Application controller example for SPA timeout article

application_controller.rb

class ApplicationController < ActionController::API
  before_action :check_timeout
  def check_timeout
    @user = User.find_by(id: session[:identity])
    return render json: {errors:["A user is required."]}, status: 401 if @user.blank?
    if @user.should_session_remain_active?
      @user.set_timeout!
    else
      reset_session
      return render json: {errors:["Session timed out."]}, status: 440
    end
  end
end