spin-mobile/lib/services/lock_service.dart

import "package:flutter/foundation.dart";
import "package:local_auth/local_auth.dart";
import "package:shared_preferences/shared_preferences.dart";

/// 생체인증 잠금 설정/검증.
class LockService {
  LockService._();
  static final LockService instance = LockService._();

  static const _key = "spin.bioLock";
  final _auth = LocalAuthentication();

  Future<bool> isEnabled() async {
    final p = await SharedPreferences.getInstance();
    return p.getBool(_key) ?? false;
  }

  Future<void> setEnabled(bool v) async {
    final p = await SharedPreferences.getInstance();
    await p.setBool(_key, v);
  }

  Future<bool> canCheck() async {
    try {
      return await _auth.isDeviceSupported() && await _auth.canCheckBiometrics;
    } catch (_) {
      return false;
    }
  }

  Future<bool> authenticate() async {
    try {
      return await _auth.authenticate(
        localizedReason: "spin 잠금을 해제하려면 인증하세요",
        options: const AuthenticationOptions(stickyAuth: true, biometricOnly: false),
      );
    } catch (e) {
      debugPrint("lock: auth 오류 $e");
      return false;
    }
  }
}