Remove tracking elements from links
Stan na
// ==UserScript==
// @name Link Untracker
// @namespace IzzySoft
// @description Remove tracking elements from links
// @license CC BY-NC-SA
// @include *
// @exclude *phpmyadmin*
// @version 8
// @grant unsafeWindow
// ==/UserScript==
/* badp: we strip parameters starting with that. Some are taken from NetURL, see
https://github.com/Smile4ever/firefoxaddons/tree/master/Neat%20URL-webext
fb_: Facebook; ga_: Google; hmb_: HumbleBundle(?); utm_: Urchin Tracker; wt_: Webtrekk; WT.: Webtrends
*/
var badp = ['fb_','ga_','hmb_','utm_',
'ei@google.','gws_rd@google.','sei@google.','ved@google.',
'pd_rd_r@amazon.','pd_rd_w@amazon.','pd_rd_wg@amazon.','psc@amazon.',' _encoding@amazon.',
'wt_','WT.','yclid','referrer'
];
var anch = ''; /* variable to hold the "anchor part" of the URL, if any – i.e. "#anchor" */
var replace_semicolon = true; /* some sites use ";" to separate URL params;
URLSearchParams can't deal with that and messes up.
If those sites don't work with "&", either set this
to "false" or add that site on the exclude list
*/
function getRealLinkFromGoogleUrl(a) { /* adapted from https://github.com/Rob--W/dont-track-me-google at 2018-01-03 */
if ((a.hostname === location.hostname || a.hostname === 'www.google.com') &&
/^\/(local_)?url$/.test(a.pathname)) {
// Google Maps / Dito (/local_url?q=<url>)
// Mobile (/url?q=<url>)
var url = /[?&](?:q|url)=((?:https?|ftp)[%:][^&]+)/.exec(a.search);
if (url) {
return decodeURIComponent(url[1]);
}
// Help pages, e.g. safe browsing (/url?...&q=%2Fsupport%2Fanswer...)
url = /[?&](?:q|url)=((?:%2[Ff]|\/)[^&]+)/.exec(a.search);
if (url) {
return a.origin + decodeURIComponent(url[1]);
}
}
return a.href;
}
class UrlParams { /* adapted from https://stackoverflow.com/a/45516670 as the built-in URLSearchParams messes up parameters without values */
constructor(search) { /* extracts the query string by stripping the leading "?" and initializes properties */
this.qs = (search || location.search).substr(1);
this.params = {};
this.parseQuerstring();
}
parseQuerstring() { /* walks the query string and extracts the parameters as key-value-pairs */
this.qs.split('&').reduce((a, b) => {
let [key, val] = b.split('=');
a[key] = val;
return a;
}, this.params);
}
filterQuerystring(badparms) { /* eliminates all "bad parameters" (tracking parameters) from our key-value-pairs */
var keysToDelete = [];
for (var key of Object.keys(this.params)) {
for (let p of badparms) {
if (key.startsWith(p)) console.log('removing '+key+' from '+this.qs);
if (key.startsWith(p)) { keysToDelete.push(key); break; }
}
}
for(var key of keysToDelete) {
delete this.params[key];
}
}
getString() { /* concatenates all parameters and returns them as a single query string without the leading "?" */
var str = '';
for (var key of Object.keys(this.params)) {
str = str + '&' + key;
if (this.params[key] != undefined) str = str + '=' + this.params[key]; /* only add the "=value" part if the parameter has a value! */
}
return str.substring(1);
}
}
/*
var x = new UrlParams('?foo=bar&john&utm_foo=utm_bar&peter=pan&mary');
x.filterQuerystring(badp);
console.log(x.getString());
*/
for(var i = 0; i < document.links.length; i++) {
var elem = document.links[i];
if (elem.search == '') continue;
if (replace_semicolon) var purl = new UrlParams(elem.search.replace(new RegExp(';','g'),'&'));
else var purl = new UrlParams(elem.search);
purl.filterQuerystring(badp);
if (elem.href.indexOf('#') > 0) anch = '#' + elem.href.split('#')[1];
else anch = '';
elem.href = elem.href.split('?')[0] + '?' + purl.getString() + anch;
elem.href = getRealLinkFromGoogleUrl(elem);
}