Did CoWIN deploy JS yet?

index.js

/**
 * This could probably be done in like three lines of shell script
 * but I have no idea how to write those.
 *
 * run `npm init -y`
 * run `npm i node-fetch jsdom`
 * run `node index.js`
 * turn Slack notifications on
 * and go to bed.
 *
 * But wake up every hour to check your notifications.
 */

const fetch = require('node-fetch');
const jsdom = require('jsdom');
const { JSDOM } = jsdom;

const url = `https://selfregistration.cowin.gov.in`;
const slackWebhookUrl = ''; // TODO: https://api.slack.com/messaging/webhooks

function getScriptPath(text) {
  const dom = new JSDOM(text);

  return `${url}/${dom.window.document.querySelector('script').src}`;
}

function fetchScriptLastModified(path) {
  return fetch(path).then((res) => {
    const headers = res.headers;

    return headers.get('last-modified');
  });
}

function isAfter24(date) {
  const d = new Date(date);

  return d.getDate() > 24;
}

function sleep(time) {
  return new Promise((resolve) => {
    setTimeout(resolve, time);
  });
}

async function main() {
  while (true) {
    const d = new Date();

    console.log('Checking at', d.toLocaleTimeString());
    const changed = await check();

    if (changed) {
      break;
    }

    // sleep for 5 mins
    await sleep(300000);
  }
}

function check() {
  return fetch(url)
    .then((res) => res.text())
    .then(getScriptPath)
    .then(fetchScriptLastModified)
    .then((lastModifiedAt) => {
      if (isAfter24(lastModifiedAt)) {
        fetch(slackWebhookUrl, {
          body: JSON.stringify({
            text: `JS bundle's last modified header changed to ${lastModifiedAt}`,
          }),
          headers: {
            'Content-Type': 'application/json',
          },
          method: 'POST',
        });

        return true;
      } else {
        return false;
      }
    });
}

main();