Split office and archives
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jvoisin
parent
2e9adab86a
commit
e3d817f57e
127
libmat2/archive.py
Normal file
127
libmat2/archive.py
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@ -0,0 +1,127 @@
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import zipfile
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import datetime
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import tempfile
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import os
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import logging
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import shutil
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from typing import Dict, Set, Pattern
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from . import abstract, UnknownMemberPolicy, parser_factory
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# Make pyflakes happy
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assert Set
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assert Pattern
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class ArchiveBasedAbstractParser(abstract.AbstractParser):
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""" Office files (.docx, .odt, …) are zipped files. """
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# Those are the files that have a format that _isn't_
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# supported by MAT2, but that we want to keep anyway.
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files_to_keep = set() # type: Set[str]
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# Those are the files that we _do not_ want to keep,
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# no matter if they are supported or not.
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files_to_omit = set() # type: Set[Pattern]
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# what should the parser do if it encounters an unknown file in
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# the archive?
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unknown_member_policy = UnknownMemberPolicy.ABORT # type: UnknownMemberPolicy
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def __init__(self, filename):
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super().__init__(filename)
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try: # better fail here than later
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zipfile.ZipFile(self.filename)
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except zipfile.BadZipFile:
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raise ValueError
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def _specific_cleanup(self, full_path: str) -> bool:
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""" This method can be used to apply specific treatment
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to files present in the archive."""
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# pylint: disable=unused-argument,no-self-use
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return True # pragma: no cover
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@staticmethod
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def _clean_zipinfo(zipinfo: zipfile.ZipInfo) -> zipfile.ZipInfo:
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zipinfo.create_system = 3 # Linux
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zipinfo.comment = b''
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zipinfo.date_time = (1980, 1, 1, 0, 0, 0) # this is as early as a zipfile can be
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return zipinfo
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@staticmethod
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def _get_zipinfo_meta(zipinfo: zipfile.ZipInfo) -> Dict[str, str]:
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metadata = {}
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if zipinfo.create_system == 3: # this is Linux
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pass
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elif zipinfo.create_system == 2:
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metadata['create_system'] = 'Windows'
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else:
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metadata['create_system'] = 'Weird'
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if zipinfo.comment:
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metadata['comment'] = zipinfo.comment # type: ignore
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if zipinfo.date_time != (1980, 1, 1, 0, 0, 0):
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metadata['date_time'] = str(datetime.datetime(*zipinfo.date_time))
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return metadata
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def remove_all(self) -> bool:
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# pylint: disable=too-many-branches
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with zipfile.ZipFile(self.filename) as zin,\
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zipfile.ZipFile(self.output_filename, 'w') as zout:
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temp_folder = tempfile.mkdtemp()
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abort = False
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for item in zin.infolist():
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if item.filename[-1] == '/': # `is_dir` is added in Python3.6
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continue # don't keep empty folders
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zin.extract(member=item, path=temp_folder)
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full_path = os.path.join(temp_folder, item.filename)
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if self._specific_cleanup(full_path) is False:
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logging.warning("Something went wrong during deep cleaning of %s",
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item.filename)
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abort = True
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continue
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if item.filename in self.files_to_keep:
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# those files aren't supported, but we want to add them anyway
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pass
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elif any(map(lambda r: r.search(item.filename), self.files_to_omit)):
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continue
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else:
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# supported files that we want to clean then add
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tmp_parser, mtype = parser_factory.get_parser(full_path) # type: ignore
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if not tmp_parser:
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if self.unknown_member_policy == UnknownMemberPolicy.OMIT:
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logging.warning("In file %s, omitting unknown element %s (format: %s)",
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self.filename, item.filename, mtype)
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continue
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elif self.unknown_member_policy == UnknownMemberPolicy.KEEP:
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logging.warning("In file %s, keeping unknown element %s (format: %s)",
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self.filename, item.filename, mtype)
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else:
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logging.error("In file %s, element %s's format (%s) " +
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"isn't supported",
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self.filename, item.filename, mtype)
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abort = True
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continue
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if tmp_parser:
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tmp_parser.remove_all()
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os.rename(tmp_parser.output_filename, full_path)
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zinfo = zipfile.ZipInfo(item.filename) # type: ignore
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clean_zinfo = self._clean_zipinfo(zinfo)
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with open(full_path, 'rb') as f:
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zout.writestr(clean_zinfo, f.read())
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shutil.rmtree(temp_folder)
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if abort:
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os.remove(self.output_filename)
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return False
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return True
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@ -1,15 +1,11 @@
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import os
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import re
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import shutil
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import tempfile
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import datetime
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import zipfile
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import logging
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from typing import Dict, Set, Pattern
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import xml.etree.ElementTree as ET # type: ignore
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from . import abstract, parser_factory, UnknownMemberPolicy
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from .archive import ArchiveBasedAbstractParser
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# Make pyflakes happy
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assert Set
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@ -26,118 +22,6 @@ def _parse_xml(full_path: str):
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return ET.parse(full_path), namespace_map
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class ArchiveBasedAbstractParser(abstract.AbstractParser):
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""" Office files (.docx, .odt, …) are zipped files. """
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# Those are the files that have a format that _isn't_
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# supported by MAT2, but that we want to keep anyway.
