src/social/templatetags/social_tags.py

   1 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   3 #
   4 import re
   5 from django import template
   6 from django.utils.functional import lazy
   7 from django.utils.cache import add_never_cache_headers
   8 from catalogue.models import Book
   9 from social.utils import likes, get_or_choose_cite
  10 from ..models import Carousel, Cite
  11
  12 register = template.Library()
  13
  14
  15 @register.simple_tag(takes_context=True)
  16 def likes_book(context, book):
  17     request = context['request']
  18     return likes(request.user, book, request)
  19
  20
  21 @register.simple_tag(takes_context=True)
  22 def choose_cite(context, book_id=None, tag_ids=None):
  23     request = context['request']
  24     return get_or_choose_cite(request, book_id, tag_ids)
  25
  26
  27 @register.simple_tag(takes_context=True)
  28 def book_shelf_tags(context, book_id):
  29     request = context['request']
  30     if not request.user.is_authenticated:
  31         return ''
  32     book = Book.objects.get(pk=book_id)
  33     lks = likes(request.user, book, request)
  34
  35     def get_value():
  36         if not lks:
  37             return ''
  38         tags = book.tags.filter(category='set', user=request.user).exclude(name='')
  39         if not tags:
  40             return ''
  41         ctx = {'tags': tags}
  42         return template.loader.render_to_string('social/shelf_tags.html', ctx)
  43     return lazy(get_value, str)()
  44
  45
  46 @register.inclusion_tag('social/carousel.html', takes_context=True)
  47 def carousel(context, placement):
  48     carousel = Carousel.get(placement)
  49     banners = [
  50             item.get_banner()
  51             for item in carousel.carouselitem_set.all().select_related('banner')
  52             ]
  53
  54     request = context['request']
  55     if 'banner' in request.GET:
  56         try:
  57             banner_id = int(request.GET['banner'])
  58         except (TypeError, ValueError):
  59             pass
  60         else:
  61             try:
  62                 index = [b.pk for b in banners].index(banner_id)
  63             except ValueError:
  64                 if request.user.is_staff:
  65                     # Staff is allowed to preview any banner.
  66                     try:
  67                         banners.insert(0, Cite.objects.get(pk=banner_id))
  68                     except Cite.DoesNotExist:
  69                         pass
  70             else:
  71                 # Put selected banner to front.
  72                 banners = [banners[index]] + banners[:index] + banners[index+1:]
  73
  74     return {
  75         'carousel': carousel,
  76         'banners': banners,
  77     }
  78
  79
  80 @register.inclusion_tag('social/embed_video.html')
  81 def embed_video(url):
  82     m = re.match(r'https://www.youtube.com/watch\?v=([^&;]+)', url)
  83     return {
  84         'youtube_id': m.group(1) if m else None,
  85     }