Compass app (#2446)

compass_app/app/lib/data/services/shared_preferences_service.dart

@@ -0,0 +1,41 @@
+// Copyright 2024 The Flutter team. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:logging/logging.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+import '../../utils/result.dart';
+
+class SharedPreferencesService {
+  static const _tokenKey = 'TOKEN';
+  final _log = Logger('SharedPreferencesService');
+
+  Future<Result<String?>> fetchToken() async {
+    try {
+      final sharedPreferences = await SharedPreferences.getInstance();
+      _log.finer('Got token from SharedPreferences');
+      return Result.ok(sharedPreferences.getString(_tokenKey));
+    } on Exception catch (e) {
+      _log.warning('Failed to get token', e);
+      return Result.error(e);
+    }
+  }
+
+  Future<Result<void>> saveToken(String? token) async {
+    try {
+      final sharedPreferences = await SharedPreferences.getInstance();
+      if (token == null) {
+        _log.finer('Removed token');
+        await sharedPreferences.remove(_tokenKey);
+      } else {
+        _log.finer('Replaced token');
+        await sharedPreferences.setString(_tokenKey, token);
+      }
+      return Result.ok(null);
+    } on Exception catch (e) {
+      _log.warning('Failed to set token', e);
+      return Result.error(e);
+    }
+  }
+}