feat(external_api): Expose the Etherpad SharedDocument URL

modules/API/API.js

@@ -1050,6 +1050,12 @@ function initCommands() {
             callback(getRoomsInfo(APP.store.getState()));
             break;
         }
+        case 'get-shared-document-url': {
+            const { etherpad } = APP.store.getState()['features/etherpad'];
+
+            callback(etherpad?.documentUrl || '');
+            break;
+        }
         case 'get-p2p-status': {
             callback(isP2pActive(APP.store.getState()));
             break;

modules/API/external/external_api.js

@@ -682,6 +682,17 @@ export default class JitsiMeetExternalAPI extends EventEmitter {
         });
     }
 
+    /**
+     * Returns the Shared Document Url of the conference.
+     *
+     * @returns {Object} Rooms info.
+     */
+    async getSharedDocumentUrl() {
+        return this._transport.sendRequest({
+            name: 'get-shared-document-url'
+        });
+    }
+
     /**
      * Returns whether the conference is P2P.
      *