detox t.umblr.com link on tumblr.com for UserScript

tumblock.user.js

// ==UserScript==
// @name        t.um block (googlish)
// @namespace   http://noromanba.flavors.me
// @description Hide t.umblr.com link on tumblr.com as Google does in its search result pages
// @match       http://*.tumblr.com/*
// @match       https://*.tumblr.com/*
// @grant       none
// @noframes
// @run-at      document-end
// @version     2016.2.13.0
// @homepage    https://gist.github.com/vzvu3k6k/d58e066ccf9c86c6702d
// @downloadURL https://gist.github.com/vzvu3k6k/d58e066ccf9c86c6702d/raw/tumblock.user.js
// @license     CC0 Univ PD https://creativecommons.org/publicdomain/zero/1.0/legalcode
// @author      noromanba   http://noromanba.flavors.me
// @author      vzvu3k6k
// @icon        https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/WHMIS_Class_D-2.svg/32px-WHMIS_Class_D-2.svg.png
// @icon64      https://upload.wikimedia.org/wikipedia/commons/thumb/3/38/WHMIS_Class_D-2.svg/64px-WHMIS_Class_D-2.svg.png
// ==/UserScript==

// Icon (PD by Silsor/Health Canada)
// https://commons.wikimedia.org/wiki/File%3AWHMIS_Class_D-2.svg

// Originally written by noromanba
// - Blog        - http://ptech.g.hatena.ne.jp/noromanba/20160208/1454965267
// - Hatena::Let - http://let.hatelabo.jp/noromanba/let/hLHU2KbCtZgI
// - Devel       - https://gist.github.com/noromanba/76a3d7791cf6eaf1c94c

// c.f.
// https://stackoverflow.com/questions/35023389/tumblr-injecting-new-code-into-my-links

// e.g.
// http://yahoo.tumblr.com
(() => {
    'use strict';

    // can't catch events on the bubbling phase
    window.addEventListener('click', event => {
        if (event.target.dataset.tumblockRedirectUrl) {
            event.target.href = event.target.dataset.tumblockRedirectUrl;
        }
    }, true);

    const detox = (ctx) => {
        if (!ctx.querySelectorAll) return;

        Array.from(ctx.querySelectorAll([
            'a[href^="http://t.umblr.com/redirect?z="]',
            'area[href^="http://t.umblr.com/redirect?z="]'
            //'[src^="http://t.umblr.com/redirect?z="]'
        ]), link => {
            // redirector syntax;
            // http://t.umblr.com/redirect?z=<ENCODED_URL>&t=<66_DIGIT_HASH>%3D%3D
            link.dataset.tumblockRedirectUrl = link.href;
            link.href = link.searchParams.get('z');
        });
    };
    detox(document.body);

    new MutationObserver(records => {
        records.forEach(record => {
            detox(record.target);
        });
    }).observe(document.body, { childList: true, subtree: true });
})();


// DBG
/*
Array.from(document.querySelectorAll([
    '[href^="http://t.umblr.com/redirect?z="]',
    '[src^="http://t.umblr.com/redirect?z="]'
]), link => link.tagName ).filter((val, idx, ary) => {
    return ary.indexOf(val) === idx;
});
*/