How to build WeChat (Native) sign-in with .NET Core (Blazor WebAssembly)

For our new friends:

Logto is an Auth0 alternative designed for modern apps and SaaS products. It offers both Cloud and Open-source services to help you quickly launch your identity and management (IAM) system. Enjoy authentication, authorization, and multi-tenant management all in one.

We recommend starting with a free development tenant on Logto Cloud. This allows you to explore all the features easily.

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

Prerequisites

A running Logto instance. Check out the introduction page to get started.
Basic knowledge of .NET Core (Blazor WebAssembly).
A usable WeChat (Native) account.

Create an application in Logto

Logto is based on OpenID Connect (OIDC) authentication and OAuth 2.0 authorization. It supports federated identity management across multiple applications, commonly called Single Sign-On (SSO).

To create your Single page app application, simply follow these steps:

Open the Logto Console. In the "Get started" section, click the "View all" link to open the application frameworks list. Alternatively, you can navigate to Logto Console > Applications, and click the "Create application" button.
In the opening modal, click 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 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 .NET Core (Blazor WebAssembly) with Logto

tip:

The following demonstration is built on .NET Core 8.0 and Blorc.OpenIdConnect.
The .NET Core sample projects are available in the GitHub repository.

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:

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

Register services

Add the following code to the Program.cs file:

Program.cs
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 redirect URIs

Before we dive into the details, here's a quick overview of the end-user experience. The sign-in process can be simplified as follows:

Your app invokes the sign-in method.
The user is redirected to the Logto sign-in page. For native apps, the system browser is opened.
The user signs in and is redirected back to your app (configured as the redirect URI).

This authentication process follows the OpenID Connect (OIDC) protocol, and Logto enforces strict security measures to protect user sign-in.
If you have multiple apps, you can use the same identity provider (Logto). Once the user signs in to one app, Logto will automatically complete the sign-in process when the user accesses another app.

To learn more about the rationale and benefits of redirect-based sign-in, see Logto sign-in experience explained.

note:

In the following code snippets, we assume your app is running on http://localhost:3000/.

Configure redirect URIs

Switch to the application details page of Logto Console. Add a redirect URI http://localhost:3000/callback.

Just like signing in, users should be redirected to Logto for signing out of the shared session. Once finished, it would be great to redirect the user back to your website. For example, add http://localhost:3000/ as the post sign-out redirect URI section.

Then click "Save" to save the changes.

Configure application

Add the following code to the appsettings.json file:

appsettings.json
{
// ...
IdentityServer: {
  Authority: 'https://<your-logto-endpoint>/oidc',
  ClientId: '<your-logto-app-id>',
  PostLogoutRedirectUri: 'http://localhost:3000/',
  RedirectUri: 'http://localhost:3000/callback',
  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.

Add `AuthorizeView` component

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

Pages/Home.razor
@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:

Pages/Home.razor.cs
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.

Checkpoint: Test your application

Now, you can test your application:

Run your application, you will see the sign-in button.
Click the sign-in button, the SDK will init the sign-in process and redirect you to the Logto sign-in page.
After you signed in, you will be redirected back to your application and see the sign-out button.
Click the sign-out button to clear token storage and sign out.

Add WeChat (Native) connector

To enable quick sign-in and improve user conversion, connect with .NET Core (Blazor WebAssembly) as an identity provider. The Logto social connector helps you establish this connection in minutes by allowing several parameter inputs.

To add a social connector, simply follow these steps:

Navigate to Console > Connectors > Social Connectors.
Click "Add social connector" and select "WeChat (Native)".
Follow the README guide and complete required fields and customize settings.

note:

If you are following the in-place Connector guide, you can skip the next section.

Set up WeChat mobile app

Create a mobile app in the WeChat Open Platform

tip:

You can skip some sections if you have already finished.

Create an account

Open https://open.weixin.qq.com/, click the "Sign Up" button in the upper-right corner, then finish the sign-up process.

Create a mobile app

Sign in with the account you just created. In the "Mobile Application" (移动应用) tab, click the big green button "Create a mobile app" (创建移动应用).

Let's fill out the required info in the application form.

Basic info

Most of them are pretty straightforward, and we have several tips here:

If you just want to test WeChat sign-in and the app is not on the App Store, in the "App is available" section, choose "No" to skip the "App download link".
The "App operation flow chart" looks tricky. From our experience, you need to prepare a simple flowchart and several app screenshots to improve the possibility of passing the review.

Click "Next step" to move on.

Platform info

You can configure one or both iOS and Android platforms to integrate Logto with WeChat native sign-in.

iOS app

Check "iOS app" (iOS 应用), then check the target device type of your app accordingly.

If you chose "No" for the App Store availability, you cloud skip filling out the "AppStore download address" here.

Fill out Bundle ID, Test version Bundle ID, and Universal Links (actually, only one link is needed 😂).

note:

Bundle ID and Test version Bundle ID can be the same value.

tip:

WeChat requires universal link for native sign-in. If you haven't set up or don't know it, please refer to the Apple official doc.

Android app

Check "Android app" (Android 应用).

Fill out Application Signing Signature (应用签名) and Application Package Name (应用包名).

note:

You need to sign your app to get a signature. Refer to the Sign your app for more info.

After finish signing, you can execute the signingReport task to get the signing signature.

