cleanup: remove no longer used code 🔥🔥🔥

The code for handling device availability has been disabled for a long time,
plus it's ill named since it represents 2 abstractions: lack of permissions and
lack of devices.

Time for it to rest in the git graveyard.

JitsiConference.js

@@ -131,10 +131,6 @@ export default function JitsiConference(options) {
         audio: false,
         video: false
     };
-    this.availableDevices = {
-        audio: undefined,
-        video: undefined
-    };
     this.isMutedByFocus = false;
 
     // Flag indicates if the 'onCallEnded' method was ever called on this
@@ -256,8 +252,6 @@ JitsiConference.prototype._init = function(options = {}) {
     this.room.addListener(
         XMPPEvents.CONNECTION_ESTABLISHED, this._onIceConnectionEstablished);
 
-    this.room.updateDeviceAvailability(RTC.getDeviceAvailability());
-
     this._updateProperties = this._updateProperties.bind(this);
     this.room.addListener(XMPPEvents.CONFERENCE_PROPERTIES_CHANGED,
         this._updateProperties);

JitsiConferenceEventManager.js

@@ -391,52 +391,6 @@ JitsiConferenceEventManager.prototype.setupChatRoomListeners = function() {
         }
     });
 
-    chatRoom.addPresenceListener('devices', (data, from) => {
-        let isAudioAvailable = false;
-        let isVideoAvailable = false;
-
-        data.children.forEach(config => {
-            if (config.tagName === 'audio') {
-                isAudioAvailable = config.value === 'true';
-            }
-            if (config.tagName === 'video') {
-                isVideoAvailable = config.value === 'true';
-            }
-        });
-
-        let availableDevices;
-
-        if (conference.myUserId() === from) {
-            availableDevices = conference.availableDevices;
-        } else {
-            const participant = conference.getParticipantById(from);
-
-            if (!participant) {
-                return;
-            }
-
-            availableDevices = participant._availableDevices;
-        }
-
-        let updated = false;
-
-        if (availableDevices.audio !== isAudioAvailable) {
-            updated = true;
-            availableDevices.audio = isAudioAvailable;
-        }
-
-        if (availableDevices.video !== isVideoAvailable) {
-            updated = true;
-            availableDevices.video = isVideoAvailable;
-        }
-
-        if (updated) {
-            conference.eventEmitter.emit(
-                JitsiConferenceEvents.AVAILABLE_DEVICES_CHANGED,
-                from, availableDevices);
-        }
-    });
-
     if (conference.statistics) {
         // FIXME ICE related events should end up in RTCEvents eventually
         chatRoom.addListener(XMPPEvents.CONNECTION_ICE_FAILED,
@@ -494,10 +448,6 @@ JitsiConferenceEventManager.prototype.setupRTCListeners = function() {
         conference.eventEmitter.emit(JitsiConferenceEvents.DATA_CHANNEL_OPENED);
     });
 
-    rtc.addListener(
-        RTCEvents.AVAILABLE_DEVICES_CHANGED,
-        devices => conference.room.updateDeviceAvailability(devices));
-
     rtc.addListener(RTCEvents.ENDPOINT_MESSAGE_RECEIVED,
         (from, payload) => {
             const participant = conference.getParticipantById(from);

JitsiConferenceEvents.js

@@ -7,11 +7,6 @@
  */
 export const AUTH_STATUS_CHANGED = 'conference.auth_status_changed';
 
-/**
- * Indicates that available devices changed.
- */
-export const AVAILABLE_DEVICES_CHANGED = 'conference.availableDevicesChanged';
-
 /**
  * A participant avatar has changed.
  */

JitsiParticipant.js

@@ -34,10 +34,6 @@ export default class JitsiParticipant {
         this._tracks = [];
         this._role = 'none';
         this._status = status;
-        this._availableDevices = {
-            audio: undefined,
-            video: undefined
-        };
         this._hidden = hidden;
         this._statsID = statsID;
         this._connectionStatus = ParticipantConnectionStatus.ACTIVE;

doc/API.md

@@ -117,7 +117,6 @@ JitsiMeetJS.setLogLevel(JitsiMeetJS.logLevels.ERROR);
         - KICKED - notifies that user has been kicked from the conference.
         - START_MUTED_POLICY_CHANGED - notifies that all new participants will join with muted audio/video stream (parameters - JS object with 2 properties - audio(boolean), video(boolean))
         - STARTED_MUTED - notifies that the local user has started muted
-        - AVAILABLE_DEVICES_CHANGED - notifies that available participant devices changed (camera or microphone was added or removed) (parameters - id(string), devices(JS object with 2 properties - audio(boolean), video(boolean)))
         - CONNECTION_STATS - New local connection statistics are received. (parameters - stats(object))
         - BEFORE_STATISTICS_DISPOSED - fired just before the statistics module is disposed and it's the last chance to submit some logs to the statistics service, before it gets disconnected
         - AUTH_STATUS_CHANGED - notifies that authentication is enabled or disabled, or local user authenticated (logged in). (parameters - isAuthEnabled(boolean), authIdentity(string))

modules/RTC/RTCUtils.js

@@ -511,8 +511,6 @@ function setAvailableDevices(um, stream) {
     if (um.indexOf('audio') !== -1) {
         devices.audio = audioTracksReceived;
     }
-
-    eventEmitter.emit(RTCEvents.AVAILABLE_DEVICES_CHANGED, devices);
 }
 
 /**

modules/xmpp/ChatRoom.js

@@ -211,26 +211,6 @@ export default class ChatRoom extends Listenable {
         }
     }
 
-    /**
-     *
-     * @param devices
-     */
-    updateDeviceAvailability(devices) {
-        this.presMap.nodes.push({
-            'tagName': 'devices',
-            'children': [
-                {
-                    'tagName': 'audio',
-                    'value': devices.audio
-                },
-                {
-                    'tagName': 'video',
-                    'value': devices.video
-                }
-            ]
-        });
-    }
-
     /**
      * Joins the chat room.
      * @param password

service/RTC/RTCEvents.js

@@ -30,7 +30,6 @@ const RTCEvents = {
      */
     LOCAL_TRACK_SSRC_UPDATED: 'rtc.local_track_ssrc_updated',
 
-    AVAILABLE_DEVICES_CHANGED: 'rtc.available_devices_changed',
     TRACK_ATTACHED: 'rtc.track_attached',
 
     /**