checkDownloaded method

Future<File?> checkDownloaded({
  1. required String filename,
  2. String? checksum,
  3. int? size,
  4. String? url,
})

Checks that the File with provided parameters is downloaded.

Implementation

Future<File?> checkDownloaded({
  required String filename,
  String? checksum,
  int? size,
  String? url,
}) async {
  final Downloading? downloading = downloads[checksum];
  if (downloading != null) {
    return downloading.file;
  }

  File? file;
  if (checksum != null) {
    final String? path = await _downloadLocal?.read(checksum);

    if (path != null) {
      file = File(path);

      if (!await file.exists() || await file.length() != size) {
        file = null;
        _downloadLocal?.delete(checksum);
      }
    }
  } else {
    file = await PlatformUtils.fileExists(filename, size: size, url: url);
  }

  if (checksum != null && file != null) {
    downloads[checksum] = Downloading.completed(
      checksum,
      filename,
      size,
      file.path,
      onDownloaded: (file) => _downloadLocal?.upsert(checksum, file.path),
    );

    _downloadLocal?.upsert(checksum, file.path);
  }

  return file;
}