Платформа cron-задач: история, оповещения и API рядом с расписаниями

import tls from 'node:tls';
import net from 'node:net';

async function checkExpiry(hostname) {
  return new Promise((resolve, reject) => {
    const socket = tls.connect({ host: hostname, port: 443 }, () => {
      const cert = socket.getPeerCertificate();
      socket.destroy();
      resolve(new Date(cert.valid_to));
    });
    socket.on('error', reject);
  });
}

export async function handler(event) {
  const domains = process.env.DOMAINS_TO_MONITOR?.split(',') ?? [];
  const results = await Promise.all(
    domains.map(async (d) => ({ domain: d, expiry: await checkExpiry(d) })),
  );
  const expiringSoon = results.filter(
    (r) => r.expiry.getTime() - Date.now() < 30 * 86_400_000,
  );
  if (expiringSoon.length > 0) await sendAlert(expiringSoon);
  return { checked: domains.length, expiringSoon: expiringSoon.length };
}