downloadMedia method

Future<BytesBuilder> downloadMedia(PixabayMedia media, String res, [ Function? callback ])

Common function to download media from pixabay cdn remember pixabay.com does not prefer hotlinking

Implementation

Future<BytesBuilder> downloadMedia(PixabayMedia media, String res,
    [Function? callback]) async {
  var completer = Completer<BytesBuilder>();

  HttpClient httpClient = HttpClient();
  String downloadUrl = media.getDownloadLink(res: res)!;

  print("Downloading $downloadUrl");
  HttpClientRequest request = await httpClient.getUrl(Uri.parse(downloadUrl));
  HttpClientResponse response = await request.close();
  // Process the response.
  if (response.statusCode == 200) {
    // response: OK
    int fileSize = response.contentLength;
    int downloaded = 0;

    // store on file system?
    // String dir = (await getApplicationDocumentsDirectory()).path;
    //response.pipe(File('$dir/${image.getId()}.jpg').openWrite());

    var contents = BytesBuilder();

    _downloadStreamSub = response.listen((List<int> data) {
      downloaded += data.length;
      contents.add(data);
      // handle data
      double progress = downloaded / fileSize;

      if (callback != null) callback(progress);
      progressStreamController.add(progress);
    }, onDone: () {
      _downloadStreamSub = null;
      progressStreamController = StreamController.broadcast(onCancel: () {
        _downloadStreamSub?.cancel();
      });
      completer.complete(contents);
    });
  } else {
    // something went wrong :(
    completer.completeError("Http error: ${response.statusCode}");
    print("Http error: ${response.statusCode}");
  }

  return completer.future;
}