user_authentications_controller.rb

class UserAuthenticationsController < AuthenticatedController
  def create
    if authenticate
      enroll_promotions
      redirect_to return_path
    else
      redirect_to back_path, error: authentication_error_message
    end
  end
  
  private
    def authenticate
      if user_authentication.authenticate!(sso_session).success?
        self.current_token = user_authentication.authenticated_user_token
      end
    end

    def enroll_promotions
      if user_authentication.promo_applicable?
        user_authentication.enroll! promo_id
        flash[:success] = I18n.t("promotions.confirmation_message")
      end     
    end
    
    def authentication_error_message
      I18n.t("user_authentication.not_allowed") if user_authentication.not_allowed?
    end
end