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/*
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* Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package jdk.internal.jrtfs;
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import java.io.*;
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import java.net.MalformedURLException;
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import java.net.URL;
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import java.net.URLClassLoader;
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import java.nio.channels.*;
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import java.nio.file.*;
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import java.nio.file.DirectoryStream.Filter;
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import java.nio.file.attribute.*;
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import java.nio.file.spi.FileSystemProvider;
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import java.net.URI;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Objects;
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import java.util.Set;
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import java.util.concurrent.ExecutorService;
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/**
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* File system provider for jrt file systems. Conditionally creates jrt fs on
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* .jimage file or exploded modules directory of underlying JDK.
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*
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* @implNote This class needs to maintain JDK 8 source compatibility.
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*
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* It is used internally in the JDK to implement jimage/jrtfs access,
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* but also compiled and delivered as part of the jrtfs.jar to support access
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* to the jimage file provided by the shipped JDK by tools running on JDK 8.
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*/
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public final class JrtFileSystemProvider extends FileSystemProvider {
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private volatile FileSystem theFileSystem;
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public JrtFileSystemProvider() {
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}
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@Override
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public String getScheme() {
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return "jrt";
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}
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/**
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* Need FilePermission ${java.home}/-", "read" to create or get jrt:/
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*/
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private void checkPermission() {
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SecurityManager sm = System.getSecurityManager();
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if (sm != null) {
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String home = SystemImage.RUNTIME_HOME;
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FilePermission perm
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= new FilePermission(home + File.separator + "-", "read");
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sm.checkPermission(perm);
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}
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}
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private void checkUri(URI uri) {
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if (!uri.getScheme().equalsIgnoreCase(getScheme())) {
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throw new IllegalArgumentException("URI does not match this provider");
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}
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if (uri.getAuthority() != null) {
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throw new IllegalArgumentException("Authority component present");
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}
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if (uri.getPath() == null) {
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throw new IllegalArgumentException("Path component is undefined");
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}
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if (!uri.getPath().equals("/")) {
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throw new IllegalArgumentException("Path component should be '/'");
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}
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if (uri.getQuery() != null) {
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throw new IllegalArgumentException("Query component present");
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}
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if (uri.getFragment() != null) {
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throw new IllegalArgumentException("Fragment component present");
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}
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}
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@Override
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public FileSystem newFileSystem(URI uri, Map<String, ?> env)
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throws IOException {
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checkPermission();
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checkUri(uri);
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if (env != null && env.containsKey("java.home")) {
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return newFileSystem((String)env.get("java.home"), uri, env);
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} else {
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return new JrtFileSystem(this, env);
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}
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}
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private static final String JRT_FS_JAR = "jrt-fs.jar";
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private FileSystem newFileSystem(String targetHome, URI uri, Map<String, ?> env)
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throws IOException {
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Objects.requireNonNull(targetHome);
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Path jrtfs = FileSystems.getDefault().getPath(targetHome, JRT_FS_JAR);
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if (Files.notExists(jrtfs)) {
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throw new IOException(jrtfs.toString() + " not exist");
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}
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Map<String,?> newEnv = new HashMap<>(env);
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newEnv.remove("java.home");
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ClassLoader cl = newJrtFsLoader(jrtfs);
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try {
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Class<?> c = Class.forName(JrtFileSystemProvider.class.getName(), false, cl);
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return ((FileSystemProvider)c.newInstance()).newFileSystem(uri, newEnv);
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} catch (ClassNotFoundException |
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IllegalAccessException |
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InstantiationException e) {
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throw new IOException(e);
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}
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}
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private static class JrtFsLoader extends URLClassLoader {
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JrtFsLoader(URL[] urls) {
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super(urls);
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}
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@Override
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protected Class<?> loadClass(String cn, boolean resolve)
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throws ClassNotFoundException
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{
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Class<?> c = findLoadedClass(cn);
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if (c == null) {
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URL u = findResource(cn.replace('.', '/') + ".class");
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if (u != null) {
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c = findClass(cn);
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} else {
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return super.loadClass(cn, resolve);
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}
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}
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if (resolve)
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resolveClass(c);
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return c;
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}
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}
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private static URLClassLoader newJrtFsLoader(Path jrtfs) {
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final URL url;
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try {
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url = jrtfs.toUri().toURL();
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} catch (MalformedURLException mue) {
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throw new IllegalArgumentException(mue);
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}
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final URL[] urls = new URL[] { url };
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return AccessController.doPrivileged(
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new PrivilegedAction<URLClassLoader>() {
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@Override
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public URLClassLoader run() {
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return new JrtFsLoader(urls);
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}
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}
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);
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}
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@Override
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public Path getPath(URI uri) {
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checkPermission();
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if (!uri.getScheme().equalsIgnoreCase(getScheme())) {
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throw new IllegalArgumentException("URI does not match this provider");
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}
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if (uri.getAuthority() != null) {
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throw new IllegalArgumentException("Authority component present");
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}
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if (uri.getQuery() != null) {
