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1   /*
2    *  Licensed to the Apache Software Foundation (ASF) under one
3    *  or more contributor license agreements.  See the NOTICE file
4    *  distributed with this work for additional information
5    *  regarding copyright ownership.  The ASF licenses this file
6    *  to you under the Apache License, Version 2.0 (the
7    *  "License"); you may not use this file except in compliance
8    *  with the License.  You may obtain a copy of the License at
9    *
10   *    http://www.apache.org/licenses/LICENSE-2.0
11   *
12   *  Unless required by applicable law or agreed to in writing,
13   *  software distributed under the License is distributed on an
14   *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
15   *  KIND, either express or implied.  See the License for the
16   *  specific language governing permissions and limitations
17   *  under the License.
18   *
19   */
20  package org.apache.mina.proxy;
21  
22  import org.apache.mina.core.service.IoHandler;
23  import org.apache.mina.core.service.IoHandlerAdapter;
24  import org.apache.mina.core.session.IoSession;
25  import org.apache.mina.proxy.handlers.socks.SocksProxyRequest;
26  import org.apache.mina.proxy.session.ProxyIoSession;
27  import org.slf4j.Logger;
28  import org.slf4j.LoggerFactory;
29  
30  /**
31   * AbstractProxyIoHandler.java - {@link IoHandler} that intercepts events until handshake is complete.
32   * 
33   * @author <a href="http://mina.apache.org">Apache MINA Project</a>
34   * @since MINA 2.0.0-M3
35   */
36  public abstract class AbstractProxyIoHandler extends IoHandlerAdapter {
37      private final static Logger logger = LoggerFactory.getLogger(AbstractProxyIoHandler.class);
38  
39      /**
40       * Method called only when handshake has completed.
41       * 
42       * @param session the io session
43       */
44      public abstract void proxySessionOpened(IoSession session) throws Exception;
45  
46      /**
47       * Hooked session opened event.
48       * 
49       * @param session the io session
50       */
51      @Override
52      public final void sessionOpened(IoSession session) throws Exception {
53          ProxyIoSession proxyIoSession = (ProxyIoSession) session.getAttribute(ProxyIoSession.PROXY_SESSION);
54  
55          if (proxyIoSession.getRequest() instanceof SocksProxyRequest || proxyIoSession.isAuthenticationFailed()
56                  || proxyIoSession.getHandler().isHandshakeComplete()) {
57              proxySessionOpened(session);
58          } else {
59              logger.debug("Filtered session opened event !");
60          }
61      }
62  }