hyper/app/notifications.js

const ms = require('ms');
const fetch = require('node-fetch');

const {version} = require('./package');

const NEWS_URL = 'https://hyper-news.now.sh';

module.exports = function fetchNotifications(win) {
  const {rpc} = win;
  const retry = err => {
    setTimeout(() => fetchNotifications(win), ms('30m'));
    if (err) {
      console.error('Notification messages fetch error', err.stack);
    }
  };

  console.log('Checking for notification messages');
  fetch(NEWS_URL, {
    headers: {
      'X-Hyper-Version': version,
      'X-Hyper-Platform': process.platform
    }
  })
  .then(res => res.json())
  .then(data => {
    const {message} = data || {};
    if (typeof message !== 'object' && message !== '') {
      throw new Error('Bad response');
    }
    if (message === '') {
      console.log('No matching notification messages');
    } else {
      rpc.emit('add notification', message);
    }

    retry();
  })
  .catch(retry);
};