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/*
* Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package javac.internal.jrtfs;
import java.io.*;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.channels.*;
import java.nio.file.*;
import java.nio.file.DirectoryStream.Filter;
import java.nio.file.attribute.*;
import java.nio.file.spi.FileSystemProvider;
import java.net.URI;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;
import java.util.Set;
import java.util.concurrent.ExecutorService;
/**
* File system provider for jrt file systems. Conditionally creates jrt fs on
* .jimage file or exploded modules directory of underlying JDK.
*
* @implNote This class needs to maintain JDK 8 source compatibility.
*
* It is used internally in the JDK to implement jimage/jrtfs access,
* but also compiled and delivered as part of the jrtfs.jar to support access
* to the jimage file provided by the shipped JDK by tools running on JDK 8.
*/
public final class JrtFileSystemProvider extends FileSystemProvider {
private volatile FileSystem theFileSystem;
public JrtFileSystemProvider() {
}
@Override
public String getScheme() {
return "jrt";
}
/**
* Need RuntimePermission "accessSystemModules" to create or get jrt:/
*/
private void checkPermission() {
@SuppressWarnings("removal")
SecurityManager sm = System.getSecurityManager();
if (sm != null) {
RuntimePermission perm = new RuntimePermission("accessSystemModules");
sm.checkPermission(perm);
}
}
private void checkUri(URI uri) {
if (!uri.getScheme().equalsIgnoreCase(getScheme())) {
throw new IllegalArgumentException("URI does not match this provider");
}
if (uri.getAuthority() != null) {
throw new IllegalArgumentException("Authority component present");
}
if (uri.getPath() == null) {
throw new IllegalArgumentException("Path component is undefined");
}
if (!uri.getPath().equals("/")) {
throw new IllegalArgumentException("Path component should be '/'");
}
if (uri.getQuery() != null) {
throw new IllegalArgumentException("Query component present");
}
if (uri.getFragment() != null) {
throw new IllegalArgumentException("Fragment component present");
}
}
@Override
public FileSystem newFileSystem(URI uri, Map env)
throws IOException {
Objects.requireNonNull(env);
checkPermission();
checkUri(uri);
// ANDROIDIDE-CHANGED: Do not check for java.home property and directly return new file system instance.
return new JrtFileSystem(this, env);
}
private static final String JRT_FS_JAR = "jrt-fs.jar";
private FileSystem newFileSystem(String targetHome, URI uri, Map env)
throws IOException {
Objects.requireNonNull(targetHome);
Path jrtfs = FileSystems.getDefault().getPath(targetHome, "lib", JRT_FS_JAR);
if (Files.notExists(jrtfs)) {
throw new IOException(jrtfs.toString() + " not exist");
}
Map newEnv = new HashMap<>(env);
newEnv.remove("java.home");
ClassLoader cl = newJrtFsLoader(jrtfs);
try {
Class c = Class.forName(JrtFileSystemProvider.class.getName(), false, cl);
@SuppressWarnings("deprecation")
Object tmp = c.newInstance();
return ((FileSystemProvider)tmp).newFileSystem(uri, newEnv);
} catch (ClassNotFoundException |
IllegalAccessException |
InstantiationException e) {
throw new IOException(e);
}
}
private static class JrtFsLoader extends URLClassLoader {
JrtFsLoader(URL[] urls) {
super(urls);
}
@Override
protected Class loadClass(String cn, boolean resolve)
throws ClassNotFoundException
{
Class c = findLoadedClass(cn);
if (c == null) {
URL u = findResource(cn.replace('.', '/') + ".class");
if (u != null) {
c = findClass(cn);
} else {
return super.loadClass(cn, resolve);
}
}
if (resolve)
resolveClass(c);
return c;
}
}
@SuppressWarnings("removal")
private static URLClassLoader newJrtFsLoader(Path jrtfs) {
final URL url;
try {
url = jrtfs.toUri().toURL();
} catch (MalformedURLException mue) {
throw new IllegalArgumentException(mue);
}
final URL[] urls = new URL[] { url };
return AccessController.doPrivileged(
new PrivilegedAction() {
@Override
public URLClassLoader run() {
return new JrtFsLoader(urls);
}
}
);
}
@Override
public Path getPath(URI uri) {
checkPermission();
if (!uri.getScheme().equalsIgnoreCase(getScheme())) {
