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      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 
     26 package sun.net.www.protocol.jar;
     27 
     28 import java.io.IOException;
     29 import java.net.*;
     30 import sun.net.www.ParseUtil;
     31 
     32 /*
     33  * Jar URL Handler
     34  */
     35 public 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     @SuppressWarnings("deprecation")
    127     protected void parseURL(URL url, String spec,
    128                             int start, int limit) {
    129         String file = null;
    130         String ref = null;
    131         // first figure out if there is an anchor
    132         int refPos = spec.indexOf('#', limit);
    133         boolean refOnly = refPos == start;
    134         if (refPos > -1) {
    135             ref = spec.substring(refPos + 1, spec.length());
    136             if (refOnly) {
    137                 file = url.getFile();
    138             }
    139         }
    140         // then figure out if the spec is
    141         // 1. absolute (jar:)
    142         // 2. relative (i.e. url + foo/bar/baz.ext)
    143         // 3. anchor-only (i.e. url + #foo), which we already did (refOnly)
    144         boolean absoluteSpec = false;
    145         if (spec.length() >= 4) {
    146             absoluteSpec = spec.substring(0, 4).equalsIgnoreCase("jar:");
    147         }
    148         spec = spec.substring(start, limit);
    149 
    150         if (absoluteSpec) {
    151             file = parseAbsoluteSpec(spec);
    152         } else if (!refOnly) {
    153             file = parseContextSpec(url, spec);
    154 
    155             // Canonize the result after the bangslash
    156             int bangSlash = indexOfBangSlash(file);
    157             String toBangSlash = file.substring(0, bangSlash);
    158             String afterBangSlash = file.substring(bangSlash);
    159             sun.net.www.ParseUtil canonizer = new ParseUtil();
    160             afterBangSlash = canonizer.canonizeString(afterBangSlash);
    161             file = toBangSlash + afterBangSlash;
    162         }
    163         setURL(url, "jar", "", -1, file, ref);
    164     }
    165 
    166     private String parseAbsoluteSpec(String spec) {
    167         URL url = null;
    168         int index = -1;
    169         // check for !/
    170         if ((index = indexOfBangSlash(spec)) == -1) {
    171             throw new NullPointerException("no !/ in spec");
    172         }
    173         // test the inner URL
    174         try {
    175             String innerSpec = spec.substring(0, index - 1);
    176             url = new URL(innerSpec);
    177         } catch (MalformedURLException e) {
    178             throw new NullPointerException("invalid url: " +
    179                                            spec + " (" + e + ")");
    180         }
    181         return spec;
    182     }
    183 
    184     private String parseContextSpec(URL url, String spec) {
    185         String ctxFile = url.getFile();
    186         // if the spec begins with /, chop up the jar back !/
    187         if (spec.startsWith("/")) {
    188             int bangSlash = indexOfBangSlash(ctxFile);
    189             if (bangSlash == -1) {
    190                 throw new NullPointerException("malformed " +
    191                                                "context url:" +
    192                                                url +
    193                                                ": no !/");
    194             }
    195             ctxFile = ctxFile.substring(0, bangSlash);
    196         }
    197         if (!ctxFile.endsWith("/") && (!spec.startsWith("/"))){
    198             // chop up the last component
    199             int lastSlash = ctxFile.lastIndexOf('/');
    200             if (lastSlash == -1) {
    201                 throw new NullPointerException("malformed " +
    202                                                "context url:" +
    203                                                url);
    204             }
    205             ctxFile = ctxFile.substring(0, lastSlash + 1);
    206         }
    207         return (ctxFile + spec);
    208     }
    209 }
    210