utils.js

/* eslint no-param-reassign: off, import/prefer-default-export: off */
const jwt = require('jsonwebtoken');
const { cert } = require('./config');

const interval = (fn, initialTTL, output = { id: null, clear: () => undefined }) => {
  const timeoutID = setTimeout(async () => {
    let TTL;
    try {
      TTL = fn();
      if (TTL instanceof Promise) {
        TTL = await TTL;
      }
    } catch (error) {
      console.error(error);
      TTL = initialTTL;
    }
    const nextTTL = parseInt(TTL, 10) || initialTTL;
    interval(fn, nextTTL, output);
  }, initialTTL);
  output.id = timeoutID;
  output.clear = () => clearTimeout(timeoutID);
  return output;
};

const generateRandomString = (length) => {
  let text = '';
  const possible =
    'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-,;:!?./§ù*^$£%µ&"\'(=';

  for (let i = 0; i < length; i += 1) {
    text += possible.charAt(Math.floor(Math.random() * possible.length));
  }

  return text;
};

const createSignedJWT = () =>
  jwt.sign({ state: generateRandomString(20) }, cert, { algorithm: 'RS256' });

module.exports = { interval, createSignedJWT };