/
KotlinBaseProcessorUnit.kt
497 lines (446 loc) · 23.8 KB
/
KotlinBaseProcessorUnit.kt
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package permissions.dispatcher.processor.impl.kotlin
import com.squareup.kotlinpoet.*
import com.squareup.kotlinpoet.ParameterizedTypeName.Companion.plusParameter
import permissions.dispatcher.NeedsPermission
import permissions.dispatcher.processor.KtProcessorUnit
import permissions.dispatcher.processor.RequestCodeProvider
import permissions.dispatcher.processor.RuntimePermissionsElement
import permissions.dispatcher.processor.util.*
import javax.lang.model.element.ExecutableElement
/**
* Base class for [KtProcessorUnit] implementations.
* <p>
* This generates the parts of code independent from specific permission method signatures for different target objects.
*/
abstract class KotlinBaseProcessorUnit : KtProcessorUnit {
protected val PERMISSION_UTILS = ClassName("permissions.dispatcher", "PermissionUtils")
private val BUILD = ClassName("android.os", "Build")
private val INT_ARRAY = ClassName("kotlin", "IntArray")
private val WEAK_REFERENCE = ClassName("java.lang.ref", "WeakReference")
private val MANIFEST_WRITE_SETTING = "android.permission.WRITE_SETTINGS"
private val MANIFEST_SYSTEM_ALERT_WINDOW = "android.permission.SYSTEM_ALERT_WINDOW"
private val ADD_WITH_CHECK_BODY_MAP = hashMapOf(MANIFEST_SYSTEM_ALERT_WINDOW to SystemAlertWindowHelper(), MANIFEST_WRITE_SETTING to WriteSettingsHelper())
abstract fun addRequestPermissionsStatement(builder: FunSpec.Builder, targetParam: String = "this", permissionField: String, requestCodeField: String)
abstract fun addShouldShowRequestPermissionRationaleCondition(builder: FunSpec.Builder, permissionField: String, isPositiveCondition: Boolean = true)
abstract fun getActivityName(targetParam: String = "this"): String
override fun createFile(rpe: RuntimePermissionsElement, requestCodeProvider: RequestCodeProvider): FileSpec {
return FileSpec.builder(rpe.packageName, rpe.generatedClassName)
.addComment(FILE_COMMENT)
.addAnnotation(createJvmNameAnnotation(rpe.generatedClassName))
.addProperties(createProperties(rpe, requestCodeProvider))
.addFunctions(createWithPermissionCheckFuns(rpe))
.addFunctions(createOnShowRationaleCallbackFuns(rpe))
.addFunctions(createPermissionHandlingFuns(rpe))
.addTypes(createPermissionRequestClasses(rpe))
.build()
}
private fun createJvmNameAnnotation(generatedClassName: String): AnnotationSpec {
return AnnotationSpec.builder(ClassName("", "JvmName"))
.addMember("%S", generatedClassName)
.build()
}
private fun createProperties(rpe: RuntimePermissionsElement, requestCodeProvider: RequestCodeProvider): List<PropertySpec> {
val properties = arrayListOf<PropertySpec>()
// The set of annotated elements needs to be ordered in order to achieve deterministic, reproducible builds
rpe.needsElements.sortedBy { it.simpleString() }.forEach {
properties.add(createRequestCodeProp(it, requestCodeProvider.nextRequestCode()))
properties.add(createPermissionProperty(it))
if (it.parameters.isNotEmpty()) {
val hasOnRationaleParams = rpe.findOnRationaleForNeeds(it)?.parameters?.isNotEmpty()
?: true
if (hasOnRationaleParams) {
properties.add(createPendingRequestProperty(it))
} else {
properties.addAll(createArgProps(it))
}
}
}
return properties
}
private fun createRequestCodeProp(e: ExecutableElement, index: Int): PropertySpec {
return PropertySpec.builder(requestCodeFieldName(e), Int::class.java, KModifier.CONST, KModifier.PRIVATE)
.initializer("%L", index)
.build()
}
private fun createArgProps(method: ExecutableElement): List<PropertySpec> {
return method.parameters.map {
PropertySpec.builder(method.argumentFieldName(it), it.asPreparedType().copy(nullable = true), KModifier.PRIVATE)
.mutable()
.initializer(CodeBlock.of("null"))
.build()
}
}
private fun createPermissionProperty(e: ExecutableElement): PropertySpec {
