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Logto team
Logto team
The better identity infrastructure for developers
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Every app needs authentication and authorization. Logto is an Auth0 alternative designed for modern apps and SaaS products.

In this article, we will go through the steps to quickly build the Apple sign-in experience (user authentication) with .NET Core (Blazor WebAssembly) and  Logto.

Prerequisites

Create an application in Logto​

In you browser, open a new tab and enter the link of Logto Admin Console.

Get Started

Once the page is loaded, in the "Get Started" section click the View all link to open the application framework list page.

Choose your application type​

Framework List

In the opening modal, scroll to the "Single page app" section or filter all the available " Single page app" frameworks using the quick filter checkboxes on the left.

Click the ".NET Core (Blazor WebAssembly)" framework card to start creating your application.

Enter application name​

Create Application modal

Enter the application name, e.g., "Bookstore," and click "Create application."

🎉 Ta-da! You just created your first application in Logto. You'll see a congrats page which includes a detailed integration guide. Follow the guide to see what the experience will be in your application.

Integrate Logto SDK​

tip

Installation​

Add the NuGet package to your project:

dotnet add package Blorc.OpenIdConnect

Add script references​

Include Blorc.Core/injector.js the index.html file:

<head>
  <!-- ... -->
  <script src="_content/Blorc.Core/injector.js"></script>
  <!-- ... -->
</head>

Register services​

Add the following code to the Program.cs file:

using Blorc.OpenIdConnect;
using Blorc.Services;

builder.Services.AddBlorcCore();
builder.Services.AddAuthorizationCore();
builder.Services.AddBlorcOpenIdConnect(
    options =>
    {
        builder.Configuration.Bind("IdentityServer", options);
    });

var webAssemblyHost = builder.Build();

await webAssemblyHost
    .ConfigureDocumentAsync(async documentService =>
    {
        await documentService.InjectBlorcCoreJsAsync();
        await documentService.InjectOpenIdConnectAsync();
    });

await webAssemblyHost.RunAsync();
info

There's no need to use the Microsoft.AspNetCore.Components.WebAssembly.Authentication package. The Blorc.OpenIdConnect package will take care of the authentication process.

Configure application​

Add the following code to the appsettings.json file:

{
  // ...
  IdentityServer: {
    Authority: 'https://<your-logto-endpoint>/oidc',
    ClientId: '<your-logto-app-id>',
    PostLogoutRedirectUri: '<your-app-url>',
    RedirectUri: '<your-app-url>',
    ResponseType: 'code',
    Scope: 'openid profile', // Add more scopes if needed
  },
}

Remember to add the RedirectUri and PostLogoutRedirectUri to the list of allowed redirect URIs in the Logto application settings. They are both the URL of your WASM application.

Update Razor pages​

Add AuthorizeView component​

In the Razor pages that require authentication, add the AuthorizeView component. Let's assume it's the Home.razor page:

@using Microsoft.AspNetCore.Components.Authorization
@page "/"

<AuthorizeView>
    <Authorized>
        @* Signed in view *@
        <button @onclick="OnLogoutButtonClickAsync">
            Sign out
        </button>
    </Authorized>
    <NotAuthorized>
        @* Unauthenticated view *@
        <button @onclick="OnLoginButtonClickAsync">
            Sign in
        </button>
    </NotAuthorized>
</AuthorizeView>

Set up authentication​

In the Home.razor.cs file (create it if it doesn't exist), add the following code:

using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Components;
using Microsoft.AspNetCore.Components.Web;
using Blorc.OpenIdConnect;
using Microsoft.AspNetCore.Components.Authorization;

[Authorize]
public partial class Home : ComponentBase
{
    [Inject]
    public required IUserManager UserManager { get; set; }

    public User<Profile>? User { get; set; }

    [CascadingParameter]
    protected Task<AuthenticationState>? AuthenticationStateTask { get; set; }

    protected override async Task OnInitializedAsync()
    {
        User = await UserManager.GetUserAsync<User<Profile>>(AuthenticationStateTask!);
    }

    private async Task OnLoginButtonClickAsync(MouseEventArgs obj)
    {
        await UserManager.SignInRedirectAsync();
    }

    private async Task OnLogoutButtonClickAsync(MouseEventArgs obj)
    {
        await UserManager.SignOutRedirectAsync();
    }
}

Once the user is authenticated, the User property will be populated with the user information.

Display user information​

Here are some examples of how to display user information in the Home.razor page:

<AuthorizeView>
    <Authorized>
        @* Signed in view *@
        @* ... *@
        <p>You are signed in as @(@User?.Profile?.Name ?? "(unknown name)").</p>
    </Authorized>
    @* ... *@
</AuthorizeView>

For more properties and claims, check the User and Profile classes in the Blorc.OpenIdConnect package.

