WikiRewriteFilter


1   /* Copyright 2000-2005 Anders Hovm�ller
2    *
3    * The person or persons who have associated their work with
4    * this document (the "Dedicator") hereby dedicate the entire
5    * copyright in the work of authorship identified below (the
6    * "Work") to the public domain.
7    *
8    * Dedicator makes this dedication for the benefit of the
9    * public at large and to the detriment of Dedicator's heirs
10   * and successors. Dedicator intends this dedication to be an
11   * overt act of relinquishment in perpetuity of all present
12   * and future rights under copyright law, whether vested or
13   * contingent, in the Work. Dedicator understands that such
14   * relinquishment of all rights includes the relinquishment of
15   * all rights to enforce (by lawsuit or otherwise) those
16   * copyrights in the Work.
17   *
18   * Dedicator recognizes that, once placed in the public
19   * domain, the Work may be freely reproduced, distributed,
20   * transmitted, used, modified, built upon, or otherwise
21   * exploited by anyone for any purpose, commercial or non-
22   * commercial, and in any way, including by methods that have
23   * not yet been invented or conceived.
24   */
25  
26  package  net.killingar.forum.filter;
27  
28  import javax.servlet.*;
29  import javax.servlet.http.HttpServletRequest  ;
30  
31  public class WikiRewriteFilter implements Filter
32  {
33      private FilterConfig filterConfig;
34  
35      public void doFilter(final ServletRequest   request, final ServletResponse response, FilterChain chain) throws java.io.IOException  , javax.servlet.ServletException  
36      {
37          HttpServletRequest   httpRequest = (HttpServletRequest  )request;
38  
39          boolean documents = false;
40          String   url = httpRequest.getRequestURI();
41          if (url.regionMatches(true, 0, "/wiki/", 0, "/wiki/".length()))
42              url = url.substring("/wiki/".length());
43          else if (url.regionMatches(true, 0, "/documents/", 0, "/documents/".length()))
44          {
45              documents = true;
46              url = url.substring("/documents/".length());
47          }
48          else
49              throw new RuntimeException  ("invalid url");
50  
51          String   context = null;
52          String   document = null;
53          int tmp = url.indexOf('/');
54          if (tmp != -1)
55          {
56              context = url.substring(0, tmp);
57              url = url.substring(tmp+1);
58              tmp = url.indexOf('/');
59              if (tmp != -1)
60                  document = url.substring(tmp);
61              else
62                  document = url;
63          }
64          else
65              context = url;
66  
67          if ("".equals(document))
68              document = null;
69          if ("".equals(context))
70              context = null;
71  
72          if (documents)
73          {
74              document = context;
75              context = null;
76          }
77  
78          StringBuffer   path = new StringBuffer  ("/wiki.view.action?");
79  
80          if (document != null)
81          {
82              path.append("wiki=");
83              path.append(document);
84          }
85          if (context != null)
86          {
87              if (document != null)
88                  path.append("&");
89  
90              path.append("context=");
91              path.append(context);
92          }
93  
94          RequestDispatcher disp = filterConfig.getServletContext().getRequestDispatcher(path.toString());
95  
96          disp.forward(request, response);
97  
98          //chain.doFilter(request, response);
99      }
100 
101     public void setFilterConfig(final FilterConfig filterConfig)
102     {
103         this.filterConfig = filterConfig;
104     }
105 
106     public FilterConfig getFilterConfig()
107     {
108         return filterConfig;
109     }
110 
111     public void init(FilterConfig filterConfig)
112     {
113         setFilterConfig(filterConfig);
114     }
115 
116     public void destroy()
117     {
118     }
119 }
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