helpers get-short-token.js

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const randomBytes = require('./random-bytes');
const randomDigits = require('./random-digits');
 
module.exports = getShortToken;
 
async function getShortToken (len, ifDigits) {
  if (ifDigits) {
    return randomDigits(len);
  }
 
  const str1 = await randomBytes(Math.floor(len / 2) + 1);
  let str = str1.substr(0, len);
 
  if (str.match(/^[0-9]+$/)) { // tests will fail on all digits
    str = `q${str.substr(1)}`; // shhhh, secret.
  }
 
  return str;
}