- New auth module verifies Keycloak access tokens offline against the
realm's signing keys (issuer, RS256, typ=Bearer, allowed azp); guests
are recognised by the guest realm role
- Clients send an auth message after connecting and get on_auth or
on_auth_error; unauthenticated sockets are closed after 5 seconds and
their messages ignored; a socket can refresh its token but not switch user
- A user can be connected from several sockets; a late close of an old
socket no longer drops the new one
- Malformed messages are ignored instead of throwing
- Games store player names and guest flags and send them with the
connection info
- Legacy ?userKey= clients and /register stay available behind
LEGACY_USERKEY_AUTH; legacy keys must be UUIDs so they cannot take a
Keycloak user's kc: id
- TypeScript target raised to es2020 for async/await
