braintree-web/client/request/jsonp-driver.js

A suite of tools for integrating Braintree in the browser

"use strict";

var head;
var uuid = require("@braintree/uuid");
var querystring = require("../../lib/querystring");
var timeouts = {};

function _removeScript(script) {
  if (script && script.parentNode) {
    script.parentNode.removeChild(script);
  }
}

function _createScriptTag(url, callbackName) {
  var script = document.createElement("script");
  var done = false;

  script.src = url;
  script.async = true;
  script.onerror = function () {
    window[callbackName]({ message: "error", status: 500 });
  };

  script.onload = script.onreadystatechange = function () {
    if (done) {
      return;
    }

    if (
      !this.readyState ||
      this.readyState === "loaded" ||
      this.readyState === "complete"
    ) {
      done = true;
      script.onload = script.onreadystatechange = null;
    }
  };

  return script;
}

function _cleanupGlobal(callbackName) {
  try {
    delete window[callbackName];
  } catch (_) {
    window[callbackName] = null;
  }
}

function _setupTimeout(timeout, callbackName) {
  timeouts[callbackName] = setTimeout(function () {
    timeouts[callbackName] = null;

    window[callbackName]({
      error: "timeout",
      status: -1,
    });

    window[callbackName] = function () {
      _cleanupGlobal(callbackName);
    };
  }, timeout);
}

function _setupGlobalCallback(script, callback, callbackName) {
  window[callbackName] = function (response) {
    var status = response.status || 500;
    var err = null;
    var data = null;

    delete response.status;

    if (status >= 400 || status < 200) {
      err = response;
    } else {
      data = response;
    }

    _cleanupGlobal(callbackName);
    _removeScript(script);

    clearTimeout(timeouts[callbackName]);
    callback(err, data, status);
  };
}

function request(options, callback) {
  var script;
  var callbackName = "callback_json_" + uuid().replace(/-/g, "");
  var url = options.url;
  var attrs = options.data;
  var method = options.method;
  var timeout = options.timeout;

  url = querystring.queryify(url, attrs);
  url = querystring.queryify(url, {
    _method: method,
    callback: callbackName,
  });

  script = _createScriptTag(url, callbackName);
  _setupGlobalCallback(script, callback, callbackName);
  _setupTimeout(timeout, callbackName);

  if (!head) {
    head = document.getElementsByTagName("head")[0];
  }

  head.appendChild(script);
}

module.exports = {
  request: request,
};