val permissionValue = e.getAnnotation(NeedsPermission::class.java).permissionValue()
val formattedValue = permissionValue.joinToString(
separator = ", ",
transform = { "\"$it\"" }
)
val parameterType = ARRAY.plusParameter(ClassName("kotlin", "String"))
return PropertySpec.builder(permissionFieldName(e), parameterType, KModifier.PRIVATE)
.initializer("arrayOf(%L)", formattedValue)
.build()
}
private fun createPendingRequestProperty(e: ExecutableElement): PropertySpec {
val type = ClassName("permissions.dispatcher", "GrantableRequest").copy(nullable = true)
return PropertySpec
.builder(pendingRequestFieldName(e), type, KModifier.PRIVATE)
.mutable()
.initializer(CodeBlock.of("null"))
.build()
}
private fun createWithPermissionCheckFuns(rpe: RuntimePermissionsElement): List<FunSpec> {
return rpe.needsElements.map { createWithPermissionCheckFun(rpe, it) }
}
private fun createWithPermissionCheckFun(rpe: RuntimePermissionsElement, method: ExecutableElement): FunSpec {
val builder = FunSpec.builder(withPermissionCheckMethodName(method))
.addOriginatingElement(rpe.element)
.addTypeVariables(rpe.ktTypeVariables)
.receiver(rpe.ktTypeName)
if (method.enclosingElement.isInternal) {
builder.addModifiers(KModifier.INTERNAL)
}
method.parameters.forEach {
builder.addParameter(it.simpleString(), it.asPreparedType())
}
addWithPermissionCheckBody(builder, method, rpe)
return builder.build()
}
private fun addWithPermissionCheckBody(builder: FunSpec.Builder, needsMethod: ExecutableElement, rpe: RuntimePermissionsElement) {
// Create field names for the constants to use
val requestCodeField = requestCodeFieldName(needsMethod)
val permissionField = permissionFieldName(needsMethod)
// if maxSdkVersion is lower than os level does nothing
val maxSdkVersion = needsMethod.getAnnotation(NeedsPermission::class.java).maxSdkVersion
if (maxSdkVersion > 0) {
builder.beginControlFlow("if (%T.VERSION.SDK_INT > %L)", BUILD, maxSdkVersion)
.addCode(CodeBlock.builder()
.add("%N(", needsMethod.simpleString())
.add(varargsKtParametersCodeBlock(needsMethod))
.addStatement(")")
.addStatement("return")
.build())
.endControlFlow()
}
// Add the conditional for when permission has already been granted
val needsPermissionParameter = needsMethod.getAnnotation(NeedsPermission::class.java).value[0]
val activity = getActivityName()
ADD_WITH_CHECK_BODY_MAP[needsPermissionParameter]?.addHasSelfPermissionsCondition(builder, activity, permissionField)
?: builder.beginControlFlow("if (%T.hasSelfPermissions(%L, *%N))", PERMISSION_UTILS, activity, permissionField)
builder.addCode(CodeBlock.builder()
.add("%N(", needsMethod.simpleString())
.add(varargsKtParametersCodeBlock(needsMethod))
.addStatement(")")
.build()
)
builder.nextControlFlow("else")
// Add the conditional for "OnShowRationale", if present
val onRationale = rpe.findOnRationaleForNeeds(needsMethod)
val hasOnRationaleParams = onRationale?.parameters?.isNotEmpty() ?: true
val hasParameters = needsMethod.parameters.isNotEmpty()
if (hasParameters) {
if (hasOnRationaleParams) {
// If the method has parameters, precede the potential OnRationale call with
// an instantiation of the temporary Request object
val varargsCall = CodeBlock.builder()
.add("%N = %N(this, ",
pendingRequestFieldName(needsMethod),
permissionRequestTypeName(rpe, needsMethod)
)
.add(varargsKtParametersCodeBlock(needsMethod))
.addStatement(")")
builder.addCode(varargsCall.build())
} else {
needsMethod.parameters.forEach {
val code = CodeBlock.builder().addStatement("%N = %N", needsMethod.argumentFieldName(it), it.simpleString())
builder.addCode(code.build())
}
}
}
if (onRationale != null) {
addShouldShowRequestPermissionRationaleCondition(builder, permissionField)
if (hasParameters) {
if (hasOnRationaleParams) {
// For methods with parameters, use the PermissionRequest instantiated above
builder.addStatement("%N?.let { %N(it) }", pendingRequestFieldName(needsMethod), onRationale.simpleString())
