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app/lib/features/user/domain/services/local_authentication.dart

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+import 'dart:async';
+
+import 'package:flutter/services.dart';
+import 'package:lensai/core/logger.dart';
+import 'package:lensai/features/geckoview/features/tabs/data/models/container_data.dart';
+import 'package:local_auth/local_auth.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'local_authentication.g.dart';
+
+@Riverpod(keepAlive: true)
+class LocalAuthenticationService extends _$LocalAuthenticationService {
+  final _auth = LocalAuthentication();
+  final _cache = <String, (DateTime, ContainerAuthSettings)>{};
+
+  bool _cacheAuth(String authKey) {
+    final auth = _cache[authKey];
+    if (auth != null && auth.$2.lockTimeout != null) {
+      return DateTime.now().difference(auth.$1) < auth.$2.lockTimeout!;
+    }
+
+    return false;
+  }
+
+  void evictCacheOnBackground() {
+    _cache.removeWhere(
+      (key, value) => value.$2.lockOnAppBackground,
+    );
+  }
+
+  Future<bool> authenticate({
+    required String authKey,
+    required String localizedReason,
+    ContainerAuthSettings? settings,
+    bool useAuthCache = false,
+  }) async {
+    try {
+      var result = useAuthCache && _cacheAuth(authKey);
+
+      if (!result) {
+        result = await _auth.authenticate(
+          localizedReason: localizedReason,
+        );
+      }
+
+      if (result && settings != null) {
+        _cache[authKey] = (DateTime.now(), settings);
+      }
+
+      return result;
+    } on PlatformException catch (e, s) {
+      logger.e('Could not authenticate', error: e, stackTrace: s);
+      return false;
+    }
+  }
+
+  @override
+  Future<bool> build() {
+    return _auth.canCheckBiometrics;
+  }
+}

app/lib/features/user/domain/services/local_authentication.g.dart

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+// GENERATED CODE - DO NOT MODIFY BY HAND
+
+part of 'local_authentication.dart';
+
+// **************************************************************************
+// RiverpodGenerator
+// **************************************************************************
+
+String _$localAuthenticationServiceHash() =>
+    r'4893be7a11833d77a575f7aa248a9ba65d6717da';
+
+/// See also [LocalAuthenticationService].
+@ProviderFor(LocalAuthenticationService)
+final localAuthenticationServiceProvider =
+    AsyncNotifierProvider<LocalAuthenticationService, bool>.internal(
+  LocalAuthenticationService.new,
+  name: r'localAuthenticationServiceProvider',
+  debugGetCreateSourceHash: const bool.fromEnvironment('dart.vm.product')
+      ? null
+      : _$localAuthenticationServiceHash,
+  dependencies: null,
+  allTransitiveDependencies: null,
+);
+
+typedef _$LocalAuthenticationService = AsyncNotifier<bool>;
+// ignore_for_file: type=lint
+// ignore_for_file: subtype_of_sealed_class, invalid_use_of_internal_member, invalid_use_of_visible_for_testing_member, deprecated_member_use_from_same_package