| /* |
| * Copyright 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. |
| */ |
| |
| @file:Suppress("UnstableApiUsage") |
| |
| package androidx.build.lint |
| |
| import com.android.tools.lint.client.api.UElementHandler |
| import com.android.tools.lint.detector.api.Category |
| import com.android.tools.lint.detector.api.Detector |
| import com.android.tools.lint.detector.api.Implementation |
| import com.android.tools.lint.detector.api.Incident |
| import com.android.tools.lint.detector.api.Issue |
| import com.android.tools.lint.detector.api.JavaContext |
| import com.android.tools.lint.detector.api.Scope |
| import com.android.tools.lint.detector.api.Severity |
| import org.jetbrains.uast.UAnnotated |
| import org.jetbrains.uast.UAnnotation |
| import org.jetbrains.uast.UClass |
| import org.jetbrains.uast.UElement |
| import org.jetbrains.uast.resolveToUElement |
| |
| /** |
| * Prevents usage of experimental annotations outside the groups in which they were defined. |
| */ |
| class BanInappropriateExperimentalUsage : Detector(), Detector.UastScanner { |
| |
| override fun getApplicableUastTypes() = listOf(UAnnotation::class.java) |
| |
| override fun createUastHandler(context: JavaContext): UElementHandler { |
| return AnnotationChecker(context) |
| } |
| |
| private inner class AnnotationChecker(val context: JavaContext) : UElementHandler() { |
| override fun visitAnnotation(node: UAnnotation) { |
| if (DEBUG) { |
| if (APPLICABLE_ANNOTATIONS.contains(node.qualifiedName) && node.sourcePsi != null) { |
| (node.uastParent as? UClass)?.let { annotation -> |
| println( |
| "${context.driver.mode}: declared ${annotation.qualifiedName} in " + |
| "${context.project}" |
| ) |
| } |
| } |
| } |
| |
| // If we find an usage of an experimentally-declared annotation, check it. |
| val annotation = node.resolveToUElement() |
| if (annotation is UAnnotated) { |
| val annotations = context.evaluator.getAllAnnotations(annotation, false) |
| if (annotations.any { APPLICABLE_ANNOTATIONS.contains(it.qualifiedName) }) { |
| if (DEBUG) { |
| println( |
| "${context.driver.mode}: used ${node.qualifiedName} in " + |
| "${context.project}" |
| ) |
| } |
| verifyUsageOfElementIsWithinSameGroup(context, node, annotation, ISSUE) |
| } |
| } |
| } |
| } |
| |
| fun verifyUsageOfElementIsWithinSameGroup( |
| context: JavaContext, |
| usage: UElement, |
| annotation: UElement, |
| issue: Issue, |
| ) { |
| val evaluator = context.evaluator |
| val usageCoordinates = evaluator.getLibrary(usage) ?: context.project.mavenCoordinate |
| val usageGroupId = usageCoordinates?.groupId |
| val annotationGroupId = evaluator.getLibrary(annotation)?.groupId |
| if (annotationGroupId != usageGroupId && annotationGroupId != null) { |
| if (DEBUG) { |
| println( |
| "${context.driver.mode}: report usage of $annotationGroupId in $usageGroupId" |
| ) |
| } |
| Incident(context) |
| .issue(issue) |
| .at(usage) |
| .message( |
| "`Experimental` and `RequiresOptIn` APIs may only be used within the " + |
| "same-version group where they were defined." |
| ) |
| .report() |
| } |
| } |
| |
| companion object { |
| private const val DEBUG = false |
| |
| /** |
| * Even though Kotlin's [Experimental] annotation is deprecated in favor of [RequiresOptIn], |
| * we still want to check for its use in Lint. |
| */ |
| private const val KOTLIN_EXPERIMENTAL_ANNOTATION = "kotlin.Experimental" |
| |
| private const val KOTLIN_REQUIRES_OPT_IN_ANNOTATION = "kotlin.RequiresOptIn" |
| private const val JAVA_EXPERIMENTAL_ANNOTATION = |
| "androidx.annotation.experimental.Experimental" |
| private const val JAVA_REQUIRES_OPT_IN_ANNOTATION = |
| "androidx.annotation.RequiresOptIn" |
| |
| private val APPLICABLE_ANNOTATIONS = listOf( |
| JAVA_EXPERIMENTAL_ANNOTATION, |
| KOTLIN_EXPERIMENTAL_ANNOTATION, |
| JAVA_REQUIRES_OPT_IN_ANNOTATION, |
| KOTLIN_REQUIRES_OPT_IN_ANNOTATION, |
| ) |
| |
| val ISSUE = Issue.create( |
| id = "IllegalExperimentalApiUsage", |
| briefDescription = "Using experimental API from separately versioned library", |
| explanation = "Annotations meta-annotated with `@RequiresOptIn` or `@Experimental` " + |
| "may only be referenced from within the same-version group in which they were " + |
| "defined.", |
| category = Category.CORRECTNESS, |
| priority = 5, |
| severity = Severity.ERROR, |
| implementation = Implementation( |
| BanInappropriateExperimentalUsage::class.java, |
| Scope.JAVA_FILE_SCOPE, |
| ), |
| ) |
| } |
| } |
