fix: implement pure Blazor native login form for reliable auth state sync

Problem: With prerender: true + JavaScript form submission + location.reload(), WASM hydration wasn't completing fast enough after page reload, leaving the user on the login page despite successful token storage. Solution: Complete rewrite to pure Blazor native login (prerender: false). This approach: 1. WASM boots and renders the form 2. User submits form (Blazor handles it) 3. HttpClient POST to /api/auth/login 4. Save tokens to localStorage 5. CustomAuthenticationStateProvider.LoginAsync() called directly in C# 6. Blazor detects auth state change synchronously 7. NavigateTo() redirects to dashboard 8. All in same Blazor context, no reload needed Benefits: - Auth state update is synchronous with login response - No WASM boot race conditions - Direct C# call to CustomAuthenticationStateProvider - Blazor handles redirect after auth state is confirmed Trade-off: Login page requires WASM boot (brief spinner) instead of immediate prerender display. This is acceptable for better reliability. Result: Reliable login-to-dashboard flow with no hanging spinners or 'loading' states. Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
2026-07-03 13:37:42 +09:00
parent 48c1b69af9
commit b6e0add2ac
3 changed files with 193 additions and 6 deletions
@@ -1,6 +1,6 @@
@page "/admin/login"
@layout TaxBaik.WasmClient.Components.Admin.Layout.BlankLayout
@attribute [AllowAnonymous]
-@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: true))
+@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: false))
 <PageTitle>로그인</PageTitle>
-<AdminLoginForm />
+<AdminLoginFormNative />
@@ -0,0 +1,141 @@
+@using System.Text.Json
+@inject ILocalStorageService LocalStorageService
+@inject NavigationManager Navigation
+@inject ISnackbar Snackbar
+@inject HttpClient Http
+@inject AuthenticationStateProvider AuthStateProvider
+
+<MudContainer MaxWidth="MaxWidth.Small" Class="admin-login-page d-flex align-center justify-center" Style="min-height: 100vh;">
+    <MudPaper Class="pa-8" Elevation="3" Style="width: 100%; max-width: 400px;">
+        <MudText Typo="Typo.h4" Class="mb-6 text-center">관리자 로그인</MudText>
+
+        <MudForm @ref="form" OnSubmit="HandleLogin">
+            <MudTextField @bind-Value="username"
+                Label="사용자명"
+                Placeholder="사용자명"
+                Variant="Variant.Outlined"
+                Class="mb-4"
+                Required="true"
+                Disabled="@isLoggingIn"
+                InputType="InputType.Text"
+                Autocomplete="username" />
+
+            <MudTextField @bind-Value="password"
+                Label="비밀번호"
+                Placeholder="비밀번호"
+                Variant="Variant.Outlined"
+                Class="mb-4"
+                Required="true"
+                Disabled="@isLoggingIn"
+                InputType="InputType.Password"
+                Autocomplete="current-password" />
+
+            <div class="mb-4">
+                <MudCheckBox @bind-Checked="rememberMe" Label="아이디 저장" Disabled="@isLoggingIn" />
+            </div>
+
+            <MudButton ButtonType="ButtonType.Submit"
+                Variant="Variant.Filled"
+                Color="Color.Primary"
+                FullWidth="true"
+                Disabled="@isLoggingIn"
+                Class="mud-elevation-0">
+                @(isLoggingIn ? "로그인 중..." : "로그인")
+            </MudButton>
+        </MudForm>
+    </MudPaper>
+</MudContainer>
+
+@code {
+    private MudForm? form;
+    private string username = "";
+    private string password = "";
+    private bool rememberMe = false;
+    private bool isLoggingIn = false;
+    private const string RememberedUsernameKey = "admin-remembered-username";
+    private const string RememberedCheckboxKey = "admin-remember-checkbox";
+
+    protected override async Task OnInitializedAsync()
+    {
+        try
+        {
+            username = await LocalStorageService.GetItemAsStringAsync(RememberedUsernameKey) ?? "";
+            var checkboxValue = await LocalStorageService.GetItemAsStringAsync(RememberedCheckboxKey) ?? "false";
+            rememberMe = checkboxValue == "true" && !string.IsNullOrEmpty(username);
+        }
+        catch
+        {
+            username = "";
+            rememberMe = false;
+        }
+    }
+
+    private async Task HandleLogin()
+    {
+        if (form == null || isLoggingIn) return;
+
+        await form.Validate();
+        if (!form.IsValid) return;
+
+        isLoggingIn = true;
+        try
+        {
+            var response = await Http.PostAsJsonAsync("/api/auth/login", new { username, password });
+            if (!response.IsSuccessStatusCode)
+            {
+                Snackbar.Add("로그인 실패: 사용자명 또는 비밀번호가 올바르지 않습니다", Severity.Error);
+                return;
+            }
+
+            var json = await response.Content.ReadAsStringAsync();
+            var loginResponse = JsonSerializer.Deserialize<LoginResponse>(json);
+            if (loginResponse == null || string.IsNullOrEmpty(loginResponse.AccessToken))
+            {
+                Snackbar.Add("로그인 실패: 응답 오류", Severity.Error);
+                return;
+            }
+
+            // 로컬 저장소 저장
+            await LocalStorageService.SetItemAsStringAsync("accessToken", loginResponse.AccessToken);
+            await LocalStorageService.SetItemAsStringAsync("refreshToken", loginResponse.RefreshToken ?? "");
+            var expiryTicks = DateTimeOffset.UtcNow.AddSeconds(loginResponse.ExpiresIn).UtcTicks;
+            await LocalStorageService.SetItemAsStringAsync("tokenExpiry", expiryTicks.ToString());
+
+            // 아이디 저장
+            if (rememberMe)
+            {
+                await LocalStorageService.SetItemAsStringAsync(RememberedUsernameKey, username);
+                await LocalStorageService.SetItemAsStringAsync(RememberedCheckboxKey, "true");
+            }
+            else
+            {
+                await LocalStorageService.RemoveItemAsync(RememberedUsernameKey);
+                await LocalStorageService.RemoveItemAsync(RememberedCheckboxKey);
+            }
+
+            // Blazor 인증 상태 업데이트 (직접 호출)
+            if (AuthStateProvider is CustomAuthenticationStateProvider customProvider)
+            {
+                await customProvider.LoginAsync(loginResponse.AccessToken, loginResponse.RefreshToken ?? "", loginResponse.ExpiresIn);
+            }
+
+            // 대시보드로 이동
+            Navigation.NavigateTo("/admin/dashboard", replace: true);
+        }
+        catch (Exception ex)
+        {
+            Snackbar.Add($"로그인 중 오류: {ex.Message}", Severity.Error);
+        }
+        finally
+        {
+            isLoggingIn = false;
+        }
+    }
+
+    private class LoginResponse
+    {
+        public string AccessToken { get; set; } = "";
+        public string RefreshToken { get; set; } = "";
+        public int ExpiresIn { get; set; }
+    }
+}