Dynamic Certificates

NodeJs can create HTTPS servers with a key and certificate like:

const server = https.createServer({
  key: fs.readFileSync("key.pem"),
  cert: fs.readFileSync("cert.pem"),
});

But there’s no easy way to deal with multiple or dynamic domains.

So this project is a simple library that can make the server use different certificates generated on the fly based on the hostname. It uses a tiny LRU cache to store the certificates.

const dynCert = new DynamicCertificate({
  pubKey,
  privKey,
});
const server = https.createServer({
  SNICallback: dynCert.sniCallback,
});

It can also be used as a standalone library to generate certificates for a given domain:

const certificate = dynCert.createCertificate("example.com");