1 //
2 // ========================================================================
3 // Copyright (c) 1995-2013 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 import org.eclipse.jetty.http.HttpURI;
28 import org.eclipse.jetty.server.Request;
29
30 /**
31 * Rewrite the URI by matching with a regular expression.
32 * The replacement string may use $n" to replace the nth capture group.
33 * If the replacement string contains ? character, then it is split into a path
34 * and query string component. The replacement query string may also contain $Q, which
35 * is replaced with the original query string.
36 * The returned target contains only the path.
37 */
38 public class RewriteRegexRule extends RegexRule implements Rule.ApplyURI
39 {
40 private String _replacement;
41 private String _query;
42 private boolean _queryGroup;
43
44 /* ------------------------------------------------------------ */
45 public RewriteRegexRule()
46 {
47 _handling = false;
48 _terminating = false;
49 }
50
51 /* ------------------------------------------------------------ */
52 /**
53 * Whenever a match is found, it replaces with this value.
54 *
55 * @param replacement the replacement string.
56 */
57 public void setReplacement(String replacement)
58 {
59 String[] split=replacement.split("\\?",2);
60 _replacement = split[0];
61 _query=split.length==2?split[1]:null;
62 _queryGroup=_query!=null && _query.contains("$Q");
63 }
64
65
66 /* ------------------------------------------------------------ */
67 /* (non-Javadoc)
68 * @see org.eclipse.jetty.server.handler.rules.RegexRule#apply(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.util.regex.Matcher)
69 */
70 public String apply(String target, HttpServletRequest request, HttpServletResponse response, Matcher matcher) throws IOException
71 {
72 target=_replacement;
73 String query=_query;
74 for (int g=1;g<=matcher.groupCount();g++)
75 {
76 String group=matcher.group(g);
77 if (group==null)
78 group="";
79 else
80 group = Matcher.quoteReplacement(group);
81 target=target.replaceAll("\\$"+g,group);
82 if (query!=null)
83 query=query.replaceAll("\\$"+g,group);
84 }
85
86 if (query!=null)
87 {
88 if (_queryGroup)
89 query=query.replace("$Q",request.getQueryString()==null?"":request.getQueryString());
90 request.setAttribute("org.eclipse.jetty.rewrite.handler.RewriteRegexRule.Q",query);
91 }
92
93 return target;
94 }
95
96 /* ------------------------------------------------------------ */
97 public void applyURI(Request request, String oldTarget, String newTarget) throws IOException
98 {
99 if (_query==null)
100 {
101 request.setRequestURI(newTarget);
102 }
103 else
104 {
105 String query=(String)request.getAttribute("org.eclipse.jetty.rewrite.handler.RewriteRegexRule.Q");
106
107 if (!_queryGroup && request.getQueryString()!=null)
108 query=request.getQueryString()+"&"+query;
109 HttpURI uri=new HttpURI(newTarget+"?"+query);
110 request.setUri(uri);
111 request.setRequestURI(newTarget);
112 request.setQueryString(query);
113 }
114 }
115
116 /* ------------------------------------------------------------ */
117 /**
118 * Returns the replacement string.
119 */
120 public String toString()
121 {
122 return super.toString()+"["+_replacement+"]";
123 }
124 }