guide/dist/toGuide.js

Encrypted Globally Unique Identifier generator.

'use strict';

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

var _crypto = require('crypto');

var _crypto2 = _interopRequireDefault(_crypto);

var _base64Url = require('base64-url');

var _errors = require('./errors');

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

/**
 * @param initializationVectorValue Initialization vector. Must be at least 128 characters long.
 * @param namespace A namespace of the GUID (e.g. company name or the application name).
 * @param type A resource type name (e.g. article).
 */
/*:: import type {
  ToGuideType
} from './types';*/ // @flow

var toGuide /*: ToGuideType*/ = function toGuide(initializationVectorValue, namespace, type, id) {
  if (initializationVectorValue.length !== 128) {
    throw new _errors.GuideError('Initialization vector must be at least 128 characters long.');
  }

  var cipher = _crypto2.default.createCipher('aes-256-gcm', initializationVectorValue);

  var payload = JSON.stringify({
    id,
    namespace,
    type
  });

  var encrypted = Buffer.concat([cipher.update(payload, 'utf8'), cipher.final()]);

  var tag = cipher.getAuthTag();

  var guide = Buffer.concat([tag, encrypted]);

  return (0, _base64Url.escape)(guide.toString('base64'));
};

exports.default = toGuide;
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