text: /**
   * Copyright 2015 The AMP HTML Authors. All Rights Reserved.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS-IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  var argv = require('minimist')(process.argv.slice(2));
  var crypto = require('crypto');
  
  // Used to e.g. references the ads binary from the runtime to get
  // version lock.
  exports.VERSION = argv.version ?
      String(argv.version) : String(new Date().getTime());
  
  // A token that changes its value each time we release AMP. This is intended
  // to verify that two iframes of AMP have the same version of AMP. It is
  // also intended to make running iframes with custom software very unpleasant,
  // so that we are more likely to have everybody on the same version.
  exports.TOKEN = getToken();
  
  function getToken() {
    var task = process.argv[2];
    // For tests build parent and child frame can get out of sync because
    // we do not version lock them. To fix this we use a fixed token.
    if (!task || task == 'build' || task == 'test') {
      return 'development--token';
    }
    // For every other build, most importantly `dist` we assume production.
    return crypto.createHmac(
        'sha256', crypto.randomBytes(16)).update(exports.VERSION)
        .digest('hex');
  }
  