ASP.NET Core Identity - get current user

Question

To get the currently logged in user in MVC5, all we had to do was:

using Microsoft.AspNet.Identity;
[Authorize]
public IHttpActionResult DoSomething() {
             


        

Answer 1

Just if any one is interested this worked for me. I have a custom Identity which uses int for a primary key so I overrode the GetUserAsync method

Override GetUserAsync

public override Task GetUserAsync(ClaimsPrincipal principal)
{
    var userId = GetUserId(principal);
    return FindByNameAsync(userId);
}

Get Identity User

var user = await _userManager.GetUserAsync(User);

If you are using a regular Guid primary key you don't need to override GetUserAsync. This is all assuming that you token is configured correctly.

public async Task GenerateTokenAsync(string email)
{
    var user = await _userManager.FindByEmailAsync(email);
    var tokenHandler = new JwtSecurityTokenHandler();
    var key = Encoding.ASCII.GetBytes(_tokenProviderOptions.SecretKey);

    var userRoles = await _userManager.GetRolesAsync(user);
    var roles = userRoles.Select(o => new Claim(ClaimTypes.Role, o));

    var claims = new[]
    {
        new Claim(JwtRegisteredClaimNames.Sub, user.UserName),
        new Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString()),
        new Claim(JwtRegisteredClaimNames.Iat, DateTime.UtcNow.ToString(CultureInfo.CurrentCulture)),
        new Claim(JwtRegisteredClaimNames.GivenName, user.FirstName),
        new Claim(JwtRegisteredClaimNames.FamilyName, user.LastName),
        new Claim(JwtRegisteredClaimNames.Email, user.Email),
    }
    .Union(roles);

    var tokenDescriptor = new SecurityTokenDescriptor
    {
        Subject = new ClaimsIdentity(claims),
        Expires = DateTime.UtcNow.AddHours(_tokenProviderOptions.Expires),
        SigningCredentials = new SigningCredentials(new SymmetricSecurityKey(key), SecurityAlgorithms.HmacSha256Signature)
    };

    var token = tokenHandler.CreateToken(tokenDescriptor);

    return Task.FromResult(new JwtSecurityTokenHandler().WriteToken(token)).Result;
}