# -*- 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.
+#
+from __future__ import with_statement
+
+import random
+import time
+from base64 import urlsafe_b64encode
+
+from django.http import HttpResponse, HttpResponseRedirect, Http404, HttpResponsePermanentRedirect
+from django.core.files.uploadedfile import UploadedFile
+from django.utils.hashcompat import sha_constructor
+from django.conf import settings
+from celery.task import task
+from os import mkdir, path, unlink
+from errno import EEXIST, ENOENT
+from fcntl import flock, LOCK_EX
+from zipfile import ZipFile
+
+from librarian import DocProvider
+from reporting.utils import read_chunks
+from celery.task import task
+import catalogue.models
+
+# 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.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
+
+
+class ORMDocProvider(DocProvider):
+ """Used for getting books' children."""
+
+ def __init__(self, book):
+ self.book = book
+
+ def by_slug(self, slug):
+ if slug == self.book.slug:
+ return self.book.xml_file
+ else:
+ return type(self.book).objects.get(slug=slug).xml_file
+
+
+class LockFile(object):
+ """
+ A file lock monitor class; createas an ${objname}.lock
+ file in directory dir, and locks it exclusively.
+ To be used in 'with' construct.
+ """
+ def __init__(self, dir, objname):
+ self.lockname = path.join(dir, objname + ".lock")
+
+ def __enter__(self):
+ self.lock = open(self.lockname, 'w')
+ flock(self.lock, LOCK_EX)
+
+ def __exit__(self, *err):
+ try:
+ unlink(self.lockname)
+ except OSError as oe:
+ if oe.errno != oe.EEXIST:
+ raise oe
+ self.lock.close()
+
+
+@task
+def create_zip(paths, zip_slug):
+ """
+ Creates a zip in MEDIA_ROOT/zip directory containing files from path.
+ Resulting archive filename is ${zip_slug}.zip
+ Returns it's path relative to MEDIA_ROOT (no initial slash)
+ """
+ # directory to store zip files
+ zip_path = path.join(settings.MEDIA_ROOT, 'zip')
+
+ try:
+ mkdir(zip_path)
+ except OSError as oe:
+ if oe.errno != EEXIST:
+ raise oe
+ zip_filename = zip_slug + ".zip"
+
+ with LockFile(zip_path, zip_slug):
+ if not path.exists(path.join(zip_path, zip_filename)):
+ zipf = ZipFile(path.join(zip_path, zip_filename), 'w')
+ try:
+ for arcname, p in paths:
+ if arcname is None:
+ arcname = path.basename(p)
+ zipf.write(p, arcname)
+ finally:
+ zipf.close()
+
+ return 'zip/' + zip_filename
+
+
+def remove_zip(zip_slug):
+ """
+ removes the ${zip_slug}.zip file from zip store.
+ """
+ zip_file = path.join(settings.MEDIA_ROOT, 'zip', zip_slug + '.zip')
+ try:
+ unlink(zip_file)
+ except OSError as oe:
+ if oe.errno != ENOENT:
+ raise oe
+
+
+class AttachmentHttpResponse(HttpResponse):
+ """Response serving a file to be downloaded.
+ """
+ def __init__ (self, file_path, file_name, mimetype):
+ super(AttachmentHttpResponse, self).__init__(mimetype=mimetype)
+ self['Content-Disposition'] = 'attachment; filename=%s' % file_name
+ self.file_path = file_path
+ self.file_name = file_name
+
+ with open(self.file_path) as f:
+ for chunk in read_chunks(f):
+ self.write(chunk)
+
+@task
+def create_custom_pdf(book_id, customizations, file_name):
+ book = catalogue.models.Book.objects.get(id=book_id)
+ if not path.exists(file_name):
+ book.build_pdf(customizations=customizations, file_name=file_name)
fnp / wolnelektury.git / blobdiff