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/*
* Copyright (C) 2019 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.app.Application
import android.content.pm.PackageInfo
import android.content.pm.PackageManager
import android.os.UserHandle
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.model.livedatatypes.LightPackageInfo
import com.android.permissioncontroller.permission.model.livedatatypes.PermState
import com.android.permissioncontroller.permission.utils.ContextCompat
import com.android.permissioncontroller.permission.utils.KotlinUtils
import com.android.permissioncontroller.permission.utils.Utils
import kotlinx.coroutines.Job
/**
* A LiveData which tracks the permission state for one permission group for one package. It
* includes both the granted state of every permission in the group, and the flags stored in the
* PermissionController service.
*
* @param app The current application
* @param packageName The name of the package this LiveData will watch for mode changes for
* @param permGroupName The name of the permission group whose app ops this LiveData will watch
* @param user The user of the package
*/
class PermStateLiveData
private constructor(
private val app: Application,
private val packageName: String,
private val permGroupName: String,
private val user: UserHandle,
private val deviceId: Int
) :
SmartAsyncMediatorLiveData<Map<String, PermState>>(),
PermissionListenerMultiplexer.PermissionChangeCallback {
private val context =
Utils.getUserContext(app, user).let {
if (deviceId == ContextCompat.DEVICE_ID_DEFAULT) {
it
} else ContextCompat.createDeviceContext(it, deviceId)
}
private val packageInfoLiveData = LightPackageInfoLiveData[packageName, user, deviceId]
private val groupLiveData = PermGroupLiveData[permGroupName]
private var uid: Int? = null
private var registeredUid: Int? = null
init {
addSource(packageInfoLiveData) {
checkForUidUpdate(it)
updateAsync()
}
addSource(groupLiveData) { updateAsync() }
}
/**
* Gets the system flags from the package manager, and the grant state from those flags, plus
* the RequestedPermissionFlags of the PermState.
*/
override suspend fun loadDataAndPostValue(job: Job) {
if (!packageInfoLiveData.isInitialized || !groupLiveData.isInitialized) {
return
}
val packageInfo = packageInfoLiveData.value
val permissionGroup = groupLiveData.value
if (packageInfo == null || permissionGroup == null) {
invalidateSingle(KotlinUtils.Quadruple(packageName, permGroupName, user, deviceId))
postValue(null)
return
}
val permissionStates = mutableMapOf<String, PermState>()
for ((index, permissionName) in packageInfo.requestedPermissions.withIndex()) {
permissionGroup.permissionInfos[permissionName]?.let { permInfo ->
val packageFlags = packageInfo.requestedPermissionsFlags[index]
val permFlags =
context.packageManager.getPermissionFlags(permInfo.name, packageName, user)
val granted =
packageFlags and PackageInfo.REQUESTED_PERMISSION_GRANTED != 0 &&
permFlags and PackageManager.FLAG_PERMISSION_REVOKED_COMPAT == 0
if (job.isCancelled) {
return
}
permissionStates[permissionName] = PermState(permFlags, granted)
}
}
postValue(permissionStates)
}
override fun onPermissionChange() {
updateAsync()
}
private fun checkForUidUpdate(packageInfo: LightPackageInfo?) {
if (packageInfo == null) {
registeredUid?.let { PermissionListenerMultiplexer.removeCallback(it, this) }
return
}
uid = packageInfo.uid
if (uid != registeredUid && hasActiveObservers()) {
PermissionListenerMultiplexer.addOrReplaceCallback(registeredUid, packageInfo.uid, this)
registeredUid = uid
}
}
override fun onInactive() {
super.onInactive()
registeredUid?.let {
PermissionListenerMultiplexer.removeCallback(it, this)
registeredUid = null
}
}
override fun onActive() {
super.onActive()
uid?.let {
PermissionListenerMultiplexer.addCallback(it, this)
registeredUid = uid
}
}
/**
* Repository for PermStateLiveDatas.
*
* <p> Key value is a triple of string package name, string permission group name, and
* UserHandle, value is its corresponding LiveData.
*/
companion object :
DataRepositoryForDevice<
KotlinUtils.Quadruple<String, String, UserHandle, Int>, PermStateLiveData
>() {
override fun newValue(
key: KotlinUtils.Quadruple<String, String, UserHandle, Int>,
deviceId: Int
): PermStateLiveData {
return PermStateLiveData(
PermissionControllerApplication.get(),
key.first,
key.second,
key.third,
deviceId
)
}
}
}
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