<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def pin_assets(self, file_or_dir_path: Path) -> List[Dict[str, str]]: """ Return a dict containing the IPFS hash, file name, and size of a file. """

        if file_or_dir_path.is_dir():
            asset_data = [dummy_ipfs_pin(path) for path in file_or_dir_path.glob("*")]
        elif file_or_dir_path.is_file():
            asset_data = [dummy_ipfs_pin(file_or_dir_path)]
        else:
            raise FileNotFoundError(
                f"{file_or_dir_path} is not a valid file or directory path."
            )
        return asset_data