X-Git-Url: https://git.mdrn.pl/wolnelektury.git/blobdiff_plain/dd549d9f4b46da1b7a42145f571c746f3831953e..78c155d16f5e0a16288479a4259d972fd94e6a3f:/apps/catalogue/utils.py diff --git a/apps/catalogue/utils.py b/apps/catalogue/utils.py index 0134701a6..29f40d16b 100644 --- a/apps/catalogue/utils.py +++ b/apps/catalogue/utils.py @@ -5,20 +5,22 @@ from __future__ import with_statement import random +import re import time from base64 import urlsafe_b64encode +from django.http import HttpResponse from django.core.files.uploadedfile import UploadedFile +from django.core.files.storage import DefaultStorage +from django.utils.encoding import force_unicode 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 # Use the system (hardware-based) random number generator if it exists. if hasattr(random, 'SystemRandom'): @@ -46,7 +48,7 @@ class ExistingFile(UploadedFile): def __init__(self, path, *args, **kwargs): self.path = path - return super(ExistingFile, self).__init__(*args, **kwargs) + super(ExistingFile, self).__init__(*args, **kwargs) def temporary_file_path(self): return self.path @@ -55,19 +57,6 @@ class ExistingFile(UploadedFile): 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 @@ -85,12 +74,12 @@ class LockFile(object): try: unlink(self.lockname) except OSError as oe: - if oe.errno != oe.EEXIST: + if oe.errno != EEXIST: raise oe self.lock.close() -@task +#@task def create_zip(paths, zip_slug): """ Creates a zip in MEDIA_ROOT/zip directory containing files from path. @@ -131,3 +120,140 @@ def remove_zip(zip_slug): 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(DefaultStorage().path(self.file_path)) as f: + for chunk in read_chunks(f): + self.write(chunk) + +class MultiQuerySet(object): + def __init__(self, *args, **kwargs): + self.querysets = args + self._count = None + + def count(self): + if not self._count: + self._count = sum(len(qs) for qs in self.querysets) + return self._count + + def __len__(self): + return self.count() + + def __getitem__(self, item): + try: + indices = (offset, stop, step) = item.indices(self.count()) + except AttributeError: + # it's not a slice - make it one + return self[item : item + 1][0] + items = [] + total_len = stop - offset + for qs in self.querysets: + if len(qs) < offset: + offset -= len(qs) + else: + items += list(qs[offset:stop]) + if len(items) >= total_len: + return items + else: + offset = 0 + stop = total_len - len(items) + continue + + +def truncate_html_words(s, num, end_text='...'): + """Truncates HTML to a certain number of words (not counting tags and + comments). Closes opened tags if they were correctly closed in the given + html. Takes an optional argument of what should be used to notify that the + string has been truncated, defaulting to ellipsis (...). + + Newlines in the HTML are preserved. + + This is just a version of django.utils.text.truncate_html_words with no space before the end_text. + """ + s = force_unicode(s) + length = int(num) + if length <= 0: + return u'' + html4_singlets = ('br', 'col', 'link', 'base', 'img', 'param', 'area', 'hr', 'input') + # Set up regular expressions + re_words = re.compile(r'&.*?;|<.*?>|(\w[\w-]*)', re.U) + re_tag = re.compile(r'<(/)?([^ ]+?)(?: (/)| .*?)?>') + # Count non-HTML words and keep note of open tags + pos = 0 + end_text_pos = 0 + words = 0 + open_tags = [] + while words <= length: + m = re_words.search(s, pos) + if not m: + # Checked through whole string + break + pos = m.end(0) + if m.group(1): + # It's an actual non-HTML word + words += 1 + if words == length: + end_text_pos = pos + continue + # Check for tag + tag = re_tag.match(m.group(0)) + if not tag or end_text_pos: + # Don't worry about non tags or tags after our truncate point + continue + closing_tag, tagname, self_closing = tag.groups() + tagname = tagname.lower() # Element names are always case-insensitive + if self_closing or tagname in html4_singlets: + pass + elif closing_tag: + # Check for match in open tags list + try: + i = open_tags.index(tagname) + except ValueError: + pass + else: + # SGML: An end tag closes, back to the matching start tag, all unclosed intervening start tags with omitted end tags + open_tags = open_tags[i+1:] + else: + # Add it to the start of the open tags list + open_tags.insert(0, tagname) + if words <= length: + # Don't try to close tags if we don't need to truncate + return s + out = s[:end_text_pos] + if end_text: + out += end_text + # Close any tags still open + for tag in open_tags: + out += '' % tag + # Return string + return out + + +def customizations_hash(customizations): + customizations.sort() + return hash(tuple(customizations)) + + +def get_customized_pdf_path(book, customizations): + """ + Returns a MEDIA_ROOT relative path for a customized pdf. The name will contain a hash of customization options. + """ + h = customizations_hash(customizations) + return 'book/%s/%s-custom-%s.pdf' % (book.slug, book.slug, h) + + +def clear_custom_pdf(book): + """ + Returns a list of paths to generated customized pdf of a book + """ + from waiter.utils import clear_cache + clear_cache('book/%s' % book.slug)