feat(branding) allow invite links to be branded

config.js

      tokenAuthUrl
      */
 
+    /**
+     * This property can be used to alter the generated meeting invite links (in combination with a branding domain
+     * which is retrieved internally by jitsi meet) (e.g. https://meet.jit.si/someMeeting
+     * can become https://brandedDomain/roomAlias)
+     */
+    // brandingRoomAlias: null,
+
     // List of undocumented settings used in lib-jitsi-meet
     /**
      _peerConnStatusOutOfLastNTimeout

react/features/base/config/configWhitelist.js

 
     'channelLastN',
     'constraints',
+    'brandingRoomAlias',
     'debug',
     'debugAudioLevels',
     'defaultLanguage',

react/features/base/connection/functions.js

         throw new Error('Can not get invite URL - the app is not ready');
     }
 
-    return getURLWithoutParams(locationURL).href;
+    const { inviteDomain } = state['features/dynamic-branding'];
+    const urlWithoutParams = getURLWithoutParams(locationURL);
+
+    if (inviteDomain) {
+        const meetingId
+            = state['features/base/config'].brandingRoomAlias || urlWithoutParams.pathname;
+
+        return `${inviteDomain}/${meetingId}`;
+    }
+
+    return urlWithoutParams.href;
 }
 
 /**

react/features/dynamic-branding/actions.js

     };
 }
 
-
 /**
  * Action used to signal the branding elements are ready to be displayed.
  *

react/features/dynamic-branding/reducer.js

     backgroundColor: '',
     backgroundImageUrl: '',
     customizationReady: false,
+    inviteDomain: '',
     logoClickUrl: '',
     logoImageUrl: ''
 };
 ReducerRegistry.register(STORE_NAME, (state = DEFAULT_STATE, action) => {
     switch (action.type) {
     case SET_DYNAMIC_BRANDING_DATA: {
-        const { backgroundColor, backgroundImageUrl, logoClickUrl, logoImageUrl } = action.value;
+        const { backgroundColor, backgroundImageUrl, inviteDomain, logoClickUrl, logoImageUrl } = action.value;
 
         return {
             backgroundColor,
             backgroundImageUrl,
+            inviteDomain,
             logoClickUrl,
             logoImageUrl,
             customizationReady: true