UIImagePickerControllerで取得した画像の形式を取得する

(NS)Dataに変換する時に以下の2種類あるのでその判定用。
UIImageJPEGRepresentation
UIImagePNGRepresentation

enum ImageType: String {
    case jpg = "JPG"
    case png = "PNG"
    case gif = "GIF"
}

extension SomeViewController: UIImagePickerControllerDelegate {
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String: Any]) {
        var imageType: ImageType?
        if picker.sourceType == .camera {
            // カメラはjpg固定
            imageType = .jpg
        } else {
            // ファイルの格納先の拡張子から形式を取得する
            if let url = info[UIImagePickerControllerReferenceURL] as? URL, let component = URLComponents(url: url, resolvingAgainstBaseURL: false) {
                if let queryItems = component.queryItems {
                    for query in queryItems {
                        if let value = query.value, query.name == "ext" {
                            imageType = ImageType(rawValue: value)
                        }
                    }
                }
            }
        }

        guard let image = info[UIImagePickerControllerOriginalImage] as? UIImage else { return }

        // some action
    }
}