apps/catalogue/views.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 from collections import OrderedDict
   6 import re
   7 import itertools
   8
   9 from django.conf import settings
  10 from django.core.cache import get_cache
  11 from django.template import RequestContext
  12 from django.template.loader import render_to_string
  13 from django.shortcuts import render_to_response, get_object_or_404
  14 from django.http import HttpResponse, HttpResponseRedirect, Http404, HttpResponsePermanentRedirect, JsonResponse
  15 from django.core.urlresolvers import reverse
  16 from django.db.models import Q
  17 from django.contrib.auth.decorators import login_required, user_passes_test
  18 from django.utils.http import urlquote_plus
  19 from django.utils import translation
  20 from django.utils.translation import get_language, ugettext as _, ugettext_lazy
  21 from django.views.decorators.vary import vary_on_headers
  22
  23 from ajaxable.utils import AjaxableFormView
  24 from catalogue import models
  25 from catalogue import forms
  26 from catalogue.utils import split_tags, MultiQuerySet, SortedMultiQuerySet
  27 from catalogue.templatetags.catalogue_tags import tag_list, collection_list
  28 from pdcounter import models as pdcounter_models
  29 from pdcounter import views as pdcounter_views
  30 from suggest.forms import PublishingSuggestForm
  31 from picture.models import Picture, PictureArea
  32 from picture.views import picture_list_thumb
  33
  34 staff_required = user_passes_test(lambda user: user.is_staff)
  35 permanent_cache = get_cache('permanent')
  36
  37
  38 @vary_on_headers('X-Requested-With')
  39 def catalogue(request):
  40     cache_key = 'catalogue.catalogue/' + get_language()
  41     output = permanent_cache.get(cache_key)
  42
  43     if output is None:
  44         tags = models.Tag.objects.exclude(
  45             category__in=('set', 'book')).exclude(book_count=0, picture_count=0)
  46         tags = list(tags)
  47         for tag in tags:
  48             tag.count = tag.book_count + tag.picture_count
  49         categories = split_tags(tags)
  50         fragment_tags = categories.get('theme', [])
  51         collections = models.Collection.objects.all()
  52
  53         render_tag_list = lambda x: render_to_string(
  54             'catalogue/tag_list.html', tag_list(x))
  55         has_pictures = lambda x: filter(lambda y: y.picture_count > 0, x)
  56         has_books = lambda x: filter(lambda y: y.book_count > 0, x)
  57         def render_split(tags):
  58             with_books = has_books(tags)
  59             with_pictures = has_pictures(tags)
  60             ctx = {}
  61             if with_books:
  62                 ctx['books'] = render_tag_list(with_books)
  63             if with_pictures:
  64                 ctx['pictures'] = render_tag_list(with_pictures)
  65             return render_to_string('catalogue/tag_list_split.html', ctx)
  66
  67         output = {'theme': {}}
  68         output['theme'] = render_tag_list(fragment_tags)
  69         for category, tags in categories.items():
  70             if category in ('author', 'theme'):
  71                 output[category] = render_tag_list(tags)
  72             else:
  73                 output[category] = render_split(tags)
  74
  75         output['collections'] = render_to_string(
  76             'catalogue/collection_list.html', collection_list(collections))
  77         permanent_cache.set(cache_key, output)
  78     if request.is_ajax():
  79         return JsonResponse(output)
  80     else:
  81         return render_to_response('catalogue/catalogue.html', locals(),
  82             context_instance=RequestContext(request))
  83
  84
  85 def book_list(request, filter=None, get_filter=None,
  86         template_name='catalogue/book_list.html',
  87         nav_template_name='catalogue/snippets/book_list_nav.html',
  88         list_template_name='catalogue/snippets/book_list.html',
  89         cache_key='catalogue.book_list',
  90         context=None,
  91         ):
  92     """ generates a listing of all books, optionally filtered with a test function """
  93     cache_key = "%s/%s" % (cache_key, get_language())
  94     cached = permanent_cache.get(cache_key)
  95     if cached is not None:
  96         rendered_nav, rendered_book_list = cached
  97     else:
  98         if get_filter:
  99             filter = get_filter()
 100         books_by_author, orphans, books_by_parent = models.Book.book_list(filter)
 101         books_nav = OrderedDict()
 102         for tag in books_by_author:
 103             if books_by_author[tag]:
 104                 books_nav.setdefault(tag.sort_key[0], []).append(tag)
 105         rendered_nav = render_to_string(nav_template_name, locals())
 106         rendered_book_list = render_to_string(list_template_name, locals())
 107         permanent_cache.set(cache_key, (rendered_nav, rendered_book_list))
 108     return render_to_response(template_name, locals(),
 109         context_instance=RequestContext(request))
 110
 111
 112 def audiobook_list(request):
 113     return book_list(request, Q(media__type='mp3') | Q(media__type='ogg'),
 114                      template_name='catalogue/audiobook_list.html',
 115                      list_template_name='catalogue/snippets/audiobook_list.html',
 116                      cache_key='catalogue.audiobook_list')
 117
 118
 119 def daisy_list(request):
 120     return book_list(request, Q(media__type='daisy'),
 121                      template_name='catalogue/daisy_list.html',
 122                      cache_key='catalogue.daisy_list')
 123
 124
 125 def collection(request, slug):
 126     coll = get_object_or_404(models.Collection, slug=slug)
 127     if coll.kind == 'book':
 128         view = book_list
 129         tmpl = "catalogue/collection.html"
 130     elif coll.kind == 'picture':
 131         view = picture_list_thumb
 132         tmpl = "picture/collection.html"
 133     else:
 134         raise ValueError('How do I show this kind of collection? %s' % coll.kind)
 135     return view(request, get_filter=coll.get_query,
 136                      template_name=tmpl,
 137                      cache_key='catalogue.collection:%s' % coll.slug,
 138                      context={'collection': coll})
 139
 140
 141 def differentiate_tags(request, tags, ambiguous_slugs):
 142     beginning = '/'.join(tag.url_chunk for tag in tags)
 143     unparsed = '/'.join(ambiguous_slugs[1:])
 144     options = []
 145     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 146         options.append({
