Microsoft.AspNetCore.SignalR.PersistentConnection.VerifyGroups C# (CSharp) Method

        internal IList<string> VerifyGroups(string connectionId, string groupsToken)
        {
            if (String.IsNullOrEmpty(groupsToken))
            {
                return ListHelper<string>.Empty;
            }

            string unprotectedGroupsToken = null;

            try
            {
                unprotectedGroupsToken = ProtectedData.Unprotect(groupsToken, Purposes.Groups);
            }
            catch (Exception ex)
            {
                Logger.LogInformation(String.Format("Failed to process groupsToken {0}: {1}", groupsToken, ex));
            }

            if (String.IsNullOrEmpty(unprotectedGroupsToken))
            {
                return ListHelper<string>.Empty;
            }

            var tokens = unprotectedGroupsToken.Split(SplitChars, 2);

            string groupConnectionId = tokens[0];
            string groupsValue = tokens.Length > 1 ? tokens[1] : String.Empty;

            if (!String.Equals(groupConnectionId, connectionId, StringComparison.OrdinalIgnoreCase))
            {
                return ListHelper<string>.Empty;
            }

            return JsonSerializer.Parse<string[]>(groupsValue);
        }