function_two.cs

[FunctionName("GetCurrentUserFunction")]
public async Task<IActionResult> Run(
    [HttpTrigger(AuthorizationLevel.Anonymous, "get", Route = "current/user")]HttpRequestMessage eventData,
    ILogger logger,
    [UserToken]UserTokenResult userResult)
{   
    if (userResult.TokenState == TokenState.Valid)
    {
        var user = await _dataProvider.GetUserByUsername(userResult.Username);
        if (user == null)
        {
            return new NotFoundResult();
        }
        return new OkObjectResult(user);
    }
    else if (userResult.TokenState == TokenState.Empty)
    {
        return new BadRequestResult();
    }
    else
    {
        return new UnauthorizedResult();
    }
}