class Base64Validator < ActiveModel::EachValidator

  def validate_each(record, attribute, value)
    unless value =~ /^(?:[A-Za-z0-9+$]{4})*(?:[A-Za-z0-9+$]{2}==|[A-Za-z0-9+$]{3}=|[A-Za-z0-9+$]{4})$/
      record.errors[attribute] << (options[:message] || I18n.t('errors.messages.base64'))
    end
  end

end