1/*
2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.  Oracle designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Oracle in the LICENSE file that accompanied this code.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 */
25
26package sun.net.www.protocol.jar;
27
28import java.io.IOException;
29import java.net.*;
30import sun.net.www.ParseUtil;
31
32/*
33 * Jar URL Handler
34 */
35public class Handler extends java.net.URLStreamHandler {
36
37    private static final String separator = "!/";
38
39    protected java.net.URLConnection openConnection(URL u)
40    throws IOException {
41        return new JarURLConnection(u, this);
42    }
43
44    private static int indexOfBangSlash(String spec) {
45        int indexOfBang = spec.length();
46        while((indexOfBang = spec.lastIndexOf('!', indexOfBang)) != -1) {
47            if ((indexOfBang != (spec.length() - 1)) &&
48                (spec.charAt(indexOfBang + 1) == '/')) {
49                return indexOfBang + 1;
50            } else {
51                indexOfBang--;
52            }
53        }
54        return -1;
55    }
56
57    /**
58     * Compare two jar URLs
59     */
60    @Override
61    protected boolean sameFile(URL u1, URL u2) {
62        if (!u1.getProtocol().equals("jar") || !u2.getProtocol().equals("jar"))
63            return false;
64
65        String file1 = u1.getFile();
66        String file2 = u2.getFile();
67        int sep1 = file1.indexOf(separator);
68        int sep2 = file2.indexOf(separator);
69
70        if (sep1 == -1 || sep2 == -1) {
71            return super.sameFile(u1, u2);
72        }
73
74        String entry1 = file1.substring(sep1 + 2);
75        String entry2 = file2.substring(sep2 + 2);
76
77        if (!entry1.equals(entry2))
78            return false;
79
80        URL enclosedURL1 = null, enclosedURL2 = null;
81        try {
82            enclosedURL1 = new URL(file1.substring(0, sep1));
83            enclosedURL2 = new URL(file2.substring(0, sep2));
84        } catch (MalformedURLException unused) {
85            return super.sameFile(u1, u2);
86        }
87
88        if (!super.sameFile(enclosedURL1, enclosedURL2)) {
89            return false;
90        }
91
92        return true;
93    }
94
95    @Override
96    protected int hashCode(URL u) {
97        int h = 0;
98
99        String protocol = u.getProtocol();
100        if (protocol != null)
101            h += protocol.hashCode();
102
103        String file = u.getFile();
104        int sep = file.indexOf(separator);
105
106        if (sep == -1)
107            return h + file.hashCode();
108
109        URL enclosedURL = null;
110        String fileWithoutEntry = file.substring(0, sep);
111        try {
112            enclosedURL = new URL(fileWithoutEntry);
113            h += enclosedURL.hashCode();
114        } catch (MalformedURLException unused) {
115            h += fileWithoutEntry.hashCode();
116        }
117
118        String entry = file.substring(sep + 2);
119        h += entry.hashCode();
120
121        return h;
122    }
123
124
125    @Override
126    protected void parseURL(URL url, String spec,
127                            int start, int limit) {
128        String file = null;
129        String ref = null;
130        // first figure out if there is an anchor
131        int refPos = spec.indexOf('#', limit);
132        boolean refOnly = refPos == start;
133        if (refPos > -1) {
134            ref = spec.substring(refPos + 1, spec.length());
135            if (refOnly) {
136                file = url.getFile();
137            }
138        }
139        // then figure out if the spec is
140        // 1. absolute (jar:)
141        // 2. relative (i.e. url + foo/bar/baz.ext)
142        // 3. anchor-only (i.e. url + #foo), which we already did (refOnly)
143        boolean absoluteSpec = false;
144        if (spec.length() >= 4) {
145            absoluteSpec = spec.substring(0, 4).equalsIgnoreCase("jar:");
146        }
147        spec = spec.substring(start, limit);
148
149        if (absoluteSpec) {
150            file = parseAbsoluteSpec(spec);
151        } else if (!refOnly) {
152            file = parseContextSpec(url, spec);
153
154            // Canonize the result after the bangslash
155            int bangSlash = indexOfBangSlash(file);
156            String toBangSlash = file.substring(0, bangSlash);
157            String afterBangSlash = file.substring(bangSlash);
158            sun.net.www.ParseUtil canonizer = new ParseUtil();
159            afterBangSlash = canonizer.canonizeString(afterBangSlash);
160            file = toBangSlash + afterBangSlash;
161        }
162        setURL(url, "jar", "", -1, file, ref);
163    }
164
165    private String parseAbsoluteSpec(String spec) {
166        URL url = null;
167        int index = -1;
168        // check for !/
169        if ((index = indexOfBangSlash(spec)) == -1) {
170            throw new NullPointerException("no !/ in spec");
171        }
172        // test the inner URL
173        try {
174            String innerSpec = spec.substring(0, index - 1);
175            url = new URL(innerSpec);
176        } catch (MalformedURLException e) {
177            throw new NullPointerException("invalid url: " +
178                                           spec + " (" + e + ")");
179        }
180        return spec;
181    }
182
183    private String parseContextSpec(URL url, String spec) {
184        String ctxFile = url.getFile();
185        // if the spec begins with /, chop up the jar back !/
186        if (spec.startsWith("/")) {
187            int bangSlash = indexOfBangSlash(ctxFile);
188            if (bangSlash == -1) {
189                throw new NullPointerException("malformed " +
190                                               "context url:" +
191                                               url +
192                                               ": no !/");
193            }
194            ctxFile = ctxFile.substring(0, bangSlash);
195        }
196        if (!ctxFile.endsWith("/") && (!spec.startsWith("/"))){
197            // chop up the last component
198            int lastSlash = ctxFile.lastIndexOf('/');
199            if (lastSlash == -1) {
200                throw new NullPointerException("malformed " +
201                                               "context url:" +
202                                               url);
203            }
204            ctxFile = ctxFile.substring(0, lastSlash + 1);
205        }
206        return (ctxFile + spec);
207    }
208}
209