1 //
2 // ========================================================================
3 // Copyright (c) 1995-2016 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.server.Request;
28
29 /**
30 * Rewrite the URI by matching with a regular expression.
31 * The replacement string may use $n" to replace the nth capture group.
32 * If the replacement string contains ? character, then it is split into a path
33 * and query string component. The replacement query string may also contain $Q, which
34 * is replaced with the original query string.
35 * The returned target contains only the path.
36 */
37 public class RewriteRegexRule extends RegexRule implements Rule.ApplyURI
38 {
39 private String _replacement;
40 private String _query;
41 private boolean _queryGroup;
42
43 /* ------------------------------------------------------------ */
44 public RewriteRegexRule()
45 {
46 _handling = false;
47 _terminating = false;
48 }
49
50 /* ------------------------------------------------------------ */
51 /**
52 * Whenever a match is found, it replaces with this value.
53 *
54 * @param replacement the replacement string.
55 */
56 public void setReplacement(String replacement)
57 {
58 String[] split=replacement.split("\\?",2);
59 _replacement = split[0];
60 _query=split.length==2?split[1]:null;
61 _queryGroup=_query!=null && _query.contains("$Q");
62 }
63
64
65 /* ------------------------------------------------------------ */
66 /* (non-Javadoc)
67 * @see org.eclipse.jetty.server.handler.rules.RegexRule#apply(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse, java.util.regex.Matcher)
68 */
69 @Override
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 @Override
98 public void applyURI(Request request, String oldURI, String newURI) throws IOException
99 {
100 if (_query==null)
101 {
102 request.setURIPathQuery(newURI);
103 }
104 else
105 {
106 String query=(String)request.getAttribute("org.eclipse.jetty.rewrite.handler.RewriteRegexRule.Q");
107
108 if (!_queryGroup && request.getQueryString()!=null)
109 query=request.getQueryString()+"&"+query;
110 request.setURIPathQuery(newURI);
111 request.setQueryString(query);
112 }
113 }
114
115 /* ------------------------------------------------------------ */
116 /**
117 * Returns the replacement string.
118 */
119 @Override
120 public String toString()
121 {
122 return super.toString()+"["+_replacement+"]";
123 }
124 }