1 /*
   2  * Copyright (c) 1999, 2006, 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.*;
  29 import java.net.*;
  30 import java.util.*;
  31 import java.util.jar.*;
  32 import java.util.zip.ZipFile;
  33 import java.security.Permission;
  34 
  35 /* A factory for cached JAR file. This class is used to both retrieve
  36  * and cache Jar files.
  37  *
  38  * @author Benjamin Renaud
  39  * @since JDK1.2
  40  */
  41 class JarFileFactory implements URLJarFile.URLJarFileCloseController {
  42 
  43     /* the url to file cache */
  44     private static HashMap fileCache = new HashMap();
  45 
  46     /* the file to url cache */
  47     private static HashMap urlCache = new HashMap();
  48 
  49     URLConnection getConnection(JarFile jarFile) throws IOException {
  50         URL u = (URL)urlCache.get(jarFile);
  51         if (u != null)
  52             return u.openConnection();
  53 
  54         return null;
  55     }
  56 
  57     public JarFile get(URL url) throws IOException {
  58         return get(url, true);
  59     }
  60 
  61     JarFile get(URL url, boolean useCaches) throws IOException {
  62         if (url.getProtocol().equalsIgnoreCase("file")) {
  63             // Deal with UNC pathnames specially. See 4180841
  64 
  65             String host = url.getHost();
  66             if (host != null && !host.equals("") &&
  67                 !host.equalsIgnoreCase("localhost")) {
  68 
  69                 url = new URL("file", "", "//" + host + url.getPath());
  70             }
  71         }
  72 
  73         JarFile result = null;
  74         JarFile local_result = null;
  75 
  76         if (useCaches) {
  77             synchronized (this) {
  78                 result = getCachedJarFile(url);
  79             }
  80             if (result == null) {
  81                 local_result = URLJarFile.getJarFile(url, this);
  82                 synchronized (this) {
  83                     result = getCachedJarFile(url);
  84                     if (result == null) {
  85                         fileCache.put(url, local_result);
  86                         urlCache.put(local_result, url);
  87                         result = local_result;
  88                     } else {
  89                         if (local_result != null) {
  90                             local_result.close();
  91                         }
  92                     }
  93                 }
  94             }
  95         } else {
  96             result = URLJarFile.getJarFile(url, this);
  97         }
  98         if (result == null)
  99             throw new FileNotFoundException(url.toString());
 100 
 101         return result;
 102     }
 103 
 104     /**
 105      * Callback method of the URLJarFileCloseController to
 106      * indicate that the JarFile is close. This way we can
 107      * remove the JarFile from the cache
 108      */
 109     public void close(JarFile jarFile) {
 110         URL urlRemoved = (URL) urlCache.remove(jarFile);
 111         if( urlRemoved != null) {
 112                 fileCache.remove(urlRemoved);
 113         }
 114     }
 115 
 116     private JarFile getCachedJarFile(URL url) {
 117         JarFile result = (JarFile)fileCache.get(url);
 118 
 119         /* if the JAR file is cached, the permission will always be there */
 120         if (result != null) {
 121             Permission perm = getPermission(result);
 122             if (perm != null) {
 123                 SecurityManager sm = System.getSecurityManager();
 124                 if (sm != null) {
 125                     try {
 126                         sm.checkPermission(perm);
 127                     } catch (SecurityException se) {
 128                         // fallback to checkRead/checkConnect for pre 1.2
 129                         // security managers
 130                         if ((perm instanceof java.io.FilePermission) &&
 131                             perm.getActions().indexOf("read") != -1) {
 132                             sm.checkRead(perm.getName());
 133                         } else if ((perm instanceof
 134                             java.net.SocketPermission) &&
 135                             perm.getActions().indexOf("connect") != -1) {
 136                             sm.checkConnect(url.getHost(), url.getPort());
 137                         } else {
 138                             throw se;
 139                         }
 140                     }
 141                 }
 142             }
 143         }
 144         return result;
 145     }
 146 
 147     private Permission getPermission(JarFile jarFile) {
 148         try {
 149             URLConnection uc = (URLConnection)getConnection(jarFile);
 150             if (uc != null)
 151                 return uc.getPermission();
 152         } catch (IOException ioe) {
 153             // gulp
 154         }
 155 
 156         return null;
 157     }
 158 }