class ActionController::RequestForgeryProtection::CookieStore

def fetch(request)
  contents = request.cookie_jar.encrypted[@cookie_name]
  return nil if contents.nil?
  value = JSON.parse(contents)
  return nil unless value.dig("session_id", "public_id") == request.session.id_was&.public_id
  value["token"]
rescue JSON::ParserError
  nil
end