62 lines
1.9 KiB
Python
62 lines
1.9 KiB
Python
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import json
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import os
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import re
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import shutil
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import subprocess
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import tempfile
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from typing import Dict, Union, Set
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from . import abstract
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# Make pyflakes happy
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assert Set
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class ExiftoolParser(abstract.AbstractParser):
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""" Exiftool is often the easiest way to get all the metadata
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from a import file, hence why several parsers are re-using its `get_meta`
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method.
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"""
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meta_whitelist = set() # type: Set[str]
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@staticmethod
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def __handle_problematic_filename(filename: str, callback) -> bytes:
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""" This method takes a filename with a problematic name,
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and safely applies it a `callback`."""
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tmpdirname = tempfile.mkdtemp()
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fname = os.path.join(tmpdirname, "temp_file")
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shutil.copy(filename, fname)
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out = callback(fname)
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shutil.rmtree(tmpdirname)
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return out
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def get_meta(self) -> Dict[str, Union[str, dict]]:
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""" There is no way to escape the leading(s) dash(es) of the current
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self.filename to prevent parameter injections, so we need to take care
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of this.
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"""
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fun = lambda f: subprocess.check_output([_get_exiftool_path(), '-json', f])
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if re.search('^[a-z0-9/]', self.filename) is None:
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out = self.__handle_problematic_filename(self.filename, fun)
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else:
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out = fun(self.filename)
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meta = json.loads(out.decode('utf-8'))[0]
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for key in self.meta_whitelist:
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meta.pop(key, None)
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return meta
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def _get_exiftool_path() -> str: # pragma: no cover
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exiftool_path = '/usr/bin/exiftool'
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if os.path.isfile(exiftool_path):
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if os.access(exiftool_path, os.X_OK):
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return exiftool_path
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# ArchLinux
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exiftool_path = '/usr/bin/vendor_perl/exiftool'
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if os.path.isfile(exiftool_path):
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if os.access(exiftool_path, os.X_OK):
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return exiftool_path
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raise RuntimeError("Unable to find exiftool")
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