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src/FrontOffice.Main/Utilities/AuthService.cs

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+using Blazored.LocalStorage;
+using Microsoft.AspNetCore.Components;
+using MudBlazor;
+
+namespace FrontOffice.Main.Utilities;
+
+public class AuthService
+{
+    private readonly ILocalStorageService _localStorage;
+    private readonly NavigationManager _navigation;
+    private readonly ISnackbar _snackbar;
+
+    private const string TokenStorageKey = "auth:token";
+
+    public AuthService(ILocalStorageService localStorage, NavigationManager navigation, ISnackbar snackbar)
+    {
+        _localStorage = localStorage;
+        _navigation = navigation;
+        _snackbar = snackbar;
+    }
+
+    public async Task<bool> IsAuthenticatedAsync()
+    {
+        var token = await _localStorage.GetItemAsync<string>(TokenStorageKey);
+        return !string.IsNullOrWhiteSpace(token);
+    }
+
+    public async Task<string?> GetTokenAsync()
+    {
+        return await _localStorage.GetItemAsync<string>(TokenStorageKey);
+    }
+
+    public async Task LogoutAsync()
+    {
+        await _localStorage.RemoveItemAsync(TokenStorageKey);
+        await _localStorage.RemoveItemAsync("auth:phone-number");
+        await _localStorage.RemoveItemAsync("auth:redirect");
+        await _localStorage.RemoveItemAsync("referral:code");
+
+        _snackbar.Add("با موفقیت از حساب کاربری خارج شدید.", Severity.Success);
+        _navigation.NavigateTo(RouteConstants.Main.MainPage);
+    }
+
+    public async Task RequireAuthenticationAsync()
+    {
+        var isAuthenticated = await IsAuthenticatedAsync();
+        if (!isAuthenticated)
+        {
+            _snackbar.Add("لطفاً ابتدا وارد حساب کاربری شوید.", Severity.Warning);
+            _navigation.NavigateTo(RouteConstants.Main.MainPage);
+        }
+    }
+}