What is the way in ASP.NET Core 3.0 to get current authenticated User username?

Question

I'm working on the latest ASP.NET Core 3.0 Angular template. What I need to know is how we can get authenticated user, username in ActionFilterAttribute.

The ClaimTypes.NameIdentifier returns the current user id, and ClaimTypes.Name returns the username which is null.

Here is my code:

where getUser has a UserId of d15f997a-6f65-4eb2-aecb-8b525361ae50

I've also register IHttpContextAccessor in the Startup class as follows:

public IServiceProvider ConfigureServices(IServiceCollection services)
{
        services.AddDbContext<ApplicationDbContext>(options =>
            options.UseSqlServer(
                Configuration.GetConnectionString("DefaultConnection")));

        services.AddDefaultIdentity<ApplicationUser>()
            .AddEntityFrameworkStores<ApplicationDbContext>();

        services.AddIdentityServer()
            .AddApiAuthorization<ApplicationUser, ApplicationDbContext>();

        services.AddAuthentication()
            .AddIdentityServerJwt();

        //Database Setup
        services.AddDbContext<HashooDBContext>(Configuration.GetConnectionString("DefaultConnection"));

        services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

        services.AddControllersWithViews();
        services.AddRazorPages();
        // In production, the Angular files will be served from this directory
        services.AddSpaStaticFiles(configuration =>
        {
            configuration.RootPath = "ClientApp/dist";
        });

        return ContainerSetup.InitializeWeb(Assembly.GetExecutingAssembly(), services);
}

Controller.cs:

[Authorize]
[ApiController]
[Route("api/[controller]/{companycode}")]
public class DashboardTransactionsController : ControllerBase
{
    [CustomAuthorizationFilter("companycode")]
    public string Get()
    {
        return "Welcome";
    }
}

Please let me know what am I doing wrong?

Answer 1

You can use IHttpContextAccessor

private readonly IHttpContextAccessor _httpContextAccessor;

public UserService(
    IHttpContextAccessor httpContextAccessor)
{
  _httpContextAccessor = httpContextAccessor;       
}

And to get user name you can use

_httpContextAccessor?.HttpContext?.User?.Identity?.Name;

Or

 _httpContextAccessor.HttpContext.User.FindFirstValue(ClaimTypes.NameIdentifier);

Then register in your Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();
}