Basic auth for certain RefineryCMS page.

application.rb

module MyApplication
  class Application < Rails::Application
    config.to_prepare do
      Refinery::PagesController.class_eval do
        before_filter :require_auth, :only => [:show]
        def require_auth
          if params[:id] == 'secret-page'
            authenticate_or_request_with_http_basic('Administration') do |username, password|
              username == 'admin' && password == 'password'
            end
          end
        end
        protected :require_auth
      end
    end
  end
end