001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.commons.weaver.privilizer; 020 021import java.io.InputStream; 022import java.lang.annotation.ElementType; 023import java.util.ArrayList; 024import java.util.List; 025 026import org.apache.commons.io.IOUtils; 027import org.apache.commons.weaver.model.ScanRequest; 028import org.apache.commons.weaver.model.Scanner; 029import org.apache.commons.weaver.model.WeavableClass; 030import org.apache.commons.weaver.model.WeaveEnvironment; 031import org.apache.commons.weaver.model.WeaveInterest; 032import org.apache.commons.weaver.spi.Cleaner; 033import org.objectweb.asm.ClassReader; 034import org.objectweb.asm.ClassVisitor; 035import org.objectweb.asm.Opcodes; 036 037/** 038 * Removes classes privilized with a different policy. 039 */ 040public class PrivilizerCleaner implements Cleaner { 041 042 @Override 043 public boolean clean(final WeaveEnvironment environment, final Scanner scanner) { 044 final Privilizer privilizer = new Privilizer(environment); 045 046 final List<String> toDelete = new ArrayList<String>(); 047 048 final ScanRequest scanRequest = new ScanRequest().add(WeaveInterest.of(Privilized.class, ElementType.TYPE)); 049 050 environment.debug("Cleaning classes privilized with policy other than %s", privilizer.policy); 051 for (final WeavableClass<?> weavableClass : scanner.scan(scanRequest).getClasses().with(Privilized.class)) { 052 final Policy privilizedPolicy = Policy.valueOf(weavableClass.getAnnotation(Privilized.class).value()); 053 if (privilizedPolicy == privilizer.policy) { 054 continue; 055 } 056 final String className = weavableClass.getTarget().getName(); 057 environment.debug("Class %s privilized with %s; deleting.", className, privilizedPolicy); 058 059 InputStream bytecode = null; 060 try { 061 bytecode = privilizer.env.getClassfile(className).getInputStream(); 062 final ClassReader classReader = new ClassReader(bytecode); 063 classReader.accept(new ClassVisitor(Opcodes.ASM4) { 064 @Override 065 public void visit(final int version, final int access, final String name, final String signature, 066 final String superName, final String[] interfaces) { 067 toDelete.add(name); 068 } 069 070 @Override 071 public void visitInnerClass(final String name, final String outerName, final String innerName, 072 final int access) { 073 if (toDelete.contains(outerName)) { 074 toDelete.add(name); 075 } 076 } 077 }, ClassReader.SKIP_CODE + ClassReader.SKIP_DEBUG + ClassReader.SKIP_FRAMES); 078 } catch (final Exception e) { 079 throw new RuntimeException(e); 080 } finally { 081 IOUtils.closeQuietly(bytecode); 082 } 083 } 084 boolean result = false; 085 for (final String className : toDelete) { 086 final String resourcePath = toResourcePath(className); 087 final boolean success = environment.deleteResource(resourcePath); 088 environment.debug("Deletion of resource %s was %ssuccessful.", resourcePath, success ? "" : "un"); 089 result |= success; 090 } 091 return result; 092 } 093 094 private static String toResourcePath(final String className) { 095 return className.replace('.', '/') + ".class"; 096 } 097 098}