java/aar.go

// Copyright 2018 Google Inc. All rights reserved.
//
// 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 java

import (
	"fmt"
	"path/filepath"
	"strconv"
	"strings"

	"android/soong/android"
	"android/soong/dexpreopt"

	"github.com/google/blueprint"
	"github.com/google/blueprint/proptools"
)

type AndroidLibraryDependency interface {
	ExportPackage() android.Path
	ExportedProguardFlagFiles() android.Paths
	ExportedRRODirs() []rroDir
	ExportedStaticPackages() android.Paths
	ExportedManifests() android.Paths
	ExportedAssets() android.OptionalPath
	SetRROEnforcedForDependent(enforce bool)
	IsRROEnforced(ctx android.BaseModuleContext) bool
}

func init() {
	RegisterAARBuildComponents(android.InitRegistrationContext)
}

func RegisterAARBuildComponents(ctx android.RegistrationContext) {
	ctx.RegisterModuleType("android_library_import", AARImportFactory)
	ctx.RegisterModuleType("android_library", AndroidLibraryFactory)
	ctx.PostDepsMutators(func(ctx android.RegisterMutatorsContext) {
		ctx.TopDown("propagate_rro_enforcement", propagateRROEnforcementMutator).Parallel()
	})
}

//
// AAR (android library)
//

type androidLibraryProperties struct {
	BuildAAR bool `blueprint:"mutated"`
}

type aaptProperties struct {
	// flags passed to aapt when creating the apk
	Aaptflags []string

	// include all resource configurations, not just the product-configured
	// ones.
	Aapt_include_all_resources *bool

	// list of directories relative to the Blueprints file containing assets.
	// Defaults to ["assets"] if a directory called assets exists.  Set to []
	// to disable the default.
	Asset_dirs []string

	// list of directories relative to the Blueprints file containing
	// Android resources.  Defaults to ["res"] if a directory called res exists.
	// Set to [] to disable the default.
	Resource_dirs []string

	// list of zip files containing Android resources.
	Resource_zips []string `android:"path"`

	// path to AndroidManifest.xml.  If unset, defaults to "AndroidManifest.xml".
	Manifest *string `android:"path"`

	// paths to additional manifest files to merge with main manifest.
	Additional_manifests []string `android:"path"`

	// do not include AndroidManifest from dependent libraries
	Dont_merge_manifests *bool

	// true if RRO is enforced for any of the dependent modules
	RROEnforcedForDependent bool `blueprint:"mutated"`
}

type aapt struct {
	aaptSrcJar              android.Path
	exportPackage           android.Path
	manifestPath            android.Path
	transitiveManifestPaths android.Paths
	proguardOptionsFile     android.Path
	rroDirs                 []rroDir
	rTxt                    android.Path
	extraAaptPackagesFile   android.Path
	mergedManifestFile      android.Path
	noticeFile              android.OptionalPath
	assetPackage            android.OptionalPath
	isLibrary               bool
	useEmbeddedNativeLibs   bool
	useEmbeddedDex          bool
	usesNonSdkApis          bool
	hasNoCode               bool
	LoggingParent           string
	resourceFiles           android.Paths

	splitNames []string
	splits     []split

	aaptProperties aaptProperties
}

type split struct {
	name   string
	suffix string
	path   android.Path
}

// Propagate RRO enforcement flag to static lib dependencies transitively.
func propagateRROEnforcementMutator(ctx android.TopDownMutatorContext) {
	m := ctx.Module()
	if d, ok := m.(AndroidLibraryDependency); ok && d.IsRROEnforced(ctx) {
		ctx.VisitDirectDepsWithTag(staticLibTag, func(d android.Module) {
			if a, ok := d.(AndroidLibraryDependency); ok {
				a.SetRROEnforcedForDependent(true)
			}
		})
	}
}

func (a *aapt) ExportPackage() android.Path {
	return a.exportPackage
}

func (a *aapt) ExportedRRODirs() []rroDir {
	return a.rroDirs
}

func (a *aapt) ExportedManifests() android.Paths {
	return a.transitiveManifestPaths
}

func (a *aapt) ExportedAssets() android.OptionalPath {
	return a.assetPackage
}

func (a *aapt) SetRROEnforcedForDependent(enforce bool) {
	a.aaptProperties.RROEnforcedForDependent = enforce
}

