public async Task <ActionResult <LoginResponse> > Login([FromBody] Admin tmpAdmin)
        {
            if (!ModelState.IsValid)
            {
                return(BadRequest(new MBadRequest(ModelState)));
            }

            var admin = await _adminRepo.GetByUsername(tmpAdmin.Username);

            if (admin == null || !admin.VerifyPassword(tmpAdmin.Password))
            {
                return(Unauthorized(new MAuthenticationFailed()));
            }

            var auth = await _authRepo.GetByUsername(tmpAdmin.Username);

            if (auth == null)
            {
                // generate new authentication
                auth = new Authentication
                {
                    Username = tmpAdmin.Username,
                    UserType = UserType.Admin
                };

                auth.GenerateNewCode();
                auth.SetExpiresFromNow(_options.CurrentValue.AdminAuthExpireHours);
                await _authRepo.AddAuthentication(auth);
            }
            else if (auth.IsExpired())
            {
                auth.GenerateNewCode();
                auth.SetExpiresFromNow(_options.CurrentValue.AdminAuthExpireHours);
                await _authRepo.UpdateAuthentication(auth);
            }

            return(Ok(new LoginResponse(auth.Code)));
        }