-# -*- coding: utf-8 -*-
-# This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
-# Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
-#
-import random
-import time
-from base64 import urlsafe_b64encode
-
-from django.core.files.uploadedfile import UploadedFile
-from django.utils.hashcompat import sha_constructor
-from django.conf import settings
-
-
-# Use the system (hardware-based) random number generator if it exists.
-if hasattr(random, 'SystemRandom'):
- randrange = random.SystemRandom().randrange
-else:
- randrange = random.randrange
-MAX_SESSION_KEY = 18446744073709551616L # 2 << 63
-
-
-def get_random_hash(seed):
- sha_digest = sha_constructor('%s%s%s%s' %
- (randrange(0, MAX_SESSION_KEY), time.time(), unicode(seed).encode('utf-8', 'replace'),
- settings.SECRET_KEY)).digest()
- return urlsafe_b64encode(sha_digest).replace('=', '').replace('_', '-').lower()
-
-
-def split_tags(tags):
- result = {}
- for tag in tags:
- result.setdefault(tag.category, []).append(tag)
- return result
-
-
-class ExistingFile(UploadedFile):
-
- def __init__(self, path, *args, **kwargs):
- self.path = path
- return super(ExistingFile, self).__init__(*args, **kwargs)
-
- def temporary_file_path(self):
- return self.path
-
- def close(self):
- pass