/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.commons.weaver.privilizer;
import java.io.InputStream;
import java.lang.annotation.ElementType;
import java.util.ArrayList;
import java.util.List;
import org.apache.commons.io.IOUtils;
import org.apache.commons.weaver.model.ScanRequest;
import org.apache.commons.weaver.model.Scanner;
import org.apache.commons.weaver.model.WeavableClass;
import org.apache.commons.weaver.model.WeaveEnvironment;
import org.apache.commons.weaver.model.WeaveInterest;
import org.apache.commons.weaver.spi.Cleaner;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.Opcodes;
/**
* Removes classes privilized with a different policy.
*/
public class PrivilizerCleaner implements Cleaner {
@Override
public boolean clean(final WeaveEnvironment environment, final Scanner scanner) {
final Privilizer privilizer = new Privilizer(environment);
final List<String> toDelete = new ArrayList<String>();
final ScanRequest scanRequest = new ScanRequest().add(WeaveInterest.of(Privilized.class, ElementType.TYPE));
environment.debug("Cleaning classes privilized with policy other than %s", privilizer.policy);
for (final WeavableClass<?> weavableClass : scanner.scan(scanRequest).getClasses().with(Privilized.class)) {
final Policy privilizedPolicy = Policy.valueOf(weavableClass.getAnnotation(Privilized.class).value());
if (privilizedPolicy == privilizer.policy) {
continue;
}
final String className = weavableClass.getTarget().getName();
environment.debug("Class %s privilized with %s; deleting.", className, privilizedPolicy);
InputStream bytecode = null;
try {
bytecode = privilizer.env.getClassfile(className).getInputStream();
final ClassReader classReader = new ClassReader(bytecode);
classReader.accept(new ClassVisitor(Opcodes.ASM4) {
@Override
public void visit(final int version, final int access, final String name, final String signature,
final String superName, final String[] interfaces) {
toDelete.add(name);
}
@Override
public void visitInnerClass(final String name, final String outerName, final String innerName,
final int access) {
if (toDelete.contains(outerName)) {
toDelete.add(name);
}
}
}, ClassReader.SKIP_CODE + ClassReader.SKIP_DEBUG + ClassReader.SKIP_FRAMES);
} catch (final Exception e) {
throw new RuntimeException(e);
} finally {
IOUtils.closeQuietly(bytecode);
}
}
boolean result = false;
for (final String className : toDelete) {
final String resourcePath = toResourcePath(className);
final boolean success = environment.deleteResource(resourcePath);
environment.debug("Deletion of resource %s was %ssuccessful.", resourcePath, success ? "" : "un");
result |= success;
}
return result;
}
private static String toResourcePath(final String className) {
return className.replace('.', '/') + ".class";
}
}