func (a *aapt) IsRROEnforced(ctx android.BaseModuleContext) bool {
	// True if RRO is enforced for this module or...
	return ctx.Config().EnforceRROForModule(ctx.ModuleName()) ||
		// if RRO is enforced for any of its dependents.
		a.aaptProperties.RROEnforcedForDependent
}

func (a *aapt) aapt2Flags(ctx android.ModuleContext, sdkContext android.SdkContext,
	manifestPath android.Path) (compileFlags, linkFlags []string, linkDeps android.Paths,
	resDirs, overlayDirs []globbedResourceDir, rroDirs []rroDir, resZips android.Paths) {

	hasVersionCode := android.PrefixInList(a.aaptProperties.Aaptflags, "--version-code")
	hasVersionName := android.PrefixInList(a.aaptProperties.Aaptflags, "--version-name")

	// Flags specified in Android.bp
	linkFlags = append(linkFlags, a.aaptProperties.Aaptflags...)

	linkFlags = append(linkFlags, "--no-static-lib-packages")

	// Find implicit or explicit asset and resource dirs
	assetDirs := android.PathsWithOptionalDefaultForModuleSrc(ctx, a.aaptProperties.Asset_dirs, "assets")
	resourceDirs := android.PathsWithOptionalDefaultForModuleSrc(ctx, a.aaptProperties.Resource_dirs, "res")
	resourceZips := android.PathsForModuleSrc(ctx, a.aaptProperties.Resource_zips)

	// Glob directories into lists of paths
	for _, dir := range resourceDirs {
		resDirs = append(resDirs, globbedResourceDir{
			dir:   dir,
			files: androidResourceGlob(ctx, dir),
		})
		resOverlayDirs, resRRODirs := overlayResourceGlob(ctx, a, dir)
		overlayDirs = append(overlayDirs, resOverlayDirs...)
		rroDirs = append(rroDirs, resRRODirs...)
	}

	var assetDeps android.Paths
	for i, dir := range assetDirs {
		// Add a dependency on every file in the asset directory.  This ensures the aapt2
		// rule will be rerun if one of the files in the asset directory is modified.
		assetDeps = append(assetDeps, androidResourceGlob(ctx, dir)...)

		// Add a dependency on a file that contains a list of all the files in the asset directory.
		// This ensures the aapt2 rule will be run if a file is removed from the asset directory,
		// or a file is added whose timestamp is older than the output of aapt2.
		assetFileListFile := android.PathForModuleOut(ctx, "asset_dir_globs", strconv.Itoa(i)+".glob")
		androidResourceGlobList(ctx, dir, assetFileListFile)
		assetDeps = append(assetDeps, assetFileListFile)
	}

	assetDirStrings := assetDirs.Strings()
	if a.noticeFile.Valid() {
		assetDirStrings = append(assetDirStrings, filepath.Dir(a.noticeFile.Path().String()))
		assetDeps = append(assetDeps, a.noticeFile.Path())
	}

	linkFlags = append(linkFlags, "--manifest "+manifestPath.String())
	linkDeps = append(linkDeps, manifestPath)

	linkFlags = append(linkFlags, android.JoinWithPrefix(assetDirStrings, "-A "))
	linkDeps = append(linkDeps, assetDeps...)

	// SDK version flags
	minSdkVersion, err := sdkContext.MinSdkVersion(ctx).EffectiveVersionString(ctx)
	if err != nil {
		ctx.ModuleErrorf("invalid minSdkVersion: %s", err)
	}

	linkFlags = append(linkFlags, "--min-sdk-version "+minSdkVersion)
	linkFlags = append(linkFlags, "--target-sdk-version "+minSdkVersion)

	// Version code
	if !hasVersionCode {
		linkFlags = append(linkFlags, "--version-code", ctx.Config().PlatformSdkVersion().String())
	}

	if !hasVersionName {
		var versionName string
		if ctx.ModuleName() == "framework-res" {
			// Some builds set AppsDefaultVersionName() to include the build number ("O-123456").  aapt2 copies the
			// version name of framework-res into app manifests as compileSdkVersionCodename, which confuses things
			// if it contains the build number.  Use the PlatformVersionName instead.
			versionName = ctx.Config().PlatformVersionName()
		} else {
			versionName = ctx.Config().AppsDefaultVersionName()
		}
		versionName = proptools.NinjaEscape(versionName)
		linkFlags = append(linkFlags, "--version-name ", versionName)
	}

	linkFlags, compileFlags = android.FilterList(linkFlags, []string{"--legacy"})

