public async Task <userToken> getUserByToken(string tokenString)
 {
     try
     {
         //tokenString = tokenString.Replace("Bearer ", "").Trim();
         dbRapChieuPhimContext db = new dbRapChieuPhimContext();
         string    taiKhoan       = parseJWTToEmail(tokenString);
         userToken nguoiDung      = db.NguoiDung.Where(n => n.TaiKhoan == taiKhoan).Select(n => new userToken {
             taiKhoan = n.TaiKhoan, email = n.Email, maLoaiNguoiDung = n.MaLoaiNguoiDung, maNhom = n.MaNhom
         }).FirstOrDefault();
         if (nguoiDung != null)
         {
             return(nguoiDung);
         }
         return(null);
     }
     catch (Exception ex)
     {
         return(null);
     }
 }