TrivialDavFilter


1   /*
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3   * Copyright 2005, JBoss Inc., and individual contributors as indicated
4   * by the @authors tag. See the copyright.txt in the distribution for a
5   * full listing of individual contributors.
6   *
7   * This is free software; you can redistribute it and/or modify it
8   * under the terms of the GNU Lesser General Public License as
9   * published by the Free Software Foundation; either version 2.1 of
10  * the License, or (at your option) any later version.
11  *
12  * This software is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this software; if not, write to the Free
19  * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20  * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21  */
22  package org.jboss.netboot;
23  
24  import java.io.IOException  ;
25  import java.io.PrintWriter  ;
26  import java.text.SimpleDateFormat  ;
27  import java.util.Date  ;
28  import java.util.Iterator  ;
29  import java.util.Set  ;
30  import java.util.TimeZone  ;
31  import javax.servlet.Filter  ;
32  import javax.servlet.FilterChain  ;
33  import javax.servlet.FilterConfig  ;
34  import javax.servlet.ServletContext  ;
35  import javax.servlet.ServletException  ;
36  import javax.servlet.ServletRequest  ;
37  import javax.servlet.ServletResponse  ;
38  import javax.servlet.http.HttpServletRequest  ;
39  import javax.servlet.http.HttpServletResponse  ;
40  
41  /**
42   * <em>Very</em> simple filter to support WebDAV access to resources.
43   * Only intended to support the DavURLLister.
44   */
45  public class TrivialDavFilter implements Filter   {
46     private ServletContext   context;
47     private SimpleDateFormat   sharedFormat;
48  
49     public void init(FilterConfig   filterConfig) throws ServletException   {
50        context = filterConfig.getServletContext();
51        sharedFormat = new SimpleDateFormat  ("EEE, d MMM yyyy HH:mm:ss z", java.util.Locale.US);
52        sharedFormat.setTimeZone(TimeZone.getTimeZone("GMT"));
53     }
54  
55     public void doFilter(ServletRequest   request, ServletResponse   response, FilterChain   chain) throws IOException  , ServletException   {
56        if (request instanceof HttpServletRequest   == false) {
57           chain.doFilter(request, response);
58           return;
59        }
60  
61  
62        HttpServletRequest   hrequest = (HttpServletRequest  ) request;
63        String   method = hrequest.getMethod();
64        if ("PROPFIND".equals(method)) {
65           doPropfind(hrequest, (HttpServletResponse  ) response);
66        } else {
67           chain.doFilter(request, response);
68        }
69     }
70  
71     public void destroy() {
72        sharedFormat = null;
73        context = null;
74     }
75  
76     private void doPropfind(HttpServletRequest   request, HttpServletResponse   response) throws IOException   {
77        String   contextPath = request.getContextPath();
78  
79        // get the path from the request URI - Jetty does not return a valid
80        // servlet path if this filter is mapped to '/'
81        String   path = request.getRequestURI().substring(contextPath.length());
82  
83        // keep WEB-INF hidden
84        // also check for missing resources (Jetty does not report this below)
85        if (path.startsWith("/WEB-INF") || context.getResource(path) == null) {
86           response.sendError(HttpServletResponse.SC_NOT_FOUND);
87           return;
88        }
89  
90        Set   resourcePaths = context.getResourcePaths(path);
91        if (resourcePaths == null) {
92           // not found -- should not happen due to check above
93           // not all containers seem to return null here
94           response.sendError(HttpServletResponse.SC_NOT_FOUND);
95           return;
96        }
97  
98        // SimpleDateFormat is not thread-safe, so clone here.
99        SimpleDateFormat   dateFormat = (SimpleDateFormat  ) sharedFormat.clone();
100 
101       response.setStatus(207); // DAV MultiStatus Response
102       PrintWriter   out = response.getWriter();
103       out.println("<?xml version='1.0' encoding='utf-8' ?>");
104       out.println("<D:multistatus xmlns:D='DAV:'>");
105 
106       if (resourcePaths.isEmpty()) {
107          // not a collection - do the resource itself
108          writeResponse(out, contextPath, path, dateFormat);
109       } else {
110          for (Iterator   i = resourcePaths.iterator(); i.hasNext();) {
111             String   s = (String  ) i.next();
112             writeResponse(out, contextPath, s, dateFormat);
113          }
114       }
115       out.println("</D:multistatus>");
116       out.flush();
117       response.flushBuffer();
118    }
119 
120    private void writeResponse(PrintWriter   out, String   contextPath, String   path, SimpleDateFormat   dateFormat) throws IOException   {
121       Date   lastModified = new Date  (context.getResource(path).openConnection().getLastModified());
122       out.println("<D:response>");
123       out.println("<D:href>" + contextPath + path + "</D:href>");
124       out.println("<D:propstat>");
125       out.println("<D:prop>");
126       if (path.endsWith("/")) {
127          out.println("<D:resourcetype><D:collection/></D:resourcetype>");
128       } else {
129          out.println("<D:resourcetype/>");
130       }
131       out.println("<D:getlastmodified>" + dateFormat.format(lastModified) + "</D:getlastmodified>");
132       out.println("</D:prop>");
133       out.println("<D:status>HTTP/1.1 200 OK</D:status>");
134       out.println("</D:propstat>");
135       out.println("</D:response>");
136    }
137 }
138
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