/*
    * ====================================================================
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  
  package org.apache.hc.client5.http.examples;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.Proxy;
  import java.net.Socket;
  
  import org.apache.hc.client5.http.classic.methods.HttpGet;
  import org.apache.hc.client5.http.impl.classic.CloseableHttpClient;
  import org.apache.hc.client5.http.impl.classic.HttpClients;
  import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManager;
  import org.apache.hc.client5.http.impl.io.PoolingHttpClientConnectionManagerBuilder;
  import org.apache.hc.client5.http.socket.ConnectionSocketFactory;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.config.Registry;
  import org.apache.hc.core5.http.config.RegistryBuilder;
  import org.apache.hc.core5.http.io.SocketConfig;
  import org.apache.hc.core5.http.io.entity.EntityUtils;
  import org.apache.hc.core5.http.message.StatusLine;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.util.TimeValue;
  
  /**
   * How to send a request via SOCKS proxy.
   *
   * @since 4.1
   */
  public class ClientExecuteSOCKS {
  
      public static void main(final String[] args)throws Exception {
          final Registry<ConnectionSocketFactory> reg = RegistryBuilder.<ConnectionSocketFactory>create()
                  .register("http", new MyConnectionSocketFactory())
                  .build();
          final InetSocketAddress socksaddr = new InetSocketAddress("mysockshost", 1234);
          final PoolingHttpClientConnectionManager cm = PoolingHttpClientConnectionManagerBuilder.create()
                  .setDefaultSocketConfig(SocketConfig.custom()
                          .setSocksProxyAddress(socksaddr)
                          .build())
                  .build();
          try (final CloseableHttpClient httpclient = HttpClients.custom()
                  .setConnectionManager(cm)
                  .build()) {
  
              final HttpHost target = new HttpHost("http", "httpbin.org", 80);
              final HttpGet request = new HttpGet("/get");
  
              System.out.println("Executing request " + request.getMethod() + " " + request.getUri() +
                      " via SOCKS proxy " + socksaddr);
              httpclient.execute(target, request, response -> {
                  System.out.println("----------------------------------------");
                  System.out.println(request + "->" + new StatusLine(response));
                  EntityUtils.consume(response.getEntity());
                  return null;
              });
          }
      }
  
      static class MyConnectionSocketFactory implements ConnectionSocketFactory {
  
          @Override
          public Socket createSocket(final HttpContext context) throws IOException {
              final InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
              final Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
              return new Socket(proxy);
          }
  
          @Override
          public Socket connectSocket(
                  final TimeValue connectTimeout,
                  final Socket socket,
                  final HttpHost host,
                  final InetSocketAddress remoteAddress,
                 final InetSocketAddress localAddress,
                 final HttpContext context) throws IOException {
             final Socket sock;
             if (socket != null) {
                 sock = socket;
             } else {
                 sock = createSocket(context);
             }
             if (localAddress != null) {
                 sock.bind(localAddress);
             }
             sock.connect(remoteAddress, connectTimeout != null ? connectTimeout.toMillisecondsIntBound() : 0);
             return sock;
         }
 
     }
 
 }