Lists all Let's Encrypt certificates with their current expiry dates

letsencrypt-cert-expiry-list.js

#!/usr/bin/env node
/// needs root, works with node v7+
module.exports = (async () => { 'use strict';
                               
const CERT_DIR = '/etc/letsencrypt/live';

const FS = require('fs'), ChildProcess = require('child_process');

let names; try { names = FS.readdirSync(CERT_DIR); }
catch (error) { throw new Error('Could not access cert folder, please retry with root peermission'); }

const domains = (await Promise.all(names.map(domain =>
    run('openssl x509 -enddate -noout -in "'+ CERT_DIR +'/'+ domain +'/cert.pem"').then(output => ({
        name: domain, reverse: domain.split('.').reverse().join('.'),
        output: output.replace(/^notAfter=|\s*$/g, ''),
    }))
))).sort((a, b) => a.reverse > b.reverse ? 1 : -1);

const maxLength = Math.max(...domains.map(_=>_.name.length));

domains.forEach(({ name, output, reverse, }) => console.log(
    ' '.repeat(maxLength - name.length) + name +': ',
    new Date(output).toISOString().replace('T', ' ').replace('.000Z', ' UTC')
));

return domains;

function run(command) { return new Promise((resolve, reject) => {
    ChildProcess.exec(command, (error, stdout, stderr) => error ? reject(Object.assign(error, { stderr, stdout, })) : resolve(stdout));
}); }

})().catch(error => { console.error(error); process.exit(1); });