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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.
*/
@file:Suppress("DEPRECATION")
package com.android.permissioncontroller.permission.data
import android.app.Application
import android.content.pm.PackageManager
import android.os.UserHandle
import android.os.UserManager
import android.util.Log
import androidx.annotation.MainThread
import androidx.lifecycle.Observer
import com.android.modules.utils.build.SdkLevel
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.model.livedatatypes.LightPackageInfo
import com.android.permissioncontroller.permission.utils.Utils
import kotlinx.coroutines.Job
/**
* LiveData for a LightPackageInfo.
*
* @param app The current Application
* @param packageName The name of the package this LiveData will watch for mode changes for
* @param user The user for whom the packageInfo will be defined
*/
class LightPackageInfoLiveData
private constructor(
private val app: Application,
private val packageName: String,
private val user: UserHandle
) :
SmartAsyncMediatorLiveData<LightPackageInfo?>(alwaysUpdateOnActive = false),
PackageBroadcastReceiver.PackageBroadcastListener,
PermissionListenerMultiplexer.PermissionChangeCallback {
private val LOG_TAG = LightPackageInfoLiveData::class.java.simpleName
private val userPackagesLiveData = UserPackageInfosLiveData[user]
private var uid: Int? = null
/** The currently registered UID on which this LiveData is listening for permission changes. */
private var registeredUid: Int? = null
/** Whether or not this package livedata is watching the UserPackageInfosLiveData */
private var watchingUserPackagesLiveData: Boolean = false
/**
* Callback from the PackageBroadcastReceiver. Either deletes or generates package data.
*
* @param packageName the name of the package which was updated. Ignored in this method
*/
override fun onPackageUpdate(packageName: String) {
updateAsync()
}
override fun setValue(newValue: LightPackageInfo?) {
newValue?.let { packageInfo ->
if (packageInfo.uid != uid) {
uid = packageInfo.uid
if (hasActiveObservers()) {
PermissionListenerMultiplexer.addOrReplaceCallback(
registeredUid,
packageInfo.uid,
this
)
registeredUid = uid
}
}
}
super.setValue(newValue)
}
override fun updateAsync() {
// If we were watching the userPackageInfosLiveData, stop, since we will override its value
if (watchingUserPackagesLiveData) {
removeSource(userPackagesLiveData)
watchingUserPackagesLiveData = false
}
super.updateAsync()
}
override suspend fun loadDataAndPostValue(job: Job) {
if (job.isCancelled) {
return
}
postValue(
try {
var flags = PackageManager.GET_PERMISSIONS
if (SdkLevel.isAtLeastS()) {
flags = flags or PackageManager.GET_ATTRIBUTIONS
}
LightPackageInfo(
Utils.getUserContext(app, user)
.packageManager
.getPackageInfo(packageName, flags)
)
} catch (e: Exception) {
if (e is PackageManager.NameNotFoundException) {
Log.w(LOG_TAG, "Package \"$packageName\" not found for user $user")
} else {
val profiles = app.getSystemService(UserManager::class.java)!!.userProfiles
Log.e(
LOG_TAG,
"Failed to create context for user $user. " +
"User exists : ${user in profiles }",
e
)
}
invalidateSingle(packageName to user)
null
}
)
}
/** Callback from the PermissionListener. Either deletes or generates package data. */
override fun onPermissionChange() {
updateAsync()
}
override fun onActive() {
super.onActive()
PackageBroadcastReceiver.addChangeCallback(packageName, this)
uid?.let {
registeredUid = uid
PermissionListenerMultiplexer.addCallback(it, this)
}
if (
userPackagesLiveData.hasActiveObservers() &&
!watchingUserPackagesLiveData &&
!userPackagesLiveData.permChangeStale
) {
watchingUserPackagesLiveData = true
addSource(userPackagesLiveData, userPackageInfosObserver)
} else {
updateAsync()
}
}
private val userPackageInfosObserver =
Observer<List<LightPackageInfo>> { updateFromUserPackageInfosLiveData() }
@MainThread
private fun updateFromUserPackageInfosLiveData() {
if (!userPackagesLiveData.isInitialized) {
return
}
val packageInfo = userPackagesLiveData.value!!.find { it.packageName == packageName }
if (packageInfo != null) {
// Once we get one non-stale update, stop listening, as any further updates will likely
// be individual package updates.
if (!userPackagesLiveData.isStale) {
removeSource(UserPackageInfosLiveData[user])
watchingUserPackagesLiveData = false
}
value = packageInfo
} else {
// If the UserPackageInfosLiveData does not contain this package, check for removal, and
// stop watching.
updateAsync()
}
}
override fun onInactive() {
super.onInactive()
PackageBroadcastReceiver.removeChangeCallback(packageName, this)
registeredUid?.let {
PermissionListenerMultiplexer.removeCallback(it, this)
registeredUid = null
}
if (watchingUserPackagesLiveData) {
removeSource(userPackagesLiveData)
watchingUserPackagesLiveData = false
}
}
/**
* Repository for LightPackageInfoLiveDatas
*
* <p> Key value is a string package name and UserHandle pair, value is its corresponding
* LiveData.
*/
companion object :
DataRepositoryForPackage<Pair<String, UserHandle>, LightPackageInfoLiveData>() {
override fun newValue(key: Pair<String, UserHandle>): LightPackageInfoLiveData {
return LightPackageInfoLiveData(
PermissionControllerApplication.get(),
key.first,
key.second
)
}
}
}
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