[santiagorodriguez96]

Motivation

WebAuthn Level 3 adds a hints member to both PublicKeyCredentialCreationOptions and PublicKeyCredentialRequestOptions, which lets a Relying Party guide the client's UI toward the kind of authenticator it expects. Values come from PublicKeyCredentialHint: "security-key", "client-device", "hybrid".

The gem doesn't support it, and it can't be passed through either:

WebAuthn::Credential.options_for_create(user: { id: WebAuthn.generate_user_id, name: "user" }, hints: ["client-device"])
# => ArgumentError: unknown keyword: :hints

Details

This PR adds support to PublicKeyCredential::CreationOptions and PublicKeyCredential::RequestOptions to receive hints. hints default it to nil and are included when the options are serialized to JSON.