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calibre-web/cps/file_helper.py

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# -*- coding: utf-8 -*-
# This file is part of the Calibre-Web (https://github.com/janeczku/calibre-web)
# Copyright (C) 2023 OzzieIsaacs
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from tempfile import gettempdir
import os
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import shutil
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import zipfile
import mimetypes
from io import BytesIO
from . import logger
log = logger.create()
try:
import magic
error = None
except ImportError as e:
error = "Cannot import python-magic, checking uploaded file metadata will not work: {}".format(e)
def get_temp_dir():
tmp_dir = os.path.join(gettempdir(), 'calibre_web')
if not os.path.isdir(tmp_dir):
os.mkdir(tmp_dir)
return tmp_dir
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def del_temp_dir():
tmp_dir = os.path.join(gettempdir(), 'calibre_web')
shutil.rmtree(tmp_dir)
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def validate_mime_type(file_buffer, allowed_extensions):
if error:
log.error(error)
return False
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mime = magic.Magic(mime=True)
allowed_mimetypes = list()
for x in allowed_extensions:
try:
allowed_mimetypes.append(mimetypes.types_map["." + x])
except KeyError:
log.error("Unkown mimetype for Extension: {}".format(x))
tmp_mime_type = mime.from_buffer(file_buffer.read())
file_buffer.seek(0)
if any(mime_type in tmp_mime_type for mime_type in allowed_mimetypes):
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return True
# Some epubs show up as zip mimetypes
elif "zip" in tmp_mime_type:
try:
with zipfile.ZipFile(BytesIO(file_buffer.read()), 'r') as epub:
file_buffer.seek(0)
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if "mimetype" in epub.namelist():
return True
except:
file_buffer.seek(0)
log.error("Mimetype '{}' not found in allowed types".format(tmp_mime_type))
return False