Test your integration

Open your .NET Core (Blazor Server) app to test if the integration works. When you click the "Sign In" button, the page should be redirected to a Logto sign-in page, and you should be able to create a new account by entering username and password and complete the sign-in process.

Add Apple connector​

To add a social connector, go to the "Connector" tab in the Admin Console, then click on "Social connectors". From there, click "Add social connector".

Connector tab

In the openning modal, select "Apple" and click "Next".

On the next page, you will see a two-column layout with the README content on the left and configuration on the right.

Feel free to follow the README file in place or read the following section to complete the configuration process. If you follow the in-place guide, you can skip the next section.

Set up Apple Sign-in​

ℹ️ Note

Apple sign-in is required for AppStore if you have other social sign-in methods in your app. Having Apple sign-in on Android devices is great if you also provide an Android app.

You need to enroll Apple Developer Program before continuing.

Enable Sign in with Apple for your app​

⚠️ Caution

Even if you want to implement Sign in with Apple on a web app only, you still need to have an existing app that embraces the AppStore ecosystem (i.e., have a valid App ID).

You can do it via Xcode -> Project settings -> Signing & Capabilities, or visit Certificates, Identifiers & Profiles.

Enable Sign in with Apple

See the "Enable an App ID" section in Apple official docs for more info.

Create an identifier​

  1. Visit Certificates, Identifiers & Profiles, then click the "+" button next to "Identifier".
  2. In the "Register a new identifier" page, choose "Services IDs" and click "Continue".
  3. Fill out "Description" and "Identifier" (E.g., Logto Test and io.logto.test), then click "Continue".
  4. Double-check the info and click "Register".

Enable Sign in with Apple for your identifier​

Click the identifier you just created. Check "Sign in with Apple" on the details page and click "Configure".

Enable Sign in with Apple

In the opening modal, select the App ID you just enabled Sign in with Apple.

Enter the domain of your Logto instance without protocol and port, e.g., your.logto.domain; then enter the "Return URL" (i.e., Redirect URI), which is the Logto URL with /callback/${connector_id}, e.g., https://your.logto.domain/callback/apple-universal. You can get the randomly generated connector_id after creating Apple connector in Admin Console.

domain-and-url

Click "Next" then "Done" to close the modal. Click "Continue" on the top-right corner, then click "Save" to save your configuration.

⚠️ Caution

Apple does NOT allow Return URLs with HTTP protocol and localhost domain.

If you want to test locally, you need to edit /etc/hosts file to map localhost to a custom domain and set up a local HTTPS environment. mkcert can help you for setting up local HTTPS.

Compose the connector JSON​

You need to use the identifier that fills in the Create an identifier section to compose the JSON:

{
  "clientId": "io.logto.test"
}

ℹ️ Note

This connector doesn't support customizing scope (e.g., name, email) yet since Apple requires form_post response mode when scope is not empty, which is incompatible with the current connector design.

We'll figure out this later.

Save your configuration​

Double check you have filled out necessary values in the Logto connector configuration area. Click "Save and Done" (or "Save changes") and the Apple connector should be available now.

Enable Apple connector in Sign-in Experience​

Switch to the "Sign-in experience" tab, then click the "Sign-up and sign-in" tab.

note

If it's the first time you enter the tab, you will see a quick introduction about Sign-in Experience and its basic configuration.

Sign-in Experience tab

Select "None" for the "Sign-up identifier" to provide minimum sign-up effort for Apple sign-in, which may increase your conversion rate.

In the "Social sign-in" section, add "Add Social Connector" and choose "Apple". Then you should be able to see a button with text "Continue with Apple" in the preview section.

Save changes

Finally, click "Save changes" on the bottom right corner.

Testing and Validation​

Return to your .NET Core (Blazor WebAssembly) app. You should now be able to sign in with Apple. Enjoy!

Further readings​

⚔️ Protect your API For native and single page apps, you'll need to call one or more API endpoints to retrieve and update data.
Learn more about identifying who's who and keeping your API secure.

🧑‍🚀 Manage users We know you care about user management and activities, as we also do.
Learn more about how to know your users and see the figures like DAU and MAU graphically.

🌐 Localization From one regional business to a global corporate, the willingness to offer the best user experience won't change.
You can change current language phrases or add a new language without friction.

🧑‍🎓 Customer IAM series Our serial blog posts about Customer (or Consumer) Identity and Access Management, from 101 to advanced topics and beyond.