	// Always set --pseudo-localize, it will be stripped out later for release
	// builds that don't want it.
	compileFlags = append(compileFlags, "--pseudo-localize")

	return compileFlags, linkFlags, linkDeps, resDirs, overlayDirs, rroDirs, resourceZips
}

func (a *aapt) deps(ctx android.BottomUpMutatorContext, sdkDep sdkDep) {
	if sdkDep.frameworkResModule != "" {
		ctx.AddVariationDependencies(nil, frameworkResTag, sdkDep.frameworkResModule)
	}
}

var extractAssetsRule = pctx.AndroidStaticRule("extractAssets",
	blueprint.RuleParams{
		Command:     `${config.Zip2ZipCmd} -i ${in} -o ${out} "assets/**/*"`,
		CommandDeps: []string{"${config.Zip2ZipCmd}"},
	})

func (a *aapt) buildActions(ctx android.ModuleContext, sdkContext android.SdkContext,
	classLoaderContexts dexpreopt.ClassLoaderContextMap, excludedLibs []string,
	extraLinkFlags ...string) {

	transitiveStaticLibs, transitiveStaticLibManifests, staticRRODirs, assetPackages, libDeps, libFlags :=
		aaptLibs(ctx, sdkContext, classLoaderContexts)

	// Exclude any libraries from the supplied list.
	classLoaderContexts = classLoaderContexts.ExcludeLibs(excludedLibs)

	// App manifest file
	manifestFile := proptools.StringDefault(a.aaptProperties.Manifest, "AndroidManifest.xml")
	manifestSrcPath := android.PathForModuleSrc(ctx, manifestFile)

	manifestPath := ManifestFixer(ManifestFixerParams{
		Ctx:                   ctx,
		Manifest:              manifestSrcPath,
		SdkContext:            sdkContext,
		ClassLoaderContexts:   classLoaderContexts,
		IsLibrary:             a.isLibrary,
		UseEmbeddedNativeLibs: a.useEmbeddedNativeLibs,
		UsesNonSdkApis:        a.usesNonSdkApis,
		UseEmbeddedDex:        a.useEmbeddedDex,
		HasNoCode:             a.hasNoCode,
		TestOnly:              false,
		LoggingParent:         a.LoggingParent,
	})

	// Add additional manifest files to transitive manifests.
	additionalManifests := android.PathsForModuleSrc(ctx, a.aaptProperties.Additional_manifests)
	a.transitiveManifestPaths = append(android.Paths{manifestPath}, additionalManifests...)
	a.transitiveManifestPaths = append(a.transitiveManifestPaths, transitiveStaticLibManifests...)

	if len(a.transitiveManifestPaths) > 1 && !Bool(a.aaptProperties.Dont_merge_manifests) {
		a.mergedManifestFile = manifestMerger(ctx, a.transitiveManifestPaths[0], a.transitiveManifestPaths[1:], a.isLibrary)
		if !a.isLibrary {
			// Only use the merged manifest for applications.  For libraries, the transitive closure of manifests
			// will be propagated to the final application and merged there.  The merged manifest for libraries is
			// only passed to Make, which can't handle transitive dependencies.
			manifestPath = a.mergedManifestFile
		}
	} else {
		a.mergedManifestFile = manifestPath
	}

	compileFlags, linkFlags, linkDeps, resDirs, overlayDirs, rroDirs, resZips := a.aapt2Flags(ctx, sdkContext, manifestPath)

	rroDirs = append(rroDirs, staticRRODirs...)
	linkFlags = append(linkFlags, libFlags...)
	linkDeps = append(linkDeps, libDeps...)
	linkFlags = append(linkFlags, extraLinkFlags...)
	if a.isLibrary {
		linkFlags = append(linkFlags, "--static-lib")
	}

	packageRes := android.PathForModuleOut(ctx, "package-res.apk")
	// the subdir "android" is required to be filtered by package names
	srcJar := android.PathForModuleGen(ctx, "android", "R.srcjar")
	proguardOptionsFile := android.PathForModuleGen(ctx, "proguard.options")
	rTxt := android.PathForModuleOut(ctx, "R.txt")
	// This file isn't used by Soong, but is generated for exporting
	extraPackages := android.PathForModuleOut(ctx, "extra_packages")

