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/*
* Copyright 2019 The Error Prone Authors.
*
* 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.google.errorprone.bugpatterns.inject.dagger;
import static com.google.errorprone.util.ASTHelpers.getGeneratedBy;
import static com.google.errorprone.util.ASTHelpers.getSymbol;
import com.google.common.collect.ImmutableSet;
import com.google.errorprone.BugPattern;
import com.google.errorprone.BugPattern.SeverityLevel;
import com.google.errorprone.VisitorState;
import com.google.errorprone.bugpatterns.BugChecker;
import com.google.errorprone.bugpatterns.BugChecker.MethodInvocationTreeMatcher;
import com.google.errorprone.matchers.Description;
import com.google.errorprone.util.ASTHelpers;
import com.sun.source.tree.ClassTree;
import com.sun.source.tree.MethodInvocationTree;
import com.sun.tools.javac.code.Symbol.ClassSymbol;
import com.sun.tools.javac.code.Symbol.MethodSymbol;
import com.sun.tools.javac.code.Type;
/**
* Checks that the only code that refers to Dagger generated code is other Dagger generated code.
*/
@BugPattern(
name = "RefersToDaggerCodegen",
summary = "Don't refer to Dagger's internal or generated code",
severity = SeverityLevel.ERROR)
public final class RefersToDaggerCodegen extends BugChecker implements MethodInvocationTreeMatcher {
private static final ImmutableSet DAGGER_INTERNAL_PACKAGES =
ImmutableSet.of(
"dagger.internal",
"dagger.producers.internal",
"dagger.producers.monitoring.internal",
"dagger.android.internal");
private static final ImmutableSet GENERATED_BASE_TYPES =
ImmutableSet.of("dagger.internal.Factory", "dagger.producers.internal.AbstractProducer");
/**
* Dagger 1 does not add an @Generated annotation, but it's code should still be able to refer to
* {@code dagger.internal} APIs.
*/
private static final ImmutableSet DAGGER_1_GENERATED_BASE_TYPES =
ImmutableSet.of("dagger.internal.Binding", "dagger.internal.ModuleAdapter");
@Override
public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
MethodSymbol method = getSymbol(tree);
ClassSymbol rootClassOfMethod = ASTHelpers.outermostClass(method);
if (!isGeneratedFactoryType(rootClassOfMethod, state)
&& !isMembersInjectionInvocation(method, state)
&& !isDaggerInternalClass(rootClassOfMethod)) {
return Description.NO_MATCH;
}
if (isAllowedToReferenceDaggerInternals(state)) {
return Description.NO_MATCH;
}
return describeMatch(tree);
}
private static boolean isMembersInjectionInvocation(MethodSymbol method, VisitorState state) {
if (method.getSimpleName().contentEquals("injectMembers")) {
return false;
}
return isGeneratedBaseType(ASTHelpers.outermostClass(method), state, "dagger.MembersInjector");
}
// TODO(ronshapiro): if we ever start emitting an annotation that has class retention, use that
// instead of checking for subtypes of generated code
private static boolean isGeneratedFactoryType(ClassSymbol symbol, VisitorState state) {
// TODO(ronshapiro): check annotation creators, inaccessible map key proxies, or inaccessible
// module constructor proxies?
return GENERATED_BASE_TYPES.stream()
.anyMatch(baseType -> isGeneratedBaseType(symbol, state, baseType));
}
private static boolean isGeneratedBaseType(
ClassSymbol symbol, VisitorState state, String baseTypeName) {
Type baseType = state.getTypeFromString(baseTypeName);
return ASTHelpers.isSubtype(symbol.asType(), baseType, state);
}
private static boolean isDaggerInternalClass(ClassSymbol symbol) {
return DAGGER_INTERNAL_PACKAGES.contains(symbol.packge().getQualifiedName().toString());
}
private static boolean isAllowedToReferenceDaggerInternals(VisitorState state) {
ClassSymbol rootCallingClass =
ASTHelpers.outermostClass(getSymbol(state.findEnclosing(ClassTree.class)));
if (rootCallingClass.getQualifiedName().toString().startsWith("dagger.")) {
return true;
}
ImmutableSet generatedBy = getGeneratedBy(rootCallingClass, state);
if (!generatedBy.isEmpty()) {
return generatedBy.contains("dagger.internal.codegen.ComponentProcessor");
}
if (DAGGER_1_GENERATED_BASE_TYPES.stream()
.anyMatch(dagger1Type -> isGeneratedBaseType(rootCallingClass, state, dagger1Type))) {
return true;
} else if (isGeneratedBaseType(rootCallingClass, state, "dagger.MembersInjector")
&& rootCallingClass.getSimpleName().toString().contains("$$ParentAdapter")) {
return true;
}
return false;
}
}