/*
 * ====================================================================
 * 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.http.examples.client;

import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.Proxy;
import java.net.Socket;
import java.net.SocketTimeoutException;

import org.apache.http.HttpHost;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.protocol.HttpClientContext;
import org.apache.http.config.Registry;
import org.apache.http.config.RegistryBuilder;
import org.apache.http.conn.ConnectTimeoutException;
import org.apache.http.conn.socket.ConnectionSocketFactory;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.impl.conn.PoolingHttpClientConnectionManager;
import org.apache.http.protocol.HttpContext;
import org.apache.http.util.EntityUtils;

/**
 * How to send a request via SOCKS proxy.
 *
 * @since 4.1
 */
public class ClientExecuteSOCKS {

    public static void main(String[] args)throws Exception {
        Registry<ConnectionSocketFactory> reg = RegistryBuilder.<ConnectionSocketFactory>create()
                .register("http", new MyConnectionSocketFactory())
                .build();
        PoolingHttpClientConnectionManager cm = new PoolingHttpClientConnectionManager(reg);
        CloseableHttpClient httpclient = HttpClients.custom()
                .setConnectionManager(cm)
                .build();
        try {
            InetSocketAddress socksaddr = new InetSocketAddress("mysockshost", 1234);
            HttpClientContext context = HttpClientContext.create();
            context.setAttribute("socks.address", socksaddr);

            HttpHost target = new HttpHost("httpbin.org", 80, "http");
            HttpGet request = new HttpGet("/");

            System.out.println("Executing request " + request + " to " + target + " via SOCKS proxy " + socksaddr);
            CloseableHttpResponse response = httpclient.execute(target, request, context);
            try {
                System.out.println("----------------------------------------");
                System.out.println(response.getStatusLine());
                EntityUtils.consume(response.getEntity());
            } finally {
                response.close();
            }
        } finally {
            httpclient.close();
        }
    }

    static class MyConnectionSocketFactory implements ConnectionSocketFactory {

        @Override
        public Socket createSocket(final HttpContext context) throws IOException {
            InetSocketAddress socksaddr = (InetSocketAddress) context.getAttribute("socks.address");
            Proxy proxy = new Proxy(Proxy.Type.SOCKS, socksaddr);
            return new Socket(proxy);
        }

        @Override
        public Socket connectSocket(
                final int connectTimeout,
                final Socket socket,
                final HttpHost host,
                final InetSocketAddress remoteAddress,
                final InetSocketAddress localAddress,
                final HttpContext context) throws IOException, ConnectTimeoutException {
            Socket sock;
            if (socket != null) {
                sock = socket;
            } else {
                sock = createSocket(context);
            }
            if (localAddress != null) {
                sock.bind(localAddress);
            }
            try {
                sock.connect(remoteAddress, connectTimeout);
            } catch (SocketTimeoutException ex) {
                throw new ConnectTimeoutException(ex, host, remoteAddress.getAddress());
            }
            return sock;
        }

    }

}
