Smuxi.Engine.XmppProtocolManager.CommandContact C# (CSharp) Метод

        public void CommandContact(CommandModel cd)
        {
            FrontendManager fm = cd.FrontendManager;
            // todo: allow length of 2 in private chat windows
            if (cd.DataArray.Length < 3) {
                NotEnoughParameters(cd);
                return;
            }
            Jid jid = GetJidFromNickname(cd.DataArray[2]);
            string cmd = cd.DataArray[1];
            // the logic here is taken from
            // http://xmpp.org/rfcs/rfc3921.html#int
            switch (cmd) {
                case "addgroup":
                    if (cd.DataArray.Length < 4) {
                        NotEnoughParameters(cd);
                        return;
                    }
                    JabberClient.RosterManager.AddRosterItem(jid, null, cd.DataArray[3]);
                    break;
                case "addonly":
                    JabberClient.RosterManager.AddRosterItem(jid);
                    break;
                case "add":
                    XmppPersonModel person;
                    if (Contacts.TryGetValue(jid.Bare, out person)) {
                        if (person.Subscription == SubscriptionType.both) break;
                        if (person.Subscription != SubscriptionType.to) {
                            JabberClient.PresenceManager.Subscribe(jid);
                        }
                        if (person.Subscription != SubscriptionType.from) {
                            // in case we already know this contact… but he can't see us
                            JabberClient.PresenceManager.ApproveSubscriptionRequest(jid);
                        }
                    } else {
                        JabberClient.RosterManager.AddRosterItem(jid);
                        JabberClient.PresenceManager.Subscribe(jid);
                        JabberClient.PresenceManager.ApproveSubscriptionRequest(jid);
                    }
                    break;
                case "subscribe":
                    JabberClient.PresenceManager.Subscribe(jid);
                    break;
                case "unsubscribe":
                    // stop receiving status updates from this contact
                    // that contact will still receive your updates
                    JabberClient.PresenceManager.Unsubscribe(jid);
                    break;
                case "remove":
                case "rm":
                case "del":
                case "delete":
                    JabberClient.RosterManager.RemoveRosterItem(jid);
                    // unsubscribing is unnecessary, the server is required to do this
                    break;
                case "accept":
                case "allow":
                case "approve":
                case "auth":
                case "authorize":
                    JabberClient.PresenceManager.ApproveSubscriptionRequest(jid);
                    break;
                case "deny":
                case "refuse":
                    // stop the contact from receiving your updates
                    // you will still receive the contact's status updates
                    JabberClient.PresenceManager.RefuseSubscriptionRequest(jid);
                    break;
                case "rename":
                    if (cd.DataArray.Length < 4) {
                        JabberClient.RosterManager.UpdateRosterItem(jid, "");
                    } else {
                        var newNick = String.Join(" ", cd.DataArray.Skip(3).ToArray());
                        JabberClient.RosterManager.UpdateRosterItem(jid, newNick);
                    }
                    break;
                default:
                    var builder = CreateMessageBuilder();
                    builder.AppendText(_("Invalid contact command: {0}"), cmd);
                    Session.AddMessageToFrontend(cd, builder.ToMessage());
                    return;
            }
        }