User.Identity.Name is empty in Asp.NET Core 2.0 API Controller

Question

I am new to ASP.NET core itself. However, I am creating WebAPIs in ASP.NET Core 2.0. I have configured JWT Bearer Token based authentication. Below is my Controller which return token.

    [AllowAnonymous]
[Route("api/[controller]")]
public class TokenController : Controller
{
    private readonly UserManager<UserEntity> userManager;
    private readonly SignInManager<UserEntity> signInManager;

    public TokenController(UserManager<UserEntity> userManager, SignInManager<UserEntity> signInManager)
    {
        this.userManager = userManager;
        this.signInManager = signInManager;
    }

    // GET: api/values
    [HttpGet]
    public async Task<IActionResult> Get(string username, string password, string grant_type)
    {
        {
            var user = await userManager.FindByEmailAsync(username);

            if (user != null)
            {
                var result =await signInManager.CheckPasswordSignInAsync(user, password, false);
                if (result.Succeeded)
                {

                    var claims = new[]
                    {
                        new Claim( JwtRegisteredClaimNames.Sub, username),
                        new Claim( JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
                        new Claim( JwtRegisteredClaimNames.GivenName, "SomeUserID")
                    };

                    var key = new SymmetricSecurityKey(Encoding.UTF8.GetBytes("secretesecretesecretesecretesecretesecrete"));
                    var creds = new SigningCredentials(key, SecurityAlgorithms.HmacSha256);

                    var token = new JwtSecurityToken( issuer: "test",
                                                     audience: "test",
                                                     claims: claims,
                                                      expires: DateTime.Now.AddDays(15),
                                                      signingCredentials: creds);

                    return Ok(new { access_token = new JwtSecurityTokenHandler().WriteToken(token), expires_on=DateTime.Now.AddDays(15) });

                }
            }
        }

        return BadRequest("Could not create token");
    }


}

But when calling ValuesController API which is decorated with [Authorize] attributes. I am getting User.Identity.Name is empty. I am not getting any information about user. I am not sure, My token controller is correctly written. As long as it is protecting my ValuesController, I assume, it is correct. However, I might be missing something. Please help.

Note: I am developing using Visual Studio 2017 with Mac Community addition

Answer 1

Yes, you need to specify the claim for the unique name which is translated into the user.identity.name:

new Claim(JwtRegisteredClaimNames.UniqueName, user.UserName)