Node tls info

tls-info.js

const http = require('http');
const tls = require('tls');
const url = require('url');

const getSslDetails = (host) => new Promise((resolve, reject) => {
    const sock = tls.connect({rejectUnauthorized: false, port: 443, host}, () => {
        const certs = sock.getPeerCertificate();
        delete certs.raw;
        resolve({
            authorized: sock.authorized,
            error: sock.authorized ? undefined : sock.authorizationError,
            certificates: certs
        });
    });

    sock.on('error', reject);
});

function send(res, status, content) {
    if (content) {
        res.writeHead(status, {'Content-Type': 'application/json'});
        res.end(JSON.stringify(content));
    }
    else {
        res.writeHead(status);
        res.end();
    }
}

http.createServer((req, res) => {
    const _url = url.parse(req.url, true);

    if (req.method !== 'GET' || !_url.query.domain)
        return send(res, 400);

    const domain = _url.query.domain;

    getSslDetails(domain)
        .then((certs) => send(res, 200, Object.assign(certs, {domain})))
        .catch((error) => {
            switch (error.code) {
                case 'ENOTFOUND':
                    return send(res, 404, {error});
                default:
                    console.error(error);
                    return send(res, 500, {error});
            }
        })

}).listen(4567);