bip-pod-flow/nonce.js

Pipeline Flow Pod for Bipio

/**
 *
 * The Bipio Flow Pod.  nonce action definition
 * ---------------------------------------------------------------
 *
 * Copyright (c) 2017 InterDigital, Inc. 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.
 */

function Nonce(podConfig) {
}

Nonce.prototype = {};

function randStr (bits) {
  var chars, rand, i, ret;

  chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789_-';
  ret = '';

  // in v8, Math.random() yields 32 pseudo-random bits (in spidermonkey it gives 53)
  while (bits > 0) {
    // 32-bit integer
    rand = Math.floor(Math.random() * 0x100000000);
    // base 64 means 6 bits per character, so we use the top 30 bits from rand to give 30/6=5 characters.
    for (i = 26; i > 0 && bits > 0; i -= 6, bits -= 6) {
      ret += chars[0x3F & rand >>> i];
    }
  }

  return ret;
}

/**
 * Invokes (runs) the action.
 */
Nonce.prototype.invoke = function(imports, channel, sysImports, contentParts, next) {
  next(false, {
    'nonce' : randStr(64)
  });
}

// -----------------------------------------------------------------------------
module.exports = Nonce;