dotnet/skills

configure-auth

Add authentication and authorization to a Blazor Web App, accounting for the app's render mode.

Zobacz źródło
Oryginalny dokument Skill

Treść z repozytorium z zachowaniem nagłówków, przykładów, kodu, tabel, linków i obrazów.

Configure Auth

Step 1 — Read AGENTS.md

Read AGENTS.md at the workspace root for the project's interactivity mode and scope before making changes.

Step 2 — Register auth services in Program.cs

csharp
// Program.cs (server project)
builder.Services.AddCascadingAuthenticationState();
builder.Services.AddAuthorization();

For ASP.NET Core Identity add the Identity services:

csharp
builder.Services.AddAuthentication(options =>
{
    options.DefaultScheme = IdentityConstants.ApplicationScheme;
    options.DefaultSignInScheme = IdentityConstants.ExternalScheme;
})
.AddIdentityCookies();

builder.Services.AddIdentityCore<ApplicationUser>()
    .AddRoles<IdentityRole>()
    .AddEntityFrameworkStores<ApplicationDbContext>()
    .AddSignInManager()
    .AddDefaultTokenProviders();

Step 3 — Wire App.razor for auth and render mode

The App.razor component must use AuthorizeRouteView and conditionally apply the render mode so that pages excluded from interactive routing render statically.

razor
<!DOCTYPE html>
<html>
<head>
    <HeadOutlet @rendermode="RenderModeForPage" />
</head>
<body>
    <Routes @rendermode="RenderModeForPage" />
    <script src="_framework/blazor.web.js"></script>
</body>
</html>

@code {
    [CascadingParameter]
    public HttpContext HttpContext { get; set; } = default!;

    private IComponentRenderMode? RenderModeForPage =>
        HttpContext.AcceptsInteractiveRouting()
            ? InteractiveServer   // replace with the app's render mode
            : null;
}

In Routes.razor (or wherever the router lives), use AuthorizeRouteView:

razor
<Router AppAssembly="typeof(Program).Assembly">
    <Found Context="routeData">
        <AuthorizeRouteView RouteData="routeData"
                            DefaultLayout="typeof(Layout.MainLayout)">
            <NotAuthorized>
                @if (context.User.Identity?.IsAuthenticated != true)
                {
                    <RedirectToLogin />
                }
                else
                {
                    <p>You are not authorized to access this resource.</p>
                }
            </NotAuthorized>
        </AuthorizeRouteView>
        <FocusOnNavigate RouteData="routeData" Selector="h1" />
    </Found>
</Router>

Step 4 — Protect pages and components

[Authorize] attribute on pages

razor
@page "/admin"
@attribute [Authorize]

With roles or policies:

razor
@attribute [Authorize(Roles = "Admin")]
@attribute [Authorize(Policy = "RequireManager")]

AuthorizeView for conditional UI

razor
<AuthorizeView>
    <Authorized>Welcome, @context.User.Identity?.Name!</Authorized>
    <NotAuthorized><a href="Account/Login">Log in</a></NotAuthorized>
</AuthorizeView>

Role/policy variants:

razor
<AuthorizeView Roles="Admin,Manager">
    <Authorized>Admin content here</Authorized>
</AuthorizeView>

Access auth state in code

csharp
[CascadingParameter]
private Task<AuthenticationState>? AuthState { get; set; }

protected override async Task OnInitializedAsync()
{
    if (AuthState is not null)
    {
        var state = await AuthState;
        var isAdmin = state.User.IsInRole("Admin");
    }
}

Step 5 — Identity pages must stay static SSR

SignInManager and UserManager use HttpContext internally and throw in interactive components. Identity pages (login, register, manage) must render as static SSR.

In a globally interactive app, mark every Identity page:

razor
@page "/Account/Login"
@attribute [ExcludeFromInteractiveRouting]

This forces a full-page navigation (exits the interactive circuit) so the page renders through the static SSR pipeline with a real HttpContext.

App.razor must use AcceptsInteractiveRouting() (Step 3) to return null for these pages — otherwise the framework still tries to render them interactively.

In a per-page app, Identity pages are static by default (no @rendermode directive), so [ExcludeFromInteractiveRouting] is not needed.

Step 6 — Auth state in WebAssembly / Auto mode

WebAssembly components run in the browser and have no HttpContext. Auth state must be serialized from the server during prerendering and deserialized on the client.

