ASP.NET Core

Install NuGet packages:

dotnet add package Passwordless

This ASP.NET Core implementation uses .NET 7 and some JavaScript for a simple passwordless.dev implementation. A register function might look something like:

The Startup class is responsible for configuring and setting up various services, middleware, and components that the application will use during its lifetime.

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    private IConfiguration Configuration { get; }

    ...

    // This method gets called by the runtime. Use this method to add services to the container.
    // For more information on how to configure your application, visit https://go.microsoft.com/fwlink/?LinkID=398940
    public void ConfigureServices(IServiceCollection services)
    {
        // add support for routing to controllers
        services.AddControllers();

        // Inject the Passwordless SDK
        services.Configure<PasswordlessOptions>(Configuration.GetRequiredSection("Passwordless"));
        services.AddPasswordlessSdk(options =>
        {
            Configuration.GetRequiredSection("Passwordless").Bind(options);
        });
    }

Newer templates might not have this, in which case you will need to configure this in your Program class instead. In this case you can access Services and Configuration properties on WebApplicationBuilder.

It would then be as simple to inject IPasswordlessClient in the class where you want to use it. Using the SDK for registering a token would then look like:

[HttpGet("/create-token")]
public async Task<IActionResult> GetRegisterToken(string alias)
{
    var userId = Guid.NewGuid().ToString();

    var payload = new RegisterOptions(userId, alias)
    {
        Aliases = new HashSet<string> { alias }
    };

    try
    {
        var token = await _passwordlessClient.CreateRegisterTokenAsync(payload);
        return Ok(token);
    }
    catch (PasswordlessApiException e)
    {
        return new JsonResult(e.Details)
        {
            StatusCode = (int?)e.StatusCode,
        };
    }
}

And logging in:

[HttpGet("/verify-signin")]
public async Task<IActionResult> VerifySignInToken(string token)
{
    try
    {
        var verifiedUser = await _passwordlessClient.VerifyTokenAsync(token);
        return Ok(verifiedUser);
    }
    catch (PasswordlessApiException e)
    {
        return new JsonResult(e.Details)
        {
            StatusCode = (int?)e.StatusCode
        };
    }
}

References

• ASP.NET example on Github.