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example.dup

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  • Forked from Liberate / backupninja
    Source project has a limited visibility.
    abstract.py 1.45 KiB
    import abc
    import os
    import re
    from typing import Set, Dict, Union
    
    assert Set  # make pyflakes happy
    
    
    class AbstractParser(abc.ABC):
        """ This is the base class of every parser.
        It might yield `ValueError` on instantiation on invalid files,
        and `RuntimeError` when something went wrong in `remove_all`.
        """
        meta_list = set()  # type: Set[str]
        mimetypes = set()  # type: Set[str]
    
        def __init__(self, filename: str) -> None:
            """
            :raises ValueError: Raised upon an invalid file
            """
            if re.search('^[a-z0-9./]', filename) is None:
                # Some parsers are calling external binaries,
                # this prevents shell command injections
                filename = os.path.join('.', filename)
    
            self.filename = filename
            fname, extension = os.path.splitext(filename)
    
            # Special case for tar.gz, tar.bz2, … files
            if fname.endswith('.tar') and len(fname) > 4:
                fname, extension = fname[:-4], '.tar' + extension
    
            self.output_filename = fname + '.cleaned' + extension
            self.lightweight_cleaning = False
            self.sandbox = True
    
        @abc.abstractmethod
        def get_meta(self) -> Dict[str, Union[str, dict]]:
            """Return all the metadata of the current file"""
    
        @abc.abstractmethod
        def remove_all(self) -> bool:
            """
            Remove all the metadata of the current file
    
            :raises RuntimeError: Raised if the cleaning process went wrong.
            """