public void notify(Packet packet) {
Console.WriteLine("in message handler");
String type = packet.Type == null ? "normal" : packet.Type;
Console.WriteLine("Received " + type + " message: " + packet.getChildValue("body"));
Console.WriteLine(" To: " + packet.To);
Console.WriteLine(" From: " + packet.From);
JabberID jid = new JabberID(packet.From);
if (jid.User != null && jid.User.EndsWith(".group")) { // groupchat message
//void ReceiveGroupMessage(String groupJID, String userNick, String message)
String user = jid.User;
String groupJID = user.Substring(0, user.LastIndexOf(".group"));
String userNick = jid.Resource;
//ReceiveGroupMessage(groupJID, userNick, packet.getChildValue("body");
RecieveGroupMessageDelegate rgmd = new RecieveGroupMessageDelegate(model.gui.ReceiveGroupMessage);
model.gui.Invoke(rgmd, new Object[] { groupJID, userNick, packet.getChildValue("body") });
} else { // regular message
RecieveMessageDelegate del = new RecieveMessageDelegate(model.gui.ReceiveMessage);
model.gui.Invoke(del, new Object[] { jid, packet.getChildValue("body") });
//model.gui.ReceiveMessage(jid, packet.getChildValue("body"));
}
}
public Session getSession(JabberID jabberID) {
String jidString = jabberID.ToString();
Session session = null;
try {
session = jidIndex[jidString];
return session;
} catch (Exception ex) {
try {
List<Session> resources = userIndex[jabberID.User];
return resources[0];
} catch (Exception e) {
return null;
}
}
}
public bool isChatPacket(Packet packet) {
JabberID recipient;
if (packet.To == null) {
return false;
}
recipient = new JabberID(packet.To);
//try {
// recipient = new JabberID(packet.To);
//} catch (Exception ex) {
// return false;
//}
String user = recipient.User;
if (user == null) {
return false;
}
return user.EndsWith(".group") && recipient.equalsDomain(JabberServer.server_name);
}
public void setJID(JabberID jid)
{
this.jid = jid;
}
}//update roster
public void informSubscriber()
{
//needs to be checked!
if ((Server.JabberServer.RosterHashtable[this.user] as UserRoster) != null)
{
foreach (object obj in (Server.JabberServer.RosterHashtable[this.user] as UserRoster).subscribers.Keys)
{
Subscriber sub = (Server.JabberServer.RosterHashtable[this.user] as UserRoster).subscribers[obj] as Subscriber;
if (sub.subscription.Equals("from") || sub.subscription.Equals("both"))//inform sender of his subscribers status!
{
JabberID myid = new JabberID(obj.ToString());//other's subscribers id
if (myid.Domain.Equals(Server.JabberServer.server_name))//if from this server
{
//new code!
if (Server.JabberServer.getUserIndex().getUser(myid.User).getSessions().Values==null)
{
// if Server.JabberServer.getUserIndex().getUser(myid.User).getSessions()
//user is offline
Packet presencePacket = new Packet("presence");
presencePacket.From = myid.ToString();
presencePacket.To = new JabberID(this.user + "@" + Server.JabberServer.server_name).ToString();
presencePacket.setAttribute("type", "unavailable");
MessageHandler.deliverPacket(presencePacket);
}// if (Server.JabberServer.getUserIndex().getUser(myid.User).getSessions().Values!=null)
else
{
foreach (Object obj2 in (Server.JabberServer.getUserIndex().getUser(myid.User).getSessions().Values))
{//for each active session
Session sess = obj2 as Session;
Packet presencePacket = new Packet("presence");
presencePacket.From = myid.ToString();
presencePacket.To = new JabberID(this.user + "@" + Server.JabberServer.server_name).ToString();
if (sess.getPresence().isAvailible())
{
presencePacket.setAttribute("type", "available");
if(sess.getPresence().getShow()!=null)
presencePacket.Children.Add(new Packet("show",sess.getPresence().getShow()));
if(sess.getPresence().getStatus()!=null)
presencePacket.Children.Add(new Packet("status",sess.getPresence().getStatus()));
if (sess.getPresence().getPriority() != null)
presencePacket.Children.Add(new Packet("priority", sess.getPresence().getPriority()));
//other info may be added!
