public User GetUserByLogon(LogonModel model)
 {
     using (var db = new Db())
     {
         return db.Users.FirstOrDefault(u => u.UserName == model.UserName && u.Password == model.UserPass);
     }
     return null;
 }
 public string GetAuthToken(LogonModel model)
 {
     if (ModelState.IsValid)
     {
         var registerUserId = GetUserByLogon(model).Id;
         var token = TokenService.CreateToken(registerUserId);
         return token;
     }
     return null;
 }