private static async Task UpdateSubjectRefreshTokensList(string token, RefreshTokenDescription desc, IRedisConnection c)
        {
            var skKey = SubjectRefreshTokensRedisKey.Create(desc.LoginRequest.Subject);
            var sk    = new RedisKey <SubjectRefreshTokenList>(skKey, c);
            var subjectRefreshTokenList = await sk.GetAsync();

            if (subjectRefreshTokenList != null)
            {
                var expiredRt = subjectRefreshTokenList
                                .Where(t => t.NotAfter < DateTime.Now)
                                .ToArray();
                foreach (var srt in expiredRt)
                {
                    subjectRefreshTokenList.Remove(srt);
                }
            }
            else
            {
                subjectRefreshTokenList = new SubjectRefreshTokenList();
            }

            subjectRefreshTokenList.Add(new SubjectRefreshToken
            {
                RefreshToken = token,
                NotAfter     = desc.NotAfter
            });

            await sk.SetAsync(subjectRefreshTokenList);
        }
        private static async Task SaveToken(string token, RefreshTokenDescription desc, IRedisConnection c)
        {
            var tkKey = RefreshTokenRedisKey.Create(token);
            var tk    = new RedisKey <RefreshTokenDescription>(tkKey, c);
            await tk.SetAsync(desc);

            await tk.SetExpirationAsync(desc.NotAfter - DateTime.Now);
        }
        public async Task Register(string token, RefreshTokenDescription desc)
        {
            if (token == null)
            {
                throw new ArgumentNullException(nameof(token));
            }
            if (desc == null)
            {
                throw new ArgumentNullException(nameof(desc));
            }

            if (desc.NotAfter <= DateTime.Now)
            {
                throw new InvalidOperationException("Token is expired");
            }

            using (var c = await RedisManager.GetConnection())
            {
                await SaveToken(token, desc, c);

                await UpdateSubjectRefreshTokensList(token, desc, c);
            }
        }