}
else
presencePacket.setAttribute("type", "unavailable");
MessageHandler.deliverPacket(presencePacket);
}//for each active session
}
}// if(myid.Domain.Equals(Server.JabberServer.server_name))
else
{
//generate probe for S2S communication!@TODO
}
}//if (sub.subscription.Equals("from") || sub.subscription.Equals("both"))
}//foreach (object obj in (Server.JabberServer.RosterHashtable[this.user] as UserRoster).subscribers.Keys)
}//if ((Server.JabberServer.RosterHashtable[this.user] as UserRoster) != null)
}
}//getPacket
public void updateRoster(Packet packet)
{
//Extract the query packet
Packet rosterQuery = packet.getFirstChild("query");
rosterQuery.setAttribute("xmlns", "jabber:iq:roster");
foreach (object rosterItems in rosterQuery.getChildren())
{
//for each <item> packet in the query
Object child = rosterItems;
if (child is Packet)
{
Packet itemPacket = child as Packet;
String subJID = itemPacket.getAttribute("jid");
//create Subscriber object if needed
//Subscriber sendersSubscriberItem = this.subscribers[subJID] as Subscriber;
if ((Server.JabberServer.RosterHashtable[this.user] as UserRoster) == null)
{
Server.JabberServer.RosterHashtable[this.user] = new UserRoster();
}
Subscriber sub = (Server.JabberServer.RosterHashtable[this.user] as UserRoster).subscribers[subJID] as Subscriber;
if (sub == null)
{
sub = new Subscriber();
sub.subscription = "none";
sub.ask = null;
(Server.JabberServer.RosterHashtable[this.user] as UserRoster).subscribers.Add(subJID, sub);
}
if (itemPacket.getAttribute("subscription") != null)
{
//signal to remove
if (itemPacket.getAttribute("subscription").Equals("remove"))
{
//remove from subscribers item
JabberID otherID = new JabberID(subJID);
(Server.JabberServer.RosterHashtable[this.user] as UserRoster).subscribers.Remove(otherID.ToString());
if ((Server.JabberServer.RosterHashtable[this.user] as UserRoster).items.ContainsKey(subJID))
{
//remove <item> packet
(Server.JabberServer.RosterHashtable[this.user] as UserRoster).items.Remove(subJID);
}
if ((Server.JabberServer.RosterHashtable[otherID.User] as UserRoster) == null)
{
Server.JabberServer.RosterHashtable[otherID.User] = new UserRoster();
}
//set only subscription=none from other item
sub = ((Server.JabberServer.RosterHashtable[otherID.User] as UserRoster).subscribers[this.user + "@" + Server.JabberServer.server_name]) as Subscriber;
if (sub == null)
{
sub = new Subscriber();
}
sub.subscription = "none";
sub.ask = null;
(Server.JabberServer.RosterHashtable[otherID.User] as UserRoster).subscribers[this.user + "@" + Server.JabberServer.server_name] = sub;
//(Server.JabberServer.RosterHashtable[subJID] as UserRoster).subscribers.Add(subJID, sendersSubscriberItem);
//}
if ((Server.JabberServer.RosterHashtable[otherID.User] as UserRoster).items.ContainsKey(this.user + "@" + Server.JabberServer.server_name))
{
//update <item> packet
//itemPacket.removeAttribute("subscription");
Packet mypacket = (Server.JabberServer.RosterHashtable[otherID.User] as UserRoster).items[this.user + "@" + Server.JabberServer.server_name] as Packet;
mypacket.setAttribute("subscription", "none");
mypacket.setAttribute("ask", null);
(Server.JabberServer.RosterHashtable[otherID.User] as UserRoster).items[this.user + "@" + Server.JabberServer.server_name] = mypacket;
}
}
}
else
{
//update <item> with the subscriber info for roster push
itemPacket.setAttribute("subscription", sub.subscription);
itemPacket.setAttribute("ask", sub.ask);
//Packet test = items[subJID];
if (!(Server.JabberServer.RosterHashtable[this.user] as UserRoster).items.ContainsKey(subJID))
{
//store updated <item> packet
(Server.JabberServer.RosterHashtable[this.user] as UserRoster).items.Add(subJID, itemPacket);
}
else
{
(Server.JabberServer.RosterHashtable[this.user] as UserRoster).items[subJID] = itemPacket;
}
}
}
}
//Roster push
packet.Type = "set";
JabberID jidTo = packet.getSession().getJID();
packet.To = jidTo.User + "@" + jidTo.Domain;
packet.removeAttribute("from");
//needs to be verified
MessageHandler.deliverPacket(packet);
}//update roster
