code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/server/CacheFilter.java

   1 /*
   2  * Copyright 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.server;
  20
  21 import java.io.IOException;
  22 import java.util.Date;
  23
  24 import javax.servlet.Filter;
  25 import javax.servlet.FilterChain;
  26 import javax.servlet.FilterConfig;
  27 import javax.servlet.ServletException;
  28 import javax.servlet.ServletRequest;
  29 import javax.servlet.ServletResponse;
  30 import javax.servlet.http.HttpServletRequest;
  31 import javax.servlet.http.HttpServletResponse;
  32
  33 /**
  34  * A cache filter that properly caches GWT-generated files.
  35  *
  36  * @author past
  37  *
  38  */
  39 public class CacheFilter implements Filter {
  40         public void doFilter( ServletRequest request, ServletResponse response,
  41                         FilterChain filterChain) throws IOException, ServletException {
  42                 HttpServletRequest httpRequest = (HttpServletRequest)request;
  43                 String requestURI = httpRequest.getRequestURI();
  44                 String contextPath = httpRequest.getContextPath();
  45                 if (requestURI.contains(".nocache.")) {
  46                         HttpServletResponse httpResponse = (HttpServletResponse)response;
  47                         httpResponse.setHeader("Expires", "Fri, 01 Jan 1990 00:00:00 GMT");
  48                         httpResponse.setHeader("Pragma", "no-cache");
  49                         httpResponse.setHeader("Cache-control", "no-cache, must-revalidate");
  50                 } else if (requestURI.contains(".cache.")) {
  51                         long today = new Date().getTime();
  52                         HttpServletResponse httpResponse = (HttpServletResponse)response;
  53                         httpResponse.setDateHeader("Expires", today+31536000000L);
  54                 } else if (!requestURI.startsWith(contextPath + "/nonce") &&
  55                                         !requestURI.startsWith(contextPath + "/token") &&
  56                                         !requestURI.startsWith(contextPath + "/login") &&
  57                                         !requestURI.startsWith(contextPath + "/rest") &&
  58                                         !requestURI.startsWith(contextPath + "/policy")) {
  59                         long today = new Date().getTime();
  60                         HttpServletResponse httpResponse = (HttpServletResponse)response;
  61                         httpResponse.setDateHeader("Expires", today+3456000000L);
  62                 }
  63                 filterChain.doFilter(request, response);
  64         }
  65
  66         @Override
  67         public void destroy() {
  68         }
  69
  70         @Override
  71         public void init(FilterConfig filterConfig) {
  72         }
  73 }