HR/CryptoSync

'use strict'
/**
 * MasterPass.js
 * Provides a way to securely set and retrieve the MasterPass globally
 ******************************/

// private static class member
// var MP = Symbol()
// module.exports = class MasterPassKey {
//     static get() {
//         return this[MP]
//     }
//     static set(mp) {
//         this[MP] = mp
//     }
// }

const MasterPassKey = (function () {
  const mpk = new WeakMap()

  function MasterPassKey (key) {
    mpk.set(this, key)
  }

  MasterPassKey.prototype.get = function () {
    if (mpk.get(this) === undefined) {
      return new Error('MasterPassKey is not set')
    } else {
      return mpk.get(this)
    }
  }

  MasterPassKey.prototype.set = function (key) {
    if (key instanceof Buffer) {
      mpk.set(this, key)
    } else {
      throw new Error('MasterPassKey not a Buffer')
    }
  }

  MasterPassKey.prototype.delete = function (key) {
    mpk.delete(this)
  }

  return MasterPassKey
}())

module.exports = MasterPassKey