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 }