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/*
* Copyright (C) 2015 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.
*/
#include "ProguardRules.h"
#include "Util.h"
#include "XmlDom.h"
#include <memory>
#include <string>
namespace aapt {
namespace proguard {
constexpr const char16_t* kSchemaAndroid = u"http://schemas.android.com/apk/res/android";
class BaseVisitor : public xml::Visitor {
public:
BaseVisitor(const Source& source, KeepSet* keepSet) : mSource(source), mKeepSet(keepSet) {
}
virtual void visit(xml::Text*) override {};
virtual void visit(xml::Namespace* node) override {
for (const auto& child : node->children) {
child->accept(this);
}
}
virtual void visit(xml::Element* node) override {
if (!node->namespaceUri.empty()) {
Maybe<std::u16string> maybePackage = util::extractPackageFromNamespace(
node->namespaceUri);
if (maybePackage) {
// This is a custom view, let's figure out the class name from this.
std::u16string package = maybePackage.value() + u"." + node->name;
if (util::isJavaClassName(package)) {
addClass(node->lineNumber, package);
}
}
} else if (util::isJavaClassName(node->name)) {
addClass(node->lineNumber, node->name);
}
for (const auto& child: node->children) {
child->accept(this);
}
}
protected:
void addClass(size_t lineNumber, const std::u16string& className) {
mKeepSet->addClass(mSource.line(lineNumber), className);
}
void addMethod(size_t lineNumber, const std::u16string& methodName) {
mKeepSet->addMethod(mSource.line(lineNumber), methodName);
}
private:
Source mSource;
KeepSet* mKeepSet;
};
struct LayoutVisitor : public BaseVisitor {
LayoutVisitor(const Source& source, KeepSet* keepSet) : BaseVisitor(source, keepSet) {
}
virtual void visit(xml::Element* node) override {
bool checkClass = false;
bool checkName = false;
if (node->namespaceUri.empty()) {
checkClass = node->name == u"view" || node->name == u"fragment";
} else if (node->namespaceUri == kSchemaAndroid) {
checkName = node->name == u"fragment";
}
for (const auto& attr : node->attributes) {
if (checkClass && attr.namespaceUri.empty() && attr.name == u"class" &&
util::isJavaClassName(attr.value)) {
addClass(node->lineNumber, attr.value);
} else if (checkName && attr.namespaceUri == kSchemaAndroid && attr.name == u"name" &&
util::isJavaClassName(attr.value)) {
addClass(node->lineNumber, attr.value);
} else if (attr.namespaceUri == kSchemaAndroid && attr.name == u"onClick") {
addMethod(node->lineNumber, attr.value);
}
}
BaseVisitor::visit(node);
}
};
struct XmlResourceVisitor : public BaseVisitor {
XmlResourceVisitor(const Source& source, KeepSet* keepSet) : BaseVisitor(source, keepSet) {
}
virtual void visit(xml::Element* node) override {
bool checkFragment = false;
if (node->namespaceUri.empty()) {
checkFragment = node->name == u"PreferenceScreen" || node->name == u"header";
}
if (checkFragment) {
xml::Attribute* attr = node->findAttribute(kSchemaAndroid, u"fragment");
if (attr && util::isJavaClassName(attr->value)) {
addClass(node->lineNumber, attr->value);
}
}
BaseVisitor::visit(node);
}
};
struct TransitionVisitor : public BaseVisitor {
TransitionVisitor(const Source& source, KeepSet* keepSet) : BaseVisitor(source, keepSet) {
}
virtual void visit(xml::Element* node) override {
bool checkClass = node->namespaceUri.empty() &&
(node->name == u"transition" || node->name == u"pathMotion");
if (checkClass) {
xml::Attribute* attr = node->findAttribute({}, u"class");
if (attr && util::isJavaClassName(attr->value)) {
addClass(node->lineNumber, attr->value);
}
}
BaseVisitor::visit(node);
}
};
struct ManifestVisitor : public BaseVisitor {
ManifestVisitor(const Source& source, KeepSet* keepSet) : BaseVisitor(source, keepSet) {
}
virtual void visit(xml::Element* node) override {
if (node->namespaceUri.empty()) {
bool getName = false;
if (node->name == u"manifest") {
xml::Attribute* attr = node->findAttribute({}, u"package");
if (attr) {
mPackage = attr->value;
}
} else if (node->name == u"application") {
getName = true;
xml::Attribute* attr = node->findAttribute(kSchemaAndroid, u"backupAgent");
if (attr) {
Maybe<std::u16string> result = util::getFullyQualifiedClassName(mPackage,
attr->value);
if (result) {
addClass(node->lineNumber, result.value());
}
}
} else if (node->name == u"activity" || node->name == u"service" ||
node->name == u"receiver" || node->name == u"provider" ||
node->name == u"instrumentation") {
getName = true;
}
if (getName) {
xml::Attribute* attr = node->findAttribute(kSchemaAndroid, u"name");
if (attr) {
Maybe<std::u16string> result = util::getFullyQualifiedClassName(mPackage,
attr->value);
if (result) {
addClass(node->lineNumber, result.value());
}
}
}
}
BaseVisitor::visit(node);
}
std::u16string mPackage;
};
bool collectProguardRulesForManifest(const Source& source, xml::Node* node, KeepSet* keepSet) {
ManifestVisitor visitor(source, keepSet);
node->accept(&visitor);
return true;
}
bool collectProguardRules(ResourceType type, const Source& source, xml::Node* node,
KeepSet* keepSet) {
switch (type) {
case ResourceType::kLayout: {
LayoutVisitor visitor(source, keepSet);
node->accept(&visitor);
break;
}
case ResourceType::kXml: {
XmlResourceVisitor visitor(source, keepSet);
node->accept(&visitor);
break;
}
case ResourceType::kTransition: {
TransitionVisitor visitor(source, keepSet);
node->accept(&visitor);
break;
}
default:
break;
}
return true;
}
bool writeKeepSet(std::ostream* out, const KeepSet& keepSet) {
for (const auto& entry : keepSet.mKeepSet) {
for (const SourceLine& source : entry.second) {
*out << "// Referenced at " << source << "\n";
}
*out << "-keep class " << entry.first << " { <init>(...); }\n" << std::endl;
}
for (const auto& entry : keepSet.mKeepMethodSet) {
for (const SourceLine& source : entry.second) {
*out << "// Referenced at " << source << "\n";
}
*out << "-keepclassmembers class * { *** " << entry.first << "(...); }\n" << std::endl;
}
return true;
}
} // namespace proguard
} // namespace aapt
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