[Safety Labels] Add skeleton job + notification

Create the SafetyLabelChangesJobService. The goal of this service is to
to create a notification once per month warning the user if any safety
labels data policy changes have occurred. (And, in the future, other
tasks.)

This job is scheduled after every reboot, if and only if the
SAFETY_LABEL_CHANGE_NOTIFICATIONS_ENABLED and
PERMISSION_RATIONALE_ENABLED flags are both enabled.

Change-Id: Iff0a7e0441cdb23079458ce4824bea09749ca12f
Test: atest SafetyLabelChangesJobServiceTest
Bug: 261662686
Bug: 262751896

2 files changed, 225 insertions, 0 deletions

diff --git a/PermissionController/src/com/android/permissioncontroller/permission/service/v34/SafetyLabelChangesJobService.kt b/PermissionController/src/com/android/permissioncontroller/permission/service/v34/SafetyLabelChangesJobService.kt
new file mode 100644
index 000000000..dfc30b3fe
--- /dev/null
+++ b/PermissionController/src/com/android/permissioncontroller/permission/service/v34/SafetyLabelChangesJobService.kt
@@ -0,0 +1,207 @@
+/*
+ * Copyright (C) 2023 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.v34
+
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.job.JobInfo
+import android.app.job.JobParameters
+import android.app.job.JobScheduler
+import android.app.job.JobService
+import android.content.BroadcastReceiver
+import android.content.ComponentName
+import android.content.Context
+import android.content.Intent
+import android.content.Intent.ACTION_BOOT_COMPLETED
+import android.os.Build
+import android.util.Log
+import androidx.annotation.RequiresApi
+import androidx.core.app.NotificationCompat
+import com.android.permissioncontroller.Constants.PERIODIC_SAFETY_LABEL_CHANGES_JOB_ID
+import com.android.permissioncontroller.Constants.PERMISSION_REMINDER_CHANNEL_ID
+import com.android.permissioncontroller.Constants.SAFETY_LABEL_CHANGES_JOB_ID
+import com.android.permissioncontroller.Constants.SAFETY_LABEL_CHANGES_NOTIFICATION_ID
+import com.android.permissioncontroller.PermissionControllerApplication
+import com.android.permissioncontroller.R
+import com.android.permissioncontroller.permission.utils.KotlinUtils
+import com.android.permissioncontroller.permission.utils.Utils.getSystemServiceSafe
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.GlobalScope
+import kotlinx.coroutines.launch
+
+/**
+ * Runs a monthly job that performs Safety Labels-related tasks, e.g., data policy changes
+ * notification, hygiene, etc.
+ */
+@RequiresApi(Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
+class SafetyLabelChangesJobService : JobService() {
+    class Receiver : BroadcastReceiver() {
+        override fun onReceive(context: Context, intent: Intent) {
+            if (!KotlinUtils.isSafetyLabelChangeNotificationsEnabled()) {
+                return
+            }
+            if (intent.action != ACTION_BOOT_COMPLETED) {
+                return
+            }
+            Log.i(LOG_TAG, "Received broadcast")
+            schedulePeriodicJob(context)
+        }
+    }
+
+    /**
+     * Called twice each interval, first for the periodic job
+     * [PERIODIC_SAFETY_LABEL_CHANGES_JOB_ID], then for the main job [SAFETY_LABEL_CHANGES_JOB_ID].
+     */
+    override fun onStartJob(params: JobParameters): Boolean {
+        if (!KotlinUtils.isSafetyLabelChangeNotificationsEnabled()) {
+            return false
+        }
+        when (params.jobId) {
+            PERIODIC_SAFETY_LABEL_CHANGES_JOB_ID -> scheduleMainJobWithDelay()
+            SAFETY_LABEL_CHANGES_JOB_ID -> {
+                dispatchMainJobTask(params)
+                return true
+            }
+            else -> Log.w(LOG_TAG, "Unexpected job ID")
+        }
+        return false
+    }
+
+    private fun dispatchMainJobTask(params: JobParameters) {
+        GlobalScope.launch(Dispatchers.Default) {
+            try {
+                Log.i(LOG_TAG, "Job started")
+                runMainJob()
+                Log.i(LOG_TAG, "Job finished successfully")
+            } catch (e: Throwable) {
+                Log.e(LOG_TAG, "Job failed", e)
+                throw e
+            } finally {
+                jobFinished(params, false)
+            }
+        }
+    }
+
+    private fun runMainJob() {
+        postSafetyLabelChangedNotification()
+    }
+
+    private fun postSafetyLabelChangedNotification() {
+        if (hasDataSharingChanged()) {
+            Log.i(LOG_TAG, "Showing notification: data sharing has changed")
+            showNotification()
+        } else {
+            Log.i(LOG_TAG, "Not showing notification: data sharing has not changed")
+        }
+    }
+
