NoCacheHeaderInterceptor


1   /* ***** BEGIN LICENSE BLOCK *****
2    * Version: MPL 1.1
3    * The contents of this file are subject to the Mozilla Public License Version
4    * 1.1 (the "License"); you may not use this file except in compliance with
5    * the License. You may obtain a copy of the License at
6    * http://www.mozilla.org/MPL/
7    * 
8    * Software distributed under the License is distributed on an "AS IS" basis,
9    * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
10   * for the specific language governing rights and limitations under the
11   * License.
12   * 
13   * The Original Code is Riot.
14   * 
15   * The Initial Developer of the Original Code is
16   * Neteye GmbH.
17   * Portions created by the Initial Developer are Copyright (C) 2006
18   * the Initial Developer. All Rights Reserved.
19   * 
20   * Contributor(s):
21   *   Felix Gnass [fgnass at neteye dot de]
22   * 
23   * ***** END LICENSE BLOCK ***** */
24  package org.riotfamily.website.interceptor;
25  
26  import javax.servlet.http.HttpServletRequest  ;
27  import javax.servlet.http.HttpServletResponse  ;
28  
29  import org.riotfamily.common.web.util.ServletUtils;
30  import org.riotfamily.riot.security.AccessController;
31  import org.springframework.web.servlet.ModelAndView;
32  import org.springframework.web.servlet.handler.HandlerInterceptorAdapter;
33  
34  /**
35   * Sets cache control headers to prevent client side caching if a Riot user 
36   * is logged in. This is especially useful if the user modifies a page via
37   * AJAX, leaves the page and hits the back button.
38   * 
39   * @author Felix Gnass [fgnass at neteye dot de]
40   */
41  public class NoCacheHeaderInterceptor extends HandlerInterceptorAdapter {
42  
43      public void postHandle(HttpServletRequest   request, 
44              HttpServletResponse   response, Object   handler,
45              ModelAndView modelAndView) throws Exception   {
46          
47          if (!response.isCommitted() && modelAndView != null 
48                  && AccessController.isAuthenticatedUser()) {
49              
50              ServletUtils.setNoCacheHeaders(response);
51          }
52      }
53  }
54
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