Vk Access Token js

// requires https.js
function AccessToken() {}

AccessToken.prototype = {
  get isExpired () {
    return this.expiresIn && Date.now() > this.created + this.expiresIn * 1000;
  },
  fromResponse: function(response) {
    this.accessToken = response.access_token;
    this.email = response.email;
    this.expiresIn = response.expires_in;
    this.secret = response.secret;
    this.userId = response.user_id;
    this.created = Date.now();
    return this;
  },
  /*
  var token = new AccessToken().fromJSON('{"access_token":"533bacf01e11f55b536a565b57531ac114461ae8736d6506a3","expires_in":43200, "user_id":6492}');
  console.log(token.isExpired); // false
  token.created = 0;
  console.log(token.isExpired); // true
  */
  /*
  fromJSON: function(str) {
    return this.fromResponse(JSON.parse(str));
  },
  // var token = new AccessToken().fromHash("http://REDIRECT_URI#access_token=533bacf01e11f55b536a565b57531ad114461ae8736d6506a3&expires_in=86400&user_id=8492")
  fromHash: function(url) {
    var hash = url.replace(/.*#/, '');
    var response = parseQueryString(hash);
    if (response.expires_in) {
      response.expires_in = parseInt(response.expires_in);
    }
    if (response.user_id) {
      response.user_id = parseInt(response.user_id);
    }
    return this.fromResponse(response);
  },
  */
  SERIALIZED_PROPERTIES: ['accessToken', 'created', 'email', 'expiresIn',
    'secret', 'userId'],
  // localStorage.setItem('access_token', accessToken.serialize())
  serialize: function() {
    var self = this;
    var o = {};
    self.SERIALIZED_PROPERTIES.forEach(function(p) {
      if (self[p] != null) {
        o[p] = self[p];
      }
    });
    return JSON.stringify(o);
  },
  /*
  var token = new AccessToken();
  var serialized = localStorage.getItem('access_token');
  if (serialized) {
    token.parse(serialized);
  }
  */
  parse: function(serialized) {
    var self = this;
    var o = JSON.parse(serialized);
    self.SERIALIZED_PROPERTIES.forEach(function(p) {
      self[p] = o[p];
    });
    return self;
  },
};