From d0da745aa1cc9229fc46b305dcff2de5b3bb5818 Mon Sep 17 00:00:00 2001 From: Michael Kohler Date: Wed, 8 Nov 2017 22:58:08 +0100 Subject: [PATCH] Add GTM (fixes #7) --- index.html | 20 ++++++++++++++++++++ js/dnt-helper.js | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 68 insertions(+) create mode 100644 js/dnt-helper.js diff --git a/index.html b/index.html index 6181a75..edccd0d 100644 --- a/index.html +++ b/index.html @@ -8,6 +8,26 @@ + + + + diff --git a/js/dnt-helper.js b/js/dnt-helper.js new file mode 100644 index 0000000..0a563f6 --- /dev/null +++ b/js/dnt-helper.js @@ -0,0 +1,48 @@ +/** + * The MIT License (MIT) + * Copyright (c) 2015 Schalk Neethling + * + * Returns true or false based on whether doNotTack 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} [userAgent] - An optional mock userAgent string to ease unit testing. + * @returns {boolean} true if enabled else false + */ +function _dntEnabled(dnt, userAgent) { + '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 ua = userAgent || 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 = ua.match(/Firefox\/(\d+)/); + var ieRegEx = /MSIE|Trident/i; + var isIE = ieRegEx.test(ua); + // Matches from Windows up to the first occurance of ; un-greedily + // http://www.regexr.com/3c2el + var platform = ua.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; +}