How to design an external login feature in .NET?

Question

Gaurika C · Accepted Answer

Designing an external login feature in .NET involves some key steps like first, you need to choose the external provider that you want to use for authentication. Next, you'll need to configure the provider in your application's settings and obtain the necessary credentials to authenticate with the provider's API. This can be done through various packages. One such package is Microsoft.Asp.NetCore.Authentication NuGet package. Once you have configured the external provider, you can then add the external login feature to your .NET application. This involves creating a button for login that directs users to the external provider's login page. After users authenticate with the provider, they will be redirected back to your application and their credentials will be stored securely. To ensure that the external login feature is secure, it's important to implement proper authentication and authorisation mechanisms. This includes verifying the user's identity with the external provider and ensuring that they have the necessary permissions to access your application's resources. With the involvement of a middleware, the login can be designed.

Aryan Kumar · Answer

To design an external login feature in .NET, you will need to:
Register your application with the external login provider. This will give you a client ID and client secret that you will need to use to authenticate users with the provider.Configure your application to use the external login provider. This involves adding the client ID and client secret to your application's configuration file.Create a login button or link that users can click to sign in with the external login provider.Handle the login event. This event will be raised when a user successfully logs in with the external login provider.
Here are some additional details about each step:
To register your application with an external login provider, you will need to visit the provider's website and create an application. Once you have created an application, you will be given a client ID and client secret.To configure your application to use an external login provider, you will need to add the client ID and client secret to your application's configuration file. The configuration file is typically located in the appsettings.json file.To create a login button or link that users can click to sign in with the external login provider, you can use the following code:
Code snippet
andlt;a href="/Account/ExternalLogin">Sign in with external providerandlt;/a>
To handle the login event, you will need to subscribe to the ExternalLogin event in your application's Startup class. The following code shows how to do this:
Code snippet
protected void ConfigureServices(IServiceCollection services)
{
    services.AddAuthentication(options =>
    {
        options.DefaultScheme = "External";
        options.DefaultSignInScheme = "External";
    });
    services.AddMvc();
}
protected void Configure(IApplicationBuilder app, IHostingEnvironment env)
{
    app.UseAuthentication();
    app.UseMvc();
    app.Run(async (context) =>
    {
        await context.SignInAsync("External");
        // Redirect the user to the home page.
        context.RedirectToAction("Index");
    });
}
Once you have completed these steps, your application will be able to allow users to sign in with external login providers.

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How to design an external login feature in .NET?

Ravi Vishwakarma

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