	var compiledResDirs []android.Paths
	for _, dir := range resDirs {
		a.resourceFiles = append(a.resourceFiles, dir.files...)
		compiledResDirs = append(compiledResDirs, aapt2Compile(ctx, dir.dir, dir.files, compileFlags).Paths())
	}

	for i, zip := range resZips {
		flata := android.PathForModuleOut(ctx, fmt.Sprintf("reszip.%d.flata", i))
		aapt2CompileZip(ctx, flata, zip, "", compileFlags)
		compiledResDirs = append(compiledResDirs, android.Paths{flata})
	}

	var compiledRes, compiledOverlay android.Paths

	compiledOverlay = append(compiledOverlay, transitiveStaticLibs...)

	if len(transitiveStaticLibs) > 0 {
		// If we are using static android libraries, every source file becomes an overlay.
		// This is to emulate old AAPT behavior which simulated library support.
		for _, compiledResDir := range compiledResDirs {
			compiledOverlay = append(compiledOverlay, compiledResDir...)
		}
	} else if a.isLibrary {
		// Otherwise, for a static library we treat all the resources equally with no overlay.
		for _, compiledResDir := range compiledResDirs {
			compiledRes = append(compiledRes, compiledResDir...)
		}
	} else if len(compiledResDirs) > 0 {
		// Without static libraries, the first directory is our directory, which can then be
		// overlaid by the rest.
		compiledRes = append(compiledRes, compiledResDirs[0]...)
		for _, compiledResDir := range compiledResDirs[1:] {
			compiledOverlay = append(compiledOverlay, compiledResDir...)
		}
	}

	for _, dir := range overlayDirs {
		compiledOverlay = append(compiledOverlay, aapt2Compile(ctx, dir.dir, dir.files, compileFlags).Paths()...)
	}

	var splitPackages android.WritablePaths
	var splits []split

	for _, s := range a.splitNames {
		suffix := strings.Replace(s, ",", "_", -1)
		path := android.PathForModuleOut(ctx, "package_"+suffix+".apk")
		linkFlags = append(linkFlags, "--split", path.String()+":"+s)
		splitPackages = append(splitPackages, path)
		splits = append(splits, split{
			name:   s,
			suffix: suffix,
			path:   path,
		})
	}

	aapt2Link(ctx, packageRes, srcJar, proguardOptionsFile, rTxt, extraPackages,
		linkFlags, linkDeps, compiledRes, compiledOverlay, assetPackages, splitPackages)

	// Extract assets from the resource package output so that they can be used later in aapt2link
	// for modules that depend on this one.
	if android.PrefixInList(linkFlags, "-A ") || len(assetPackages) > 0 {
		assets := android.PathForModuleOut(ctx, "assets.zip")
		ctx.Build(pctx, android.BuildParams{
			Rule:        extractAssetsRule,
			Input:       packageRes,
			Output:      assets,
			Description: "extract assets from built resource file",
		})
		a.assetPackage = android.OptionalPathForPath(assets)
	}

	a.aaptSrcJar = srcJar
	a.exportPackage = packageRes
	a.manifestPath = manifestPath
	a.proguardOptionsFile = proguardOptionsFile
	a.rroDirs = rroDirs
	a.extraAaptPackagesFile = extraPackages
	a.rTxt = rTxt
	a.splits = splits
}

// aaptLibs collects libraries from dependencies and sdk_version and converts them into paths
func aaptLibs(ctx android.ModuleContext, sdkContext android.SdkContext, classLoaderContexts dexpreopt.ClassLoaderContextMap) (
	transitiveStaticLibs, transitiveStaticLibManifests android.Paths, staticRRODirs []rroDir, assets, deps android.Paths, flags []string) {

	var sharedLibs android.Paths

	if classLoaderContexts == nil {
		// Not all callers need to compute class loader context, those who don't just pass nil.
		// Create a temporary class loader context here (it will be computed, but not used).
		classLoaderContexts = make(dexpreopt.ClassLoaderContextMap)
	}

	sdkDep := decodeSdkDep(ctx, sdkContext)
	if sdkDep.useFiles {
		sharedLibs = append(sharedLibs, sdkDep.jars...)
	}

	ctx.VisitDirectDeps(func(module android.Module) {
		depTag := ctx.OtherModuleDependencyTag(module)

		var exportPackage android.Path
		aarDep, _ := module.(AndroidLibraryDependency)
		if aarDep != nil {
			exportPackage = aarDep.ExportPackage()
		}

