//
   //  ========================================================================
   //  Copyright (c) 1995-2013 Mort Bay Consulting Pty. Ltd.
   //  ------------------------------------------------------------------------
   //  All rights reserved. This program and the accompanying materials
   //  are made available under the terms of the Eclipse Public License v1.0
   //  and Apache License v2.0 which accompanies this distribution.
   //
   //      The Eclipse Public License is available at
  //      http://www.eclipse.org/legal/epl-v10.html
  //
  //      The Apache License v2.0 is available at
  //      http://www.opensource.org/licenses/apache2.0.php
  //
  //  You may elect to redistribute this code under either of these licenses.
  //  ========================================================================
  //
  
  package org.eclipse.jetty.security;
  
  import java.security.SecureRandom;
  import java.util.HashMap;
  import java.util.Map;
  import java.util.Random;
  
  import javax.servlet.http.Cookie;
  import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  /**
   * @version $Rev: 4660 $ $Date: 2009-02-25 17:29:53 +0100 (Wed, 25 Feb 2009) $
   */
  public class HashCrossContextPsuedoSession<T> implements CrossContextPsuedoSession<T>
  {
      private final String _cookieName;
  
      private final String _cookiePath;
  
      private final Random _random = new SecureRandom();
  
      private final Map<String, T> _data = new HashMap<String, T>();
  
      public HashCrossContextPsuedoSession(String cookieName, String cookiePath)
      {
          this._cookieName = cookieName;
          this._cookiePath = cookiePath == null ? "/" : cookiePath;
      }
  
      public T fetch(HttpServletRequest request)
      {
          Cookie[] cookies = request.getCookies();
          if (cookies == null)
              return null;
          
          for (Cookie cookie : cookies)
          {
              if (_cookieName.equals(cookie.getName()))
              {
                  String key = cookie.getValue();
                  return _data.get(key);
              }
          }
          return null;
      }
  
      public void store(T datum, HttpServletResponse response)
      {
          String key;
  
          synchronized (_data)
          {
              // Create new ID
              while (true)
              {
                  key = Long.toString(Math.abs(_random.nextLong()), 30 + (int) (System.currentTimeMillis() % 7));
                  if (!_data.containsKey(key)) break;
              }
  
              _data.put(key, datum);
          }
  
          Cookie cookie = new Cookie(_cookieName, key);
          cookie.setPath(_cookiePath);
          response.addCookie(cookie);
      }
  
      public void clear(HttpServletRequest request)
      {
          for (Cookie cookie : request.getCookies())
          {
              if (_cookieName.equals(cookie.getName()))
              {
                  String key = cookie.getValue();
                  _data.remove(key);
                  break;
              }
          }
      }
  }