toJsonForProtocol method
Returns a JSON structure of the model, optimized for Protocol communication.
Implementation
@override
Map<String, dynamic> toJsonForProtocol() {
  return {
    if (id != null) 'id': id,
    'storageId': storageId,
    'path': path,
    'expiration': expiration.toJson(),
    'authKey': authKey,
  };
}