		switch depTag {
		case instrumentationForTag:
			// Nothing, instrumentationForTag is treated as libTag for javac but not for aapt2.
		case libTag:
			if exportPackage != nil {
				sharedLibs = append(sharedLibs, exportPackage)
			}
		case frameworkResTag:
			if exportPackage != nil {
				sharedLibs = append(sharedLibs, exportPackage)
			}
		case staticLibTag:
			if exportPackage != nil {
				transitiveStaticLibs = append(transitiveStaticLibs, aarDep.ExportedStaticPackages()...)
				transitiveStaticLibs = append(transitiveStaticLibs, exportPackage)
				transitiveStaticLibManifests = append(transitiveStaticLibManifests, aarDep.ExportedManifests()...)
				if aarDep.ExportedAssets().Valid() {
					assets = append(assets, aarDep.ExportedAssets().Path())
				}

			outer:
				for _, d := range aarDep.ExportedRRODirs() {
					for _, e := range staticRRODirs {
						if d.path == e.path {
							continue outer
						}
					}
					staticRRODirs = append(staticRRODirs, d)
				}
			}
		}

		addCLCFromDep(ctx, module, classLoaderContexts)
	})

	deps = append(deps, sharedLibs...)
	deps = append(deps, transitiveStaticLibs...)

	if len(transitiveStaticLibs) > 0 {
		flags = append(flags, "--auto-add-overlay")
	}

	for _, sharedLib := range sharedLibs {
		flags = append(flags, "-I "+sharedLib.String())
	}

	transitiveStaticLibs = android.FirstUniquePaths(transitiveStaticLibs)
	transitiveStaticLibManifests = android.FirstUniquePaths(transitiveStaticLibManifests)

	return transitiveStaticLibs, transitiveStaticLibManifests, staticRRODirs, assets, deps, flags
}

type AndroidLibrary struct {
	Library
	aapt

	androidLibraryProperties androidLibraryProperties

	aarFile android.WritablePath

	exportedProguardFlagFiles android.Paths
	exportedStaticPackages    android.Paths
}

var _ android.OutputFileProducer = (*AndroidLibrary)(nil)

// For OutputFileProducer interface
func (a *AndroidLibrary) OutputFiles(tag string) (android.Paths, error) {
	switch tag {
	case ".aar":
		return []android.Path{a.aarFile}, nil
	default:
		return a.Library.OutputFiles(tag)
	}
}

func (a *AndroidLibrary) ExportedProguardFlagFiles() android.Paths {
	return a.exportedProguardFlagFiles
}

func (a *AndroidLibrary) ExportedStaticPackages() android.Paths {
	return a.exportedStaticPackages
}

var _ AndroidLibraryDependency = (*AndroidLibrary)(nil)

func (a *AndroidLibrary) DepsMutator(ctx android.BottomUpMutatorContext) {
	a.Module.deps(ctx)
	sdkDep := decodeSdkDep(ctx, android.SdkContext(a))
	if sdkDep.hasFrameworkLibs() {
		a.aapt.deps(ctx, sdkDep)
	}
	a.usesLibrary.deps(ctx, sdkDep.hasFrameworkLibs())
}

func (a *AndroidLibrary) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	a.aapt.isLibrary = true
	a.classLoaderContexts = a.usesLibrary.classLoaderContextForUsesLibDeps(ctx)
	a.aapt.buildActions(ctx, android.SdkContext(a), a.classLoaderContexts, nil)

	a.hideApexVariantFromMake = !ctx.Provider(android.ApexInfoProvider).(android.ApexInfo).IsForPlatform()

	ctx.CheckbuildFile(a.proguardOptionsFile)
	ctx.CheckbuildFile(a.exportPackage)
	ctx.CheckbuildFile(a.aaptSrcJar)

