Search Decode

Decodes Base64 search queries into URLs or text.
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// ==UserScript==
// @name         Search Decode
// @namespace    http://tampermonkey.net/
// @version      1.0.0
// @description  Decodes Base64 search queries into URLs or text.
// @author       bewf, KHROTU
// @match        https://www.google.com/search*
// @match        https://www.bing.com/search*
// @match        https://duckduckgo.com/*
// @match        https://search.brave.com/search*
// @grant        GM_getValue
// @grant        GM_setValue
// @grant        GM_registerMenuCommand
// @run-at       document-start
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';
    const enabled = GM_getValue('sd_enabled', true);
    const mode = GM_getValue('sd_mode', 'url_only');
    GM_registerMenuCommand(enabled ? 'Search Decode: Enabled' : 'Search Decode: Disabled', () => { GM_setValue('sd_enabled', !enabled); location.reload(); });
    GM_registerMenuCommand(mode === 'url_only' ? 'Search Decode: URL Only' : 'Search Decode: URL + Text', () => { GM_setValue('sd_mode', mode === 'url_only' ? 'all' : 'url_only'); location.reload(); });
    if (!enabled) return;
    const q = new URL(location.href).searchParams.get('q');
    if (!q) return;
    let decoded;
    try { decoded = decodeURIComponent(escape(atob(q))).trim(); } catch { return; }
    if (!decoded) return;
    const isUrl = /^(https?:\/\/|www\.|[a-zA-Z0-9-]+\.[a-zA-Z]{2,})/.test(decoded);
    if (mode === 'url_only') {
        if (isUrl) location.replace(decoded.startsWith('http') ? decoded : 'https://' + decoded);
    } else {
        if (isUrl) location.replace(decoded.startsWith('http') ? decoded : 'https://' + decoded);
        else {
            const href = location.href, encoded = encodeURIComponent(decoded);
            if (href.includes('duckduckgo.com')) location.replace('https://duckduckgo.com/?q=' + encoded);
            else if (href.includes('bing.com')) location.replace('https://www.bing.com/search?q=' + encoded);
            else if (href.includes('brave.com')) location.replace('https://search.brave.com/search?q=' + encoded);
            else location.replace('https://www.google.com/search?q=' + encoded);
        }
    }
})();