1 /*
2 * The Apache Software License, Version 1.1
3 *
4 * Copyright (c) 1999 The Apache Software Foundation. All rights
5 * reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
17 * distribution.
18 *
19 * 3. The end-user documentation included with the redistribution, if
20 * any, must include the following acknowlegement:
21 * "This product includes software developed by the
22 * Apache Software Foundation (http://www.apache.org/)."
23 * Alternately, this acknowlegement may appear in the software itself,
24 * if and wherever such third-party acknowlegements normally appear.
25 *
26 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
27 * Foundation" must not be used to endorse or promote products derived
28 * from this software without prior written permission. For written
29 * permission, please contact apache@apache.org.
30 *
31 * 5. Products derived from this software may not be called "Apache"
32 * nor may "Apache" appear in their names without prior written
33 * permission of the Apache Group.
34 *
35 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
39 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 * ====================================================================
48 *
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
53 *
54 * [Additional notices, if required by prior licensing conditions]
55 *
56 */
57
58
59 package org.apache.tomcat.util;
60
61 import java.net.URL;
62 import java.io.File;
63 import java.net.MalformedURLException;
64 import java.io.IOException;
65
66 /**
67 *
68 * @author James Todd [gonzo@eng.sun.com]
69 */
70
71 public class URLUtil {
72 public static URL resolve(String s)
73 throws MalformedURLException {
74 return resolve(s, null);
75 }
76
77 public static URL resolve(String s, URL url)
78 throws MalformedURLException {
79 URL resolve = null;
80
81 // construct a URL via the following heuristics:
82 //
83 // if arg contains ":/" then
84 // assume a valid uri
85 // else if url arg is specified
86 // construct uri
87 // else if an absolute path then
88 // construct file uri
89 // else
90 // construct file uri by prepending the
91 // working directory
92
93 if (s.indexOf("://") > -1 ||
94 s.indexOf("file:") > -1 ) {
95 resolve = new URL(s);
96 } else if (url != null) {
97 resolve = new URL(url, s);
98 } else if (s.startsWith(File.separator) ||
99 s.startsWith("/") ||
100 (s.length() >= 2 &&
101 Character.isLetter(s.charAt(0)) &&
102 s.charAt(1) == ':')) {
103 String fName = s;
104
105 try {
106 fName = (String)(new File(s)).getCanonicalPath();
107 } catch (NullPointerException npe) {
108 } catch (IOException npe) {
109 }
110
111 resolve = new URL("file", "", fName);
112 } else {
113 String path = System.getProperty("user.dir") +
114 File.separator + s;
115
116 resolve = new URL("file", "", path);
117 }
118
119 if (! resolve.getProtocol().equalsIgnoreCase(
120 org.apache.tomcat.core.Constants.Request.WAR) &&
121 resolve.getFile().toLowerCase().endsWith(
122 "." + Constants.MIME.WAR)) {
123 URL u = new URL(Constants.MIME.WAR + ":" +
124 resolve.toString());
125
126 resolve = u;
127 }
128
129 resolve = new URL(trim(resolve.toString(), ".", ".."));
130 resolve = new URL(trim(resolve.toString(), "./"));
131
132 return resolve;
133 }
134
135 private static String trim(String s, String t) {
136 return trim(s, t, null);
137 }
138
139 private static String trim(String s, String r, String t) {
140 while (s.endsWith(r) &&
141 ((t == null) ? true : (! s.endsWith(t)))) {
142 int i = s.length() - r.length();
143
144 s = s.substring(0, i);
145 }
146
147 return s;
148 }
149 }