parse-js/dist/lib/base64.js

Utility library for object structure conversion.

'use strict';

var Base64 = require('compact-base64');

var _rBase64 = /^[ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/]+=*$/; // eslint-disable-next-line no-control-regex

var _rNonPrintable = /[\x00-\x08\x0E-\x1F\x7F\x80-\x9F]/;

function isBase64SizeCorrect(v) {
  if (typeof v !== 'string') return false;
  if (v.length * 6 % 8 !== 0) return false;
  return true;
}

function isBase64FormatCorrect(v) {
  if (typeof v !== 'string') return false;
  return _rBase64.test(v);
}

function isBase64Printable(v) {
  if (typeof v !== 'string') return false;

  try {
    var value = Base64.decode(v);
    return !_rNonPrintable.test(value);
  } catch (err) {// compact-base64 can't handle some Base64 binary strings correctly.
  }

  return false;
}

function isBase64(v) {
  var _ref = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {},
      _ref$allowBinary = _ref.allowBinary,
      allowBinary = _ref$allowBinary === void 0 ? false : _ref$allowBinary;

  if (!isBase64SizeCorrect(v)) return false;
  if (!isBase64FormatCorrect(v)) return false;
  return allowBinary || isBase64Printable(v);
}

module.exports = {
  isBase64: isBase64,
  isBase64Printable: isBase64Printable,
  isBase64SizeCorrect: isBase64SizeCorrect,
  isBase64FormatCorrect: isBase64FormatCorrect,
  encode: Base64.encode,
  decode: Base64.decode
};