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/*
* Copyright (C) 2020 The Android Open Source Project
*
* Licensed 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 com.android.jarjar;
import com.tonicsystems.jarjar.util.JarTransformer;
import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.ClassVisitor;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.commons.Remapper;
import java.util.Set;
import java.util.function.Supplier;
/**
* A transformer that removes annotations from repackaged classes.
*/
public final class RemoveAndroidCompatAnnotationsJarTransformer extends JarTransformer {
private static int ASM_VERSION = Opcodes.ASM9;
private static final Set<String> REMOVE_ANNOTATIONS = Set.of(
"Landroid/compat/annotation/UnsupportedAppUsage;");
private final Remapper remapper;
public RemoveAndroidCompatAnnotationsJarTransformer(Remapper remapper) {
this.remapper = remapper;
}
protected ClassVisitor transform(ClassVisitor classVisitor) {
return new AnnotationRemover(classVisitor);
}
private class AnnotationRemover extends ClassVisitor {
private boolean isClassRemapped;
AnnotationRemover(ClassVisitor cv) {
super(ASM_VERSION, cv);
}
@Override
public void visit(int version, int access, String name, String signature, String superName,
String[] interfaces) {
String newName = remapper.map(name);
// On every new class header visit, remember whether the class is repackaged.
isClassRemapped = newName != null && !newName.equals(name);
super.visit(version, access, name, signature, superName, interfaces);
}
@Override
public AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
return visitAnnotationCommon(descriptor,
() -> super.visitAnnotation(descriptor, visible));
}
@Override
public FieldVisitor visitField(int access, String name, String descriptor, String signature,
Object value) {
FieldVisitor superVisitor =
super.visitField(access, name, descriptor, signature, value);
return new FieldVisitor(ASM_VERSION, superVisitor) {
@Override
public AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
return visitAnnotationCommon(descriptor,
() -> super.visitAnnotation(descriptor, visible));
}
};
}
@Override
public MethodVisitor visitMethod(int access, String name, String descriptor,
String signature, String[] exceptions) {
MethodVisitor superVisitor =
super.visitMethod(access, name, descriptor, signature, exceptions);
return new MethodVisitor(ASM_VERSION, superVisitor) {
@Override
public AnnotationVisitor visitAnnotation(String descriptor, boolean visible) {
return visitAnnotationCommon(descriptor,
() -> super.visitAnnotation(descriptor, visible));
}
};
}
/**
* Create an {@link AnnotationVisitor} that removes any annotations from {@link
* #REMOVE_ANNOTATIONS} if the class is being repackaged.
*
* <p>For the annotations to be dropped correctly, do not visit the annotation beforehand,
* provide a supplier instead.
*/
private AnnotationVisitor visitAnnotationCommon(String annotation,
Supplier<AnnotationVisitor> defaultVisitorSupplier) {
if (isClassRemapped && REMOVE_ANNOTATIONS.contains(annotation)) {
return null;
}
// Only get() the default AnnotationVisitor if the annotation is to be included.
// Invoking super.visitAnnotation(descriptor, visible) causes the annotation to be
// included in the output even if the resulting AnnotationVisitor is not returned or
// used.
return defaultVisitorSupplier.get();
}
}
}
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