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How to Use the Weixin Authentication for MVC / Razor Page Applications

This guide demonstrates how to integrate Weixin to an ABP application that enables users to sign in using OAuth 2.0 with credentials.

Create a sandbox account

If you don't have a production account, you can create a sendbox account for testing: https://mp.weixin.qq.com/debug/cgi-bin/sandboxinfo?action=showinfo&t=sandbox/index

In this article we will use the sandbox account.

You should configure the callback domain name on the Weixin open platform

AddWeixin

You need to install AspNet.Security.OAuth.Weixin package to your .Web project.

In your .Web project, locate your ApplicationWebModule and modify ConfigureAuthentication method with the following:

private void ConfigureAuthentication(ServiceConfigurationContext context)
{
    var configuration = context.Services.GetConfiguration();
    context.Services.ForwardIdentityAuthenticationForBearer(OpenIddictValidationAspNetCoreDefaults.AuthenticationScheme);
    context.Services.AddAuthentication()
        .AddWeixin(options =>
        {
            options.ClientId = configuration["Weixin:ClientId"];
            options.ClientSecret = configuration["Weixin:ClientSecret"];
        });
}

Updating appsettings.json to add Weixin section:

  "Weixin": {
    "ClientId": "<your-app-id>",
    "ClientSecret": "<your-app-secret>"
  }

Web page authorization

Now you can run the application to login with Weixin.

It will redirect to weixin platform to scan the QR code.

The sandbox account lacks the necessary scope, so it may not work properly.

Official account authorization

Updating AddWeixin:

context.Services.AddAuthentication()
    .AddWeixin(options =>
    {
        options.ClientId = configuration["Weixin:ClientId"];
        options.ClientSecret = configuration["Weixin:ClientSecret"];
        options.AuthorizationEndpoint = "https://open.weixin.qq.com/connect/oauth2/authorize";
    });

Now you can use WeChat app to open the web application URL to login with weixin.

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