	// apps manifests are handled by aapt, don't let Module see them
	a.properties.Manifest = nil

	a.linter.mergedManifest = a.aapt.mergedManifestFile
	a.linter.manifest = a.aapt.manifestPath
	a.linter.resources = a.aapt.resourceFiles

	a.Module.extraProguardFlagFiles = append(a.Module.extraProguardFlagFiles,
		a.proguardOptionsFile)

	a.Module.compile(ctx, a.aaptSrcJar)

	a.aarFile = android.PathForModuleOut(ctx, ctx.ModuleName()+".aar")
	var res android.Paths
	if a.androidLibraryProperties.BuildAAR {
		BuildAAR(ctx, a.aarFile, a.outputFile, a.manifestPath, a.rTxt, res)
		ctx.CheckbuildFile(a.aarFile)
	}

	a.exportedProguardFlagFiles = append(a.exportedProguardFlagFiles,
		android.PathsForModuleSrc(ctx, a.dexProperties.Optimize.Proguard_flags_files)...)
	ctx.VisitDirectDeps(func(m android.Module) {
		if lib, ok := m.(AndroidLibraryDependency); ok && ctx.OtherModuleDependencyTag(m) == staticLibTag {
			a.exportedProguardFlagFiles = append(a.exportedProguardFlagFiles, lib.ExportedProguardFlagFiles()...)
			a.exportedStaticPackages = append(a.exportedStaticPackages, lib.ExportPackage())
			a.exportedStaticPackages = append(a.exportedStaticPackages, lib.ExportedStaticPackages()...)
		}
	})

	a.exportedProguardFlagFiles = android.FirstUniquePaths(a.exportedProguardFlagFiles)
	a.exportedStaticPackages = android.FirstUniquePaths(a.exportedStaticPackages)
}

// android_library builds and links sources into a `.jar` file for the device along with Android resources.
//
// An android_library has a single variant that produces a `.jar` file containing `.class` files that were
// compiled against the device bootclasspath, along with a `package-res.apk` file containing  Android resources compiled
// with aapt2.  This module is not suitable for installing on a device, but can be used as a `static_libs` dependency of
// an android_app module.
func AndroidLibraryFactory() android.Module {
	module := &AndroidLibrary{}

	module.Module.addHostAndDeviceProperties()
	module.AddProperties(
		&module.aaptProperties,
		&module.androidLibraryProperties)

	module.androidLibraryProperties.BuildAAR = true
	module.Module.linter.library = true

	android.InitApexModule(module)
	InitJavaModule(module, android.DeviceSupported)
	return module
}

//
// AAR (android library) prebuilts
//

type AARImportProperties struct {
	Aars []string `android:"path"`

	Sdk_version     *string
	Min_sdk_version *string

	Static_libs []string
	Libs        []string

	// if set to true, run Jetifier against .aar file. Defaults to false.
	Jetifier *bool
}

type AARImport struct {
	android.ModuleBase
	android.DefaultableModuleBase
	android.ApexModuleBase
	prebuilt android.Prebuilt

	// Functionality common to Module and Import.
	embeddableInModuleAndImport

	properties AARImportProperties

	classpathFile         android.WritablePath
	proguardFlags         android.WritablePath
	exportPackage         android.WritablePath
	extraAaptPackagesFile android.WritablePath
	manifest              android.WritablePath
	assetsPackage         android.WritablePath

	exportedStaticPackages android.Paths

	hideApexVariantFromMake bool

	aarPath android.Path

	sdkVersion    android.SdkSpec
	minSdkVersion android.SdkSpec
}

var _ android.OutputFileProducer = (*AARImport)(nil)

// For OutputFileProducer interface
func (a *AARImport) OutputFiles(tag string) (android.Paths, error) {
	switch tag {
	case ".aar":
		return []android.Path{a.aarPath}, nil
	case "":
		return []android.Path{a.classpathFile}, nil
	default:
		return nil, fmt.Errorf("unsupported module reference tag %q", tag)
	}
}

func (a *AARImport) SdkVersion(ctx android.EarlyModuleContext) android.SdkSpec {
	return android.SdkSpecFrom(ctx, String(a.properties.Sdk_version))
}

func (a *AARImport) SystemModules() string {
	return ""
}

func (a *AARImport) MinSdkVersion(ctx android.EarlyModuleContext) android.SdkSpec {
	if a.properties.Min_sdk_version != nil {
		return android.SdkSpecFrom(ctx, *a.properties.Min_sdk_version)
	}
	return a.SdkVersion(ctx)
}

func (a *AARImport) TargetSdkVersion(ctx android.EarlyModuleContext) android.SdkSpec {
	return a.SdkVersion(ctx)
}

func (a *AARImport) javaVersion() string {
	return ""
}

var _ AndroidLibraryDependency = (*AARImport)(nil)

func (a *AARImport) ExportPackage() android.Path {
	return a.exportPackage
}

func (a *AARImport) ExportedProguardFlagFiles() android.Paths {
	return android.Paths{a.proguardFlags}
}

func (a *AARImport) ExportedRRODirs() []rroDir {
	return nil
}

func (a *AARImport) ExportedStaticPackages() android.Paths {
	return a.exportedStaticPackages
}

func (a *AARImport) ExportedManifests() android.Paths {
	return android.Paths{a.manifest}
}

func (a *AARImport) ExportedAssets() android.OptionalPath {
	return android.OptionalPathForPath(a.assetsPackage)
}

