feat(visitors): Handles visitors-supported received from jicofo.

The value is passed to max occupants failure so we can take action on it.

Author: damencho

modules/xmpp/ChatRoom.ts

@@ -1586,7 +1586,9 @@ export default class ChatRoom extends Listenable {
         } else if ($(pres).find('>error>service-unavailable').length) {
             logger.warn('Maximum users limit for the room has been reached',
                 pres);
-            this.eventEmitter.emit(XMPPEvents.ROOM_MAX_USERS_ERROR);
+            this.eventEmitter.emit(XMPPEvents.ROOM_MAX_USERS_ERROR, {
+                visitorsSupported: this.xmpp.moderator.visitorsSupported
+            });
         } else if ($(pres)
             .find(
                 '>error[type="auth"]'

modules/xmpp/moderator.js

@@ -58,6 +58,10 @@ export default class Moderator extends Listenable {
         // availability.
         this.sipGatewayEnabled = false;
 
+        // Response to conference request may contain whether visitors are supported
+        // in certain cases we need to know this to be able to get decisions on some errors (max-occupants reached)
+        this.visitorsSupported = false;
+
         this.xmpp = xmpp;
         this.connection = xmpp.connection;
 
@@ -413,6 +417,8 @@ export default class Moderator extends Listenable {
             return;
         }
 
+        this.visitorsSupported = conferenceRequest.properties['visitors-supported'];
+
         if (conferenceRequest.ready) {
             // Reset the non-error timeout (because we've succeeded here).
             this.getNextTimeout(true);