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oldguan / Google Direct Links

// ==UserScript==

// @name         Google Direct Links
// @namespace    https://openuserjs.org/users/oldguan
// @version      1.0.1
// @description  Skip redirection URL on Google search results.

// @match        *www.google.com/*
// @match        *mail.google.com/*
// @icon         https://www.google.com/s2/favicons?domain=google.com

// @updateURL    https://openuserjs.org/meta/oldguan/Google_Direct_Links.meta.js
// @downloadURL  https://openuserjs.org/install/oldguan/Google_Direct_Links.user.js

// @fork         https://github.com/dangoakachan/Remove-Google-Redirection

// @license      MIT
// @copyright 2022, oldguan (https://openuserjs.org/users/oldguan)

// ==/UserScript==
 
(function (window) {
    "use strict";

    /*
     * Inject the function into current document and run it
     */
    function injectFunction(func) {
        var ele = document.createElement('script');
      　var s = document.getElementsByTagName('script')[0];

        ele.type = 'text/javascript';
        ele.textContent = '(' + func + ')();';

        s?.parentNode?.insertBefore(ele, s);
    }

    /*
     * Disable the url rewrite function
     */
    function disableURLRewrite() {
        function inject_init() {
            /* Define the url rewrite function */
            Object.defineProperty(window, 'rwt', {
                value: function() { return true; },
                writable: false, // set the property to read-only
                configurable: false
            });
        }

        injectFunction(inject_init);
    }

    /*
     * Clean the link, no track and no url redirection
     */
    function cleanTheLink(a) {
        if (a?.dataset?.cleaned == 1) { // Already cleaned
            return;
        }

        /* Set clean flag */
        var need_clean = false;

        /* Find the original url */
        var result = /\/(?:url|imgres).*[&?](?:url|q|imgurl)=([^&]+)/i.exec(a.href);

        if (result) {
            need_clean = true;
            a.href = result[1]; // Restore url to original one
        }

        /* Remove the onmousedown attribute if found */
        var val = a.getAttribute('onmousedown') || '';

        if (val.indexOf('return rwt(') != -1) {
            need_clean = true;
            a.removeAttribute('onmousedown');
        }

        /* FIXME: check the link class name */
        var cls = a.className || '';

        if (cls.indexOf('irc_') != -1) need_clean = true;

        /*
         * Remove all event listener added to this link
         */ 
        if (need_clean) {
            var clone = a.cloneNode(true);
            a.parentNode.replaceChild(clone, a);
            clone.dataset.cleaned = 1;
        }
    }

    /*
     * The main entry
     */
    function main()
    {
        disableURLRewrite();

        document.addEventListener('mouseover', function (event) {
            var a = event.target, depth = 1;

            /* Found the target link, and try to clean it */
            while (a && a.tagName != 'A' && depth-- > 0){
                a = a.parentNode;
            }

            if (a && a.tagName == 'A'){
                cleanTheLink(a);
            }
        }, true);
    }

    main();
})(window);