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/*
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* Copyright (c) 2013, 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 java.lang.invoke;
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import sun.util.logging.PlatformLogger;
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import java.io.FilePermission;
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import java.nio.file.Files;
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import java.nio.file.InvalidPathException;
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import java.nio.file.Path;
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import java.nio.file.Paths;
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import java.security.AccessController;
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import java.security.PrivilegedAction;
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import java.util.Objects;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* Helper class used by InnerClassLambdaMetafactory to log generated classes
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*
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* @implNote
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* <p> Because this class is called by LambdaMetafactory, make use
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* of lambda lead to recursive calls cause stack overflow.
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*/
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final class ProxyClassesDumper {
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private static final char[] HEX = {
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
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};
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private static final char[] BAD_CHARS = {
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'\\', ':', '*', '?', '"', '<', '>', '|'
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};
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private static final String[] REPLACEMENT = {
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"%5C", "%3A", "%2A", "%3F", "%22", "%3C", "%3E", "%7C"
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};
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private final Path dumpDir;
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public static ProxyClassesDumper getInstance(String path) {
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if (null == path) {
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return null;
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}
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try {
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path = path.trim();
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final Path dir = Paths.get(path.length() == 0 ? "." : path);
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AccessController.doPrivileged(new PrivilegedAction<Void>() {
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@Override
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public Void run() {
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validateDumpDir(dir);
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return null;
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}
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}, null, new FilePermission("<<ALL FILES>>", "read, write"));
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return new ProxyClassesDumper(dir);
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} catch (InvalidPathException ex) {
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PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
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.warning("Path " + path + " is not valid - dumping disabled", ex);
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} catch (IllegalArgumentException iae) {
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PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
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.warning(iae.getMessage() + " - dumping disabled");
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}
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return null;
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}
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private ProxyClassesDumper(Path path) {
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dumpDir = Objects.requireNonNull(path);
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}
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private static void validateDumpDir(Path path) {
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if (!Files.exists(path)) {
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throw new IllegalArgumentException("Directory " + path + " does not exist");
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} else if (!Files.isDirectory(path)) {
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throw new IllegalArgumentException("Path " + path + " is not a directory");
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} else if (!Files.isWritable(path)) {
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throw new IllegalArgumentException("Directory " + path + " is not writable");
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}
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}
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public static String encodeForFilename(String className) {
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final int len = className.length();
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StringBuilder sb = new StringBuilder(len);
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for (int i = 0; i < len; i++) {
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char c = className.charAt(i);
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// control characters
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if (c <= 31) {
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sb.append('%');
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sb.append(HEX[c >> 4 & 0x0F]);
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sb.append(HEX[c & 0x0F]);
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} else {
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int j = 0;
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for (; j < BAD_CHARS.length; j++) {
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if (c == BAD_CHARS[j]) {
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sb.append(REPLACEMENT[j]);
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break;
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}
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}
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if (j >= BAD_CHARS.length) {
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sb.append(c);
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}
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}
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}
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return sb.toString();
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}
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public void dumpClass(String className, final byte[] classBytes) {
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Path file;
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try {
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file = dumpDir.resolve(encodeForFilename(className) + ".class");
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} catch (InvalidPathException ex) {
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PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
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.warning("Invalid path for class " + className);
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return;
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}
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try {
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Path dir = file.getParent();
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Files.createDirectories(dir);
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Files.write(file, classBytes);
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} catch (Exception ignore) {
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PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
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.warning("Exception writing to path at " + file.toString());
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// simply don't care if this operation failed
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}
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}
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}
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