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/*
* Copyright (C) 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.
*/
package com.android.permissioncontroller.permission.data
import android.content.pm.PackageInfo
import android.content.pm.PackageManager.FLAG_PERMISSION_AUTO_REVOKED
import android.os.Build
import android.os.UserHandle
import android.util.Log
import com.android.permissioncontroller.permission.utils.KotlinUtils
import com.android.permissioncontroller.permission.utils.PermissionMapping
import kotlinx.coroutines.Dispatchers.Main
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.launch
/**
* Tracks which packages have been auto-revoked, and which groups have been auto revoked for those
* packages.
*
* ```(packageName, user) -> [groupName]```
*/
object AutoRevokedPackagesLiveData :
SmartAsyncMediatorLiveData<Map<Pair<String, UserHandle>, Set<String>>>() {
private val LOG_TAG = AutoRevokedPackagesLiveData::class.java.simpleName
init {
addSource(AllPackageInfosLiveData) { update() }
}
private val permStateLiveDatas =
mutableMapOf<Triple<String, String, UserHandle>, PermStateLiveData>()
private val packageAutoRevokedPermsList =
mutableMapOf<Pair<String, UserHandle>, MutableSet<String>>()
override suspend fun loadDataAndPostValue(job: Job) {
if (!AllPackageInfosLiveData.isInitialized) {
return
}
val allPackageGroups = mutableSetOf<Triple<String, String, UserHandle>>()
for ((user, packageList) in AllPackageInfosLiveData.value ?: emptyMap()) {
for (pkg in packageList) {
if (job.isCancelled) {
return
}
val pkgGroups = mutableSetOf<Triple<String, String, UserHandle>>()
for ((idx, requestedPerm) in pkg.requestedPermissions.withIndex()) {
val group =
PermissionMapping.getGroupOfPlatformPermission(requestedPerm) ?: continue
val granted =
(pkg.requestedPermissionsFlags[idx] and
PackageInfo.REQUESTED_PERMISSION_GRANTED) != 0
if (pkg.targetSdkVersion < Build.VERSION_CODES.M || !granted) {
pkgGroups.add(Triple(pkg.packageName, group, user))
}
}
allPackageGroups.addAll(pkgGroups)
}
}
if (allPackageGroups.isEmpty()) {
postCopyOfMap()
} else {
observePermStateLiveDatas(allPackageGroups)
}
}
private fun observePermStateLiveDatas(packageGroups: Set<Triple<String, String, UserHandle>>) {
GlobalScope.launch(Main.immediate) {
val (toAdd, toRemove) =
KotlinUtils.getMapAndListDifferences(packageGroups, permStateLiveDatas)
for (packagePermGroup in toRemove) {
removeSource(permStateLiveDatas.remove(packagePermGroup) ?: continue)
val packageUser = packagePermGroup.first to packagePermGroup.third
packageAutoRevokedPermsList[packageUser]?.remove(packagePermGroup.second)
if (packageAutoRevokedPermsList[packageUser]?.isEmpty() == true) {
packageAutoRevokedPermsList.remove(packageUser)
}
}
if (toRemove.isNotEmpty()) {
postCopyOfMap()
}
for (packagePermGroup in toAdd) {
permStateLiveDatas[packagePermGroup] = PermStateLiveData[packagePermGroup]
}
for (packagePermGroup in toAdd) {
val permStateLiveData = permStateLiveDatas[packagePermGroup]!!
val packageUser = packagePermGroup.first to packagePermGroup.third
addSource(permStateLiveData) { permState ->
var added = false
if (permState == null && permStateLiveData.isInitialized) {
permStateLiveDatas.remove(packagePermGroup)
removeSource(permStateLiveData)
} else if (permState != null) {
for ((_, state) in permState) {
if (state.permFlags and FLAG_PERMISSION_AUTO_REVOKED != 0) {
packageAutoRevokedPermsList
.getOrPut(packageUser) { mutableSetOf() }
.add(packagePermGroup.second)
added = true
break
}
}
}
if (!added) {
packageAutoRevokedPermsList[packageUser]?.remove(packagePermGroup.second)
if (packageAutoRevokedPermsList[packageUser]?.isEmpty() == true) {
packageAutoRevokedPermsList.remove(packageUser)
}
}
if (permStateLiveDatas.all { it.value.isInitialized }) {
postCopyOfMap()
}
}
}
}
}
private fun postCopyOfMap() {
val autoRevokedCopy = mutableMapOf<Pair<String, UserHandle>, Set<String>>()
for ((userPackage, permGroups) in packageAutoRevokedPermsList) {
autoRevokedCopy[userPackage] = permGroups.toSet()
}
Log.i(LOG_TAG, "postValue: $autoRevokedCopy")
postValue(autoRevokedCopy)
}
}
private val autoRevokedPackagesSetLiveData =
object : SmartUpdateMediatorLiveData<Set<Pair<String, UserHandle>>>() {
init {
addSource(AutoRevokedPackagesLiveData) { update() }
}
override fun onUpdate() {
if (!AutoRevokedPackagesLiveData.isInitialized) {
return
}
value = AutoRevokedPackagesLiveData.value!!.keys
}
}
val unusedAutoRevokePackagesLiveData = UnusedPackagesLiveData(autoRevokedPackagesSetLiveData)
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