} else {
builder.addStatement("%N()", onRationale.simpleString())
}
} else {
if (hasOnRationaleParams) {
// Otherwise, create a new PermissionRequest on-the-fly
builder.addStatement("%N(%N(this))", onRationale.simpleString(), permissionRequestTypeName(rpe, needsMethod))
} else {
builder.addStatement("%N()", onRationale.simpleString())
}
}
builder.nextControlFlow("else")
}
ADD_WITH_CHECK_BODY_MAP[needsPermissionParameter]?.addRequestPermissionsStatement(builder = builder, activityVar = getActivityName(), requestCodeField = requestCodeField)
?: addRequestPermissionsStatement(builder = builder, permissionField = permissionField, requestCodeField = requestCodeField)
if (onRationale != null) {
builder.endControlFlow()
}
builder.endControlFlow()
}
private fun createOnShowRationaleCallbackFuns(rpe: RuntimePermissionsElement): List<FunSpec> {
val methods = arrayListOf<FunSpec>()
rpe.needsElements.forEach {
if (rpe.findOnRationaleForNeeds(it) != null) {
val rationale = rpe.findOnRationaleForNeeds(it)
val isRationaleParamsEmpty = rationale?.parameters?.isEmpty() ?: false
if (isRationaleParamsEmpty) {
methods.add(createProceedPermissionRequestFun(rpe, it))
val onDenied = rpe.findOnDeniedForNeeds(it)
if (onDenied != null) {
methods.add(createCancelPermissionRequestFun(rpe, onDenied, it))
}
}
}
}
return methods
}
private fun createProceedPermissionRequestFun(rpe: RuntimePermissionsElement, needsMethod: ExecutableElement): FunSpec {
val builder = FunSpec.builder(needsMethod.proceedOnShowRationaleMethodName())
.addOriginatingElement(rpe.element)
.addTypeVariables(rpe.ktTypeVariables)
.receiver(rpe.ktTypeName)
val targetParam = "this"
val requestCodeField = requestCodeFieldName(needsMethod)
ADD_WITH_CHECK_BODY_MAP[needsMethod.getAnnotation(NeedsPermission::class.java).value[0]]?.addRequestPermissionsStatement(builder, targetParam, getActivityName(targetParam), requestCodeField)
?: addRequestPermissionsStatement(builder, targetParam, permissionFieldName(needsMethod), requestCodeField)
return builder.build()
}
private fun createCancelPermissionRequestFun(rpe: RuntimePermissionsElement, onDenied: ExecutableElement, needsMethod: ExecutableElement): FunSpec {
return FunSpec.builder(needsMethod.cancelOnShowRationaleMethodName())
.addOriginatingElement(rpe.element)
.addTypeVariables(rpe.ktTypeVariables)
.receiver(rpe.ktTypeName)
.addStatement("this.%N()", onDenied.simpleString())
.build()
}
private fun createPermissionHandlingFuns(rpe: RuntimePermissionsElement): List<FunSpec> {
val methods = arrayListOf<FunSpec>()
if (hasNormalPermission(rpe)) {
methods.add(createPermissionResultFun(rpe))
}
if (isDefinePermission(rpe, MANIFEST_SYSTEM_ALERT_WINDOW) || isDefinePermission(rpe, MANIFEST_WRITE_SETTING)) {
methods.add(createOnActivityResultFun(rpe))
}
return methods
}
private fun createOnActivityResultFun(rpe: RuntimePermissionsElement): FunSpec {
val requestCodeParam = "requestCode"
val grantResultsParam = "grantResults"
val builder = FunSpec.builder("onActivityResult")
.addOriginatingElement(rpe.element)
.addTypeVariables(rpe.ktTypeVariables)
.receiver(rpe.ktTypeName)
.addParameter(requestCodeParam, INT)
if (rpe.element.isInternal) {
builder.addModifiers(KModifier.INTERNAL)
}
builder.beginControlFlow("when (%N)", requestCodeParam)
for (needsMethod in rpe.needsElements) {
val needsPermissionParameter = needsMethod.getAnnotation(NeedsPermission::class.java).value[0]
if (!ADD_WITH_CHECK_BODY_MAP.containsKey(needsPermissionParameter)) {
continue
}
builder.beginControlFlow("%N ->", requestCodeFieldName(needsMethod))
addResultCaseBody(builder, needsMethod, rpe, grantResultsParam)
builder.endControlFlow()
}
builder.endControlFlow()
return builder.build()
}
private fun createPermissionResultFun(rpe: RuntimePermissionsElement): FunSpec {
val requestCodeParam = "requestCode"
val grantResultsParam = "grantResults"