public void updatePresence(Packet presence)
{
String type = presence.Type;
Session session = presence.Session;
Presence sessionPresence = session.getPresence();
String recipient = presence.To;
JabberID recipientID;
Boolean isUserSent;//it is not used yet, may be used in S2S comunication
//packet filling begins
if (recipient == null)
{ //directed to server
//server name
recipientID = new JabberID(Server.JabberServer.server_name);
isUserSent = true;
}
else
{
recipientID = new JabberID(recipient);
if (user.Equals(recipientID.User))
{
isUserSent = false;
}
else
{
isUserSent = true;
}
}
String sender = presence.From;
JabberID SenderID;
if (sender == null)
{
SenderID = session.JID;
}
else
{
SenderID = new JabberID(sender);
}
//added by marko
presence.From = SenderID.User + "@" + SenderID.Domain;
//original line:
//String subscriber = isUserSent ? recipientID.ToString() : SenderID.ToString();
String subscriber = recipientID.ToString();
if (type == null)
{
type = "available";
}
//packet filling ends
//packet routing begins
if (type.Equals("available") || type.Equals("unavailable"))
{
//user-managed presence updates are delivered untouched
if (!recipientID.ToString().Equals(Server.JabberServer.server_name))
{
//may need some work;
MessageHandler.deliverPacket(presence);
return;
}
//Server-managed presence updates are forwarded only to subscribers
//update the session's presence status
sessionPresence.Availible = type.Equals("available");
sessionPresence.Show = presence.getChildValue("show");
sessionPresence.Status = presence.getChildValue("status");
String priority = presence.getChildValue("priority");
sessionPresence.Priority = priority;
if (priority != null)
{
//some code to set the priority of the session
try
{
session.setPriority(int.Parse(priority));
}
catch (Exception ex)
{
JabberServer.output.WriteLine("Error in incoming priority, setting priority to default: 1");
session.setPriority(0);
}
}
//deliver to all users presence subscribers
updateSubscribers(presence);
informSubscriber();
return;
}
if (type.Equals("probe"))
{
//needed for server to server communication!!!!
JabberServer.output.WriteLine("Roster: We don't handle probes yet " + presence.ToString());
return;
}
//Marko believes it is checked for exceptions
//Subscriber sendersSubscriberItem = (Subscriber)subscribers[subscriber];
Subscriber sendersSubscriberItem = new Subscriber();
Hashtable Rosters = JabberServer.RosterHashtable;//get reference to rosters
//prepare sender's roster
UserRoster senderRoster = Rosters[this.user] as UserRoster;//getting senders roster
if (senderRoster == null)
{
senderRoster = new UserRoster();
senderRoster.user = this.user;
}
if (!Rosters.ContainsKey(this.user))
{
Rosters.Add(this.user, senderRoster);
}
//prepare recipients roster
UserRoster recipientRoster = Rosters[recipientID.User] as UserRoster;//getting recipients roster
if (recipientRoster == null)
{
recipientRoster = new UserRoster();
recipientRoster.user = recipientID.User;
}
if (!Rosters.ContainsKey(recipientID.User))
{
Rosters.Add(recipientID.User, recipientRoster);
}
sendersSubscriberItem = senderRoster.subscribers[subscriber] as Subscriber;//extra
if (sendersSubscriberItem == null)
{
//create subscription item
sendersSubscriberItem = new Subscriber();
sendersSubscriberItem.subscription = "none";
senderRoster.subscribers.Add(recipient, sendersSubscriberItem);
Packet itempacket = new Packet("item");
itempacket.setAttribute("jid", subscriber);
senderRoster.items.Add(subscriber, itempacket);
}
//begin subscription managment
if (type.Equals("subscribe"))
{
sendersSubscriberItem.ask = type;//set up subscription status
}
else if (type.Equals("subscribed"))//if subscription accepted
{
sendersSubscriberItem.ask = null;
if (sendersSubscriberItem.subscription.Equals("from"))
{
sendersSubscriberItem.subscription = "both";
}
else if (sendersSubscriberItem.subscription.Equals("none"))
{
sendersSubscriberItem.subscription = "to";
}
}
else if (type.Equals("unsubscribed"))
{//sender does not want to give presence updates to recipient
sendersSubscriberItem.ask = null;
