jiti-meet/modules/members/MemberList.js

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/* global APP, require, $ */
/**
* This module is meant to (eventually) contain and manage all information
* about members/participants of the conference, so that other modules don't
* have to do it on their own, and so that other modules can access members'
* information from a single place.
*
* Currently this module only manages information about the support of jingle
* DTMF of the members. Other fields, as well as accessor methods are meant to
* be added as needed.
*/
var XMPPEvents = require("../../service/xmpp/XMPPEvents");
var Events = require("../../service/members/Events");
var EventEmitter = require("events");
var eventEmitter = new EventEmitter();
/**
* The actual container.
*/
var members = {};
/**
* There is at least one member that supports DTMF (i.e. is jigasi).
*/
var atLeastOneDtmf = false;
function registerListeners() {
APP.xmpp.addListener(XMPPEvents.MUC_MEMBER_JOINED, onMucMemberJoined);
APP.xmpp.addListener(XMPPEvents.MUC_MEMBER_LEFT, onMucMemberLeft);
}
/**
* Handles a new member joining the MUC.
*/
function onMucMemberJoined(jid, id, displayName) {
var member = {
displayName: displayName
};
APP.xmpp.getConnection().disco.info(
jid, "" /* node */, function(iq) { onDiscoInfoReceived(jid, iq); });
members[jid] = member;
}
/**
* Handles a member leaving the MUC.
*/
function onMucMemberLeft(jid) {
delete members[jid];
updateAtLeastOneDtmf();
}
/**
* Handles the reception of a disco#info packet from a particular JID.
* @param jid the JID sending the packet.
* @param iq the packet.
*/
function onDiscoInfoReceived(jid, iq) {
if (!members[jid])
return;
var supportsDtmf
= $(iq).find('>query>feature[var="urn:xmpp:jingle:dtmf:0"]').length > 0;
updateDtmf(jid, supportsDtmf);
}
/**
* Updates the 'supportsDtmf' field for a member.
* @param jid the jid of the member.
* @param newValue the new value for the 'supportsDtmf' field.
*/
function updateDtmf(jid, newValue) {
var oldValue = members[jid].supportsDtmf;
members[jid].supportsDtmf = newValue;
if (newValue != oldValue) {
updateAtLeastOneDtmf();
}
}
/**
* Checks each member's 'supportsDtmf' field and updates
* 'atLastOneSupportsDtmf'.
*/
function updateAtLeastOneDtmf() {
var newAtLeastOneDtmf = false;
for (var key in members) {
if (typeof members[key].supportsDtmf !== 'undefined'
&& members[key].supportsDtmf) {
newAtLeastOneDtmf= true;
break;
}
}
if (atLeastOneDtmf != newAtLeastOneDtmf) {
atLeastOneDtmf = newAtLeastOneDtmf;
eventEmitter.emit(Events.DTMF_SUPPORT_CHANGED, atLeastOneDtmf);
}
}
/**
* Exported interface.
*/
var Members = {
start: function() {
registerListeners();
},
addListener: function(type, listener) {
eventEmitter.on(type, listener);
},
removeListener: function (type, listener) {
eventEmitter.removeListener(type, listener);
},
size: function () {
return Object.keys(members).length;
},
getMembers: function () {
return members;
}
};
module.exports = Members;