webauthn-json VS java-webauthn-server

First, we will add the necessary NPM packages. We will use @github/webauthn-json as a nice wrapper for the WebAuthn API and @rails/request.js for easier requests to the backend (with built-in Turbo Stream support).

java-webauthn-server: A library from Yubico that supports many attestation format. But it is not 100% FIDO2 conformant.

I have some example code here: https://github.com/Yubico/java-webauthn-server/blob/main/webauthn-server-demo/src/main/webapp/index.html

If you need them to use one of a set of trusted authenticator models, then you need attestation. Your authentication servers will need to compile a set of acceptable attestation root certificates, and require that all enrolled credentials have a valid attestation statement that correctly chains to one of those trusted root certificates. Yubico provides libraries to help with this for Python and Java You can provide the devices or let users self-source one on the list of acceptable models. Your webapp will also need to guide users to use the correct authenticator if they attempt to use an untrusted one. Note that this will only let you verify an authenticator model, not individual YubiKeys (i.e., not on serial number level).