class ActionDispatch::Cookies::SignedKeyRotatingCookieJar

def commit(name, options)
  options[:value] = @verifier.generate(serialize(options[:value]), **cookie_metadata(name, options))
  raise CookieOverflow if options[:value].bytesize > MAX_COOKIE_SIZE
end

def initialize(parent_jar)
  super
  secret = request.key_generator.generate_key(request.signed_cookie_salt)
  @verifier = ActiveSupport::MessageVerifier.new(secret, digest: signed_cookie_digest, serializer: SERIALIZER)
  request.cookies_rotations.signed.each do |(*secrets)|
    options = secrets.extract_options!
    @verifier.rotate(*secrets, serializer: SERIALIZER, **options)
  end
end

def parse(name, signed_message, purpose: nil)
  deserialize(name) do |rotate|
    @verifier.verified(signed_message, on_rotation: rotate, purpose: purpose)
  end
end