downloadFile method

Implementation

Future<File> downloadFile(String url, {String? filename}) async {
  try {
    final uri = Uri.parse(url);
    final client = HttpClient();
    final request = await client.getUrl(uri);
    final response = await request.close();

    if (response.statusCode != 200) {
      throw WalletException(
          'Failed to download file: HTTP ${response.statusCode}');
    }

    final downloadFilename = filename ?? _generateFilenameFromUrl(url);
    final outputFile = await createOutputFile(downloadFilename);

    final sink = outputFile.openWrite();
    await response.pipe(sink);
    await sink.close();
    client.close();

    return outputFile;
  } catch (e) {
    throw WalletException('Failed to download file from $url: $e');
  }
}