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import functools
import json
import logging
import os
import shutil
import subprocess
from typing import Union, Set, Dict
from . import abstract
from . import bubblewrap
class ExiftoolParser(abstract.AbstractParser):
""" Exiftool is often the easiest way to get all the metadata
from a import file, hence why several parsers are re-using its `get_meta`
method.
"""
meta_allowlist = set() # type: Set[str]
def get_meta(self) -> Dict[str, Union[str, Dict]]:
try:
if self.sandbox:
out = bubblewrap.run([_get_exiftool_path(), '-json',
self.filename],
input_filename=self.filename,
check=True, stdout=subprocess.PIPE).stdout
else:
out = subprocess.run([_get_exiftool_path(), '-json',
self.filename],
check=True, stdout=subprocess.PIPE).stdout
except subprocess.CalledProcessError: # pragma: no cover
raise ValueError
meta = json.loads(out.decode('utf-8'))[0]
for key in self.meta_allowlist:
meta.pop(key, None)
return meta
def _lightweight_cleanup(self) -> bool:
if os.path.exists(self.output_filename):
try: # exiftool can't force output to existing files
os.remove(self.output_filename)
except OSError as e: # pragma: no cover
logging.error("The output file %s is already existing and \
can't be overwritten: %s.", self.filename, e)
return False
# Note: '-All=' must be followed by a known exiftool option.
# Also, '-CommonIFD0' is needed for .tiff files
cmd = [_get_exiftool_path(),
'-all=', # remove metadata
'-adobe=', # remove adobe-specific metadata
'-exif:all=', # remove all exif metadata
'-Time:All=', # remove all timestamps
'-quiet', # don't show useless logs
'-CommonIFD0=', # remove IFD0 metadata
'-o', self.output_filename,
self.filename]
try:
if self.sandbox:
bubblewrap.run(cmd, check=True,
input_filename=self.filename,
output_filename=self.output_filename)
else:
subprocess.run(cmd, check=True)
except subprocess.CalledProcessError as e: # pragma: no cover
logging.error("Something went wrong during the processing of %s: %s", self.filename, e)
return False
return True
@functools.lru_cache(maxsize=None)
def _get_exiftool_path() -> str: # pragma: no cover
which_path = shutil.which('exiftool')
if which_path:
return which_path
# Exiftool on Arch Linux has a weird path
if os.access('/usr/bin/vendor_perl/exiftool', os.X_OK):
return '/usr/bin/vendor_perl/exiftool'
raise RuntimeError("Unable to find exiftool")
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