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, slug):
  48     # TODO: cache
  49     try:
  50         carousel = Carousel.objects.get(slug=slug)
  51     except Carousel.DoesNotExist:
  52         # TODO: add sanity check for install.
  53         carousel = Carousel.objects.create(slug=slug)
  54     banners = [
  55             item.get_banner()
  56             for item in carousel.carouselitem_set.all().select_related('banner')
  57             ]
  58
  59     request = context['request']
  60     if 'banner' in request.GET:
  61         try:
  62             banner_id = int(request.GET['banner'])
  63         except (TypeError, ValueError):
  64             pass
  65         else:
  66             try:
  67                 index = [b.pk for b in banners].index(banner_id)
  68             except ValueError:
  69                 if request.user.is_staff:
  70                     # Staff is allowed to preview any banner.
  71                     try:
  72                         banners.insert(0, Cite.objects.get(pk=banner_id))
  73                     except Cite.DoesNotExist:
  74                         pass
  75             else:
  76                 # Put selected banner to front.
  77                 banners = [banners[index]] + banners[:index] + banners[index+1:]
  78
  79     return {
  80         'carousel': carousel,
  81         'banners': banners,
  82     }
  83
  84
  85 @register.inclusion_tag('social/embed_video.html')
  86 def embed_video(url):
  87     m = re.match(r'https://www.youtube.com/watch\?v=([^&;]+)', url)
  88     return {
  89         'youtube_id': m.group(1) if m else None,
  90     }