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