auth_guard.dart

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import 'dart:async';
 
import 'package:connect/core/router/auth_service.dart';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';
 
import 'routes.dart';
 
class AuthGuard extends GoRouteData {
  AuthGuard._();
 
  static final AuthGuard instance = AuthGuard._();
  final AuthService _authService = AuthService();
 
  @override
  FutureOr<String?> redirect(BuildContext context, GoRouterState state) async {
    final isAuthenticated = await _authService.isTokenValid();
    final isLoginRoute = state.matchedLocation == Routes.signIn.route;
 
    if (!isAuthenticated && !isLoginRoute) {
      return Routes.signIn.route;
    }
 
    if (isAuthenticated && isLoginRoute) {
      return Routes.mainMenu.route;
    }
 
    return null;
  }
}