module ActionController::RequestForgeryProtection::ClassMethods

def storage_strategy(name)
  case name
  when :session
    SessionStore.new
  when :cookie
    CookieStore.new(:csrf_token)
  else
    return name if is_storage_strategy?(name)
    raise ArgumentError, "Invalid CSRF token storage strategy, use :session, :cookie, or a custom CSRF token storage class."
  end
end