/*
    * ====================================================================
    * 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.impl.nio;
  
  import javax.net.ssl.SSLContext;
  
  import org.apache.http.HttpResponseFactory;
  import org.apache.http.annotation.Immutable;
  import org.apache.http.impl.DefaultHttpResponseFactory;
  import org.apache.http.nio.NHttpClientConnection;
  import org.apache.http.nio.NHttpConnectionFactory;
  import org.apache.http.nio.reactor.IOSession;
  import org.apache.http.nio.reactor.ssl.SSLIOSession;
  import org.apache.http.nio.reactor.ssl.SSLMode;
  import org.apache.http.nio.reactor.ssl.SSLSetupHandler;
  import org.apache.http.nio.util.ByteBufferAllocator;
  import org.apache.http.nio.util.HeapByteBufferAllocator;
  import org.apache.http.params.HttpConnectionParams;
  import org.apache.http.params.HttpParams;
  
  /**
   * Factory for SSL encrypted, non-blocking {@link NHttpClientConnection}s.
   * <p>
   * The following parameters can be used to customize the behavior of this
   * class:
   * <ul>
   *  <li>{@link org.apache.http.params.CoreProtocolPNames#HTTP_ELEMENT_CHARSET}</li>
   *  <li>{@link org.apache.http.params.CoreConnectionPNames#SO_TIMEOUT}</li>
   *  <li>{@link org.apache.http.params.CoreConnectionPNames#SOCKET_BUFFER_SIZE}</li>
   *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_HEADER_COUNT}</li>
   *  <li>{@link org.apache.http.params.CoreConnectionPNames#MAX_LINE_LENGTH}</li>
   * </ul>
   *
   * @since 4.2
   */
  @Immutable
  public class SSLNHttpClientConnectionFactory
      implements NHttpConnectionFactory<DefaultNHttpClientConnection> {
  
      private final HttpResponseFactory responseFactory;
      private final ByteBufferAllocator allocator;
      private final SSLContext sslcontext;
      private final SSLSetupHandler sslHandler;
      private final HttpParams params;
  
      public SSLNHttpClientConnectionFactory(
              final SSLContext sslcontext,
              final SSLSetupHandler sslHandler,
              final HttpResponseFactory responseFactory,
              final ByteBufferAllocator allocator,
              final HttpParams params) {
          super();
          if (responseFactory == null) {
              throw new IllegalArgumentException("HTTP response factory may not be null");
          }
          if (allocator == null) {
              throw new IllegalArgumentException("Byte buffer allocator may not be null");
          }
          if (params == null) {
              throw new IllegalArgumentException("HTTP parameters may not be null");
          }
          this.sslcontext = sslcontext;
          this.sslHandler = sslHandler;
          this.responseFactory = responseFactory;
          this.allocator = allocator;
          this.params = params;
      }
  
      public SSLNHttpClientConnectionFactory(
              final SSLContext sslcontext,
              final SSLSetupHandler sslHandler,
              final HttpParams params) {
          this(sslcontext, sslHandler, new DefaultHttpResponseFactory(), new HeapByteBufferAllocator(), params);
      }
  
     public SSLNHttpClientConnectionFactory(final HttpParams params) {
         this(null, null, params);
     }
 
     private SSLContext getDefaultSSLContext() {
         SSLContext sslcontext;
         try {
             sslcontext = SSLContext.getInstance("TLS");
             sslcontext.init(null, null, null);
         } catch (Exception ex) {
             throw new IllegalStateException("Failure initializing default SSL context", ex);
         }
         return sslcontext;
     }
 
     protected DefaultNHttpClientConnection createConnection(
             final IOSession session,
             final HttpResponseFactory responseFactory,
             final ByteBufferAllocator allocator,
             final HttpParams params) {
         return new DefaultNHttpClientConnection(session, responseFactory, allocator, params);
     }
 
     public DefaultNHttpClientConnection createConnection(final IOSession session) {
         SSLContext sslcontext = this.sslcontext != null ? this.sslcontext : getDefaultSSLContext();
         SSLIOSession ssliosession = new SSLIOSession(session, SSLMode.CLIENT, sslcontext, this.sslHandler);
         session.setAttribute(SSLIOSession.SESSION_KEY, ssliosession);
         DefaultNHttpClientConnection conn = createConnection(
                 ssliosession, this.responseFactory, this.allocator, this.params);
         int timeout = HttpConnectionParams.getSoTimeout(this.params);
         conn.setSocketTimeout(timeout);
         return conn;
     }
 
 }