module Google::Cloud::Storage::Convert

def storage_class_for str
  return nil if str.nil?
  return str.map { |s| storage_class_for s } if str.is_a? Array
  { "archive" => "ARCHIVE",
    "coldline" => "COLDLINE",
    "dra" => "DURABLE_REDUCED_AVAILABILITY",
    "durable" => "DURABLE_REDUCED_AVAILABILITY",
    "durable_reduced_availability" => "DURABLE_REDUCED_AVAILABILITY",
    "multi_regional" => "MULTI_REGIONAL",
    "nearline" => "NEARLINE",
    "regional" => "REGIONAL",
    "standard" => "STANDARD" }[str.to_s.downcase] || str.to_s
end