Auto-select Single Google Account のソースコード

Auto-select Single Google Account

Auto-clicks the only account, or the sun-asterisk account when app_domain contains sun-asterisk
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// ==UserScript==
// @name         Auto-select Single Google Account
// @namespace    https://accounts.google.com
// @version      1.1
// @description  Auto-clicks the only account, or the sun-asterisk account when app_domain contains sun-asterisk
// @match        https://accounts.google.com/o/oauth2/auth*
// @match        https://accounts.google.com/v3/signin/accountchooser*
// @run-at       document-end
// @license MIT
// ==/UserScript==

(function () {
    'use strict';

    const SUN_MARKER = 'sun-asterisk';

    function decodeURIComponentSafe(s) {
        try {
            return decodeURIComponent(s);
        } catch {
            return s;
        }
    }

    /** True when query param app_domain contains sun-asterisk (case-insensitive). */
    function appDomainHasSunAsterisk() {
        const params = new URLSearchParams(window.location.search);
        const raw = params.get('app_domain') || '';
        const decoded = decodeURIComponentSafe(raw);
        const needle = SUN_MARKER.toLowerCase();
        return (
            raw.toLowerCase().includes(needle) ||
            decoded.toLowerCase().includes(needle)
        );
    }

    function clickIfSingleAccount() {
        const accounts = document.querySelectorAll('div[data-identifier]');
        if (accounts.length === 1) {
            console.log('✅ One Google account detected, auto-selecting...');
            accounts[0].click();
            return;
        }
        if (accounts.length > 1 && appDomainHasSunAsterisk()) {
            const needle = SUN_MARKER.toLowerCase();
            const match = [...accounts].find((el) => {
                const id = (el.getAttribute('data-identifier') || '').toLowerCase();
                return id.includes(needle);
            });
            if (match) {
                console.log('✅ Multiple accounts; app_domain has sun-asterisk — selecting matching account.');
                match.click();
                return;
            }
            console.log('ℹ️ Multiple accounts and app_domain has sun-asterisk, but no account email contains sun-asterisk.');
            return;
        }
        console.log(`ℹ️ ${accounts.length} Google accounts detected — skipping auto-click.`);
    }

    // Handle dynamically loaded content
    const observer = new MutationObserver((_, obs) => {
        if (document.querySelectorAll('div[data-identifier]').length > 0) {
            clickIfSingleAccount();
            obs.disconnect();
        }
    });

    observer.observe(document.body, { childList: true, subtree: true });

    // Fallback (in case MutationObserver misses it)
    setTimeout(clickIfSingleAccount, 1000);
})();