prehash password

normalize-to-string.js

export default function normalizeToString(input) {
  // string or String object
  if (typeof input === 'string' || input instanceof String) return input.toString();

  // boolean value
  if (typeof input === 'boolean') return input.toString();

  // numeric value
  if (typeof input === 'number' || input instanceof Number) {
    // not a finite value - invalid input - return empty
    if (!Number.isFinite(input)) return '';

    // safe integer, return as-is
    if (Number.isSafeInteger(input)) return input.toString(10);

    // not a safe integer, return with 5 decimal places
    return input.toFixed(5); // fix to 4 decimal places
  }

  // if there's a JSON method, use the result of that
  if (typeof input.toJSON === 'function') {
    const ret = input.toJSON();
    if (typeof ret === 'string') return ret;
  }

  // unsupported value - empty string
  return '';
}

password-prehash.js

import normalizeToString from './normalize-to-string';

export default function normalizeKeyValue(input) {
  let result = normalizeToString(input);

  // no input
  if (!result) return '';

  // input too long - can cause regex issues down below
  if (result.length > 1024) return '';

  // normalize unicode - ensure input will always be in the same structure
  result = result.normalize('NFKC');

  // replace all whitespace characters with space
  // eslint-disable-next-line no-irregular-whitespace
  result = result.replace(/[ \f\n\r\t\v\u00A0\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u2028\u2029\u2028\u2029\u202f\u205f\u3000]/g, ' ');

  // trim - handle copy-paste issues
  result = result.trim();

  return result;
}