@mozmeao/dnt-helper
Version:
A helper that returns true or false based on whether doNotTrack is enabled on the browser.
108 lines (97 loc) • 4.35 kB
JavaScript
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/***/ (function(module) {
/*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/.
*/
/**
* Returns true or false based on whether doNotTrack is enabled. It also takes into account the
* anomalies, such as !bugzilla 887703, which effect versions of Fx 31 and lower. It also handles
* IE versions on Windows 7, 8 and 8.1, where the DNT implementation does not honor the spec.
* @see https://bugzilla.mozilla.org/show_bug.cgi?id=1217896 for more details
* @params {string} [dnt] - An optional mock doNotTrack string to ease unit testing.
* @params {string} [ua] - An optional mock userAgent string to ease unit testing.
* @returns {boolean} true if enabled else false
*/
var dntHelper = function dntHelper(dnt, ua) {
'use strict'; // for old version of IE we need to use the msDoNotTrack property of navigator
// on newer versions, and newer platforms, this is doNotTrack but, on the window object
// Safari also exposes the property on the window object.
var dntStatus = dnt || navigator.doNotTrack || window.doNotTrack || navigator.msDoNotTrack;
var userAgent = ua || navigator.userAgent; // List of Windows versions known to not implement DNT according to the standard.
var anomalousWinVersions = ['Windows NT 6.1', 'Windows NT 6.2', 'Windows NT 6.3'];
var fxMatch = userAgent.match(/Firefox\/(\d+)/);
var ieRegEx = /MSIE|Trident/i;
var isIE = ieRegEx.test(userAgent); // Matches from Windows up to the first occurance of ; un-greedily
// http://www.regexr.com/3c2el
var platform = userAgent.match(/Windows.+?(?=;)/g); // With old versions of IE, DNT did not exist so we simply return false;
if (isIE && typeof Array.prototype.indexOf !== 'function') {
return false;
} else if (fxMatch && parseInt(fxMatch[1], 10) < 32) {
// Can't say for sure if it is 1 or 0, due to Fx bug 887703
dntStatus = 'Unspecified';
} else if (isIE && platform && anomalousWinVersions.indexOf(platform.toString()) !== -1) {
// default is on, which does not honor the specification
dntStatus = 'Unspecified';
} else {
// sets dntStatus to Disabled or Enabled based on the value returned by the browser.
// If dntStatus is undefined, it will be set to Unspecified
dntStatus = {
0: 'Disabled',
1: 'Enabled'
}[dntStatus] || 'Unspecified';
}
return dntStatus === 'Enabled' ? true : false;
};
module.exports = dntHelper;
/***/ })
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