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YouTube - whitelist channels in uBlock Origin

To whitelist YouTube channels in uBlock Origin

// ==UserScript==
// @name         YouTube - whitelist channels in uBlock Origin
// @namespace    https://github.com/gorhill/uBlock
// @version      1.6.2
// @description  To whitelist YouTube channels in uBlock Origin
// @author       Raymond Hill (gorhill)
// @match        https://*.youtube.com/*
// @grant        none
// @license      http://creativecommons.org/licenses/by-sa/4.0/
// @supportURL   https://greasyfork.org/en/scripts/29632-youtube-whitelist-channels-in-ublock-origin/feedback
// ==/UserScript==

// based on https://greasyfork.org/en/scripts/22308-youtube-whitelist-channels-in-ublock-origin
// by Zalastax
// https://greasyfork.org/en/scripts/13226-youtube-whitelist-channels-in-ublock-origin
// by gorhill
// https://greasyfork.org/en/forum/discussion/8985
// by whoisthis

// First page load
//

var exposeUserInURL = function() {
    'use strict';

    // The 'Polymer' YouTube overhaul changed the relevant id's.
    // Everything works at 10/May/2017, feel free to let me know
    // if it stops working again.
    var link = document.querySelector('[id="top-row"] a[href^="/user/"]');
    if (link === null) {
        link = document.querySelector('[id="owner-name"] a[href^="/channel/"]');
        if (link === null) {
            link = document.querySelector('[id="watch7-user-header"] a[href^="/user/"]');
            if (link === null) {
                link = document.querySelector('[id="watch7-user-header"] a[href^="/channel/"]');
                if (link === null)
                    return;
    }}}
    var linkHref = link.getAttribute('href');
    var linkMatch = linkHref.match(/\/(user|channel)\/(.+)/);
    if (linkMatch === null)
        return;
    var channelId = linkMatch[2];

    // Code below need not be changed
    var newArg = channelId !== '' ? 'user=' + encodeURIComponent(channelId) : '';
    var matches = location.search.match(/(?:[?&])(user=(?:[^&]+|$))/);
    var oldArg = matches !== null ? matches[1] : '';
    if (newArg === oldArg) {
        return;
    }
    var href = location.href;
    if (oldArg === '') {
        location.replace(href + (location.search === '' ? '?' : '&') + newArg);
        return;
    }
    location.replace(href.replace(oldArg, newArg));
};

setTimeout(exposeUserInURL, 25);

// DOM modifications

var mutationHandlerTimer = null;

var mutationHandlerAsync = function() {
    'use strict';

    mutationHandlerTimer = null;
    exposeUserInURL();
};

var mutationHandler = function(mutations) {
    'use strict';

    if (mutationHandlerTimer !== null) {
        return;
    }

    for (var i = 0; i < mutations.length; i++) {
        if (mutations[i].addedNodes) {
            mutationHandlerTimer = setTimeout(mutationHandlerAsync, 25);
            break;
        }
    }
};

var observer = new MutationObserver(mutationHandler);
observer.observe(document.body, {
    childList: true,
    subtree: true
});