105 lines
3.3 KiB
Python
105 lines
3.3 KiB
Python
# © 2018–2020 io mintz <io@mintz.cc>
|
||
#
|
||
# Emote Manager is free software: you can redistribute it and/or modify
|
||
# it under the terms of the GNU Affero General Public License as
|
||
# published by the Free Software Foundation, either version 3 of the
|
||
# License, or (at your option) any later version.
|
||
#
|
||
# Emote Manager is distributed in the hope that it will be useful,
|
||
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
# GNU Affero General Public License for more details.
|
||
#
|
||
# You should have received a copy of the GNU Affero General Public License
|
||
# along with Emote Manager. If not, see <https://www.gnu.org/licenses/>.
|
||
|
||
import asyncio
|
||
import collections
|
||
import enum
|
||
import posixpath
|
||
import tarfile
|
||
import typing.io
|
||
import zipfile
|
||
from typing import Iterable, Tuple, Optional
|
||
|
||
from . import errors
|
||
|
||
ArchiveInfo = collections.namedtuple('ArchiveInfo', 'filename content error')
|
||
|
||
def extract(archive: typing.io.BinaryIO, *, size_limit=None) \
|
||
-> Iterable[Tuple[str, Optional[bytes], Optional[BaseException]]]:
|
||
"""
|
||
extract a binary file-like object representing a zip or uncompressed tar archive, yielding filenames and contents.
|
||
|
||
yields ArchiveInfo objects: (filename: str, content: typing.Optional[bytes], error: )
|
||
if size_limit is not None and the size limit is exceeded, or for any other error, yield None for content
|
||
on success, error will be None
|
||
"""
|
||
|
||
try:
|
||
yield from extract_zip(archive, size_limit=size_limit)
|
||
return
|
||
except zipfile.BadZipFile:
|
||
pass
|
||
finally:
|
||
archive.seek(0)
|
||
|
||
try:
|
||
yield from extract_tar(archive, size_limit=size_limit)
|
||
except tarfile.ReadError as exc:
|
||
raise ValueError('not a valid zip or tar file') from exc
|
||
finally:
|
||
archive.seek(0)
|
||
|
||
def extract_zip(archive, *, size_limit=None):
|
||
with zipfile.ZipFile(archive) as zip:
|
||
members = [m for m in zip.infolist() if not m.is_dir()]
|
||
for member in members:
|
||
if size_limit is not None and member.file_size >= size_limit:
|
||
yield ArchiveInfo(
|
||
filename=member.filename,
|
||
content=None,
|
||
error=errors.FileTooBigError(member.file_size, size_limit))
|
||
continue
|
||
|
||
try:
|
||
content = zip.open(member).read()
|
||
except RuntimeError as exc: # why no specific exceptions smh
|
||
yield ArchiveInfo(filename=member.filename, content=None, error=exc)
|
||
else: # this else is required to avoid UnboundLocalError for some reason
|
||
yield ArchiveInfo(filename=member.filename, content=content, error=None)
|
||
|
||
def extract_tar(archive, *, size_limit=None):
|
||
with tarfile.open(fileobj=archive) as tar:
|
||
members = [f for f in tar.getmembers() if f.isfile()]
|
||
for member in members:
|
||
if size_limit is not None and member.size >= size_limit:
|
||
yield ArchiveInfo(
|
||
filename=member.name,
|
||
content=None,
|
||
error=errors.FileTooBigError(member.size, size_limit))
|
||
continue
|
||
|
||
yield ArchiveInfo(member.name, content=tar.extractfile(member).read(), error=None)
|
||
|
||
async def extract_async(archive: typing.io.BinaryIO, size_limit=None):
|
||
for x in extract(archive, size_limit=size_limit):
|
||
yield await asyncio.sleep(0, x)
|
||
|
||
def main():
|
||
import io
|
||
import sys
|
||
|
||
import humanize
|
||
|
||
arc = io.BytesIO(sys.stdin.detach().read())
|
||
for name, data, error in extract(arc):
|
||
if error is not None:
|
||
print(f'{name}: {error}')
|
||
continue
|
||
|
||
print(f'{name}: {humanize.naturalsize(len(data)):>10}')
|
||
|
||
if __name__ == '__main__':
|
||
main()
|