oidc-provider/lib/helpers/user_codes.js

OAuth 2.0 Authorization Server implementation for Node.js with OpenID Connect

import { customAlphabet } from 'nanoid';

const CHARSETS = {
  'base-20': 'BCDFGHJKLMNPQRSTVWXZ',
  digits: '0123456789',
};

export function generate(charset, mask) {
  const length = mask.split('*').length - 1;
  if (typeof CHARSETS[charset] !== 'function') {
    CHARSETS[charset] = customAlphabet(CHARSETS[charset]);
  }
  const generated = CHARSETS[charset](length).split('');
  return mask.split('').map((p) => {
    if (p === '*') {
      return generated.shift();
    }

    return p;
  }).join('');
}

export function denormalize(normalized, mask) {
  const chars = normalized.split('');
  return mask.split('').map((p) => {
    if (p === '*') {
      return chars.shift();
    }

    return p;
  }).join('');
}

export function normalize(input) {
  return input
    .replace(/[a-z]/g, (char) => char.toUpperCase())
    .replace(/\W/g, () => '');
}