Google search Link Checker

Adds 'No Access' to Google search links if inaccessible
当前为 2025-06-18 提交的版本，查看最新版本。
换行
// ==UserScript==
// @name         Google search Link Checker
// @namespace    http://tampermonkey.net/
// @version      1.0
// @description  Adds 'No Access' to Google search links if inaccessible
// @author       Bui Quoc Dung
// @match        https://www.google.com/search*
// @grant        GM_xmlhttpRequest
// @connect      *
// ==/UserScript==

(function () {
    'use strict';

    async function checkLinkStatus(url) {
        return new Promise((resolve) => {
            GM_xmlhttpRequest({
                method: "HEAD",
                url,
                timeout: 5000,
                onload: res => {
                    const ok = (res.status >= 200 && res.status < 400) || res.status === 0 || res.status === 403 || res.status === 405;
                    resolve(ok);
                },
                onerror: () => resolve(false),
                ontimeout: () => resolve(false)
            });
        });
    }

    function addInaccessibleTag(link) {
        if (!link || link.dataset.statusChecked) return;
        link.dataset.statusChecked = 'true';
        const url = link.href;
        if (!url || url.startsWith('javascript:') || url.startsWith('#')) return;

        checkLinkStatus(url).then(accessible => {
            if (!accessible) {
                if (link.querySelector('span.no-access-tag')) return;
                const tag = document.createElement('span');
                tag.textContent = ' No Access';
                tag.className = 'no-access-tag';
                tag.style.color = 'green';
                tag.style.fontSize = '0.8em';
                tag.style.marginLeft = '4px';

                const h3 = link.querySelector('h3');
                (h3 || link).appendChild(tag);
            }
        });
    }

    let scanTimeoutId = null;
    function scanLinksDebounced() {
        clearTimeout(scanTimeoutId);
        scanTimeoutId = setTimeout(() => {
            document.querySelectorAll('span.V9tjod a.zReHs').forEach(addInaccessibleTag);
            document.querySelectorAll('div.g a:has(h3), div.MjjYud a:has(h3), div.hlcw0c a:has(h3)').forEach(addInaccessibleTag);
        }, 300);
    }

    const observer = new MutationObserver(mutations => {
        for (const m of mutations) {
            for (const node of m.addedNodes) {
                if (node.nodeType === 1 &&
                    (node.querySelector('span.V9tjod a.zReHs, div.g a:has(h3), div.MjjYud a:has(h3), div.hlcw0c a:has(h3)') ||
                     node.matches('.g, .MjjYud, .hlcw0c'))) {
                    scanLinksDebounced();
                    return;
                }
            }
        }
    });

    const container = document.getElementById('center_col') || document.getElementById('rcnt') || document.body;
    observer.observe(container, { childList: true, subtree: true });

    if (document.readyState === 'loading') {
        window.addEventListener('DOMContentLoaded', () => setTimeout(scanLinksDebounced, 1000));
    } else {
        setTimeout(scanLinksDebounced, 1000);
    }
})();
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