public async Task <IActionResult> RefreshToken([FromBody] RefreshTokenViewModel model)
        {
            string refreshToken = model.RefreshToken;

            if (string.IsNullOrWhiteSpace(refreshToken))
            {
                return(BadRequest("refreshToken is not set."));
            }

            (Token token, User user) = await jwtTokenService.FindUserAndTokenByRefreshTokenAsync(refreshToken);

            if (token == null)
            {
                return(Unauthorized());
            }

            var result = jwtTokenService.CreateJwtTokens(user);
            await jwtTokenService.AddUserTokenAsync(user, result.RefreshTokenSerial, result.AccessToken, jwtTokenService.GetRefreshTokenSerial(refreshToken));

            return(Ok(new { access_token = result.AccessToken, refresh_token = result.RefreshToken }));
        }