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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.service.v33
import android.app.job.JobScheduler
import android.content.Context
import android.os.Build
import android.provider.DeviceConfig
import android.util.Log
import android.util.Xml
import androidx.annotation.RequiresApi
import com.android.permissioncontroller.DeviceUtils
import com.android.permissioncontroller.PermissionControllerApplication
import com.android.permissioncontroller.permission.data.v33.PermissionDecision
import com.android.permissioncontroller.permission.service.BasePermissionEventStorage
import com.android.permissioncontroller.permission.service.PermissionEventStorage
import com.android.permissioncontroller.permission.utils.Utils
import java.io.IOException
import java.io.InputStream
import java.io.OutputStream
import java.nio.charset.StandardCharsets
import java.text.ParseException
import java.text.SimpleDateFormat
import java.util.Date
import java.util.Locale
import java.util.concurrent.TimeUnit
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.GlobalScope
import kotlinx.coroutines.launch
import org.xmlpull.v1.XmlPullParser
import org.xmlpull.v1.XmlPullParserException
/** Implementation of [BasePermissionEventStorage] for storing [PermissionDecision] events. */
@RequiresApi(Build.VERSION_CODES.TIRAMISU)
class PermissionDecisionStorageImpl(
context: Context,
jobScheduler: JobScheduler = context.getSystemService(JobScheduler::class.java)!!
) : BasePermissionEventStorage<PermissionDecision>(context, jobScheduler) {
// We don't use namespaces
private val ns: String? = null
/** The format for how dates are stored. */
private val dateFormat = SimpleDateFormat("yyyy-MM-dd", Locale.US)
companion object {
private const val LOG_TAG = "PermissionDecisionStorageImpl"
private const val DB_VERSION = 1
/** Config store file name for general shared store file. */
private const val STORE_FILE_NAME = "recent_permission_decisions.xml"
private const val TAG_RECENT_PERMISSION_DECISIONS = "recent-permission-decisions"
private const val TAG_PERMISSION_DECISION = "permission-decision"
private const val ATTR_VERSION = "version"
private const val ATTR_PACKAGE_NAME = "package-name"
private const val ATTR_PERMISSION_GROUP = "permission-group-name"
private const val ATTR_DECISION_TIME = "decision-time"
private const val ATTR_IS_GRANTED = "is-granted"
private val DEFAULT_MAX_DATA_AGE_MS = TimeUnit.DAYS.toMillis(7)
@Volatile private var INSTANCE: PermissionEventStorage<PermissionDecision>? = null
fun getInstance(): PermissionEventStorage<PermissionDecision> =
INSTANCE ?: synchronized(this) { INSTANCE ?: createInstance().also { INSTANCE = it } }
private fun createInstance(): PermissionEventStorage<PermissionDecision> {
return PermissionDecisionStorageImpl(PermissionControllerApplication.get())
}
fun recordPermissionDecision(
context: Context,
packageName: String,
permGroupName: String,
isGranted: Boolean
) {
if (isRecordPermissionsSupported(context)) {
GlobalScope.launch(Dispatchers.IO) {
getInstance()
.storeEvent(
PermissionDecision(
packageName,
System.currentTimeMillis(),
permGroupName,
isGranted
)
)
}
}
}
fun isRecordPermissionsSupported(context: Context): Boolean {
return DeviceUtils.isAuto(context)
}
}
override fun serialize(stream: OutputStream, events: List<PermissionDecision>) {
val out = Xml.newSerializer()
out.setOutput(stream, StandardCharsets.UTF_8.name())
out.startDocument(/* encoding= */ null, /* standalone= */ true)
