upload method Null safety

Future<List<String>> upload(
  1. List<File> images
)

로컬 이미지 파일 여러장을 카카오스토리에 업로드

Implementation

Future<List<String>> upload(List<File> images) async {
  return ApiFactory.handleApiError(() async {
    List<MultipartFile> files = await Future.wait(images.map((image) async =>
        await MultipartFile.fromFile(image.path,
            filename: image.path.split("/").last)));
    Map<String, MultipartFile> data = files.asMap().map((index, file) {
      return MapEntry("${Constants.file}_${index + 1}", file);
    });
    final response = await _dio.post(Constants.scrapImagesPath,
        data: FormData.fromMap(data));
    var urls = response.data;
    if (urls is List) return urls.map((url) => url as String).toList();
    throw KakaoClientException("Response should be an array.");
  });
}