Stephan D
27424ed886
Provide reusable models, injectable service contracts, lifecycle-safe providers and explicit dummy implementations for login, signup and verification. Add focused error and async lifecycle tests. Related to #4 and #5.
47 lines
1.3 KiB
Dart
47 lines
1.3 KiB
Dart
import 'package:flutter/foundation.dart';
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import '../models/auth.dart';
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/// Shared operation lifecycle adapted from Sendico's ChangeNotifier providers.
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/// Reset invalidates pending results; it does not cancel service-side work.
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abstract class AuthProvider extends ChangeNotifier {
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AuthState _state = const AuthState.idle();
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int _generation = 0;
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bool _disposed = false;
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AuthState get state => _state;
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@protected
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Future<void> run(Future<AuthResult> Function() operation) async {
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if (_disposed || _state.isLoading) return;
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final generation = ++_generation;
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_state = const AuthState.loading();
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notifyListeners();
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try {
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final result = await operation();
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if (_disposed || generation != _generation) return;
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_state = AuthState.success(result);
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} catch (error) {
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if (_disposed || generation != _generation) return;
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// Never retain or expose arbitrary exceptions that may contain credentials.
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_state = AuthState.failure(
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error is AuthException ? error.code : AuthError.unexpected,
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);
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}
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if (!_disposed && generation == _generation) notifyListeners();
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}
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void reset() {
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if (_disposed) return;
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++_generation;
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_state = const AuthState.idle();
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notifyListeners();
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}
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@override
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void dispose() {
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_disposed = true;
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++_generation;
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super.dispose();
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}
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}
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