public async Task <AccessTokenDto> CreateAccessTokenAsync(User user)
        {
            var jwtToken     = GenerateJwtToken(CreateUserClaims(user));
            var refreshToken = new RefreshToken
            {
                UserId = user.Id,
                Token  = GenerateRefreshToken()
            };

            if (await _refreshTokenRepository.AnyByUserIdAsync(user.Id))
            {
                _refreshTokenRepository.Update(refreshToken);
            }
            else
            {
                _refreshTokenRepository.Create(refreshToken);
            }

            await _saveProvider.SaveAsync();

            return(new AccessTokenDto {
                RefreshToken = refreshToken.Token, Token = jwtToken
            });
        }