./gradlew your-android-project:signingReport

The MD5 value of the corresponding build variant's report will be the Application Signing Signature (应用签名), but remember to remove all semicolons from the value and lowercase it.

E.g. 1A:2B:3C:4D -> 1a2b3c4d.

Waiting for the review result

After completing the platform info, click "Submit Review" to continue. Usually, the review goes fast, which will end within 1-2 days.

We suspect the reviewer is allocated randomly on each submission since the standard is floating. You may get rejected the first time, but don't give up! State your status quo and ask the reviewer how to modify it.

iOS

We assume you have integrated Logto iOS SDK in your app. In this case, things are pretty simple, and you don't even need to read the WeChat SDK doc:

1. Configure universal link and URL scheme in your Xcode project

In the Xcode project -> Signing & Capabilities tab, add the "Associated Domains" capability and the universal link you configured before.

Then goes to the "Info" tab, add a custom URL scheme with the WeChat App ID.

Finally open your Info.plist, add weixinULAPI and weixin under LSApplicationQueriesSchemes.

note:

We know these actions are not very reasonable, but this is the minimum workable solution we found. See the magical official guide for more info.

2. Add LogtoSocialPluginWechat to your Xcode project

Add the framework:

And add -ObjC to your Build Settings > Linking > Other Linker Flags:

note:

The plugin includes WeChat Open SDK 1.9.2. You can directly use import WechatOpenSDK once imported the plugin.

3. Add the plugin to your LogtoClient init options

let logtoClient = LogtoClient(
  useConfig: config,
  socialPlugins: [LogtoSocialPluginWechat()]
)

4. Handle onOpenURL properly

note:

The function LogtoClient.handle(url:) will handle all the native connectors you enabled. You only need to call it once.

// SwiftUI
YourRootView()
  .onOpenURL { url in
      LogtoClient.handle(url: url)
  }

// or AppDelegate
func application(_ app: UIApplication, open url: URL, options: /*...*/) -> Bool {
  LogtoClient.handle(url: url)
}

Android

We assume you have integrated Logto Android SDK in your app. In this case, things are pretty simple, and you don't even need to read the WeChat SDK doc:

1. Add Wechat Open SDK to your project

Ensure the mavenCentral() repository is in your Gradle project repositories:

repositories {
  // ...
  mavenCentral()
}

Add the Wechat Open SDK to your dependencies:

dependencies {
  // ...
  api("com.tencent.mm.opensdk:wechat-sdk-android:6.8.0")  // kotlin-script
  // or
  api 'com.tencent.mm.opensdk:wechat-sdk-android:6.8.0'   // groovy-script
}

2. Introduce WXEntryActivity to your project

Create a wxapi package under your package root and add the WXEntryActivity in the wxapi package (Take com.sample.app as an example):

// WXEntryActivity.kt
package com.sample.app.wxapi

import io.logto.sdk.android.auth.social.wechat.WechatSocialResultActivity

class WXEntryActivity: WechatSocialResultActivity()

// WXEntryActivity.java
package com.sample.app.wxapi

import io.logto.sdk.android.auth.social.wechat.WechatSocialResultActivity

public class WXEntryActivity extends WechatSocialResultActivity {}

The final position of the WXEntryActivity under the project should look like this (Take Kotlin as an example):

src/main/kotlin/com/sample/app/wxapi/WXEntryActivity.kt

3. Modify the AndroidManifest.xml

Add the following line to your AndroidManifest.xml:

\<?xml version="1.0" encoding="utf-8"?>
\<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.sample.app">

  \<application>
    \<!-- line to be added -->
    \<activity android:name=".wxapi.WXEntryActivity" android:exported="true"/>
  \</application>

\</manifest>

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 WeChat (Native) connector should be available now.

Once you create a social connector successfully, you can enable it as a "Continue with WeChat (Native)" button in Sign-in Experience.

Navigate to Console > Sign-in experience > Sign-up and sign-in.
(Optional) Choose "Not applicable" for sign-up identifier if you need social login only.
Add configured WeChat (Native) connector to the "Social sign-in" section.

Testing and Validation

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

Create an application in Logto​

Integrate .NET Core (Blazor WebAssembly) with Logto​

Installation​

Add script references​

Register services​

Configure redirect URIs​

Regarding redirect-based sign-in​

Configure redirect URIs​

Configure application​

Add AuthorizeView component​

Set up authentication​

Checkpoint: Test your application​

Add WeChat (Native) connector​

Set up WeChat mobile app​

Create a mobile app in the WeChat Open Platform​

Create an account​

Create a mobile app​

Basic info​

Platform info​

Waiting for the review result​

Enable WeChat native sign-in in your app​

iOS​

Android​

Save your configuration​

Enable WeChat (Native) connector in Sign-in Experience​

Testing and Validation​

Further readings​

Create an application in Logto

Integrate .NET Core (Blazor WebAssembly) with Logto

Installation

Add script references

Register services

Configure redirect URIs

Regarding redirect-based sign-in

Configure redirect URIs

Configure application

Add `AuthorizeView` component

Set up authentication

Checkpoint: Test your application

Add WeChat (Native) connector

Set up WeChat mobile app

Create a mobile app in the WeChat Open Platform

Create an account

Create a mobile app

Basic info

Platform info

Waiting for the review result

Enable WeChat native sign-in in your app

iOS

Android

Save your configuration

Enable WeChat (Native) connector in Sign-in Experience

Testing and Validation

Further readings