if (sendersSubscriberItem.subscription.Equals("to"))
{
sendersSubscriberItem.subscription = "none";
}
else if (sendersSubscriberItem.subscription.Equals("both"))
{
sendersSubscriberItem.subscription = "from";
}
//notify recipient of sender's unavailble status:
Packet unavailiblePacket = new Packet("presence");
unavailiblePacket.setFrom(presence.From);
unavailiblePacket.To = presence.To;
unavailiblePacket.setAttribute("type", "unavailable");
MessageHandler.deliverPacket(unavailiblePacket);
}
else if (type.Equals("unsubscribe"))
{//sender no longer interested in recieving presence updates from recipient
sendersSubscriberItem.ask = null;
if (sendersSubscriberItem.subscription.Equals("both"))
{
sendersSubscriberItem.subscription = "to";
}
else if (sendersSubscriberItem.subscription.Equals("from"))
{
sendersSubscriberItem.subscription = "none";
}
}
//update the corresponding changes in <items> table in sender's record used for delivery
Packet item = (Packet)senderRoster.items[subscriber];
if (item != null)
{
item.setAttribute("subscription", sendersSubscriberItem.subscription);
item.setAttribute("ask", sendersSubscriberItem.ask);
Packet iq = new Packet("iq");
iq.Type = "set";
Packet query = new Packet("query");
query.setAttribute("xmlns", "jabber:iq:roster");
query.setParent(iq);
item.setParent(query);
iq.To = this.user + "@" + Server.JabberServer.server_name;
//Forward the subscription packet to recipient
MessageHandler.deliverPacketToAll(user, iq);//may need some correction!
}
//processing of recipients roster begins
if (sendersSubscriberItem.ask == null)
{
//the recipient user rosters update!
Subscriber recipientsSubscriberItem = recipientRoster.subscribers[user + "@" + JabberServer.server_name] as Subscriber;//extra
if (recipientsSubscriberItem == null)
{
//create subscription item
recipientsSubscriberItem = new Subscriber();
recipientsSubscriberItem.subscription = "none";
recipientRoster.subscribers.Add(user + "@" + JabberServer.server_name, recipientsSubscriberItem);
}
//if type is subscribe, changes in this roster are not needed!!!
if (type.Equals("subscribed"))//if subscription accepted
{
recipientsSubscriberItem.ask = null;
if (recipientsSubscriberItem.subscription.Equals("none"))
{
recipientsSubscriberItem.subscription = "from";
}
else if (recipientsSubscriberItem.subscription.Equals("to"))
{
recipientsSubscriberItem.subscription = "both";
}
}
else if (type.Equals("unsubscribed"))
{//sender no longer interested in giving presence updates to recipient
recipientsSubscriberItem.ask = null;
if (recipientsSubscriberItem.subscription.Equals("both"))
{
recipientsSubscriberItem.subscription = "to";
}
else if (recipientsSubscriberItem.subscription.Equals("from"))
{
recipientsSubscriberItem.subscription = "none";
}
}
else if (type.Equals("unsubscribe"))
{//sender no longer interested in recieving presence updates from recipient
recipientsSubscriberItem.ask = null;
if (recipientsSubscriberItem.subscription.Equals("to"))
{
recipientsSubscriberItem.subscription = "none";
}
else if (recipientsSubscriberItem.subscription.Equals("both"))
{
recipientsSubscriberItem.subscription = "from";
}
//notify sender of unavailble status:
Packet unavailiblePacket = new Packet("presence");
unavailiblePacket.setFrom(presence.To);
unavailiblePacket.To = presence.From;
unavailiblePacket.setAttribute("type", "unavailable");
MessageHandler.deliverPacket(unavailiblePacket);
}
//update the corresponding changes in <items> table in sender's record used for delivery
Packet item2 = (Packet)recipientRoster.items[user + "@" + JabberServer.server_name];
if (item2 != null)
{
item2.setAttribute("subscription", recipientsSubscriberItem.subscription);
item2.setAttribute("ask", recipientsSubscriberItem.ask);
Packet iq = new Packet("iq");
iq.Type = "set";
Packet query = new Packet("query");
query.setAttribute("xmlns", "jabber:iq:roster");
query.setParent(iq);
item2.setParent(query);
iq.To = recipientID.User + "@" + recipientID.Domain;
//Forward the subscription packet to recipient
MessageHandler.deliverPacketToAll(user, iq);//may need some correction!
