registrations_controller.rb

registrations_controller.rb

class RegistrationsController < ApplicationController
  def create
    user = User.new(username: params[:registration][:username])

    create_options = WebAuthn::Credential.options_for_create(
      user: {
        name: params[:registration][:username],
        id: user.webauthn_id
      }
    )

    if user.valid?
      session[:current_registration] = { challenge: create_options.challenge, user_attributes: user.attributes }

      respond_to do |format|
        format.json { render json: create_options }
      end
    else
      respond_to do |format|
        format.json { render json: { errors: user.errors.full_messages }, status: :unprocessable_entity }
      end
    end
  end
end