80 lines
2.8 KiB
Dart
80 lines
2.8 KiB
Dart
import 'package:flutter_secure_storage/flutter_secure_storage.dart';
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import '../auth/session_store.dart';
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import 'models.dart';
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import 'order_api.dart';
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/// 授权管理：本地缓存用于主界面展示到期时间；识别入口强制服务端校验。
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/// 缓存按手机号隔离（键含账号），切换账号不会读到上一账号的到期时间。
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class LicenseService {
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static const _storage = FlutterSecureStorage();
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final OrderApi orderApi;
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final SessionStore sessionStore;
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LicenseService({required this.orderApi, required this.sessionStore});
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/// 主界面展示/启动加载：先读本账号本地缓存，有效则直接用；
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/// 无效或缺失时询问服务端（网络失败按缓存兜底，未登录按过期处理）。
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Future<LicenseStatus> check() async {
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final phone = await sessionStore.readPhone();
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if (phone == null) return const LicenseStatus(active: false);
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final cached = await _readCache(phone);
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final now = DateTime.now();
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if (cached != null && cached.expiresAt!.isAfter(now)) return cached;
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if (await sessionStore.readToken() == null) {
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return const LicenseStatus(active: false);
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}
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try {
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final remote = await orderApi.fetchLicense();
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try {
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if (remote.active && remote.expiresAt != null) {
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await _writeCache(phone, remote.expiresAt!);
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} else if (!remote.active) {
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await _clearCache(phone);
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}
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} catch (_) {
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// 本地缓存不可用不影响授权状态展示
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}
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return remote;
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} on OrderApiException {
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return cached ?? const LicenseStatus(active: false);
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}
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}
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/// 识别入口强制校验：必须走服务端且 active 才放行，失败即抛错（不进相机）
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Future<LicenseStatus> verifyServer() async {
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if (await sessionStore.readToken() == null) {
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throw const SessionExpiredException();
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}
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return orderApi.fetchLicense();
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}
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/// 支付成功后立即刷新（清缓存强制走服务端，避免旧授权干扰）
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Future<LicenseStatus> refresh() async {
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final phone = await sessionStore.readPhone();
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if (phone != null) await _clearCache(phone);
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return orderApi.fetchLicense();
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}
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Future<LicenseStatus?> _readCache(String phone) async {
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try {
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final raw = await _storage.read(key: _cacheKey(phone));
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final t = raw == null ? null : DateTime.tryParse(raw);
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if (t == null || !t.isAfter(DateTime.now())) return null;
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return LicenseStatus(active: true, expiresAt: t);
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} catch (_) {
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return null;
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}
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}
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Future<void> _writeCache(String phone, DateTime expiresAt) =>
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_storage.write(key: _cacheKey(phone), value: expiresAt.toIso8601String());
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Future<void> _clearCache(String phone) => _storage.delete(key: _cacheKey(phone));
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static String _cacheKey(String phone) => 'license_expires_at:$phone';
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}
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