braintree-web/data-collector/kount.js

A suite of tools for integrating Braintree in the browser

"use strict";

var sjcl = require("./vendor/sjcl");
var camelCaseToSnakeCase = require("../lib/camel-case-to-snake-case");

var QA_URL = "https://assets.qa.braintreepayments.com/data";
var IFRAME_ID_PREFIX = "braintreeDataFrame-";
var environmentUrls = {
  development: QA_URL,
  qa: QA_URL,
  sandbox: "https://assets.braintreegateway.com/sandbox/data",
  production: "https://assets.braintreegateway.com/data",
};
var cachedDeviceData = {};

function setup(o) {
  var options = o != null ? o : {};

  return new Kount(options);
}

function Kount(options) {
  var previouslyInitializedDeviceData = Kount.getCachedDeviceData(
    options.merchantId
  );

  if (previouslyInitializedDeviceData) {
    this.deviceData = previouslyInitializedDeviceData;
    this._isCached = true;

    return;
  }

  this._currentEnvironment = this._initializeEnvironment(options);

  sjcl.random.startCollectors();

  this._deviceSessionId = this._generateDeviceSessionId();
  this.deviceData = this._getDeviceData();

  Kount.setCachedDeviceData(options.merchantId, this.deviceData);

  this._iframe = this._setupIFrame();
}

Kount.getCachedDeviceData = function (merchantId) {
  return cachedDeviceData[merchantId];
};

Kount.setCachedDeviceData = function (merchantId, data) {
  cachedDeviceData[merchantId] = data;
};

Kount.prototype.teardown = function () {
  if (!this._isCached) {
    sjcl.random.stopCollectors();

    this._removeIframe();
  }
};

Kount.prototype._removeIframe = function () {
  this._iframe.parentNode.removeChild(this._iframe);
};

Kount.prototype._getDeviceData = function () {
  return camelCaseToSnakeCase({
    deviceSessionId: this._deviceSessionId,
    fraudMerchantId: this._currentEnvironment.id,
  });
};

Kount.prototype._generateDeviceSessionId = function () {
  var bits, hexString;

  bits = sjcl.random.randomWords(4, 0);
  hexString = sjcl.codec.hex.fromBits(bits);

  return hexString;
};

Kount.prototype._setupIFrame = function () {
  var params, iframe;
  var self = this;

  params = "?m=" + this._currentEnvironment.id + "&s=" + this._deviceSessionId;

  iframe = document.createElement("iframe");
  iframe.width = 1;
  iframe.id = IFRAME_ID_PREFIX + this._deviceSessionId;
  iframe.height = 1;
  iframe.frameBorder = 0;
  iframe.scrolling = "no";
  iframe.style.position = "fixed";
  iframe.style.left = "-999999px";
  iframe.style.top = "-999999px";
  iframe.title = "Braintree-Kount-iframe";
  iframe.setAttribute("aria-hidden", "true");

  document.body.appendChild(iframe);
  setTimeout(function () {
    iframe.src = self._currentEnvironment.url + "/logo.htm" + params;
    iframe.innerHTML =
      '<img src="' +
      self._currentEnvironment.url +
      "/logo.gif" +
      params +
      '" alt="" />';
  }, 10);

  return iframe;
};

Kount.prototype._initializeEnvironment = function (options) {
  var url = environmentUrls[options.environment];

  if (url == null) {
    throw new Error(
      options.environment + " is not a valid environment for kount.environment"
    );
  }

  return {
    url: url,
    name: options.environment,
    id: options.merchantId,
  };
};

module.exports = {
  setup: setup,
  Kount: Kount,
  environmentUrls: environmentUrls,
};