external_api: add command to set E2EE key

modules/API/API.js

     setSubject
 } from '../../react/features/base/conference';
 import { parseJWTFromURLParams } from '../../react/features/base/jwt';
+import { setE2EEKey } from '../../react/features/e2ee';
 import { invite } from '../../react/features/invite';
 import { toggleTileView } from '../../react/features/video-layout';
 import { getJitsiMeetTransport } from '../transport';
             } catch (err) {
                 logger.error('Failed sending endpoint text message', err);
             }
+        },
+        'e2ee-key': key => {
+            logger.debug('Set E2EE key command received');
+            APP.store.dispatch(setE2EEKey(key));
         }
     };
     transport.on('event', ({ data, name }) => {

modules/API/external/external_api.js

 const commands = {
     avatarUrl: 'avatar-url',
     displayName: 'display-name',
+    e2eeKey: 'e2ee-key',
     email: 'email',
     hangup: 'video-hangup',
     password: 'password',
      * information about the initial devices that will be used in the call.
      * @param {Object} [options.userInfo] - Object containing information about
      * the participant opening the meeting.
+     * @param {string}  [options.e2eeKey] - The key used for End-to-End encryption.
+     * THIS IS EXPERIMENTAL.
      */
     constructor(domain, ...args) {
         super();
             onload = undefined,
             invitees,
             devices,
-            userInfo
+            userInfo,
+            e2eeKey
         } = parseArguments(args);
 
         this._parentNode = parentNode;
         if (Array.isArray(invitees) && invitees.length > 0) {
             this.invite(invitees);
         }
+        this._tmpE2EEKey = e2eeKey;
         this._isLargeVideoVisible = true;
         this._numberOfParticipants = 0;
         this._participants = {};
             const userID = data.id;
 
             switch (name) {
-            case 'video-conference-joined':
+            case 'video-conference-joined': {
+                if (typeof this._tmpE2EEKey !== 'undefined') {
+                    this.executeCommand(commands.e2eeKey, this._tmpE2EEKey);
+                    this._tmpE2EEKey = undefined;
+                }
+
                 this._myUserID = userID;
                 this._participants[userID] = {
                     avatarURL: data.avatarURL
                 };
+            }
 
             // eslint-disable-next-line no-fallthrough
             case 'participant-joined': {