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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.app.AppOpsManager.permissionToOp
import android.app.Application
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.utils.Utils.getPlatformPermissionNamesOfGroup
import kotlin.collections.set
/**
* LiveData that loads the last usage of permission group for every package/attributionTag-pair.
*
* <p>This relies on app-ops data, hence this only works for platform defined permission groups.
*
* <p>For app-ops with duration the end of the access is considered.
*
* <p>Returns map perm-group-name -> {@link OpUsageLiveData.OpAccess}
*
* @param app The current application
* @param permGroupsNames The names of the permission groups we wish to search for
* @param usageDurationMs how much ago can an access have happened to be considered
*/
class PermGroupUsageLiveData(
private val app: Application,
private val permGroupsNames: List<String>,
private val usageDurationMs: Long
) : SmartUpdateMediatorLiveData<Map<String, List<OpAccess>>>() {
/** Perm group name -> OpUsageLiveData */
private val permGroupUsages = permGroupsNames.map { permGroup ->
val appops = getPlatformPermissionNamesOfGroup(permGroup).mapNotNull { permName ->
permissionToOp(permName)
}
permGroup to OpUsageLiveData(app, appops, usageDurationMs)
}.toMap()
init {
for (usage in permGroupUsages.values) {
addSource(usage) {
update()
}
}
}
override fun onUpdate() {
if (permGroupUsages.values.any { !it.isInitialized }) {
return
}
if (permGroupUsages.values.any { it.value == null }) {
value = null
return
}
// Only keep the last access for a permission group
value = permGroupUsages.map { (permGroupName, usageLiveData) ->
// (packageName, attributionTag) -> access
val lastAccess = mutableMapOf<Pair<String, String?>, OpAccess>()
for (access in usageLiveData.value!!.values.flatten()) {
val key = access.packageName to access.attributionTag
if (access.isRunning ||
lastAccess[key]?.lastAccessTime ?: 0 < access.lastAccessTime) {
lastAccess[key] = access
}
}
permGroupName to lastAccess.values.toList()
}.toMap()
}
companion object : DataRepository<Pair<List<String>, Long>, PermGroupUsageLiveData>() {
override fun newValue(key: Pair<List<String>, Long>): PermGroupUsageLiveData {
return PermGroupUsageLiveData(PermissionControllerApplication.get(), key.first,
key.second)
}
}
}
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