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path: root/PermissionController/src/com/android/permissioncontroller/permission/data/v31/AllLightPackageOpsLiveData.kt
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/*
 * Copyright (C) 2022 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.v31

import android.app.AppOpsManager
import android.app.AppOpsManager.OPSTR_PHONE_CALL_CAMERA
import android.app.AppOpsManager.OPSTR_PHONE_CALL_MICROPHONE
import android.app.AppOpsManager.OPSTR_RECEIVE_AMBIENT_TRIGGER_AUDIO
import android.app.Application
import android.os.UserHandle
import android.os.UserManager
import com.android.modules.utils.build.SdkLevel
import com.android.permissioncontroller.permission.data.SmartAsyncMediatorLiveData
import com.android.permissioncontroller.permission.data.StandardPermGroupNamesLiveData
import com.android.permissioncontroller.permission.model.livedatatypes.v31.LightPackageOps
import com.android.permissioncontroller.permission.utils.PermissionMapping
import kotlinx.coroutines.Job

/**
 * LiveData class tracking [LightPackageOps] for all packages on the device and for all system
 * permission groups' ops.
 *
 * App ops data is retrieved from [AppOpsManager] and is updated whenever app ops data changes are
 * heard.
 */
class AllLightPackageOpsLiveData(app: Application) :
    SmartAsyncMediatorLiveData<Map<Pair<String, UserHandle>, LightPackageOps>>(),
    AppOpsManager.OnOpActiveChangedListener,
    AppOpsManager.OnOpNotedListener,
    AppOpsManager.OnOpChangedListener {

    private val appOpsManager = app.getSystemService(AppOpsManager::class.java)!!
    private val userManager = app.getSystemService(UserManager::class.java)!!
    private var opNames: MutableSet<String> =
        getOpNames(StandardPermGroupNamesLiveData.value).toMutableSet()

    init {
        addSource(StandardPermGroupNamesLiveData) {
            opNames = getOpNames(it).toMutableSet()
            opNames.add(OPSTR_PHONE_CALL_MICROPHONE)
            opNames.add(OPSTR_PHONE_CALL_CAMERA)
            if (SdkLevel.isAtLeastT()) {
                opNames.add(OPSTR_RECEIVE_AMBIENT_TRIGGER_AUDIO)
            }

            update()
        }
    }

    override fun onActive() {
        super.onActive()

        opNames.forEach { opName ->
            // TODO(b/262035952): We watch each active op individually as startWatchingActive only
            // registers the callback if all ops are valid. Fix this behavior so if one op is
            // invalid it doesn't affect the other ops.
            try {
                appOpsManager.startWatchingActive(arrayOf(opName), { it.run() }, this)
            } catch (ignored: IllegalArgumentException) {
                // Older builds may not support all requested app ops.
            }

            try {
                appOpsManager.startWatchingMode(opName, /* all packages */ null, this)
            } catch (ignored: IllegalArgumentException) {
                // Older builds may not support all requested app ops.
            }

            if (SdkLevel.isAtLeastU()) {
                try {
                    appOpsManager.startWatchingNoted(arrayOf(opName), this)
                } catch (ignored: IllegalArgumentException) {
                    // Older builds may not support all requested app ops.
                }
            }
        }
    }

    override fun onInactive() {
        super.onInactive()

        appOpsManager.stopWatchingActive(this)
        appOpsManager.stopWatchingMode(this)
    }

    override suspend fun loadDataAndPostValue(job: Job) {
        if (opNames.isEmpty()) {
            return
        }

        val packageOpsList =
            try {
                appOpsManager.getPackagesForOps(opNames.toTypedArray())
            } catch (e: NullPointerException) {
                // Older builds may not support all requested app ops.
                emptyList<AppOpsManager.PackageOps>()
            }

        val allProfilesInCurrentUser = userManager.userProfiles

        postValue(
            packageOpsList
                .filter { UserHandle.getUserHandleForUid(it.uid) in allProfilesInCurrentUser }
                .associateBy(
                    { Pair(it.packageName, UserHandle.getUserHandleForUid(it.uid)) },
                    { LightPackageOps(opNames, it) }))
    }

    override fun onOpChanged(op: String?, packageName: String?) {
        update()
    }

    override fun onOpActiveChanged(op: String, uid: Int, packageName: String, active: Boolean) {
        update()
    }

    override fun onOpNoted(
        code: String,
        uid: Int,
        packageName: String,
        attributionTag: String?,
        flags: Int,
        result: Int
    ) {
        update()
    }

    /** Returns all op names for all permissions in a list of permission groups. */
    private fun getOpNames(permissionGroupNames: List<String>?) =
        permissionGroupNames
            ?.flatMap { group -> PermissionMapping.getPlatformPermissionNamesOfGroup(group) }
            ?.mapNotNull { permName -> AppOpsManager.permissionToOp(permName) }
            ?.toSet()
            ?: setOf()
}