Add hidden participant support

JitsiConference.js

     this.room.muteParticipant(participant.getJid(), true);
 };
 
-JitsiConference.prototype.onMemberJoined = function (jid, nick, role) {
+/**
+ * Indicates that a participant has joined the conference.
+ *
+ * @param jid the jid of the participant in the MUC
+ * @param nick the display name of the participant
+ * @param role the role of the participant in the MUC
+ * @param isHidden indicates if this is a hidden participant (sysem participant,
+ * for example a recorder).
+ */
+JitsiConference.prototype.onMemberJoined
+    = function (jid, nick, role, isHidden) {
     var id = Strophe.getResourceFromJid(jid);
     if (id === 'focus' || this.myUserId() === id) {
        return;
     }
-    var participant = new JitsiParticipant(jid, this, nick);
+    var participant = new JitsiParticipant(jid, this, nick, isHidden);
     participant._role = role;
     this.participants[id] = participant;
     this.eventEmitter.emit(JitsiConferenceEvents.USER_JOINED, id, participant);

JitsiParticipant.js

 
 /**
  * Represents a participant in (a member of) a conference.
+ * @param jid the conference XMPP jid
+ * @param conference
+ * @param displayName
+ * @param isHidden indicates if this participant is a hidden participant
  */
-function JitsiParticipant(jid, conference, displayName){
+function JitsiParticipant(jid, conference, displayName, isHidden){
     this._jid = jid;
     this._id = Strophe.getResourceFromJid(jid);
     this._conference = conference;
         audio: undefined,
         video: undefined
     };
+    this._isHidden = isHidden;
 }
 
 /**
     return this._role === 'moderator';
 };
 
+/**
+ * @returns {Boolean} Whether this participant is a hidden participant. Some
+ * special system participants may want to join hidden (like for example the
+ * recorder).
+ */
+JitsiParticipant.prototype.isHidden = function() {
+    return this._isHidden;
+};
+
 // Gets a link to an etherpad instance advertised by the participant?
 //JitsiParticipant.prototype.getEtherpad = function() {
 //

modules/xmpp/ChatRoom.js

     member.jid = jid;
     member.isFocus
         = !!jid && jid.indexOf(this.moderator.getFocusUserJid() + "/") === 0;
+    member.isHiddenDomain
+        = !!jid && jid.indexOf("@") > 0
+            && this.options.hosts.hidden
+                === jid.substring(jid.indexOf("@") + 1, jid.indexOf("/"))
 
     $(pres).find(">x").remove();
     var nodes = [];
         }
         else {
             this.eventEmitter.emit(
-                XMPPEvents.MUC_MEMBER_JOINED, from, member.nick, member.role);
+                XMPPEvents.MUC_MEMBER_JOINED,
+                from, member.nick, member.role, member.isHiddenDomain);
         }
     } else {
         // Presence update for existing participant