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1   //
2   //  ========================================================================
3   //  Copyright (c) 1995-2015 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.rewrite.handler;
20  
21  import java.io.IOException;
22  import java.util.regex.Matcher;
23  
24  import javax.servlet.http.HttpServletRequest;
25  import javax.servlet.http.HttpServletResponse;
26  
27  /**
28   * Redirects the response by matching with a regular expression.
29   * The replacement string may use $n" to replace the nth capture group.
30   */
31  public class RedirectRegexRule extends RegexRule
32  {
33      private String _replacement;
34      
35      public RedirectRegexRule()
36      {
37          _handling = true;
38          _terminating = true;
39      }
40  
41      /**
42       * Whenever a match is found, it replaces with this value.
43       * 
44       * @param replacement the replacement string.
45       */
46      public void setReplacement(String replacement)
47      {
48          _replacement = replacement;
49      }
50      
51      @Override
52      protected String apply(String target, HttpServletRequest request, HttpServletResponse response, Matcher matcher)
53              throws IOException
54      {
55          target=_replacement;
56          for (int g=1;g<=matcher.groupCount();g++)
57          {
58              String group = matcher.group(g);
59              target=target.replaceAll("\\$"+g,group);
60          }
61  
62          response.sendRedirect(response.encodeRedirectURL(target));
63          return target;
64      }
65  }