}
}
MessageHandler.deliverPacket(presence);
}//UpdatePresense
public System.IO.StreamWriter getWriter(JabberID jabberID) {
// String resource = jabberID.Resource;
// User user = getUser(jabberID.User);
return getUser(jabberID.getUser()).getWriter(jabberID.getResource());
}
public void setJID(JabberID jid) {
this.jid = jid;
}
public Boolean equalsDomain(JabberID testJid) {
return equalsDomain(testJid.domain);
}
public void joinGroup(Group group, Packet packet) {
JabberID jid = new JabberID(packet.To);
String sender = packet.From;
group.jid2nick.Add(sender, jid.Resource);
group.nick2jid.Add(jid.Resource, sender);
updatePresence(group, packet);
foreach (KeyValuePair<String, Packet> pair in group.jid2presence) {
Packet p = pair.Value;
if (p.From != jid.ToString()) {
p.To = sender;
MessageHandler.deliverPacket(p);
}
}
serverMessage(group, jid.Resource + " has joined the group");
}
public Boolean equalsDomain(JabberID testJid)
{
return(equalsDomain(testJid.domain));
}
public Boolean equalsUser(JabberID testJid)
{
return(equalsUser(testJid.user));
}
public Boolean equals(JabberID jid)
{
return(equalsUser(jid) && equalsDomain(jid) && equalsResource(jid));
}
public Boolean equalsResource(JabberID testJid)
{
return(equalsResource(testJid.resource));
}
public Boolean equals(JabberID jid) {
return equalsUser(jid) && equalsDomain(jid) && equalsResource(jid);
}
public Boolean equalsResource(JabberID testJid) {
return equalsResource(testJid.resource);
}
public Boolean equalsUser(JabberID testJid) {
return equalsUser(testJid.user);
}
public void handleChatMessage(Packet packet) {
JabberID recipient = new JabberID(packet.To);
Group group = this[recipient.User];
packet.From = group.JabberID + "/" + group.jid2nick[packet.From];
if (recipient.Resource == null) {
deliverToGroup(group, packet);
} else {
packet.To = group.nick2jid[recipient.Resource];
MessageHandler.deliverPacket(packet);
}
}
// Invokes a method to receive message in a conversation window, delegate is used for cross thread calls
public void ReceiveMessage(JabberID from, string body) {
Console.WriteLine("Gui received message from: " + from);
if(!conversations.ContainsKey(from.User + "@" + from.Domain)) { // Check if there is already open conversation window
Contact c;
if(contacts.ContainsKey(from.User + "@" + from.Domain)) // Check if sender is in Contact list
c = contacts[from.User + "@" + from.Domain];
else
c = new Contact(from.User + "@" + from.Domain);
conversations[from.User + "@" + from.Domain] = new ConverstationWindow(c, this); // Open new conversation window
conversations[from.User + "@" + from.Domain].Show(); // Show if new window
} else {
if(!conversations[from.User + "@" + from.Domain].Visible)
conversations[from.User + "@" + from.Domain].Show();
conversations[from.User + "@" + from.Domain].Activate(); // Just activate if already opened
}
conversations[from.User + "@" + from.Domain].ReceiveMessage(body); // Receive message
}
public void handleChatPresence(Packet packet) {
JabberID recipient = new JabberID(packet.To);
if (!isChatPacket(packet)) {
return;
}
Group group = this[recipient.User];
String nick = recipient.Resource;
String jid = packet.From;
if (String.IsNullOrEmpty(nick)) {
sendEmptyNicknameError(packet);
return;
}
if (group.nick2jid.ContainsKey(nick)) {
if (group.nick2jid[nick] == packet.From) {
updatePresence(group, packet);
} else {
sendConflictingNicknameError(packet);
}
} else {
if(group.jid2nick.ContainsKey(jid)) {
sendConflictingUserError(packet);
} else {
joinGroup(group, packet);
}
}
}
public void notify(Packet packet) {
String from = packet["from"];
String type = packet["type"];
if (type == null) {
type = "available";
}
String show = packet.getChildValue("show");
if (show == null) {
show = "chat";
}
String statusMessage = packet.getChildValue("status");
//test whether the presence is a groupchat presence or regular presence
JabberID jid = new JabberID(from);
String user = jid.User;
if (user != null && user.EndsWith(".group")) { // groupchat presence
Packet error = packet.getFirstChild("error"); // possible error packet
if (error != null) { // there was an error
String code = error["code"];
String description = error.getValue();
ShowGroupErrorDelegate sged = new ShowGroupErrorDelegate(model.gui.ShowGroupError);
