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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.
*/
@file:Suppress("DEPRECATION")
package com.android.permissioncontroller.permission.data
import android.app.AppOpsManager
import android.app.AppOpsManager.OP_FLAGS_ALL_TRUSTED
import android.app.Application
import android.os.Parcel
import android.os.Parcelable
import android.os.UserHandle
import android.util.Log
import com.android.permissioncontroller.PermissionControllerApplication
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.Job
import kotlinx.coroutines.delay
import kotlinx.coroutines.launch
/**
* LiveData that loads the last usage of each of a list of app ops for every package.
*
* <p>For app-ops with duration the end of the access is considered.
*
* <p>Returns map op-name -> {@link OpAccess}
*
* @param app The current application
* @param opNames The names of the app ops we wish to search for
* @param usageDurationMs how much ago can an access have happened to be considered
*/
class OpUsageLiveData(
private val app: Application,
private val opNames: List<String>,
private val usageDurationMs: Long
) : SmartAsyncMediatorLiveData<@JvmSuppressWildcards Map<String, List<OpAccess>>>(),
AppOpsManager.OnOpActiveChangedListener {
private val appOpsManager = app.getSystemService(AppOpsManager::class.java)!!
override suspend fun loadDataAndPostValue(job: Job) {
val now = System.currentTimeMillis()
val opMap = mutableMapOf<String, MutableList<OpAccess>>()
val packageOps = try {
appOpsManager.getPackagesForOps(opNames.toTypedArray())
} catch (e: NullPointerException) {
// older builds might not support all the app-ops requested
emptyList<AppOpsManager.PackageOps>()
}
for (packageOp in packageOps) {
for (opEntry in packageOp.ops) {
for ((attributionTag, attributedOpEntry) in opEntry.attributedOpEntries) {
val user = UserHandle.getUserHandleForUid(packageOp.uid)
val lastAccessTime: Long = attributedOpEntry.getLastAccessTime(
OP_FLAGS_ALL_TRUSTED)
if (lastAccessTime == -1L) {
// There was no access, so skip
continue
}
var lastAccessDuration = attributedOpEntry.getLastDuration(OP_FLAGS_ALL_TRUSTED)
// Some accesses have no duration
if (lastAccessDuration == -1L) {
lastAccessDuration = 0
}
if (attributedOpEntry.isRunning ||
lastAccessTime + lastAccessDuration > (now - usageDurationMs)) {
val accessList = opMap.getOrPut(opEntry.opStr) { mutableListOf() }
val accessTime = if (attributedOpEntry.isRunning) {
OpAccess.IS_RUNNING
} else {
lastAccessTime
}
val proxy = attributedOpEntry.getLastProxyInfo(OP_FLAGS_ALL_TRUSTED)
var proxyAccess: OpAccess? = null
if (proxy != null && proxy.packageName != null) {
proxyAccess = OpAccess(proxy.packageName!!, proxy.attributionTag,
UserHandle.getUserHandleForUid(proxy.uid), accessTime)
}
accessList.add(OpAccess(packageOp.packageName, attributionTag,
user, accessTime, proxyAccess))
// TODO ntmyren: remove logs once b/160724034 is fixed
Log.i("OpUsageLiveData", "adding ${opEntry.opStr} for " +
"${packageOp.packageName}/$attributionTag, access time of " +
"$lastAccessTime, isRunning: ${attributedOpEntry.isRunning} " +
"current time $now, duration $lastAccessDuration, proxy: " +
"${proxy?.packageName}")
} else {
Log.i("OpUsageLiveData", "NOT adding ${opEntry.opStr} for " +
"${packageOp.packageName}/$attributionTag, access time of " +
"$lastAccessTime, isRunning: ${attributedOpEntry.isRunning} " +
"current time $now, duration $lastAccessDuration")
}
}
}
}
postValue(opMap)
}
override fun onActive() {
super.onActive()
// appOpsManager.startWatchingNoted() is not exposed, hence force update regularly :-(
GlobalScope.launch {
while (hasActiveObservers()) {
delay(1000)
update()
}
}
try {
appOpsManager.startWatchingActive(opNames.toTypedArray(), { it.run() }, this)
} catch (ignored: IllegalArgumentException) {
// older builds might not support all the app-ops requested
}
}
override fun onInactive() {
super.onInactive()
appOpsManager.stopWatchingActive(this)
}
override fun onOpActiveChanged(op: String, uid: Int, packageName: String, active: Boolean) {
update()
}
companion object : DataRepository<Pair<List<String>, Long>, OpUsageLiveData>() {
override fun newValue(key: Pair<List<String>, Long>): OpUsageLiveData {
return OpUsageLiveData(PermissionControllerApplication.get(), key.first, key.second)
}
operator fun get(ops: List<String>, usageDurationMs: Long): OpUsageLiveData {
return get(ops to usageDurationMs)
}
}
}
data class OpAccess(
val packageName: String,
val attributionTag: String?,
val user: UserHandle,
val lastAccessTime: Long,
val proxyAccess: OpAccess? = null
) : Parcelable {
val isRunning = lastAccessTime == IS_RUNNING
override fun writeToParcel(parcel: Parcel, flags: Int) {
parcel.writeString(packageName)
parcel.writeString(attributionTag)
parcel.writeParcelable(user, flags)
parcel.writeLong(lastAccessTime)
parcel.writeString(proxyAccess?.packageName)
parcel.writeString(proxyAccess?.attributionTag)
parcel.writeParcelable(proxyAccess?.user, flags)
}
override fun describeContents(): Int {
return 0
}
companion object {
const val IS_RUNNING = -1L
@JvmField
val CREATOR = object : Parcelable.Creator<OpAccess> {
override fun createFromParcel(parcel: Parcel): OpAccess {
val packageName = parcel.readString()!!
val attributionTag = parcel.readString()
val user: UserHandle = parcel.readParcelable(UserHandle::class.java.classLoader)!!
val lastAccessTime = parcel.readLong()
var proxyAccess: OpAccess? = null
val proxyPackageName = parcel.readString()
if (proxyPackageName != null) {
proxyAccess = OpAccess(proxyPackageName,
parcel.readString(),
parcel.readParcelable(UserHandle::class.java.classLoader)!!,
lastAccessTime)
}
return OpAccess(packageName, attributionTag, user, lastAccessTime, proxyAccess)
}
override fun newArray(size: Int): Array<OpAccess?> {
return arrayOfNulls(size)
}
}
}
}
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