version_expiration_handler.rb

require 'date'

module Api::V1::Concerns
  module VersionExpirationHandler
    extend ActiveSupport::Concern

    included do
      before_action :check_expiration!
    end

    def api_version
      self.class.superclass.name.to_s.split('::').second
    end

    def expiration_date
      @expiration_date ||= ENV[api_version + '_EXPIRATION_DATE']
    end

    def check_expiration!
      render_error(I18n.t('version.expired'),
                   :upgrade_required) unless supported_version?
    end

    def supported_version?
      !expiration_date || Time.zone.today < Date.parse(expiration_date)
    end
  end
end