getFileHashFromPath function

Future<String> getFileHashFromPath(String filePath, { String? algorithm = 'md5', })

Returns the file in the specified path as a value hashed by a specific algorithm. The default algorithm is md5. This method uses a Promise to return a valid hash value.

Implementation

Future<String> getFileHashFromPath(String filePath,
    {String? algorithm = 'md5'}) async {
  if (filePath.isEmpty) {
    throw ArgumentError('Invalid file path');
  }

  Hash hashAlgorithm;

  switch (algorithm) {
    case 'md5':
      hashAlgorithm = md5;
      break;
    case 'sha1':
      hashAlgorithm = sha1;
      break;
    case 'sha256':
      hashAlgorithm = sha256;
      break;
    case 'sha512':
      hashAlgorithm = sha512;
      break;
    default:
      throw ArgumentError('Invalid hash algorithm: $algorithm');
  }

  final File file = File(filePath);
  final Stream<List<int>> inputStream = file.openRead();

  final Digest digest = await inputStream.transform(hashAlgorithm).first;

  return digest.toString();
}