View Javadoc

1   //
2   //  ========================================================================
3   //  Copyright (c) 1995-2014 Mort Bay Consulting Pty. Ltd.
4   //  ------------------------------------------------------------------------
5   //  All rights reserved. This program and the accompanying materials
6   //  are made available under the terms of the Eclipse Public License v1.0
7   //  and Apache License v2.0 which accompanies this distribution.
8   //
9   //      The Eclipse Public License is available at
10  //      http://www.eclipse.org/legal/epl-v10.html
11  //
12  //      The Apache License v2.0 is available at
13  //      http://www.opensource.org/licenses/apache2.0.php
14  //
15  //  You may elect to redistribute this code under either of these licenses.
16  //  ========================================================================
17  //
18  
19  package org.eclipse.jetty.security;
20  
21  import java.security.SecureRandom;
22  import java.util.HashMap;
23  import java.util.Map;
24  import java.util.Random;
25  
26  import javax.servlet.http.Cookie;
27  import javax.servlet.http.HttpServletRequest;
28  import javax.servlet.http.HttpServletResponse;
29  
30  /**
31   * @version $Rev: 4660 $ $Date: 2009-02-25 17:29:53 +0100 (Wed, 25 Feb 2009) $
32   */
33  public class HashCrossContextPsuedoSession<T> implements CrossContextPsuedoSession<T>
34  {
35      private final String _cookieName;
36  
37      private final String _cookiePath;
38  
39      private final Random _random = new SecureRandom();
40  
41      private final Map<String, T> _data = new HashMap<String, T>();
42  
43      public HashCrossContextPsuedoSession(String cookieName, String cookiePath)
44      {
45          this._cookieName = cookieName;
46          this._cookiePath = cookiePath == null ? "/" : cookiePath;
47      }
48  
49      public T fetch(HttpServletRequest request)
50      {
51          for (Cookie cookie : request.getCookies())
52          {
53              if (_cookieName.equals(cookie.getName()))
54              {
55                  String key = cookie.getValue();
56                  return _data.get(key);
57              }
58          }
59          return null;
60      }
61  
62      public void store(T datum, HttpServletResponse response)
63      {
64          String key;
65  
66          synchronized (_data)
67          {
68              // Create new ID
69              while (true)
70              {
71                  key = Long.toString(Math.abs(_random.nextLong()), 30 + (int) (System.currentTimeMillis() % 7));
72                  if (!_data.containsKey(key)) break;
73              }
74  
75              _data.put(key, datum);
76          }
77  
78          Cookie cookie = new Cookie(_cookieName, key);
79          cookie.setPath(_cookiePath);
80          response.addCookie(cookie);
81      }
82  
83      public void clear(HttpServletRequest request)
84      {
85          for (Cookie cookie : request.getCookies())
86          {
87              if (_cookieName.equals(cookie.getName()))
88              {
89                  String key = cookie.getValue();
90                  _data.remove(key);
91                  break;
92              }
93          }
94      }
95  }