// RRO enforcement is not available on aar_import since its RRO dirs are not
// exported.
func (a *AARImport) SetRROEnforcedForDependent(enforce bool) {
}

// RRO enforcement is not available on aar_import since its RRO dirs are not
// exported.
func (a *AARImport) IsRROEnforced(ctx android.BaseModuleContext) bool {
	return false
}

func (a *AARImport) Prebuilt() *android.Prebuilt {
	return &a.prebuilt
}

func (a *AARImport) Name() string {
	return a.prebuilt.Name(a.ModuleBase.Name())
}

func (a *AARImport) JacocoReportClassesFile() android.Path {
	return nil
}

func (a *AARImport) DepsMutator(ctx android.BottomUpMutatorContext) {
	if !ctx.Config().AlwaysUsePrebuiltSdks() {
		sdkDep := decodeSdkDep(ctx, android.SdkContext(a))
		if sdkDep.useModule && sdkDep.frameworkResModule != "" {
			ctx.AddVariationDependencies(nil, frameworkResTag, sdkDep.frameworkResModule)
		}
	}

	ctx.AddVariationDependencies(nil, libTag, a.properties.Libs...)
	ctx.AddVariationDependencies(nil, staticLibTag, a.properties.Static_libs...)
}

// Unzip an AAR into its constituent files and directories.  Any files in Outputs that don't exist in the AAR will be
// touched to create an empty file. The res directory is not extracted, as it will be extracted in its own rule.
var unzipAAR = pctx.AndroidStaticRule("unzipAAR",
	blueprint.RuleParams{
		Command: `rm -rf $outDir && mkdir -p $outDir && ` +
			`unzip -qoDD -d $outDir $in && rm -rf $outDir/res && touch $out && ` +
			`${config.Zip2ZipCmd} -i $in -o $assetsPackage 'assets/**/*' && ` +
			`${config.MergeZipsCmd} $combinedClassesJar $$(ls $outDir/classes.jar 2> /dev/null) $$(ls $outDir/libs/*.jar 2> /dev/null)`,
		CommandDeps: []string{"${config.MergeZipsCmd}", "${config.Zip2ZipCmd}"},
	},
	"outDir", "combinedClassesJar", "assetsPackage")

func (a *AARImport) GenerateAndroidBuildActions(ctx android.ModuleContext) {
	if len(a.properties.Aars) != 1 {
		ctx.PropertyErrorf("aars", "exactly one aar is required")
		return
	}

	a.sdkVersion = a.SdkVersion(ctx)
	a.minSdkVersion = a.MinSdkVersion(ctx)

	a.hideApexVariantFromMake = !ctx.Provider(android.ApexInfoProvider).(android.ApexInfo).IsForPlatform()

	aarName := ctx.ModuleName() + ".aar"
	a.aarPath = android.PathForModuleSrc(ctx, a.properties.Aars[0])

	if Bool(a.properties.Jetifier) {
		inputFile := a.aarPath
		a.aarPath = android.PathForModuleOut(ctx, "jetifier", aarName)
		TransformJetifier(ctx, a.aarPath.(android.WritablePath), inputFile)
	}

	extractedAARDir := android.PathForModuleOut(ctx, "aar")
	a.classpathFile = extractedAARDir.Join(ctx, "classes-combined.jar")
	a.proguardFlags = extractedAARDir.Join(ctx, "proguard.txt")
	a.manifest = extractedAARDir.Join(ctx, "AndroidManifest.xml")
	a.assetsPackage = android.PathForModuleOut(ctx, "assets.zip")

	ctx.Build(pctx, android.BuildParams{
		Rule:        unzipAAR,
		Input:       a.aarPath,
		Outputs:     android.WritablePaths{a.classpathFile, a.proguardFlags, a.manifest, a.assetsPackage},
		Description: "unzip AAR",
		Args: map[string]string{
			"outDir":             extractedAARDir.String(),
			"combinedClassesJar": a.classpathFile.String(),
			"assetsPackage":      a.assetsPackage.String(),
		},
	})

