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/*
* Copyright (C) 2021 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("DEPRECATION")
package com.android.permissioncontroller.permission.data
import android.app.Application
import android.app.admin.DeviceAdminReceiver
import android.content.Intent
import android.content.pm.PackageManager
import android.os.UserHandle
import com.android.permissioncontroller.DumpableLog
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.hibernation.DEBUG_HIBERNATION_POLICY
import com.android.permissioncontroller.permission.utils.Utils.getUserContext
import kotlinx.coroutines.Job
/**
* A LiveData which tracks broadcast receivers for a certain type
*
* @param app The current application
* @param intentAction The name of the action the receiver receives
* @param permission The permission required for the receiver
* @param user The user the receivers should be determined for
*/
class BroadcastReceiverLiveData(
private val app: Application,
override val intentAction: String,
private val permission: String,
private val user: UserHandle
) :
SmartAsyncMediatorLiveData<Set<String>>(),
PackageBroadcastReceiver.PackageBroadcastListener,
HasIntentAction {
private val name = intentAction.substringAfterLast(".")
private val enabledDeviceAdminsLiveDataLiveData = EnabledDeviceAdminsLiveData[user]
init {
if (intentAction == DeviceAdminReceiver.ACTION_DEVICE_ADMIN_ENABLED) {
addSource(enabledDeviceAdminsLiveDataLiveData) { updateAsync() }
}
}
override fun onPackageUpdate(packageName: String) {
updateAsync()
}
override suspend fun loadDataAndPostValue(job: Job) {
if (job.isCancelled) {
return
}
if (
intentAction == DeviceAdminReceiver.ACTION_DEVICE_ADMIN_ENABLED &&
!enabledDeviceAdminsLiveDataLiveData.isInitialized
) {
return
}
val packageNames =
getUserContext(app, user)
.packageManager
.queryBroadcastReceivers(
Intent(intentAction),
PackageManager.GET_RECEIVERS or PackageManager.GET_META_DATA
)
.mapNotNull { resolveInfo ->
if (resolveInfo?.activityInfo?.permission != permission) {
return@mapNotNull null
}
val packageName = resolveInfo.activityInfo?.packageName
if (!isReceiverEnabled(packageName)) {
if (DEBUG_HIBERNATION_POLICY) {
DumpableLog.i(
LOG_TAG,
"Not exempting $packageName - not an active $name " +
"for u${user.identifier}"
)
}
return@mapNotNull null
}
packageName
}
.toSet()
if (DEBUG_HIBERNATION_POLICY) {
DumpableLog.i(
LOG_TAG,
"Detected ${intentAction.substringAfterLast(".")}s: $packageNames"
)
}
postValue(packageNames)
}
private fun isReceiverEnabled(pkg: String?): Boolean {
if (pkg == null) {
return false
}
return when (intentAction) {
DeviceAdminReceiver.ACTION_DEVICE_ADMIN_ENABLED -> {
pkg in enabledDeviceAdminsLiveDataLiveData.value!!
}
else -> true
}
}
override fun onActive() {
super.onActive()
PackageBroadcastReceiver.addAllCallback(this)
}
override fun onInactive() {
super.onInactive()
PackageBroadcastReceiver.removeAllCallback(this)
}
/**
* Repository for [BroadcastReceiverLiveData]
*
* <p> Key value is a (string intent action, required permission, user) triple, value is its
* corresponding LiveData.
*/
companion object :
DataRepositoryForPackage<Triple<String, String, UserHandle>, BroadcastReceiverLiveData>() {
private const val LOG_TAG = "BroadcastReceiverLiveData"
override fun newValue(key: Triple<String, String, UserHandle>): BroadcastReceiverLiveData {
return BroadcastReceiverLiveData(
PermissionControllerApplication.get(),
key.first,
key.second,
key.third
)
}
}
}
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