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/*
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*
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* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can
* obtain a copy of the License at
* https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
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* language governing permissions and limitations under the License.
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* file and include the License file at packager/legal/LICENSE.txt.
*
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* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
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*/
// Portions Copyright [2019-2022] Payara Foundation and/or affiliates
// Payara Foundation and/or its affiliates elects to include this software in this distribution under the GPL Version 2 license
package org.glassfish.appclient.client.acc;
import org.glassfish.appclient.common.ClientClassLoaderDelegate;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.lang.instrument.ClassFileTransformer;
import java.lang.instrument.IllegalClassFormatException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLClassLoader;
import java.security.*;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.ListIterator;
import java.util.function.Consumer;
/**
*
* @author tjquinn
*/
public class ACCClassLoader extends URLClassLoader {
private static final String AGENT_LOADER_CLASS_NAME =
"org.glassfish.appclient.client.acc.agent.ACCAgentClassLoader";
private static ACCClassLoader instance = null;
private ACCClassLoader shadow = null;
private boolean shouldTransform = false;
private final List transformers = Collections.synchronizedList(new ArrayList<>());
private ClientClassLoaderDelegate clientCLDelegate;
public static synchronized ACCClassLoader newInstance(ClassLoader parent, final boolean shouldTransform) {
if (instance != null) {
throw new IllegalStateException("already set");
}
ClassLoader currentClassLoader = Thread.currentThread().getContextClassLoader();
boolean currentCLWasAgentCL = currentClassLoader.getClass().getName().equals(AGENT_LOADER_CLASS_NAME);
ClassLoader parentForACCCL = currentCLWasAgentCL ? currentClassLoader.getParent() : currentClassLoader;
PrivilegedAction action = () -> new ACCClassLoader(userClassPath(), parentForACCCL,
shouldTransform);
instance = AccessController.doPrivileged(action);
if (currentCLWasAgentCL) {
try {
adjustACCAgentClassLoaderParent(instance);
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
return instance;
}
public static ACCClassLoader instance() {
return instance;
}
private static void adjustACCAgentClassLoaderParent(final ACCClassLoader instance)
throws NoSuchFieldException, IllegalArgumentException, IllegalAccessException {
ClassLoader systemClassLoader = ClassLoader.getSystemClassLoader();
if (systemClassLoader.getClass().getName().equals(AGENT_LOADER_CLASS_NAME)) {
if (systemClassLoader instanceof Consumer) {
@SuppressWarnings("unchecked")
Consumer consumerOfClassLoader = (Consumer) systemClassLoader;
consumerOfClassLoader.accept(instance);
System.setProperty("org.glassfish.appclient.acc.agentLoaderDone", "true");
}
}
}
private static URL[] userClassPath() {
URI GFSystemURI = GFSystemURI();
List result = classPathToURLs(System.getProperty("java.class.path"));
for (ListIterator it = result.listIterator(); it.hasNext(); ) {
final URL url = it.next();
try {
if (url.toURI().equals(GFSystemURI)) {
it.remove();
}
} catch (URISyntaxException ex) {
throw new RuntimeException(ex);
}
}
result.addAll(classPathToURLs(System.getenv("APPCPATH")));
return result.toArray(new URL[result.size()]);
}
private static URI GFSystemURI() {
try {
Class agentClass = Class.forName("org.glassfish.appclient.client.acc.agent.AppClientContainerAgent");
return agentClass.getProtectionDomain().getCodeSource().getLocation().toURI().normalize();
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
private static List classPathToURLs(final String classPath) {
if (classPath == null) {
return Collections.emptyList();
}
List result = new ArrayList<>();
try {
for (String classPathElement : classPath.split(File.pathSeparator)) {
result.add(new File(classPathElement).toURI().normalize().toURL());
}
return result;
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
public ACCClassLoader(ClassLoader parent, final boolean shouldTransform) {
super(new URL[0], parent);
this.shouldTransform = shouldTransform;
clientCLDelegate = new ClientClassLoaderDelegate(this);
}
public ACCClassLoader(URL[] urls, ClassLoader parent) {
super(urls, parent);
clientCLDelegate = new ClientClassLoaderDelegate(this);
}
private ACCClassLoader(URL[] urls, ClassLoader parent, boolean shouldTransform) {
this(urls, parent);
this.shouldTransform = shouldTransform;
}
public synchronized void appendURL(final URL url) {
addURL(url);
if (shadow != null) {
shadow.addURL(url);
}
}
public void addTransformer(final ClassFileTransformer xf) {
transformers.add(xf);
}
public void setShouldTransform(final boolean shouldTransform) {
this.shouldTransform = shouldTransform;
}
synchronized ACCClassLoader shadow() {
if (shadow == null) {
PrivilegedAction action = () -> new ACCClassLoader(getURLs(), getParent());
shadow = AccessController.doPrivileged(action);
}
return shadow;
}
@Override
protected Class findClass(String name) throws ClassNotFoundException {
if ( ! shouldTransform) {
return super.findClass(name);
}
final ACCClassLoader s = shadow();
return copyClass(s.findClassUnshadowed(name));
}
private Class copyClass(final Class c) throws ClassNotFoundException {
String name = c.getName();
ProtectionDomain pd = c.getProtectionDomain();
byte[] bytecode = readByteCode(name);
for (ClassFileTransformer xf : transformers) {
try {
bytecode = xf.transform(this, name, null, pd, bytecode);
} catch (IllegalClassFormatException ex) {
throw new ClassNotFoundException(name, ex);
}
}
return defineClass(name, bytecode, 0, bytecode.length, pd);
}
private Class findClassUnshadowed(String name) throws ClassNotFoundException {
return super.findClass(name);
}
private byte[] readByteCode(final String className) throws ClassNotFoundException {
final String resourceName = className.replace('.', '/') + ".class";
try (InputStream is = getResourceAsStream(resourceName);
ByteArrayOutputStream baos = new ByteArrayOutputStream()) {
if (is == null) {
throw new ClassNotFoundException(className);
}
final byte[] buffer = new byte[8196];
int bytesRead;
while ( (bytesRead = is.read(buffer)) != -1) {
baos.write(buffer, 0, bytesRead);
}
return baos.toByteArray();
} catch (IOException ex) {
throw new ClassNotFoundException(className, ex);
}
}
@Override
protected PermissionCollection getPermissions(CodeSource codesource) {
if (System.getSecurityManager() == null)
return super.getPermissions(codesource);
//when security manager is enabled, find the declared permissions
if (clientCLDelegate.getCachedPerms(codesource) != null)
return clientCLDelegate.getCachedPerms(codesource);
return clientCLDelegate.getPermissions(codesource,
super.getPermissions(codesource));
}
public void processDeclaredPermissions() {
if (clientCLDelegate == null)
clientCLDelegate = new ClientClassLoaderDelegate(this);
}
}
