Store the first-touch UTM parameters to cookie of main domain

storeFirstTouchUTMParamsToCookie.js

var SelectomCookieToUTM = function() {

    /* Cookie based on https://developers.livechatinc.com/blog/setting-cookies-to-subdomains-in-javascript/ */
    var Cookie=function(){var a={set:function(b,d,e){var f,g,h,j,k;e?(h=new Date,h.setTime(h.getTime()+1e3*(60*(60*(24*e)))),j="; expires="+h.toGMTString()):j="",k=location.host,1===k.split(".").length?document.cookie=b+"="+d+j+"; path=/":(g=k.split("."),g.shift(),f="."+g.join("."),document.cookie=b+"="+d+j+"; path=/; domain="+f,(null==a.get(b)||a.get(b)!=d)&&(f="."+k,document.cookie=b+"="+d+j+"; path=/; domain="+f))},get:function(b){for(var g,d=b+"=",e=document.cookie.split(";"),f=0;f<e.length;f++){for(g=e[f];" "==g.charAt(0);)g=g.substring(1,g.length);if(0==g.indexOf(d))return g.substring(d.length,g.length)}return null},erase:function(b){a.set(b,"",-1)}};return a}();

    var s = {
        Cookie: Cookie,
        getParameterByName: function(name) {
            var match = RegExp('[?&]' + name + '=([^&]*)').exec(window.location.search);
            return match && decodeURIComponent(match[1].replace(/\+/g, ' '));
        },
        setToCookie: function (utm_param, utm_val) {
          if (utm_val != "" && utm_val && s.Cookie.get('_selectom_utm_' + utm_param) == null) {
             s.Cookie.set('_selectom_utm_'+utm_param, utm_val, 30);
          } 
        },
        execute: function() {
          s.setToCookie('source', getParameterByName('utm_source'));
          s.setToCookie('medium', getParameterByName('utm_medium'));
          s.setToCookie('campaign', getParameterByName('utm_campaign'));
          s.setToCookie('content', getParameterByName('utm_content'));
          s.setToCookie('term', getParameterByName('utm_term'));
      }
    };

    return s;

}();
SelectomCookieToUTM.execute();