1 /**
2 * This file Copyright (c) 2003-2011 Magnolia International
3 * Ltd. (http://www.magnolia-cms.com). All rights reserved.
4 *
5 *
6 * This file is dual-licensed under both the Magnolia
7 * Network Agreement and the GNU General Public License.
8 * You may elect to use one or the other of these licenses.
9 *
10 * This file is distributed in the hope that it will be
11 * useful, but AS-IS and WITHOUT ANY WARRANTY; without even the
12 * implied warranty of MERCHANTABILITY or FITNESS FOR A
13 * PARTICULAR PURPOSE, TITLE, or NONINFRINGEMENT.
14 * Redistribution, except as permitted by whichever of the GPL
15 * or MNA you select, is prohibited.
16 *
17 * 1. For the GPL license (GPL), you can redistribute and/or
18 * modify this file under the terms of the GNU General
19 * Public License, Version 3, as published by the Free Software
20 * Foundation. You should have received a copy of the GNU
21 * General Public License, Version 3 along with this program;
22 * if not, write to the Free Software Foundation, Inc., 51
23 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
24 *
25 * 2. For the Magnolia Network Agreement (MNA), this file
26 * and the accompanying materials are made available under the
27 * terms of the MNA which accompanies this distribution, and
28 * is available at http://www.magnolia-cms.com/mna.html
29 *
30 * Any modifications to this file must keep this entire header
31 * intact.
32 *
33 */
34 package info.magnolia.cms.filters;
35
36 import info.magnolia.cms.beans.config.VirtualURIManager;
37 import info.magnolia.cms.core.AggregationState;
38 import info.magnolia.cms.util.RequestDispatchUtil;
39 import info.magnolia.context.MgnlContext;
40
41 import java.io.IOException;
42 import javax.servlet.FilterChain;
43 import javax.servlet.ServletException;
44 import javax.servlet.http.HttpServletRequest;
45 import javax.servlet.http.HttpServletResponse;
46
47 import org.apache.commons.lang.StringUtils;
48 import org.slf4j.Logger;
49 import org.slf4j.LoggerFactory;
50
51 /**
52 * Handle redirects configured using VirtualURIMappings.
53 *
54 * @author Fabrizio Giustina
55 * @version $Id: VirtualUriFilter.java 52599 2011-12-13 09:27:09Z mdivilek $
56 * @see info.magnolia.cms.beans.config.VirtualURIMapping
57 */
58 public class VirtualUriFilter extends AbstractMgnlFilter {
59
60 private static final Logger log = LoggerFactory.getLogger(VirtualUriFilter.class);
61
62 public void doFilter(HttpServletRequest request, HttpServletResponse response, FilterChain chain)
63 throws IOException, ServletException {
64
65 final AggregationState aggregationState = MgnlContext.getAggregationState();
66 String targetUri = getURIMapping(aggregationState.getCurrentURI(), aggregationState.getQueryString());
67
68 if (StringUtils.isEmpty(targetUri)) {
69 chain.doFilter(request, response);
70 return;
71 }
72
73 if (response.isCommitted()) {
74 log.warn(
75 "Response is already committed, cannot apply virtual URI {} (original URI was {})",
76 targetUri,
77 request.getRequestURI());
78 chain.doFilter(request, response);
79 return;
80 }
81
82 if (RequestDispatchUtil.dispatch(targetUri, request, response))
83 return;
84
85 aggregationState.setCurrentURI(targetUri);
86 chain.doFilter(request, response);
87 }
88
89 /**
90 * @return URI mapping as in ServerInfo
91 */
92 protected String getURIMapping(String currentURI) {
93 return VirtualURIManager.getInstance().getURIMapping(currentURI);
94 }
95
96 /**
97 * @return URI mapping as in ServerInfo
98 */
99 protected String getURIMapping(String currentURI, String queryString) {
100 return VirtualURIManager.getInstance().getURIMapping(currentURI, queryString);
101 }
102 }