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files_to_keep = set() # type: Set[str]
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# Those are the files that we _do not_ want to keep,
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# no matter if they are supported or not.
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files_to_omit = set() # type: Set[Pattern]
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# what should the parser do if it encounters an unknown file in
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# the archive?
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unknown_member_policy = UnknownMemberPolicy.ABORT # type: UnknownMemberPolicy
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def __init__(self, filename):
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super().__init__(filename)
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try: # better fail here than later
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zipfile.ZipFile(self.filename)
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except zipfile.BadZipFile:
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raise ValueError
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def _specific_cleanup(self, full_path: str) -> bool:
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""" This method can be used to apply specific treatment
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to files present in the archive."""
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# pylint: disable=unused-argument,no-self-use
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return True # pragma: no cover
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@staticmethod
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def _clean_zipinfo(zipinfo: zipfile.ZipInfo) -> zipfile.ZipInfo:
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zipinfo.create_system = 3 # Linux
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zipinfo.comment = b''
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zipinfo.date_time = (1980, 1, 1, 0, 0, 0) # this is as early as a zipfile can be
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return zipinfo
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@staticmethod
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def _get_zipinfo_meta(zipinfo: zipfile.ZipInfo) -> Dict[str, str]:
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metadata = {}
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if zipinfo.create_system == 3: # this is Linux
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pass
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elif zipinfo.create_system == 2:
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metadata['create_system'] = 'Windows'
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else:
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metadata['create_system'] = 'Weird'
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if zipinfo.comment:
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metadata['comment'] = zipinfo.comment # type: ignore
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if zipinfo.date_time != (1980, 1, 1, 0, 0, 0):
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metadata['date_time'] = str(datetime.datetime(*zipinfo.date_time))
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return metadata
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def remove_all(self) -> bool:
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# pylint: disable=too-many-branches
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with zipfile.ZipFile(self.filename) as zin,\
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zipfile.ZipFile(self.output_filename, 'w') as zout:
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temp_folder = tempfile.mkdtemp()
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abort = False
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for item in zin.infolist():
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if item.filename[-1] == '/': # `is_dir` is added in Python3.6
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continue # don't keep empty folders
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zin.extract(member=item, path=temp_folder)
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full_path = os.path.join(temp_folder, item.filename)
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if self._specific_cleanup(full_path) is False:
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logging.warning("Something went wrong during deep cleaning of %s",
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item.filename)
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abort = True
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continue
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if item.filename in self.files_to_keep:
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# those files aren't supported, but we want to add them anyway
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pass
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elif any(map(lambda r: r.search(item.filename), self.files_to_omit)):
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continue
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else:
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# supported files that we want to clean then add
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tmp_parser, mtype = parser_factory.get_parser(full_path) # type: ignore
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if not tmp_parser:
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if self.unknown_member_policy == UnknownMemberPolicy.OMIT:
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logging.warning("In file %s, omitting unknown element %s (format: %s)",
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self.filename, item.filename, mtype)
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continue
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elif self.unknown_member_policy == UnknownMemberPolicy.KEEP:
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logging.warning("In file %s, keeping unknown element %s (format: %s)",
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self.filename, item.filename, mtype)
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else:
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logging.error("In file %s, element %s's format (%s) " +
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"isn't supported",
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self.filename, item.filename, mtype)
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abort = True
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continue
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if tmp_parser:
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tmp_parser.remove_all()
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os.rename(tmp_parser.output_filename, full_path)
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zinfo = zipfile.ZipInfo(item.filename) # type: ignore
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clean_zinfo = self._clean_zipinfo(zinfo)
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with open(full_path, 'rb') as f:
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zout.writestr(clean_zinfo, f.read())
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shutil.rmtree(temp_folder)
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if abort:
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os.remove(self.output_filename)
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return False
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return True
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class MSOfficeParser(ArchiveBasedAbstractParser):
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mimetypes = {
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'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
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