DeviceOwnerReceiver: Add minimal support for device owner API

SessionInstaller can commit silent installs if the app is device owner. Implemented on
request of users.

This still needs user to set the app as device owner manually using ADB (only possible
if the device has no accounts setup yet).

Co-authored-by: Syuugo <pub@s1204.me>
Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

app/src/main/AndroidManifest.xml

@@ -58,6 +58,10 @@
         android:name="android.hardware.gamepad"
         android:required="false"/>
 
+    <uses-feature
+        android:name="android.software.device_admin"
+        android:required="false" />
+
     <application
         android:name=".AuroraApp"
         android:allowBackup="true"
@@ -142,5 +146,18 @@
         <receiver
             android:name=".data.receiver.InstallerStatusReceiver"
             android:exported="false" />
+
+        <!-- SessionInstaller (as device owner) -->
+        <receiver
+            android:name=".data.receiver.DeviceOwnerReceiver"
+            android:permission="android.permission.BIND_DEVICE_ADMIN"
+            android:exported="true">
+            <meta-data
+                android:name="android.app.device_admin"
+                android:resource="@xml/device_owner_receiver" />
+            <intent-filter>
+                <action android:name="android.app.action.DEVICE_ADMIN_ENABLED" />
+            </intent-filter>
+        </receiver>
     </application>
 </manifest>

app/src/main/java/com/aurora/store/data/receiver/DeviceOwnerReceiver.kt

@@ -0,0 +1,5 @@
+package com.aurora.store.data.receiver
+
+import android.app.admin.DeviceAdminReceiver
+
+class DeviceOwnerReceiver : DeviceAdminReceiver()

app/src/main/java/com/aurora/store/util/Preferences.kt

@@ -47,6 +47,7 @@ object Preferences {
     const val PREFERENCE_DOWNLOADS_CACHE_TIME = "PREFERENCE_DOWNLOADS_CACHE_TIME"
     const val PREFERENCE_AUTO_DELETE = "PREFERENCE_AUTO_DELETE"
 
+    const val PREFERENCE_INSTALLATION_DEVICE_OWNER = "PREFERENCE_INSTALLATION_DEVICE_OWNER"
     const val INSTALLATION_ABANDON_SESSION = "INSTALLATION_ABANDON_SESSION"
 
     const val PREFERENCE_TOS_READ = "PREFERENCE_TOS_READ"

app/src/main/java/com/aurora/store/view/ui/preferences/InstallationPreference.kt

@@ -19,6 +19,9 @@
 
 package com.aurora.store.view.ui.preferences
 
+import android.app.admin.DevicePolicyManager
+import android.content.Context
+import android.content.DialogInterface
 import android.content.pm.PackageManager
 import android.os.Bundle
 import android.view.View
@@ -38,6 +41,7 @@ import com.aurora.store.util.CommonUtil
 import com.aurora.store.util.Log
 import com.aurora.store.util.PackageUtil
 import com.aurora.store.util.Preferences
+import com.aurora.store.util.Preferences.PREFERENCE_INSTALLATION_DEVICE_OWNER
 import com.aurora.store.util.save
 import com.aurora.store.view.custom.preference.AuroraListPreference
 import com.topjohnwu.superuser.Shell
@@ -72,6 +76,27 @@ class InstallationPreference : BasePreferenceFragment() {
 
     override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
         setPreferencesFromResource(R.xml.preferences_installation, rootKey)
+
+        findPreference<Preference>(PREFERENCE_INSTALLATION_DEVICE_OWNER)?.apply {
+            val packageName = context.packageName
+            val devicePolicyManager =
+                context.getSystemService(Context.DEVICE_POLICY_SERVICE) as DevicePolicyManager
+
+            isVisible = devicePolicyManager.isDeviceOwnerApp(packageName)
+            setOnPreferenceClickListener {
+                context.showDialog(
+                    context.getString(R.string.pref_clear_device_owner_title),
+                    context.getString(R.string.pref_clear_device_owner_desc),
+                    { _: DialogInterface, _: Int ->
+                        @Suppress("DEPRECATION")
+                        devicePolicyManager.clearDeviceOwnerApp(packageName)
+                        activity?.recreate()
+                    },
+                    { dialog: DialogInterface, _: Int -> dialog.dismiss() }
+                )
+                true
+            }
+        }
     }
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {

app/src/main/res/values/strings.xml

@@ -439,4 +439,9 @@
     <!-- DownloadPreference -->
     <string name="pref_download_cache_title">Keep downloads cache</string>
     <string name="pref_download_cache_summary">How long to preserve downloads cache (failed, cancelled and completed), in hours</string>
+
+    <!-- InstallationPreference -->
+    <string name="pref_clear_device_owner_title">Clear device owner</string>
+    <string name="pref_clear_device_owner_summary">Removes Aurora Store as the device owner app</string>
+    <string name="pref_clear_device_owner_desc">This will revoke session installer\'s permission to silently install app. Proceed with clearing device ownership?</string>
 </resources>

app/src/main/res/xml/device_owner_receiver.xml

@@ -0,0 +1,2 @@
+<?xml version="1.0" encoding="utf-8"?>
+<device-admin />

app/src/main/res/xml/preferences_installation.xml

@@ -41,6 +41,13 @@
         app:summary="@string/pref_abandon_session_desc"
         app:title="@string/pref_abandon_session" />
 
+    <Preference
+        app:iconSpaceReserved="false"
+        app:isPreferenceVisible="false"
+        app:key="PREFERENCE_INSTALLATION_DEVICE_OWNER"
+        app:summary="@string/pref_clear_device_owner_summary"
+        app:title="@string/pref_clear_device_owner_title" />
+
     <ListPreference
         app:defaultValue="0"
         app:iconSpaceReserved="false"