val builder = FunSpec.builder("onRequestPermissionsResult")
.addOriginatingElement(rpe.element)
.addTypeVariables(rpe.ktTypeVariables)
.receiver(rpe.ktTypeName)
.addParameter(requestCodeParam, INT)
.addParameter(grantResultsParam, INT_ARRAY)
if (rpe.element.isInternal) {
builder.addModifiers(KModifier.INTERNAL)
}
builder.beginControlFlow("when (%N)", requestCodeParam)
for (needsMethod in rpe.needsElements) {
val needsPermissionParameter = needsMethod.getAnnotation(NeedsPermission::class.java).value[0]
if (ADD_WITH_CHECK_BODY_MAP.containsKey(needsPermissionParameter)) {
continue
}
builder.beginControlFlow("%N ->\n", requestCodeFieldName(needsMethod))
addResultCaseBody(builder, needsMethod, rpe, grantResultsParam)
builder.endControlFlow()
}
builder.endControlFlow()
return builder.build()
}
private fun addResultCaseBody(builder: FunSpec.Builder, needsMethod: ExecutableElement, rpe: RuntimePermissionsElement, grantResultsParam: String) {
val onDenied = rpe.findOnDeniedForNeeds(needsMethod)
val hasDenied = onDenied != null
val needsPermissionParameter = needsMethod.getAnnotation(NeedsPermission::class.java).value[0]
val permissionField = permissionFieldName(needsMethod)
// Add the conditional for "permission verified"
val activity = getActivityName()
ADD_WITH_CHECK_BODY_MAP[needsPermissionParameter]?.addHasSelfPermissionsCondition(builder, activity, permissionField)
?: builder.beginControlFlow("if (%T.verifyPermissions(*%N))", PERMISSION_UTILS, grantResultsParam)
val onRationale = rpe.findOnRationaleForNeeds(needsMethod)
val hasOnRationaleParams = onRationale?.parameters?.isNotEmpty() ?: true
val hasParameters = needsMethod.parameters.isNotEmpty()
if (hasParameters) {
if (hasOnRationaleParams) {
val pendingField = pendingRequestFieldName(needsMethod)
builder.addStatement("%N?.grant()", pendingField)
} else {
ADD_WITH_CHECK_BODY_MAP[needsPermissionParameter]?.addHasSelfPermissionsCondition(builder, activity, permissionField)
?: builder.beginControlFlow("if (%T.hasSelfPermissions(%L, *%N))", PERMISSION_UTILS, activity, permissionField)
builder.addCode(CodeBlock.builder()
.add("%N(", needsMethod.simpleString())
.add(varargsKtParametersCodeBlock(needsMethod, withCache = true))
.addStatement(")")
.build())
builder.endControlFlow()
}
} else {
builder.addStatement("%N()", needsMethod.simpleString())
}
// Add the conditional for "permission denied" and/or "never ask again", if present
val onNeverAsk = rpe.findOnNeverAskForNeeds(needsMethod)
val hasNeverAsk = onNeverAsk != null
if (hasDenied || hasNeverAsk) {
builder.nextControlFlow("else")
}
if (onNeverAsk != null) {
// Split up the "else" case with another if condition checking for "never ask again" first
addShouldShowRequestPermissionRationaleCondition(builder, permissionFieldName(needsMethod), false)
builder.addStatement("%N()", onNeverAsk.simpleString())
// If a "permission denied" is present as well, go into an else case, otherwise close this temporary branch
if (hasDenied) {
builder.nextControlFlow("else")
} else {
builder.endControlFlow()
}
}
if (hasDenied) {
// Add the "permissionDenied" statement
builder.addStatement("%N()", onDenied!!.simpleString())
// Close the additional control flow potentially opened by a "never ask again" method
if (hasNeverAsk) {
builder.endControlFlow()
}
}
// Close the "switch" control flow
builder.endControlFlow()
// Remove the temporary pending request field, in case it was used for a method with parameters
if (hasParameters) {
if (hasOnRationaleParams) {
builder.addStatement("%N = null", pendingRequestFieldName(needsMethod))
} else {
needsMethod.parameters.forEach {
builder.addStatement("%N = null", needsMethod.argumentFieldName(it))
}
}
}
}
private fun hasNormalPermission(rpe: RuntimePermissionsElement): Boolean {
rpe.needsElements.forEach {
val permissionValue = it.getAnnotation(NeedsPermission::class.java).permissionValue()
