Don't do the client side fallback if it's disabled in pref

app/lib/controller/account_controller.dart

@@ -108,6 +108,7 @@ class AccountController {
         KiwiContainer().resolve(),
         account: account,
         prefController: prefController,
+        serverController: serverController,
       );
 
   PrefController prefController;

app/lib/controller/metadata_controller.dart

@@ -3,6 +3,7 @@ import 'dart:async';
 import 'package:logging/logging.dart';
 import 'package:nc_photos/account.dart';
 import 'package:nc_photos/controller/pref_controller.dart';
+import 'package:nc_photos/controller/server_controller.dart';
 import 'package:nc_photos/db/entity_converter.dart';
 import 'package:nc_photos/di_container.dart';
 import 'package:nc_photos/entity/file_util.dart' as file_util;
@@ -17,6 +18,7 @@ class MetadataController {
     this._c, {
     required this.account,
     required this.prefController,
+    required this.serverController,
   }) {
     _subscriptions.add(
         prefController.isEnableClientExifChange.listen(_onSetEnableClientExif));
@@ -44,7 +46,12 @@ class MetadataController {
   void kickstart() {
     _log.info("[kickstart] Metadata controller enabled");
     _isEnable = true;
-    if (prefController.isEnableClientExifValue && !_hasStarted) {
+    // on NC28+, the service is needed to get metadata for files that are not
+    // yet available the moment we queried them, and files not supported by the
+    // server (if client side exif enabled).
+    if ((serverController.isSupported(ServerFeature.ncMetadata) ||
+            prefController.isEnableClientExifValue) &&
+        !_hasStarted) {
       _startMetadataTask();
     }
   }
@@ -72,7 +79,7 @@ class MetadataController {
       );
       _log.info("[_startMetadataTask] Missing count: $missingCount");
       if (missingCount > 0) {
-        unawaited(service.startService());
+        unawaited(service.startService(prefController: prefController));
       }
     } catch (e, stackTrace) {
       _log.shout(
@@ -87,6 +94,7 @@ class MetadataController {
   final DiContainer _c;
   final Account account;
   final PrefController prefController;
+  final ServerController serverController;
 
   final _subscriptions = <StreamSubscription>[];
   var _isEnable = false;

app/lib/service/config.dart

@@ -2,14 +2,22 @@ part of 'service.dart';
 
 class ServiceConfig {
   static Future<bool> isProcessExifWifiOnly() async {
-    return Preference.getBool(_pref, _prefProcessWifiOnly, true)
-        .notNull();
+    return Preference.getBool(_pref, _prefProcessWifiOnly, true).notNull();
   }
 
   static Future<void> setProcessExifWifiOnly(bool flag) async {
     await Preference.setBool(_pref, _prefProcessWifiOnly, flag);
   }
 
+  static Future<bool> isEnableClientExif() async {
+    return Preference.getBool(_pref, _prefIsEnableClientExif, false).notNull();
+  }
+
+  static Future<void> setEnableClientExif(bool flag) async {
+    await Preference.setBool(_pref, _prefIsEnableClientExif, flag);
+  }
+
   static const _pref = "service";
   static const _prefProcessWifiOnly = "shouldProcessWifiOnly";
+  static const _prefIsEnableClientExif = "isEnableClientExif";
 }

app/lib/service/service.dart

@@ -28,7 +28,9 @@ part 'l10n.dart';
 part 'service.g.dart';
 
 /// Start the background service
-Future<void> startService() async {
+Future<void> startService({
+  required PrefController prefController,
+}) async {
   _$__NpLog.log.info("[startService] Starting service");
   final service = FlutterBackgroundService();
   await service.configure(
@@ -46,7 +48,9 @@ Future<void> startService() async {
   );
   // sync settings
   await ServiceConfig.setProcessExifWifiOnly(
-      Pref().shouldProcessExifWifiOnlyOr());
+      prefController.shouldProcessExifWifiOnlyValue);
+  await ServiceConfig.setEnableClientExif(
+      prefController.isEnableClientExifValue);
   await service.start();
 }
 

app/lib/use_case/sync_metadata/sync_by_server.dart

@@ -41,12 +41,18 @@ class _SyncByServer {
       _log.fine("[_syncDir] Syncing dir $dir");
       final files = await fileRepoRemote.list(account, dir);
       await FileSqliteCacheUpdater(db)(account, dir, remote: files);
+      final isEnableClientExif = await ServiceConfig.isEnableClientExif();
       for (final f in files.where((e) => fileIds.contains(e.fdId))) {
         File? result;
         if (!_supportedMimes.contains(f.fdMime)) {
-          _log.info(
-              "[_syncDir] File ${f.path} (mime: ${f.fdMime}) not supported by server, fallback to client");
-          result = await fallback.syncOne(f);
+          if (isEnableClientExif) {
+            _log.info(
+                "[_syncDir] File ${f.path} (mime: ${f.fdMime}) not supported by server, fallback to client");
+            result = await fallback.syncOne(f);
+          } else {
+            _log.info(
+                "[_syncDir] File ${f.path} (mime: ${f.fdMime}) not supported by server");
+          }
         } else {
           if (f.metadata != null && f.location == null) {
             result = await _syncOne(f);