/*
    * 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.
   */
  
  package org.apache.commons.net.ftp;
  
  import java.io.IOException;
  import java.net.InetAddress;
  import java.net.ServerSocket;
  
  import javax.net.ServerSocketFactory;
  import javax.net.ssl.SSLContext;
  import javax.net.ssl.SSLServerSocket;
  import javax.net.ssl.SSLServerSocketFactory;
  
  /**
   * Server socket factory for FTPS connections.
   *
   * @since 2.2
   */
  public class FTPSServerSocketFactory extends ServerSocketFactory {
  
      /** Factory for secure socket factories */
      private final SSLContext sslContext;
  
      /**
       * Constructs a new instance for the given SSL context.
       *
       * @param sslContext The SSL context.
       */
      public FTPSServerSocketFactory(final SSLContext sslContext) {
          this.sslContext = sslContext;
      }
  
      @SuppressWarnings("resource") // Factory method.
      @Override
      public ServerSocket createServerSocket() throws IOException {
          return init(getServerSocketFactory().createServerSocket());
      }
  
      @SuppressWarnings("resource") // Factory method.
      @Override
      public ServerSocket createServerSocket(final int port) throws IOException {
          return init(getServerSocketFactory().createServerSocket(port));
      }
  
      @SuppressWarnings("resource") // Factory method.
      @Override
      public ServerSocket createServerSocket(final int port, final int backlog) throws IOException {
          return init(getServerSocketFactory().createServerSocket(port, backlog));
      }
  
      @SuppressWarnings("resource") // Factory method.
      @Override
      public ServerSocket createServerSocket(final int port, final int backlog, final InetAddress ifAddress) throws IOException {
          return init(getServerSocketFactory().createServerSocket(port, backlog, ifAddress));
      }
  
      private SSLServerSocketFactory getServerSocketFactory() {
          return this.sslContext.getServerSocketFactory();
      }
  
      /**
       * Sets the socket so newly accepted connections will use SSL client mode.
       *
       * @param socket the SSLServerSocket to initialize
       * @return the socket
       * @throws ClassCastException if socket is not an instance of SSLServerSocket
       */
      public ServerSocket init(final ServerSocket socket) {
          ((SSLServerSocket) socket).setUseClientMode(true);
          return socket;
      }
  }