How to receive the current user with create react app -auth template on net core 3 and identity server - authorization

Question

I have never used identity server before and I was wondering how to receive the current user info if they have been authenticated using net core 3.
Using the barebones create react app -auth weather app template
in the WeatherForecastController we have the authorize attribute:
[Authorize]
[ApiController]
[Route("[controller]")]
public class WeatherForecastController : ControllerBase
With the following endpoint:
[HttpGet]
public IEnumerable<WeatherForecast> Get()
Which will return the correct data if you have logged in and been granted a jwt bearer token.
I would like to create an endpoint that:
1. Allows anonymous access(logged in or not so the authorize attribute needs ditching or overriding)
2. It should then try to authenticate the user
3.If the user can be identified then the endpoint will return the correct data else if the user cannot be identified it will return a subset of the data
I'm struggling to retrieve the user who has made the request information, I believe i'm supposed to use GET /connect/userinfo identityserver endpoint with the bearer token as a parameter but I have no idea how to do this. I would like to access the user_id so I can corrispond with the identityUser table.
I have also tried:
var identity = (ClaimsIdentity)User.Identity;
IEnumerable<Claim> claims = identity.Claims;
It just feels like theres a proper way to do this stuff that i'm missing. I'd be grateful for someone to point me in the right direction.

Answer 1

It should then try to authenticate the user
Browsers communicate with web applications. You should have a web application to be able to redirect back to IDS4 to login. What you are have is an API. Later Web applications communicate with web APIs. Read more here
If the user can be identified then the endpoint will return the correct data else if the user cannot be identified it will return a subset of the data
What you are looking for is Authorization, you can manually do this check on the endpoint. You can access current user using ControllerBase.User ass a result of passing a valid JWT tokens to the API. Considering you already setup authentication using code like bellow:
services.AddAuthentication("Bearer").AddJwtBearer("Bearer",
options =>
{
options.Authority = "http://localhost:5000";
options.Audience = "api1";
options.RequireHttpsMetadata = false;
options.TokenValidationParameters = new TokenValidationParameters()
{
NameClaimType = "http://schemas.xmlsoap.org/ws/2005/05/identity/claims/nameidentifier"//To set Identity.Name
};
});
I'm struggling to retrieve the user who has made the request information
You can simply use ControllerBase.User to get the current authenticated user on API, no need to call any endpoint.
Update: Setting NameClaimType as posted on code above will set Identity.Name to the user's identifier.