no-consent-ga.js

"use strict";

// IE support if needed
// @link https://caniuse.com/?search=math.imul
if (!Math.imul) {
  Math.imul = function (opA, opB) {
    opB |= 0; 
    var result = (opA & 0x003fffff) * opB;
    if (opA & 0xffc00000) result += (opA & 0xffc00000) * opB | 0;
    return result | 0;
  };
}

// fast hashes thanks to bryc
// @link https://stackoverflow.com/questions/7616461/generate-a-hash-from-string-in-javascript/7616484#7616484
function cyrb53(str) {
  var seed = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 0;
  var h1 = 0xdeadbeef ^ seed,
      h2 = 0x41c6ce57 ^ seed;

  for (var i = 0, ch; i < str.length; i++) {
    ch = str.charCodeAt(i);
    h1 = Math.imul(h1 ^ ch, 2654435761);
    h2 = Math.imul(h2 ^ ch, 1597334677);
  }

  h1 = Math.imul(h1 ^ h1 >>> 16, 2246822507) ^ Math.imul(h2 ^ h2 >>> 13, 3266489909);
  h2 = Math.imul(h2 ^ h2 >>> 16, 2246822507) ^ Math.imul(h1 ^ h1 >>> 13, 3266489909);
  return 4294967296 * (2097151 & h2) + (h1 >>> 0);
}

function getIP(callback) {
  var req = new XMLHttpRequest();
  req.onreadystatechange = function() {
      if (this.readyState == 4 && this.status == 200) {     
         callback(this.responseText)
      }
  };
  req.open("GET", "https://checkip.amazonaws.com/", true);
  req.send();
}

// getIP(function(clientIP) {
var clientIP = ""; // you can use {$_SERVER['REMOTE_ADDR']} in php here or use getIP with a callback function for static html
var validityInterval = Math.round(new Date() / 1000 / 3600 / 24 / 4);
var clientIDSource = clientIP + ";" + window.location.host + ";" + navigator.userAgent + ";" + navigator.language + ";" + validityInterval;
var clientIDHashed = cyrb53(clientIDSource).toString(16);

(function (i, s, o, g, r, a, m) {
  i['GoogleAnalyticsObject'] = r;
  i[r] = i[r] || function () {
    (i[r].q = i[r].q || []).push(arguments);
  }, i[r].l = 1 * new Date();
  a = s.createElement(o), m = s.getElementsByTagName(o)[0];
  a.async = 1;
  a.src = g;
  m.parentNode.insertBefore(a, m);
})(window, document, 'script', '//www.google-analytics.com/analytics.js', 'ga');

ga('create', 'YOUR-GA-TRACKING-CODE', {
  'storage': 'none',
  'clientId': clientIDHashed
});
ga('set', 'anonymizeIp', true);
ga('send', 'pageview');

//});
//uncomment this line if using getIP