UPDATE: I'm describing a new method now which doesn't require the client to send requests.
Background: When the client joins a group chat, the server returns presence stanzas which contain information about the connected users to the group chat.
cl.on('stanza', function(stanza) {
// always log error stanzas
if (stanza.attrs.type == 'error') {
util.log('[error] ' + stanza);
return;
}
if(stanza.is('presence')){
// We are only interested in stanzas with <x> in the payload or it will throw some errors
if(stanza.getChild('x') !== undefined) {
// Deciding what to do based on the xmlns attribute
var _presXmlns = stanza.getChild('x').attrs.xmlns;
switch(_presXmlns) {
// If someone is joining or leaving
case 'http://jabber.org/protocol/muc#user':
// Get the role of joiner/leaver
_presRole = stanza.getChild('x').getChild('item').attrs.role;
// Get the JID of joiner/leaver
_presJID = stanza.getChild('x').getChild('item').attrs.jid;
// Get the nick of joiner/leaver
_presNick = stanza.attrs.from.split('/')[1];
// If it's not none, this user must be joining or changing his nick
if(_presRole !== 'none') {
// We are now handling the data of joinging / nick changing users. I recommend to use an in-memory store like 'dirty' [https://github.com/felixge/node-dirty] to store information of the users currentliy in the group chat.
} else {
// We are now handling the data of leaving users
}
break;
}
return;
}
return;
}
OLD METHOD
I previously described a method how to query the server for current users in the group chat. By maintaining a store where all user traffic (joining, leaving, nick changing) is stored, this is no longer required. However you could still use it to make sure the data is consistent by issues like a presence stanza was not delivered to the client correctly. That's the reason it's still described below:
To request a list with users connected to the room, you need to perform the following actions:
First send a request to the server and ask for the user list:
cl.send(new xmpp.Element('iq', {from: jid, to: room_jid, type: 'get' }).c('query', { xmlns: 'http://jabber.org/protocol/disco#items' }));
then listen for iq-stanzas, parse them and populate an array with the data:
// Catching the requested user list
if(stanza.is('iq')){
// Fetching usernames from return data (data structure: http://xmpp.org/extensions/xep-0045.html#example-12)
var _items = stanza.getChild('query').getChildren('item');
var users = new Array();
for(var i = 0; i<_items.length; i++) {
// We are building an object here to add more data later
users[i] = new Object();
users[i]['name'] = _items[i].attrs.name;
}
console.log(util.inspect(users, {depth: null, colors: true}));
return;
}
This will provide you with a user list. To request unique JIDs you have to probe every user. To keep the list up to date, you should remove users when they leave and add + probe when they join.