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Commit b631c17b authored by Eugene Susla's avatar Eugene Susla
Browse files

Treat first boot time as a usage event 

This allows us to not rely on usage data being backed up/restored

Test: presubmit
Bug: 153607914
Change-Id: I66d5c255eb09e0e8c8e2cc22cea85e31ffebe466
parent 97aaeaf9

src/com/android/permissioncontroller/permission/service/AutoRevokePermissions.kt

+26 −0
Original line number Diff line number Diff line
@@ -42,6 +42,7 @@ import android.content.BroadcastReceiver 
import android.content.ComponentName

import android.content.Context

import android.content.Intent

import android.content.SharedPreferences

import android.content.pm.PackageManager.FLAG_PERMISSION_AUTO_REVOKED

import android.content.pm.PackageManager.FLAG_PERMISSION_USER_SET

import android.content.pm.PackageManager.PERMISSION_GRANTED
@@ -54,6 +55,7 @@ import android.provider.DeviceConfig 
import android.provider.Settings

import android.util.Log

import androidx.annotation.MainThread

import androidx.preference.PreferenceManager

import com.android.permissioncontroller.Constants

import com.android.permissioncontroller.Constants.ACTION_MANAGE_AUTO_REVOKE

import com.android.permissioncontroller.Constants.AUTO_REVOKE_NOTIFICATION_ID
@@ -119,6 +121,8 @@ private fun getCheckFrequencyMs(context: Context) = when { 
private val SERVER_LOG_ID =

    PERMISSION_GRANT_REQUEST_RESULT_REPORTED__RESULT__AUTO_UNUSED_APP_PERMISSION_REVOKED



private val PREF_KEY_FIRST_BOOT_TIME = "first_boot_time"



fun isAutoRevokeEnabled(context: Context): Boolean {

    return getCheckFrequencyMs(context) > 0 &&

            getUnusedThresholdMs(context) > 0 &&
@@ -131,6 +135,9 @@ fun isAutoRevokeEnabled(context: Context): Boolean { 
class AutoRevokeOnBootReceiver : BroadcastReceiver() {



    override fun onReceive(context: Context, intent: Intent?) {

        // Init firstBootTime

        val firstBootTime = context.firstBootTime



        if (DEBUG) {

            Log.i(LOG_TAG, "scheduleAutoRevokePermissions " +

                "with frequency ${getCheckFrequencyMs(context)}ms " +
@@ -171,6 +178,7 @@ private suspend fun revokePermissionsOnUnusedApps(context: Context): 
    }



    val now = System.currentTimeMillis()

    val firstBootTime = context.firstBootTime



    val unusedApps = AllPackageInfosLiveData.getInitializedValue(staleOk = true).toMutableMap()
@@ -193,6 +201,9 @@ private suspend fun revokePermissionsOnUnusedApps(context: Context): 
            // Limit by install time

            lastTimeVisible = Math.max(lastTimeVisible, packageInfo.firstInstallTime)



            // Limit by first boot time

            lastTimeVisible = Math.max(lastTimeVisible, firstBootTime)



            // Handle cross-profile apps

            if (context.isPackageCrossProfile(pkgName)) {

                for ((otherUser, otherStats) in userStats) {
@@ -374,6 +385,21 @@ private fun Context.forParentUser(): Context { 


private inline fun <reified T> Context.getSystemService() = getSystemService(T::class.java)!!



val Context.sharedPreferences: SharedPreferences get() {

    return PreferenceManager.getDefaultSharedPreferences(this)

}



private val Context.firstBootTime: Long get() {

    var time = sharedPreferences.getLong(PREF_KEY_FIRST_BOOT_TIME, -1L)

    if (time > 0) {

        return time

    }

    // This is the first boot

    time = System.currentTimeMillis()

    sharedPreferences.edit().putLong(PREF_KEY_FIRST_BOOT_TIME, time).apply()

    return time

}



/**

 * A job to check for apps unused in the last [getUnusedThresholdMs]ms every

 * [getCheckFrequencyMs]ms and [revokePermissionsOnUnusedApps] for them