social-butterfly/websub.js

Incorporate federated social network protocols easily. Used with Hello, world federated blog.

import { parseFeedAndInsertIntoDb } from './util/feeds';
import pubSubHubBub from 'pubsubhubbub';

export default function setupPush(options) {
  const webSubSubscriber = pubSubHubBub.createServer({
    callbackUrl: '/fakeCallbackUrl', // This is overridden when we call subscribe/unsubscribe. We need the host.
    secret: options.constants.pushSecret,
  });

  // TODO(mime): verify this is working correctly and remove console.log.
  webSubSubscriber.on('feed', async ({ topic, hub, callback, feed, headers }) => {
    console.log('WebSub feed: ', topic, hub, callback, feed, headers);

    const searchParams = new URL(callback).searchParams;
    const remoteUser = await options.getRemoteUser(
      searchParams.get('localUsername'),
      searchParams.get('remoteProfileUrl')
    );
    await parseFeedAndInsertIntoDb(options, remoteUser, feed);
  });

  webSubSubscriber.on('error', (err) => {
    console.log('WebSub error', err);
  });

  webSubSubscriber.on('subscribe', (data) => {
    console.log('WebSub subscribed: ', data);
  });

  webSubSubscriber.on('unsubscribe', (data) => {
    console.log('WebSub unsubscribed: ', data);
  });

  webSubSubscriber.on('denied', (data) => {
    console.log('WebSub denied: ', data);
  });

  return webSubSubscriber;
}