if (!permissionValue.contains(MANIFEST_SYSTEM_ALERT_WINDOW) && !permissionValue.contains(MANIFEST_WRITE_SETTING)) {
return true
}
}
return false
}
private fun isDefinePermission(rpe: RuntimePermissionsElement, permissionName: String): Boolean {
rpe.needsElements.forEach {
val permissionValue: List<String> = it.getAnnotation(NeedsPermission::class.java).permissionValue()
if (permissionValue.contains(permissionName)) {
return true
}
}
return false
}
private fun createPermissionRequestClasses(rpe: RuntimePermissionsElement): List<TypeSpec> {
val classes = arrayListOf<TypeSpec>()
rpe.needsElements.forEach {
val onRationale = rpe.findOnRationaleForNeeds(it)
if (onRationale != null || it.parameters.isNotEmpty()) {
classes.add(createPermissionRequestClass(rpe, it))
}
}
return classes
}
private fun createPermissionRequestClass(rpe: RuntimePermissionsElement, needsMethod: ExecutableElement): TypeSpec {
// Select the superinterface of the generated class
// based on whether or not the annotated method has parameters
val hasParameters = needsMethod.parameters.isNotEmpty()
val superInterfaceName = if (hasParameters) "GrantableRequest" else "PermissionRequest"
val builder = TypeSpec.classBuilder(permissionRequestTypeName(rpe, needsMethod))
.addOriginatingElement(rpe.element)
.addTypeVariables(rpe.ktTypeVariables)
.addSuperinterface(ClassName("permissions.dispatcher", superInterfaceName))
.addModifiers(KModifier.PRIVATE)
// Add required fields to the target
val propName = "weakTarget"
val parameterType = WEAK_REFERENCE.plusParameter(rpe.ktTypeName)
val propertySpec = PropertySpec.builder(propName, parameterType, KModifier.PRIVATE)
propertySpec.initializer("%T(target)", WEAK_REFERENCE)
builder.addProperty(propertySpec.build())
needsMethod.parameters.forEach {
builder.addProperty(
PropertySpec.builder(it.simpleString(), it.asPreparedType(), KModifier.PRIVATE)
.initializer(CodeBlock.of(it.simpleString()))
.build()
)
}
// Add constructor
val targetParam = "target"
val constructorSpec = FunSpec.constructorBuilder().addParameter(targetParam, rpe.ktTypeName)
needsMethod.parameters.forEach {
constructorSpec.addParameter(it.simpleString(), it.asPreparedType(), KModifier.PRIVATE)
}
builder.primaryConstructor(constructorSpec.build())
// Add proceed() override
val proceedFun = FunSpec.builder("proceed")
.addOriginatingElement(rpe.element)
.addModifiers(KModifier.OVERRIDE)
.addStatement("val target = %N.get() ?: return", propName)
val requestCodeField = requestCodeFieldName(needsMethod)
ADD_WITH_CHECK_BODY_MAP[needsMethod.getAnnotation(NeedsPermission::class.java).value[0]]?.addRequestPermissionsStatement(proceedFun, targetParam, getActivityName(targetParam), requestCodeField)
?: addRequestPermissionsStatement(proceedFun, targetParam, permissionFieldName(needsMethod), requestCodeField)
builder.addFunction(proceedFun.build())
// Add cancel() override method
val cancelFun = FunSpec.builder("cancel")
.addOriginatingElement(rpe.element)
.addModifiers(KModifier.OVERRIDE)
val onDenied = rpe.findOnDeniedForNeeds(needsMethod)
if (onDenied != null) {
cancelFun
.addStatement("val target = %N.get() ?: return", propName)
.addStatement("target.%N()", onDenied.simpleString())
}
builder.addFunction(cancelFun.build())
// For classes with additional parameters, add a "grant()" method
if (hasParameters) {
val grantFun = FunSpec.builder("grant")
.addOriginatingElement(rpe.element)
.addModifiers(KModifier.OVERRIDE)
.addStatement("val target = %N.get() ?: return", propName)
// Compose the call to the permission-protected method;
// since the number of parameters is variable, utilize the low-level CodeBlock here
// to compose the method call and its parameters
grantFun.addCode(
CodeBlock.builder()
.add("target.%N(", needsMethod.simpleString())
.add(varargsKtParametersCodeBlock(needsMethod))
.addStatement(")")
.build()
)
builder.addFunction(grantFun.build())
}
return builder.build()
}
}