>
   * This class must be run with the JVM parameter: {@code java -Xbootclasspath/p:<path_to_npn_boot_jar> ...}.
   * The "path_to_npn_boot_jar" is the path on the file system for the NPN Boot Jar file which can be downloaded from
   * Maven at coordinates org.mortbay.jetty.npn:npn-boot. Different versions applies to different OpenJDK versions.
   * See <a href="https://www.eclipse.org/jetty/documentation/current/npn-chapter.html">Jetty docs</a> for more
   * information.
   * <p>
   * You may also use the {@code run-example.sh} script to start the server from the command line:
   * <pre>
   *     ./run-example.sh spdy-server
   * </pre>
   * <p>
   * Once started, you can test the server with your
   * <a href="https://en.wikipedia.org/wiki/SPDY#Browser_support_and_usage">SPDY enabled web browser</a> by navigating
   * to <a href="https://localhost:8443/">https://localhost:8443/</a>
   */
  public final class SpdyServer {
  
      static final int PORT = Integer.parseInt(System.getProperty("port", "8443"));
  
      public static void main(String[] args) throws Exception {
          // Configure SSL.
          SelfSignedCertificate ssc = new SelfSignedCertificate();
          SslContext sslCtx = SslContextBuilder.forServer(ssc.certificate(), ssc.privateKey())
              .applicationProtocolConfig(new ApplicationProtocolConfig(
                          Protocol.NPN,
                          // NO_ADVERTISE is currently the only mode supported by both OpenSsl and JDK providers.
                          SelectorFailureBehavior.NO_ADVERTISE,
                          // ACCEPT is currently the only mode supported by both OpenSsl and JDK providers.
                          SelectedListenerFailureBehavior.ACCEPT,
                          ApplicationProtocolNames.SPDY_3_1,
                          ApplicationProtocolNames.HTTP_1_1))
              .build();
  
          // Configure the server.
          EventLoopGroup bossGroup = new MultiThreadIoEventLoopGroup(1, NioIoHandler.newFactory());
          EventLoopGroup workerGroup = new MultiThreadIoEventLoopGroup(NioIoHandler.newFactory());
          try {
              ServerBootstrap b = new ServerBootstrap();
              b.option(ChannelOption.SO_BACKLOG, 1024);
              b.group(bossGroup, workerGroup)
               .channel(NioServerSocketChannel.class)
               .handler(new LoggingHandler(LogLevel.INFO))
               .childHandler(new SpdyServerInitializer(sslCtx));
  
              Channel ch = b.bind(PORT).sync().channel();
  
              System.err.println("Open your SPDY-enabled web browser and navigate to https://127.0.0.1:" + PORT + '/');
              System.err.println("If using Chrome browser, check your SPDY sessions at chrome://net-internals/#spdy");
  
              ch.closeFuture().sync();
          } finally {
              bossGroup.shutdownGracefully();
              workerGroup.shutdownGracefully();
          }
      }
  }