/*
    * Copyright 2012 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:
    *
    *   http://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 org.jboss.netty.example.http.tunnel;
  
  import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.net.InetSocketAddress;
  import java.net.URI;
  import java.util.concurrent.Executors;
  
  import org.jboss.netty.bootstrap.ClientBootstrap;
  import org.jboss.netty.channel.ChannelFuture;
  import org.jboss.netty.channel.ChannelPipeline;
  import org.jboss.netty.channel.ChannelPipelineFactory;
  import org.jboss.netty.channel.Channels;
  import org.jboss.netty.channel.socket.http.HttpTunnelingClientSocketChannelFactory;
  import org.jboss.netty.channel.socket.oio.OioClientSocketChannelFactory;
  import org.jboss.netty.example.securechat.SecureChatSslContextFactory;
  import org.jboss.netty.handler.codec.string.StringDecoder;
  import org.jboss.netty.handler.codec.string.StringEncoder;
  import org.jboss.netty.handler.logging.LoggingHandler;
  import org.jboss.netty.logging.InternalLogLevel;
  
  /**
   * An HTTP tunneled version of the telnet client example.  Please refer to the
   * API documentation of the <tt>org.jboss.netty.channel.socket.http</tt> package
   * for the detailed instruction on how to deploy the server-side HTTP tunnel in
   * your Servlet container.
   */
  public class HttpTunnelingClientExample {
  
      private final URI uri;
  
      public HttpTunnelingClientExample(URI uri) {
          this.uri = uri;
      }
  
      public void run() throws IOException {
          String scheme = uri.getScheme() == null? "http" : uri.getScheme();
  
          // Configure the client.
          ClientBootstrap b = new ClientBootstrap(
                  new HttpTunnelingClientSocketChannelFactory(
                          new OioClientSocketChannelFactory(Executors.newCachedThreadPool())));
  
          b.setPipelineFactory(new ChannelPipelineFactory() {
              public ChannelPipeline getPipeline() throws Exception {
                  return Channels.pipeline(
                          new StringDecoder(),
                          new StringEncoder(),
                          new LoggingHandler(InternalLogLevel.INFO));
              }
          });
  
          // Set additional options required by the HTTP tunneling transport.
          b.setOption("serverName", uri.getHost());
          b.setOption("serverPath", uri.getRawPath());
  
          // Configure SSL if necessary
          if (scheme.equals("https")) {
              b.setOption("sslContext", SecureChatSslContextFactory.getClientContext());
          } else if (!scheme.equals("http")) {
              // Only HTTP and HTTPS are supported.
              System.err.println("Only HTTP(S) is supported.");
              return;
          }
  
          // Make the connection attempt.
          ChannelFuture channelFuture = b.connect(
                  new InetSocketAddress(uri.getHost(), uri.getPort()));
          channelFuture.awaitUninterruptibly();
  
          // Read commands from the stdin.
          System.out.println("Enter text ('quit' to exit)");
          ChannelFuture lastWriteFuture = null;
          BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
          for (; ;) {
              String line = in.readLine();
              if (line == null || "quit".equalsIgnoreCase(line)) {
                  break;
              }
  
              // Sends the received line to the server.
              lastWriteFuture = channelFuture.getChannel().write(line);
          }
 
         // Wait until all messages are flushed before closing the channel.
         if (lastWriteFuture != null) {
             lastWriteFuture.awaitUninterruptibly();
         }
 
         channelFuture.getChannel().close();
         // Wait until the connection is closed or the connection attempt fails.
         channelFuture.getChannel().getCloseFuture().awaitUninterruptibly();
 
         // Shut down all threads.
         b.releaseExternalResources();
     }
 
     public static void main(String[] args) throws Exception {
         if (args.length != 1) {
             System.err.println(
                     "Usage: " + HttpTunnelingClientExample.class.getSimpleName() +
                     " <URL>");
             System.err.println(
                     "Example: " + HttpTunnelingClientExample.class.getSimpleName() +
                     " http://localhost:8080/netty-tunnel");
             return;
         }
 
         URI uri = new URI(args[0]);
         new HttpTunnelingClientExample(uri).run();
     }
 }