class Doorkeeper::OAuth::TokenIntrospection

def error_response
  return if @error.blank?
  if @error == :invalid_token
    OAuth::InvalidTokenResponse.from_access_token(authorized_token)
  elsif @error == :invalid_request
    OAuth::InvalidRequestResponse.from_request(self)
  else
    OAuth::ErrorResponse.new(name: @error)
  end
end