	// Always set --pseudo-localize, it will be stripped out later for release
	// builds that don't want it.
	compileFlags := []string{"--pseudo-localize"}
	compiledResDir := android.PathForModuleOut(ctx, "flat-res")
	flata := compiledResDir.Join(ctx, "gen_res.flata")
	aapt2CompileZip(ctx, flata, a.aarPath, "res", compileFlags)

	a.exportPackage = android.PathForModuleOut(ctx, "package-res.apk")
	// the subdir "android" is required to be filtered by package names
	srcJar := android.PathForModuleGen(ctx, "android", "R.srcjar")
	proguardOptionsFile := android.PathForModuleGen(ctx, "proguard.options")
	rTxt := android.PathForModuleOut(ctx, "R.txt")
	a.extraAaptPackagesFile = android.PathForModuleOut(ctx, "extra_packages")

	var linkDeps android.Paths

	linkFlags := []string{
		"--static-lib",
		"--no-static-lib-packages",
		"--auto-add-overlay",
	}

	linkFlags = append(linkFlags, "--manifest "+a.manifest.String())
	linkDeps = append(linkDeps, a.manifest)

	transitiveStaticLibs, staticLibManifests, staticRRODirs, transitiveAssets, libDeps, libFlags :=
		aaptLibs(ctx, android.SdkContext(a), nil)

	_ = staticLibManifests
	_ = staticRRODirs

	linkDeps = append(linkDeps, libDeps...)
	linkFlags = append(linkFlags, libFlags...)

	overlayRes := append(android.Paths{flata}, transitiveStaticLibs...)

	aapt2Link(ctx, a.exportPackage, srcJar, proguardOptionsFile, rTxt, a.extraAaptPackagesFile,
		linkFlags, linkDeps, nil, overlayRes, transitiveAssets, nil)

	// Merge this import's assets with its dependencies' assets (if there are any).
	if len(transitiveAssets) > 0 {
		mergedAssets := android.PathForModuleOut(ctx, "merged-assets.zip")
		inputZips := append(android.Paths{a.assetsPackage}, transitiveAssets...)
		ctx.Build(pctx, android.BuildParams{
			Rule:        mergeAssetsRule,
			Inputs:      inputZips,
			Output:      mergedAssets,
			Description: "merge assets from dependencies and self",
		})
		a.assetsPackage = mergedAssets
	}

	ctx.SetProvider(JavaInfoProvider, JavaInfo{
		HeaderJars:                     android.PathsIfNonNil(a.classpathFile),
		ImplementationAndResourcesJars: android.PathsIfNonNil(a.classpathFile),
		ImplementationJars:             android.PathsIfNonNil(a.classpathFile),
	})
}

func (a *AARImport) HeaderJars() android.Paths {
	return android.Paths{a.classpathFile}
}

func (a *AARImport) ImplementationAndResourcesJars() android.Paths {
	return android.Paths{a.classpathFile}
}

func (a *AARImport) DexJarBuildPath() android.Path {
	return nil
}

func (a *AARImport) DexJarInstallPath() android.Path {
	return nil
}

func (a *AARImport) ClassLoaderContexts() dexpreopt.ClassLoaderContextMap {
	return nil
}

var _ android.ApexModule = (*AARImport)(nil)

// Implements android.ApexModule
func (a *AARImport) DepIsInSameApex(ctx android.BaseModuleContext, dep android.Module) bool {
	return a.depIsInSameApex(ctx, dep)
}

// Implements android.ApexModule
func (g *AARImport) ShouldSupportSdkVersion(ctx android.BaseModuleContext,
	sdkVersion android.ApiLevel) error {
	return nil
}

var _ android.PrebuiltInterface = (*Import)(nil)

// android_library_import imports an `.aar` file into the build graph as if it was built with android_library.
//
// This module is not suitable for installing on a device, but can be used as a `static_libs` dependency of
// an android_app module.
func AARImportFactory() android.Module {
	module := &AARImport{}

	module.AddProperties(&module.properties)

	android.InitPrebuiltModule(module, &module.properties.Aars)
	android.InitApexModule(module)
	InitJavaModule(module, android.DeviceSupported)
	return module
}