1 /*
   2  * Copyright (c) 1999, 2013, 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.io.FileNotFoundException;
  30 import java.net.URL;
  31 import java.net.URLConnection;
  32 import java.util.HashMap;
  33 import java.util.jar.JarFile;
  34 import java.security.Permission;
  35 import sun.net.util.URLUtil;
  36 
  37 /* A factory for cached JAR file. This class is used to both retrieve
  38  * and cache Jar files.
  39  *
  40  * @author Benjamin Renaud
  41  * @since 1.2
  42  */
  43 class JarFileFactory implements URLJarFile.URLJarFileCloseController {
  44 
  45     /* the url to file cache */
  46     private static final HashMap<String, JarFile> fileCache = new HashMap<>();
  47 
  48     /* the file to url cache */
  49     private static final HashMap<JarFile, URL> urlCache = new HashMap<>();
  50 
  51     private static final JarFileFactory instance = new JarFileFactory();
  52 
  53     private JarFileFactory() { }
  54 
  55     public static JarFileFactory getInstance() {
  56         return instance;
  57     }
  58 
  59     URLConnection getConnection(JarFile jarFile) throws IOException {
  60         URL u;
  61         synchronized (instance) {
  62             u = urlCache.get(jarFile);
  63         }
  64         if (u != null)
  65             return u.openConnection();
  66 
  67         return null;
  68     }
  69 
  70     public JarFile get(URL url) throws IOException {
  71         return get(url, true);
  72     }
  73 
  74     JarFile get(URL url, boolean useCaches) throws IOException {
  75         if (url.getProtocol().equalsIgnoreCase("file")) {
  76             // Deal with UNC pathnames specially. See 4180841
  77 
  78             String host = url.getHost();
  79             if (host != null && !host.isEmpty() &&
  80                 !host.equalsIgnoreCase("localhost")) {
  81 
  82                 url = new URL("file", "", "//" + host + url.getPath());
  83             }
  84         }
  85 
  86         JarFile result;
  87         JarFile local_result;
  88 
  89         if (useCaches) {
  90             synchronized (instance) {
  91                 result = getCachedJarFile(url);
  92             }
  93             if (result == null) {
  94                 local_result = URLJarFile.getJarFile(url, this);
  95                 synchronized (instance) {
  96                     result = getCachedJarFile(url);
  97                     if (result == null) {
  98                         fileCache.put(urlKey(url), local_result);
  99                         urlCache.put(local_result, url);
 100                         result = local_result;
 101                     } else {
 102                         if (local_result != null) {
 103                             local_result.close();
 104                         }
 105                     }
 106                 }
 107             }
 108         } else {
 109             result = URLJarFile.getJarFile(url, this);
 110         }
 111         if (result == null)
 112             throw new FileNotFoundException(url.toString());
 113 
 114         return result;
 115     }
 116 
 117     /**
 118      * Callback method of the URLJarFileCloseController to
 119      * indicate that the JarFile is close. This way we can
 120      * remove the JarFile from the cache
 121      */
 122     public void close(JarFile jarFile) {
 123         synchronized (instance) {
 124             URL urlRemoved = urlCache.remove(jarFile);
 125             if (urlRemoved != null)
 126                 fileCache.remove(urlKey(urlRemoved));
 127         }
 128     }
 129 
 130     private JarFile getCachedJarFile(URL url) {
 131         assert Thread.holdsLock(instance);
 132         JarFile result = fileCache.get(urlKey(url));
 133 
 134         /* if the JAR file is cached, the permission will always be there */
 135         if (result != null) {
 136             Permission perm = getPermission(result);
 137             if (perm != null) {
 138                 SecurityManager sm = System.getSecurityManager();
 139                 if (sm != null) {
 140                     try {
 141                         sm.checkPermission(perm);
 142                     } catch (SecurityException se) {
 143                         // fallback to checkRead/checkConnect for pre 1.2
 144                         // security managers
 145                         if ((perm instanceof java.io.FilePermission) &&
 146                             perm.getActions().indexOf("read") != -1) {
 147                             sm.checkRead(perm.getName());
 148                         } else if ((perm instanceof
 149                             java.net.SocketPermission) &&
 150                             perm.getActions().indexOf("connect") != -1) {
 151                             sm.checkConnect(url.getHost(), url.getPort());
 152                         } else {
 153                             throw se;
 154                         }
 155                     }
 156                 }
 157             }
 158         }
 159         return result;
 160     }
 161 
 162     private String urlKey(URL url) {
 163         String urlstr =  URLUtil.urlNoFragString(url);
 164         if ("runtime".equals(url.getRef())) urlstr += "#runtime";
 165         return urlstr;
 166     }
 167 
 168     private Permission getPermission(JarFile jarFile) {
 169         try {
 170             URLConnection uc = getConnection(jarFile);
 171             if (uc != null)
 172                 return uc.getPermission();
 173         } catch (IOException ioe) {
 174             // gulp
 175         }
 176 
 177         return null;
 178     }
 179 }