Web API controller: How to get the signed in user

Question

Hello,

 

I'm trying to figure out how to get the current Identity user information, basically i do the following:

 

[Produces("application/json")]
  [Route("api/GetPermissions")]
  public class GetPermissionsController : Controller
  {

  private readonly ClaimsPrincipal _caller;
  //private readonly UserManager _userManager;
  //private readonly SignInManager _signInManager;
  //private readonly UserManager _manager;
  public GetPermissionsController(ClaimsPrincipal caller)
  {
    _caller = caller;
  }

  [HttpGet]
  public IActionResult getPermissions()
  {
   var x= HttpContext.Request.LogonUserIdentity.Name;
    return new JsonResult(_caller.Claims.Select(
            c => new { c.Type, c.Value }));
  }

when i tried to hit the api using POSTMAN, it returned with 500 interval server error. 

 

In my scenario i want to get the username to Angular service.