Server `Program.cs`:

csharp
builder.Services.AddAuthenticationStateSerialization();

Client `.Client/Program.cs`:

csharp
builder.Services.AddAuthenticationStateDeserialization();

Without these calls, Task<AuthenticationState> resolves to an anonymous user after WebAssembly takes over from prerendering.

AddAuthenticationStateSerialization accepts options to include role and claim data:

csharp
builder.Services.AddAuthenticationStateSerialization(options =>
    options.SerializeAllClaims = true);

Render Mode × Auth Matrix

Render modeHttpContext.UserSignInManagerAuth state sourceKey requirement
Static SSRAvailableWorksServer pipelineUse middleware for redirects, <NotAuthorized> does NOT render
Server (interactive)NOT availableThrowsCascadingAuthenticationStateUse [Authorize] + AuthorizeView, not HttpContext
WebAssemblyNOT availableThrowsSerialized from serverAddAuthenticationStateSerialization / Deserialization
AutoNOT available after WASMThrowsSerialized from serverSame as WebAssembly; register in both Program.cs files

Common Mistakes

MistakeSymptomFix
Using HttpContext.User in interactive componentNull or stale claimsUse [CascadingParameter] Task<AuthenticationState>
SignInManager in interactive componentInvalidOperationExceptionMove to static SSR page with [ExcludeFromInteractiveRouting]
Missing AddAuthenticationStateSerializationAnonymous user after WASM loadsAdd to server Program.cs; add Deserialization to client Program.cs
<NotAuthorized> in static SSR layoutContent never shownStatic SSR uses middleware pipeline; redirect via LoginPath or RedirectToLogin component
Global interactivity without AcceptsInteractiveRoutingIdentity pages crashAdd AcceptsInteractiveRouting() check in App.razor (Step 3)
Missing AddCascadingAuthenticationState()Task<AuthenticationState> is nullRegister in Program.cs (Step 2)
z tego samego repozytorium

Więcej Skills

Wszystkie Skills
dotnet
Społeczność

collect-user-input

Build forms, validate data, and react to user input in Blazor. USE FOR adding forms, search boxes, filter panels, inline editing, data-entry UI, file uploads, validation (annotations or custom), handling form submissions, and binding input controls. Covers EditForm, built-in input components, DataAnnotationsValidator, custom validation, SSR form patterns (SupplyParameterFromForm, FormName, AntiforgeryToken, Enhance), and @bind for simple interactive controls. DO NOT USE for project scaffolding (see create-blazor-project) or prerendering issues (see support-prerendering).

instalacje
3
GitHub Stars
5,5 tys.
Aktualizacja
23 wrz
dotnet
Społeczność

dotnet-webapi

Guides creation and modification of ASP.NET Core Web API endpoints with correct HTTP semantics, OpenAPI metadata, and error handling. USE FOR: adding new API endpoints (controllers or minimal APIs), wiring up OpenAPI/Swagger, creating .http test files, setting up global error handling middleware. DO NOT USE FOR: general C coding style, EF Core data access or query optimization (use optimizing-ef-core-queries), frontend/Blazor work, gRPC services, or SignalR hubs.

instalacje
3
GitHub Stars
5,5 tys.
Aktualizacja
23 wrz
dotnet
Społeczność

test-anti-patterns

Audit a test file or suite; produce a severity-ranked diagnostic report. ALWAYS USE for tests that verify nothing, missing/tautological assertions, swallowed/broad exceptions, flaky/order-dependent tests, duplication, or magic values. Polyglot. DO NOT USE for direct edits: writing-mstest-tests owns supplied MSTest assertions/attributes/lifecycle; code-testing-agent owns new tests. Exclude running tests, migration, assertion metrics (assertion-quality), raw .NET coverage collection (run-tests), non-.NET coverage collection/analysis (native tooling), project-wide .NET coverage/CRAP (coverage-analysis), named-target .NET CRAP (crap-score), behavioral/pseudo-mutation gaps (test-gap-analysis), test-mix/ happy-vs-error classification and trait distributions (test-tagging), or the testsmells.org catalog (test-smell-detection).

instalacje
4
GitHub Stars
5,5 tys.
Aktualizacja
23 wrz
dotnet
Społeczność

binlog-failure-analysis

Analyze MSBuild binary logs to diagnose build failures. USE FOR: build errors that are unclear from console output, diagnosing cascading failures across multi-project builds, tracing MSBuild target execution order, and generally any MSBuild build issues. Requires an existing .binlog file. DO NOT USE FOR: generating binlogs (use binlog-generation), non-MSBuild build systems.

instalacje
1
GitHub Stars
5,5 tys.
Aktualizacja
22 wrz