out.startTag(ns, TAG_RECENT_PERMISSION_DECISIONS)
out.attribute(/* namespace= */ null, ATTR_VERSION, DB_VERSION.toString())
for (decision in events) {
out.startTag(ns, TAG_PERMISSION_DECISION)
out.attribute(ns, ATTR_PACKAGE_NAME, decision.packageName)
out.attribute(ns, ATTR_PERMISSION_GROUP, decision.permissionGroupName)
val date = dateFormat.format(Date(decision.eventTime))
out.attribute(ns, ATTR_DECISION_TIME, date)
out.attribute(ns, ATTR_IS_GRANTED, decision.isGranted.toString())
out.endTag(ns, TAG_PERMISSION_DECISION)
}
out.endTag(/* namespace= */ null, TAG_RECENT_PERMISSION_DECISIONS)
out.endDocument()
}
override fun parse(inputStream: InputStream): List<PermissionDecision> {
inputStream.use {
val parser: XmlPullParser = Xml.newPullParser()
parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false)
parser.setInput(inputStream, /* inputEncoding= */ null)
parser.nextTag()
return readRecentDecisions(parser)
}
}
@Throws(XmlPullParserException::class, IOException::class)
private fun readRecentDecisions(parser: XmlPullParser): List<PermissionDecision> {
val entries = mutableListOf<PermissionDecision>()
parser.require(XmlPullParser.START_TAG, ns, TAG_RECENT_PERMISSION_DECISIONS)
while (parser.next() != XmlPullParser.END_TAG) {
readPermissionDecision(parser)?.let { entries.add(it) }
}
return entries
}
@Throws(XmlPullParserException::class, IOException::class)
private fun readPermissionDecision(parser: XmlPullParser): PermissionDecision? {
var decision: PermissionDecision? = null
parser.require(XmlPullParser.START_TAG, ns, TAG_PERMISSION_DECISION)
try {
val packageName = parser.getAttributeValueNullSafe(ns, ATTR_PACKAGE_NAME)
val permissionGroup = parser.getAttributeValueNullSafe(ns, ATTR_PERMISSION_GROUP)
val decisionDate = parser.getAttributeValueNullSafe(ns, ATTR_DECISION_TIME)
val decisionTime =
dateFormat.parse(decisionDate)?.time
?: throw IllegalArgumentException(
"Could not parse date $decisionDate on package $packageName"
)
val isGranted = parser.getAttributeValueNullSafe(ns, ATTR_IS_GRANTED).toBoolean()
decision = PermissionDecision(packageName, decisionTime, permissionGroup, isGranted)
} catch (e: XmlPullParserException) {
Log.e(LOG_TAG, "Unable to parse permission decision", e)
} catch (e: ParseException) {
Log.e(LOG_TAG, "Unable to parse permission decision", e)
} catch (e: IllegalArgumentException) {
Log.e(LOG_TAG, "Unable to parse permission decision", e)
} finally {
parser.nextTag()
parser.require(XmlPullParser.END_TAG, ns, TAG_PERMISSION_DECISION)
}
return decision
}
@Throws(XmlPullParserException::class)
private fun XmlPullParser.getAttributeValueNullSafe(namespace: String?, name: String): String {
return this.getAttributeValue(namespace, name)
?: throw XmlPullParserException(
"Could not find attribute: namespace $namespace, name $name"
)
}
override fun getDatabaseFileName(): String {
return STORE_FILE_NAME
}
override fun getMaxDataAgeMs(): Long {
return DeviceConfig.getLong(
DeviceConfig.NAMESPACE_PERMISSIONS,
Utils.PROPERTY_PERMISSION_DECISIONS_MAX_DATA_AGE_MILLIS,
DEFAULT_MAX_DATA_AGE_MS
)
}
override fun hasTheSamePrimaryKey(
first: PermissionDecision,
second: PermissionDecision
): Boolean {
return first.packageName == second.packageName &&
first.permissionGroupName == second.permissionGroupName
}
override fun PermissionDecision.copyWithTimeDelta(timeDelta: Long): PermissionDecision {
return this.copy(eventTime = this.eventTime + timeDelta)
}
}
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