throw new IllegalArgumentException("URI does not match this provider");
}
if (uri.getAuthority() != null) {
throw new IllegalArgumentException("Authority component present");
}
if (uri.getQuery() != null) {
throw new IllegalArgumentException("Query component present");
}
if (uri.getFragment() != null) {
throw new IllegalArgumentException("Fragment component present");
}
String path = uri.getPath();
if (path == null || path.charAt(0) != '/' || path.contains("..")) {
throw new IllegalArgumentException("Invalid path component");
}
return getTheFileSystem().getPath("/modules" + path);
}
private FileSystem getTheFileSystem() {
checkPermission();
FileSystem fs = this.theFileSystem;
if (fs == null) {
synchronized (this) {
fs = this.theFileSystem;
if (fs == null) {
try {
this.theFileSystem = fs = new JrtFileSystem(this, null);
} catch (IOException ioe) {
throw new InternalError(ioe);
}
}
}
}
return fs;
}
@Override
public FileSystem getFileSystem(URI uri) {
checkPermission();
checkUri(uri);
return getTheFileSystem();
}
// Checks that the given file is a JrtPath
static final JrtPath toJrtPath(Path path) {
Objects.requireNonNull(path, "path");
if (!(path instanceof JrtPath)) {
throw new ProviderMismatchException();
}
return (JrtPath) path;
}
@Override
public void checkAccess(Path path, AccessMode... modes) throws IOException {
toJrtPath(path).checkAccess(modes);
}
@Override
public Path readSymbolicLink(Path link) throws IOException {
return toJrtPath(link).readSymbolicLink();
}
@Override
public void copy(Path src, Path target, CopyOption... options)
throws IOException {
toJrtPath(src).copy(toJrtPath(target), options);
}
@Override
public void createDirectory(Path path, FileAttribute... attrs)
throws IOException {
toJrtPath(path).createDirectory(attrs);
}
@Override
public final void delete(Path path) throws IOException {
toJrtPath(path).delete();
}
@Override
@SuppressWarnings("unchecked")
public V
getFileAttributeView(Path path, Class type, LinkOption... options) {
return JrtFileAttributeView.get(toJrtPath(path), type, options);
}
@Override
public FileStore getFileStore(Path path) throws IOException {
return toJrtPath(path).getFileStore();
}
@Override
public boolean isHidden(Path path) {
return toJrtPath(path).isHidden();
}
@Override
public boolean isSameFile(Path path, Path other) throws IOException {
return toJrtPath(path).isSameFile(other);
}
@Override
public void move(Path src, Path target, CopyOption... options)
throws IOException {
toJrtPath(src).move(toJrtPath(target), options);
}
@Override
public AsynchronousFileChannel newAsynchronousFileChannel(Path path,
Set options,
ExecutorService exec,
FileAttribute... attrs)
throws IOException {
throw new UnsupportedOperationException();
}
@Override
public SeekableByteChannel newByteChannel(Path path,
Set options,
FileAttribute... attrs)
throws IOException {
return toJrtPath(path).newByteChannel(options, attrs);
}
@Override
public DirectoryStream newDirectoryStream(
Path path, Filter filter) throws IOException {
return toJrtPath(path).newDirectoryStream(filter);
}
@Override
public FileChannel newFileChannel(Path path,
Set options,
FileAttribute... attrs)
throws IOException {
return toJrtPath(path).newFileChannel(options, attrs);
}
@Override
public InputStream newInputStream(Path path, OpenOption... options)
throws IOException {
return toJrtPath(path).newInputStream(options);
}
@Override
public OutputStream newOutputStream(Path path, OpenOption... options)
throws IOException {
return toJrtPath(path).newOutputStream(options);
}
@Override
@SuppressWarnings("unchecked") // Cast to A
public A
readAttributes(Path path, Class type, LinkOption... options)
throws IOException {
if (type == BasicFileAttributes.class || type == JrtFileAttributes.class) {
return (A) toJrtPath(path).getAttributes(options);
}
return null;
}
@Override
public Map
readAttributes(Path path, String attribute, LinkOption... options)
throws IOException {
return toJrtPath(path).readAttributes(attribute, options);
}
@Override
public void setAttribute(Path path, String attribute,
Object value, LinkOption... options)
throws IOException {
toJrtPath(path).setAttribute(attribute, value, options);
}
}