Dmitry
a559d6de3e
Адрес бэкенда хранится в shared_preferences и читается до runApp; switchApiBaseUrl сбрасывает токены и кэш старого сервера. Выход стирает refresh-токен и sqlite-кэш ответов. Экран настроек переделан под разделы.
59 lines
2.4 KiB
Dart
59 lines
2.4 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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const _prefsKey = 'api_base_url';
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/// Backend origin when the user has not chosen one. Override at build time:
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/// `flutter run --dart-define=API_BASE_URL=https://fin.example.com`.
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/// On web the default is the page's own origin (Caddy serves app and API together).
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String defaultApiBaseUrl() {
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const fromEnv = String.fromEnvironment('API_BASE_URL');
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if (fromEnv.isNotEmpty) return fromEnv;
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if (kIsWeb) return Uri.base.origin;
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return 'http://127.0.0.1:8000';
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}
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/// The address saved on this device, read in `main()` before `runApp`. Loading it up front,
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/// rather than lazily like the theme, matters: the session restore fires a request on
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/// startup and it must already go to the right server.
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Future<String?> loadStoredApiBaseUrl() async =>
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(await SharedPreferences.getInstance()).getString(_prefsKey);
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/// Overridden in `main()` with [loadStoredApiBaseUrl]; null (tests, nothing saved) means default.
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final initialApiBaseUrlProvider = Provider<String?>((_) => null);
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/// Backend origin every client is built against. Watched by `apiProvider` and
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/// `authDioProvider`, so changing it rebuilds them. To switch servers use
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/// `switchApiBaseUrl`: tokens and cached data belong to the old one.
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final apiBaseUrlProvider = NotifierProvider<ApiBaseUrlController, String>(
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ApiBaseUrlController.new,
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);
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class ApiBaseUrlController extends Notifier<String> {
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@override
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String build() => ref.watch(initialApiBaseUrlProvider) ?? defaultApiBaseUrl();
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/// [input] as an origin-like URL without a trailing slash, or null if it is not an
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/// absolute http(s) URL.
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static String? normalize(String input) {
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final uri = Uri.tryParse(input.trim());
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if (uri == null || !uri.hasAuthority || uri.host.isEmpty) return null;
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if (uri.scheme != 'http' && uri.scheme != 'https') return null;
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final s = uri.toString();
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return s.endsWith('/') ? s.substring(0, s.length - 1) : s;
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}
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/// Persists [url]; null goes back to [defaultApiBaseUrl].
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Future<void> save(String? url) async {
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final prefs = await SharedPreferences.getInstance();
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if (url == null) {
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await prefs.remove(_prefsKey);
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state = defaultApiBaseUrl();
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} else {
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await prefs.setString(_prefsKey, url);
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state = url;
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}
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}
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}
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