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throw new IllegalArgumentException("Query component present");
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}
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if (uri.getFragment() != null) {
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throw new IllegalArgumentException("Fragment component present");
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}
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String path = uri.getPath();
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if (path == null || path.charAt(0) != '/') {
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throw new IllegalArgumentException("Invalid path component");
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}
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return getTheFileSystem().getPath(path);
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}
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private FileSystem getTheFileSystem() {
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checkPermission();
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FileSystem fs = this.theFileSystem;
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if (fs == null) {
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synchronized (this) {
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fs = this.theFileSystem;
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if (fs == null) {
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try {
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this.theFileSystem = fs = new JrtFileSystem(this, null);
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} catch (IOException ioe) {
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throw new InternalError(ioe);
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}
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}
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}
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}
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return fs;
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}
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@Override
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public FileSystem getFileSystem(URI uri) {
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checkPermission();
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checkUri(uri);
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return getTheFileSystem();
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}
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// Checks that the given file is a JrtPath
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static final JrtPath toJrtPath(Path path) {
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Objects.requireNonNull(path, "path");
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if (!(path instanceof JrtPath)) {
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throw new ProviderMismatchException();
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}
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return (JrtPath) path;
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}
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@Override
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public void checkAccess(Path path, AccessMode... modes) throws IOException {
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toJrtPath(path).checkAccess(modes);
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}
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@Override
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public Path readSymbolicLink(Path link) throws IOException {
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return toJrtPath(link).readSymbolicLink();
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}
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@Override
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public void copy(Path src, Path target, CopyOption... options)
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throws IOException {
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toJrtPath(src).copy(toJrtPath(target), options);
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}
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@Override
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public void createDirectory(Path path, FileAttribute<?>... attrs)
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throws IOException {
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toJrtPath(path).createDirectory(attrs);
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}
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@Override
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public final void delete(Path path) throws IOException {
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toJrtPath(path).delete();
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}
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@Override
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@SuppressWarnings("unchecked")
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public <V extends FileAttributeView> V
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getFileAttributeView(Path path, Class<V> type, LinkOption... options) {
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return JrtFileAttributeView.get(toJrtPath(path), type, options);
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}
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@Override
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public FileStore getFileStore(Path path) throws IOException {
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return toJrtPath(path).getFileStore();
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}
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@Override
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public boolean isHidden(Path path) {
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return toJrtPath(path).isHidden();
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}
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@Override
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public boolean isSameFile(Path path, Path other) throws IOException {
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return toJrtPath(path).isSameFile(other);
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}
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@Override
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public void move(Path src, Path target, CopyOption... options)
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throws IOException {
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toJrtPath(src).move(toJrtPath(target), options);
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}
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@Override
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public AsynchronousFileChannel newAsynchronousFileChannel(Path path,
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Set<? extends OpenOption> options,
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ExecutorService exec,
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FileAttribute<?>... attrs)
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throws IOException {
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throw new UnsupportedOperationException();
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}
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@Override
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public SeekableByteChannel newByteChannel(Path path,
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Set<? extends OpenOption> options,
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FileAttribute<?>... attrs)
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throws IOException {
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return toJrtPath(path).newByteChannel(options, attrs);
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}
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@Override
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public DirectoryStream<Path> newDirectoryStream(
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Path path, Filter<? super Path> filter) throws IOException {
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return toJrtPath(path).newDirectoryStream(filter);
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}
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@Override
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public FileChannel newFileChannel(Path path,
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Set<? extends OpenOption> options,
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FileAttribute<?>... attrs)
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throws IOException {
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return toJrtPath(path).newFileChannel(options, attrs);
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}
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@Override
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public InputStream newInputStream(Path path, OpenOption... options)
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throws IOException {
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return toJrtPath(path).newInputStream(options);
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}
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@Override
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public OutputStream newOutputStream(Path path, OpenOption... options)
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throws IOException {
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return toJrtPath(path).newOutputStream(options);
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}
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@Override
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@SuppressWarnings("unchecked") // Cast to A
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public <A extends BasicFileAttributes> A
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readAttributes(Path path, Class<A> type, LinkOption... options)
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throws IOException {
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if (type == BasicFileAttributes.class || type == JrtFileAttributes.class) {
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return (A) toJrtPath(path).getAttributes(options);
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}
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return null;
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}
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@Override
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public Map<String, Object>
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readAttributes(Path path, String attribute, LinkOption... options)
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throws IOException {
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return toJrtPath(path).readAttributes(attribute, options);
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}
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@Override
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public void setAttribute(Path path, String attribute,
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Object value, LinkOption... options)
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throws IOException {
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toJrtPath(path).setAttribute(attribute, value, options);
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}
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}
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