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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  package org.apache.myfaces.webapp.filter;
20  
21  import java.io.IOException;
22  
23  import javax.servlet.Filter;
24  import javax.servlet.FilterChain;
25  import javax.servlet.FilterConfig;
26  import javax.servlet.ServletException;
27  import javax.servlet.ServletRequest;
28  import javax.servlet.ServletResponse;
29  import javax.servlet.http.HttpServletRequest;
30  import javax.servlet.http.HttpServletResponse;
31  
32  import org.apache.commons.logging.Log;
33  import org.apache.commons.logging.LogFactory;
34  import org.apache.myfaces.shared_tomahawk.renderkit.html.util.JavascriptUtils;
35  
36  
37  /**
38   *
39   * Filter to handle javascript detection redirect. This is an EXPERIMENTAL feature.
40   *
41   * @author Oliver Rossmueller (latest modification by $Author: grantsmith $)
42   *
43   */
44  public class JavaScriptDetectorFilter implements Filter
45  {
46      private static final Log log = LogFactory.getLog(JavaScriptDetectorFilter.class);
47  
48      public void init(FilterConfig filterConfig) throws ServletException
49      {
50      }
51  
52      public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException
53      {
54          HttpServletRequest request = (HttpServletRequest) servletRequest;
55          HttpServletResponse response = (HttpServletResponse) servletResponse;
56  
57          JavascriptUtils.setJavascriptDetected(request.getSession(true), true); // mark the session to use javascript
58  
59          String redirectURL = response.encodeRedirectURL(request.getParameter("goto"));
60          log.info("Enabled JavaScript for session - redirect to " + redirectURL);
61          response.sendRedirect(redirectURL);
62      }
63  
64      public void destroy()
65      {
66      }
67  }