model.gui.Invoke(sged, new Object[] { code, description });
//delegate : ShowError(String code, String description);
return;
}
// delegate signature : void UpdateGroupPresence(String groupJID, String userNick, Show show, String statusMessage)
UpdateGroupPresenceDelegate ugpd = new UpdateGroupPresenceDelegate(model.gui.UpdateGroupPresence);
Goodware.Jabber.GUI.Show showStatus = Show.chat;
String groupName = user.Substring(0, user.LastIndexOf(".group"));
String userNick = jid.Resource;
if (show.Equals("chat")) {
showStatus = Show.chat;
} else if (show.Equals("away")) {
showStatus = Show.away;
} else if (show.Equals("xa")) {
showStatus = Show.xa;
} else if (show.Equals("dnd")) {
showStatus = Show.dnd;
}
if (type.Equals("available")) {
// UpdateGroupPresence(groupName, userNick, showStatus, statusMessage);
model.gui.Invoke(ugpd, new Object[] { groupName, userNick, showStatus, statusMessage });
// UpdateGroupPresence(groupName, userNick, showStatus, statusMessage);
} else if (type.Equals("unavailable")) {
RemoveGroupMemberDelegate rgmd = new RemoveGroupMemberDelegate(model.gui.RemoveGroupMember);
model.gui.Invoke(rgmd, new Object[] {groupName, userNick});
// RemoveGroupMember(groupName, userNick);
}
} else { // regular presence
GetContactDelegate del = new GetContactDelegate(model.gui.GetContact);
Contact contact = (Contact)model.gui.Invoke(del, new Object[] { from });
UpdateContactPresenceDelegate ucpd = new UpdateContactPresenceDelegate(model.gui.UpdateContactPresence);
//two cases : presence update & presence subscription
if (type.Equals("available") || type.Equals("unavailable")) { // presence update
Status status;
if (type.Equals("unavailable")) {
status = Status.unavailable;
} else if (show.Equals("chat")) {
status = Status.chat;
} else if (show.Equals("away")) {
status = Status.away;
} else if (show.Equals("xa")) {
status = Status.xa;
} else if (show.Equals("dnd")) {
status = Status.dnd;
} else {
status = Status.unavailable; // some default - execution should never come to this case
}
model.gui.Invoke(ucpd, new Object[] { from, status, statusMessage }); //delegate : UpdateContactPresence(from, Status.unavailable, null)
} else { // presence subscription or unsubscription
if (type.Equals("subscribe")) {
if (contact == null) { // this is the first invitation
AcceptInvitationDelegate aid = new AcceptInvitationDelegate(model.gui.AcceptInvitation);
if ((bool)model.gui.Invoke(aid, new Object[] { from })) { //invitation accepted
model.sendPresence(from, "subscribed", null, null, null);
model.sendPresence(from, "subscribe", null, null, null);
} else { //invitation refused
model.sendPresence(from, "unsubscribed", null, null, null);
}
} else { // the contact is already invited
model.sendPresence(from, "subscribed", null, null, null);
//contact.Status = Status.unavailable;
model.gui.Invoke(ucpd, new Object[] { from, Status.unavailable, null }); //delegate : UpdateContactPresence(from, Status.unavailable, null)
model.sendPresence(model.Me.Status, model.Me.StatusMessage);
//model.sendPresence - presence packet with current presence information for the user (type, status, show)
}
} else if (type.Equals("subscribed")) {
Status status = contact.Status;
if (status == Status.inviteSent) { //the second stage in the "three-way handshake"
// do Nothing : immediately after this packet comes a "subscribe" packet and then things are handled
} else if (status == Status.inviteAccepted) { // the third stage in the "three-way handshake"
//contact.Status = Status.unavailable;
model.gui.Invoke(ucpd, new Object[] { from, Status.unavailable, null }); // delegate : UpdateContactPresence(from, Status.unavailable, null)
}
} else if (type.Equals("unsubscribe")) {
// do Nothing : immediately after this packet comes an "unsubscribed" packet and then things are handled
} else if (type.Equals("unsubscribed")) {
RemoveContactDelegate rcd = new RemoveContactDelegate(model.gui.RemoveContact);
model.gui.Invoke(rcd, new Object[] { from });
// delegate : void removeContact(String jid) - actual invocation : removeContact(from)
// removes the contact <jid> from the structures containing the contacts
} // type of presence
} // presence update or subscription
} // groupchat presence or regular presence
}