GSA/i14y

class MaxBytes < Grape::Validations::Validators::Base
  def validate_param!(attr_name, params)
    if params[attr_name].bytesize > max_bytes
      raise Grape::Exceptions::Validation.new(
        params: [@scope.full_name(attr_name)],
        message: "cannot be more than #{max_bytes} bytes long"
      )
    end
  end

  private

  def max_bytes
    @max_bytes ||= [@option].flatten.first
  end
end