+    override fun onStopJob(params: JobParameters?): Boolean = true
+
+    private fun hasDataSharingChanged(): Boolean {
+        // TODO(b/261663886): Check whether data sharing has changed
+        return true
+    }
+
+    private fun showNotification() {
+        val context = PermissionControllerApplication.get() as Context
+        val notificationManager = getSystemServiceSafe(context, NotificationManager::class.java)
+
+        createNotificationChannel(context, notificationManager)
+
+        val notification =
+            NotificationCompat.Builder(context, PERMISSION_REMINDER_CHANNEL_ID)
+                .setSmallIcon(R.drawable.ic_info)
+                .setContentTitle(
+                    context.getString(R.string.safety_label_changes_notification_title))
+                .setContentText(context.getString(R.string.safety_label_changes_notification_desc))
+                .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                .setLocalOnly(true)
+                .setAutoCancel(true)
+                .setSilent(true)
+                .build()
+
+        notificationManager.notify(SAFETY_LABEL_CHANGES_NOTIFICATION_ID, notification)
+    }
+
+    private fun createNotificationChannel(
+        context: Context,
+        notificationManager: NotificationManager
+    ) {
+        val notificationChannel =
+            NotificationChannel(
+                PERMISSION_REMINDER_CHANNEL_ID,
+                context.getString(R.string.permission_reminders),
+                NotificationManager.IMPORTANCE_LOW)
+
+        notificationManager.createNotificationChannel(notificationChannel)
+    }
+
+    companion object {
+        private val LOG_TAG = SafetyLabelChangesJobService::class.java.simpleName
+
+        private fun schedulePeriodicJob(context: Context) {
+            try {
+                val jobScheduler = getSystemServiceSafe(context, JobScheduler::class.java)
+
+                if (jobScheduler.getPendingJob(PERIODIC_SAFETY_LABEL_CHANGES_JOB_ID) != null) {
+                    Log.i(LOG_TAG, "Not scheduling periodic job: already scheduled")
+                    return
+                }
+
+                Log.i(LOG_TAG, "Scheduling periodic job")
+                val job =
+                    JobInfo.Builder(
+                        PERIODIC_SAFETY_LABEL_CHANGES_JOB_ID,
+                        ComponentName(context, SafetyLabelChangesJobService::class.java))
+                    .setPersisted(true)
+                    .setPeriodic(KotlinUtils.getSafetyLabelChangesJobIntervalMillis())
+                    .build()
+                jobScheduler.schedule(job)
+                Log.i(LOG_TAG, "Periodic job scheduled successfully")
+            } catch (e: Throwable) {
+                Log.e(LOG_TAG, "Failed to schedule periodic job", e)
+                throw e
+            }
+        }
+
+        private fun scheduleMainJobWithDelay() {
+            try {
+                val context = PermissionControllerApplication.get() as Context
+                val jobScheduler = getSystemServiceSafe(context, JobScheduler::class.java)
+
+                if (jobScheduler.getPendingJob(SAFETY_LABEL_CHANGES_JOB_ID) != null) {
+                    Log.i(LOG_TAG, "Not scheduling job: already scheduled")
+                    return
+                }
+
+                Log.i(LOG_TAG, "Scheduling job")
+                val job =
+                    JobInfo.Builder(
+                        SAFETY_LABEL_CHANGES_JOB_ID,
+                        ComponentName(context, SafetyLabelChangesJobService::class.java))
+                    .setPersisted(true)
+                    .setMinimumLatency(KotlinUtils.getSafetyLabelChangesJobDelayMillis())
+                    .build()
+                jobScheduler.schedule(job)
+                Log.i(LOG_TAG, "Job scheduled successfully")
+            } catch (e: Throwable) {
+                Log.e(LOG_TAG, "Failed to schedule job", e)
+                throw e
+            }
+        }
+    }
+}
diff --git a/PermissionController/src/com/android/permissioncontroller/permission/service/v34/package-info.java b/PermissionController/src/com/android/permissioncontroller/permission/service/v34/package-info.java
new file mode 100644
index 000000000..0625654c0
--- /dev/null
+++ b/PermissionController/src/com/android/permissioncontroller/permission/service/v34/package-info.java
@@ -0,0 +1,18 @@
+/*
+ * Copyright (C) 2023 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.
+ */
+
+@androidx.annotation.RequiresApi(android.os.Build.VERSION_CODES.UPSIDE_DOWN_CAKE)
+package com.android.permissioncontroller.permission.service.v34;