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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.BroadcastReceiver
import android.content.Context
import android.content.Intent
import android.content.IntentFilter
import com.android.modules.utils.build.SdkLevel
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.data.v34.LightInstallSourceInfoLiveData
import com.android.permissioncontroller.permission.data.v34.SafetyLabelInfoLiveData
import kotlinx.coroutines.Dispatchers.Main
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
/**
* Listens for package additions, replacements, and removals, and notifies listeners.
*/
object PackageBroadcastReceiver : BroadcastReceiver() {
private val app: Application = PermissionControllerApplication.get()
private val intentFilter = IntentFilter(Intent.ACTION_PACKAGE_ADDED).apply {
addAction(Intent.ACTION_PACKAGE_REMOVED)
addAction(Intent.ACTION_PACKAGE_REPLACED)
addAction(Intent.ACTION_PACKAGE_CHANGED)
addDataScheme("package")
}
/**
* Map<packageName, callbacks listenening to package>
*/
private val changeCallbacks = mutableMapOf<String, MutableSet<PackageBroadcastListener>>()
/**
* A list of listener IDs, which listen to all package additions, changes, and removals.
*/
private val allCallbacks = mutableSetOf<PackageBroadcastListener>()
/**
* Add a callback which will be notified when the specified packaged is changed or removed.
*/
fun addChangeCallback(packageName: String, listener: PackageBroadcastListener) {
GlobalScope.launch(Main.immediate) {
val wasEmpty = hasNoListeners()
changeCallbacks.getOrPut(packageName, { mutableSetOf() }).add(listener)
if (wasEmpty) {
app.applicationContext.registerReceiverForAllUsers(this@PackageBroadcastReceiver,
intentFilter, null, null)
}
}
}
/**
* Add a callback which will be notified any time a package is added, removed, or changed.
*
* @param listener the listener to be added
* @return returns the integer ID assigned to the
*/
fun addAllCallback(listener: PackageBroadcastListener) {
GlobalScope.launch(Main.immediate) {
val wasEmpty = hasNoListeners()
allCallbacks.add(listener)
if (wasEmpty) {
app.applicationContext.registerReceiverForAllUsers(this@PackageBroadcastReceiver,
intentFilter, null, null)
}
}
}
/**
* Removes a package add/remove/change callback.
*
* @param listener the listener we wish to remove
*/
fun removeAllCallback(listener: PackageBroadcastListener) {
GlobalScope.launch(Main.immediate) {
val wasEmpty = hasNoListeners()
if (allCallbacks.remove(listener) && hasNoListeners() && !wasEmpty) {
app.applicationContext.unregisterReceiver(this@PackageBroadcastReceiver)
}
}
}
/**
* Removes a change callback.
*
* @param packageName the package the listener is listening for
* @param listener the listener we wish to remove
*/
fun removeChangeCallback(packageName: String?, listener: PackageBroadcastListener) {
GlobalScope.launch(Main.immediate) {
val wasEmpty = hasNoListeners()
changeCallbacks[packageName]?.let { callbackSet ->
callbackSet.remove(listener)
if (callbackSet.isEmpty()) {
changeCallbacks.remove(packageName)
}
if (hasNoListeners() && !wasEmpty) {
app.applicationContext.unregisterReceiver(this@PackageBroadcastReceiver)
}
}
}
}
private fun getNumListeners(): Int {
var numListeners = allCallbacks.size
for ((_, changeCallbackSet) in changeCallbacks) {
numListeners += changeCallbackSet.size
}
return numListeners
}
private fun hasNoListeners(): Boolean {
return getNumListeners() == 0
}
/**
* Upon receiving a broadcast, rout it to the proper callbacks.
*
* @param context the context of the broadcast
* @param intent data about the broadcast which was sent
*/
override fun onReceive(context: Context, intent: Intent) {
val packageName = intent.data?.schemeSpecificPart ?: return
for (callback in allCallbacks.toList()) {
callback.onPackageUpdate(packageName)
}
if (intent.action != Intent.ACTION_PACKAGE_ADDED) {
changeCallbacks[packageName]?.toList()?.let { callbacks ->
for (callback in callbacks) {
callback.onPackageUpdate(packageName)
}
}
}
if (intent.action == Intent.ACTION_PACKAGE_REMOVED) {
// Invalidate all livedatas associated with this package
LightPackageInfoLiveData.invalidateAllForPackage(packageName)
PermStateLiveData.invalidateAllForPackage(packageName)
PackagePermissionsLiveData.invalidateAllForPackage(packageName)
HibernationSettingStateLiveData.invalidateAllForPackage(packageName)
LightAppPermGroupLiveData.invalidateAllForPackage(packageName)
AppPermGroupUiInfoLiveData.invalidateAllForPackage(packageName)
if (SdkLevel.isAtLeastU()) {
SafetyLabelInfoLiveData.invalidateAllForPackage(packageName)
LightInstallSourceInfoLiveData.invalidateAllForPackage(packageName)
}
}
}
/**
* A listener interface for objects desiring to be notified of package broadcasts.
*/
interface PackageBroadcastListener {
/**
* To be called when a specific package has been changed, or when any package has been
* installed.
*
* @param packageName the name of the package which was updated
*/
fun onPackageUpdate(packageName: String)
}
}
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