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/*
* Copyright (c) 2013, 2018, 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 java.lang.invoke;
import sun.util.logging.PlatformLogger;
import java.io.FilePermission;
import java.nio.file.Files;
import java.nio.file.InvalidPathException;
import java.nio.file.Path;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Objects;
import java.util.concurrent.atomic.AtomicBoolean;
/**
* Helper class used by InnerClassLambdaMetafactory to log generated classes
*
* @implNote
* <p> Because this class is called by LambdaMetafactory, make use
* of lambda lead to recursive calls cause stack overflow.
*/
final class ProxyClassesDumper {
private static final char[] HEX = {
'0', '1', '2', '3', '4', '5', '6', '7',
'8', '9', 'A', 'B', 'C', 'D', 'E', 'F'
};
private static final char[] BAD_CHARS = {
'\\', ':', '*', '?', '"', '<', '>', '|'
};
private static final String[] REPLACEMENT = {
"%5C", "%3A", "%2A", "%3F", "%22", "%3C", "%3E", "%7C"
};
private final Path dumpDir;
public static ProxyClassesDumper getInstance(String path) {
if (null == path) {
return null;
}
try {
path = path.trim();
final Path dir = Path.of(path.isEmpty() ? "." : path);
AccessController.doPrivileged(new PrivilegedAction<>() {
@Override
public Void run() {
validateDumpDir(dir);
return null;
}
}, null, new FilePermission("<<ALL FILES>>", "read, write"));
return new ProxyClassesDumper(dir);
} catch (InvalidPathException ex) {
PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
.warning("Path " + path + " is not valid - dumping disabled", ex);
} catch (IllegalArgumentException iae) {
PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
.warning(iae.getMessage() + " - dumping disabled");
}
return null;
}
private ProxyClassesDumper(Path path) {
dumpDir = Objects.requireNonNull(path);
}
private static void validateDumpDir(Path path) {
if (!Files.exists(path)) {
throw new IllegalArgumentException("Directory " + path + " does not exist");
} else if (!Files.isDirectory(path)) {
throw new IllegalArgumentException("Path " + path + " is not a directory");
} else if (!Files.isWritable(path)) {
throw new IllegalArgumentException("Directory " + path + " is not writable");
}
}
public static String encodeForFilename(String className) {
final int len = className.length();
StringBuilder sb = new StringBuilder(len);
for (int i = 0; i < len; i++) {
char c = className.charAt(i);
// control characters
if (c <= 31) {
sb.append('%');
sb.append(HEX[c >> 4 & 0x0F]);
sb.append(HEX[c & 0x0F]);
} else {
int j = 0;
for (; j < BAD_CHARS.length; j++) {
if (c == BAD_CHARS[j]) {
sb.append(REPLACEMENT[j]);
break;
}
}
if (j >= BAD_CHARS.length) {
sb.append(c);
}
}
}
return sb.toString();
}
public void dumpClass(String className, final byte[] classBytes) {
Path file;
try {
file = dumpDir.resolve(encodeForFilename(className) + ".class");
} catch (InvalidPathException ex) {
PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
.warning("Invalid path for class " + className);
return;
}
try {
Path dir = file.getParent();
Files.createDirectories(dir);
Files.write(file, classBytes);
} catch (Exception ignore) {
PlatformLogger.getLogger(ProxyClassesDumper.class.getName())
.warning("Exception writing to path at " + file.toString());
// simply don't care if this operation failed
}
}
}
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