electron-compile/lib/digest-for-object.js

Electron supporting package to compile JS and CSS in Electron applications

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _keys = require('babel-runtime/core-js/object/keys');

var _keys2 = _interopRequireDefault(_keys);

var _typeof2 = require('babel-runtime/helpers/typeof');

var _typeof3 = _interopRequireDefault(_typeof2);

exports.default = createDigestForObject;

var _crypto = require('crypto');

var _crypto2 = _interopRequireDefault(_crypto);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

function updateDigestForJsonValue(shasum, value) {
  // Implmentation is similar to that of pretty-printing a JSON object, except:
  // * Strings are not escaped.
  // * No effort is made to avoid trailing commas.
  // These shortcuts should not affect the correctness of this function.
  var type = typeof value === 'undefined' ? 'undefined' : (0, _typeof3.default)(value);

  if (type === 'string') {
    shasum.update('"', 'utf8');
    shasum.update(value, 'utf8');
    shasum.update('"', 'utf8');
    return;
  }

  if (type === 'boolean' || type === 'number') {
    shasum.update(value.toString(), 'utf8');
    return;
  }

  if (!value) {
    shasum.update('null', 'utf8');
    return;
  }

  if (Array.isArray(value)) {
    shasum.update('[', 'utf8');
    for (var i = 0; i < value.length; i++) {
      updateDigestForJsonValue(shasum, value[i]);
      shasum.update(',', 'utf8');
    }
    shasum.update(']', 'utf8');
    return;
  }

  // value must be an object: be sure to sort the keys.
  var keys = (0, _keys2.default)(value);
  keys.sort();

  shasum.update('{', 'utf8');

  for (var _i = 0; _i < keys.length; _i++) {
    updateDigestForJsonValue(shasum, keys[_i]);
    shasum.update(': ', 'utf8');
    updateDigestForJsonValue(shasum, value[keys[_i]]);
    shasum.update(',', 'utf8');
  }

  shasum.update('}', 'utf8');
}

/**
 * Creates a hash from a JS object
 * 
 * @private  
 */
function createDigestForObject(obj) {
  var sha1 = _crypto2.default.createHash('sha1');
  updateDigestForJsonValue(sha1, obj);

  return sha1.digest('hex');
}
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