twilio-video/lib/preflight/getturncredentials.ts

Twilio Video JavaScript Library

/* eslint-disable camelcase */
const TwilioConnection = require('../twilioconnection.js');
const { ICE_VERSION } = require('../util/constants');
const { createTwilioError, SignalingConnectionError } = require('../util/twilio-video-errors');

import { RTCIceServer, RTCStats } from './rtctypes';
import { EventEmitter } from 'events';


export { RTCStats, RTCIceServer };
export function getTurnCredentials(token: string, wsServer: string): Promise<RTCIceServer[]> {
  return new Promise((resolve, reject) => {
    const eventObserver = new EventEmitter();
    const connectionOptions = {
      networkMonitor: null,
      eventObserver,
      helloBody: {
        edge: 'roaming', // roaming here means use same edge as signaling.
        preflight: true,
        token: token,
        type: 'ice',
        version: ICE_VERSION
      },
    };

    const twilioConnection = new TwilioConnection(wsServer, connectionOptions);
    let done = false;
    twilioConnection.once('close', () => {
      if (!done) {
        done = true;
        reject(new SignalingConnectionError());
      }
    });

    twilioConnection.on('message', (messageData: {
      code: number;
      message: string;
      ice_servers: RTCIceServer[];
      type: string;
    }) => {
      const { code, message, ice_servers, type } = messageData;
      if ((type === 'iced' || type === 'error') && !done) {
        done = true;
        if (type === 'iced') {
          resolve(ice_servers);
        } else {
          reject(createTwilioError(code, message));
        }
        twilioConnection.close();
      }
    });
  });
}