/*
    * ====================================================================
    * 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.socket;
  
  import java.io.IOException;
  import java.net.InetSocketAddress;
  import java.net.Proxy;
  import java.net.Socket;
  import java.security.AccessController;
  import java.security.PrivilegedActionException;
  import java.security.PrivilegedExceptionAction;
  
  import org.apache.hc.core5.annotation.Contract;
  import org.apache.hc.core5.annotation.ThreadingBehavior;
  import org.apache.hc.core5.http.HttpHost;
  import org.apache.hc.core5.http.protocol.HttpContext;
  import org.apache.hc.core5.io.Closer;
  import org.apache.hc.core5.util.Asserts;
  import org.apache.hc.core5.util.TimeValue;
  
  /**
   * The default class for creating plain (unencrypted) sockets.
   *
   * @since 4.3
   */
  @Contract(threading = ThreadingBehavior.STATELESS)
  public class PlainConnectionSocketFactory implements ConnectionSocketFactory {
  
      public static final PlainConnectionSocketFactory INSTANCE = new PlainConnectionSocketFactory();
  
      public static PlainConnectionSocketFactory getSocketFactory() {
          return INSTANCE;
      }
  
      public PlainConnectionSocketFactory() {
          super();
      }
  
      @Override
      public Socket createSocket(final Proxy proxy, final HttpContext context) throws IOException {
          return proxy != null ? new Socket(proxy) : createSocket(context);
      }
  
      @Override
      public Socket createSocket(final HttpContext context) throws IOException {
          return new Socket();
      }
  
      @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 = socket != null ? socket : createSocket(context);
          if (localAddress != null) {
              sock.bind(localAddress);
          }
          try {
              // Run this under a doPrivileged to support lib users that run under a SecurityManager this allows granting connect permissions
              // only to this library
              try {
                  AccessController.doPrivileged((PrivilegedExceptionAction<Object>) () -> {
                      sock.connect(remoteAddress, TimeValue.isPositive(connectTimeout) ? connectTimeout.toMillisecondsIntBound() : 0);
                      return null;
                  });
              } catch (final PrivilegedActionException e) {
                  Asserts.check(e.getCause() instanceof  IOException,
                          "method contract violation only checked exceptions are wrapped: " + e.getCause());
                  // only checked exceptions are wrapped - error and RTExceptions are rethrown by doPrivileged
                  throw (IOException) e.getCause();
              }
         } catch (final IOException ex) {
             Closer.closeQuietly(sock);
             throw ex;
         }
         return sock;
     }
 
 }