 147             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 148             'tags': [tag]
 149         })
 150     return render_to_response('catalogue/differentiate_tags.html',
 151                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 152                 context_instance=RequestContext(request))
 153
 154
 155 # TODO: Rewrite this hellish piece of code which tries to do everything
 156 def tagged_object_list(request, tags=''):
 157     # preliminary tests and conditions
 158     try:
 159         tags = models.Tag.get_tag_list(tags)
 160     except models.Tag.DoesNotExist:
 161         # Perhaps the user is asking about an author in Public Domain
 162         # counter (they are not represented in tags)
 163         chunks = tags.split('/')
 164         if len(chunks) == 2 and chunks[0] == 'autor':
 165             return pdcounter_views.author_detail(request, chunks[1])
 166         else:
 167             raise Http404
 168     except models.Tag.MultipleObjectsReturned, e:
 169         # Ask the user to disambiguate
 170         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 171     except models.Tag.UrlDeprecationWarning, e:
 172         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 173
 174     try:
 175         if len(tags) > settings.MAX_TAG_LIST:
 176             raise Http404
 177     except AttributeError:
 178         pass
 179
 180     if len([tag for tag in tags if tag.category == 'book']):
 181         raise Http404
 182
 183     # beginning of digestion
 184     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 185     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 186     only_shelf = shelf_is_set and len(tags) == 1
 187     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 188
 189
 190     objects = only_author = None
 191     categories = {}
 192     object_queries = []
 193
 194     if theme_is_set:
 195         shelf_tags = [tag for tag in tags if tag.category == 'set']
 196         fragment_tags = [tag for tag in tags if tag.category != 'set']
 197         fragments = models.Fragment.tagged.with_all(fragment_tags)
 198         areas = PictureArea.tagged.with_all(fragment_tags)
 199
 200         if shelf_tags:
 201             books = models.Book.tagged.with_all(shelf_tags).order_by()
 202             l_tags = models.Tag.objects.filter(category='book',
 203                 slug__in=[book.book_tag_slug() for book in books.iterator()])
 204             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 205
 206         # newtagging goes crazy if we just try:
 207         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 208         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 209
 210         related_tags = []
 211
 212         fragment_keys = [fragment.pk for fragment in fragments.iterator()]
 213         if fragment_keys:
 214             related_tags = models.Fragment.tags.usage(counts=True,
 215                                 filters={'pk__in': fragment_keys}).exclude(
 216                                 category='book')
 217             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 218             categories = split_tags(related_tags, categories)
 219
 220         object_queries.insert(0, fragments)
 221
 222         area_keys = [area.pk for area in areas.iterator()]
 223         if area_keys:
 224             related_tags = PictureArea.tags.usage(counts=True,
 225                                                          filters={'pk__in': area_keys})
 226             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 227
 228             categories = split_tags(related_tags, categories)
 229
 230         # we want the Pictures to go first
 231         object_queries.insert(0, areas)
 232         objects = MultiQuerySet(*object_queries)
 233     else:
 234         if shelf_is_set:
 235             books = models.Book.tagged.with_all(tags).order_by('sort_key_author')
 236         else:
 237             books = models.Book.tagged_top_level(tags).order_by('sort_key_author')
 238
 239         pictures = Picture.tagged.with_all(tags).order_by('sort_key_author')
 240
 241         related_counts = {}
 242         if books.count() > 0:
 243             # get related tags from `tag_counter` and `theme_counter`
 244             tags_pks = [tag.pk for tag in tags]
 245             for book in books:
 246                 for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 247                     if tag_pk in tags_pks:
 248                         continue
 249                     related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 250
 251         if pictures.count() > 0:
 252             tags_pks = [tag.pk for tag in tags]
 253             for picture in pictures:
 254                 for tag_pk, value in itertools.chain(picture.tag_counter.iteritems(), picture.theme_counter.iteritems()):
 255                     if tag_pk in tags_pks:
 256                         continue
 257                     related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 258
 259         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 260         related_tags = [tag for tag in related_tags if tag not in tags]
 261
 262         for tag in related_tags:
 263             tag.count = related_counts[tag.pk]
 264
 265         categories = split_tags(related_tags)
 266         del related_tags
 267
 268
 269         objects = SortedMultiQuerySet(pictures, books, order_by='sort_key_author')
 270
 271
 272     if not objects:
 273         only_author = len(tags) == 1 and tags[0].category == 'author'
 274         objects = models.Book.objects.none()
 275
 276     return render_to_response('catalogue/tagged_object_list.html',
 277         {
 278             'object_list': objects,
 279             'categories': categories,
 280             'only_shelf': only_shelf,
 281             'only_author': only_author,
 282             'only_my_shelf': only_my_shelf,
 283             'formats_form': forms.DownloadFormatsForm(),
 284             'tags': tags,
 285             'theme_is_set': theme_is_set,
 286         },
 287         context_instance=RequestContext(request))
 288
 289
 290 def book_fragments(request, slug, theme_slug):
 291     book = get_object_or_404(models.Book, slug=slug)
 292
 293     book_tag = book.book_tag()
 294     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 295     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 296
 297     return render_to_response('catalogue/book_fragments.html', locals(),
 298         context_instance=RequestContext(request))
 299
 300
 301 def book_detail(request, slug):
 302     try:
 303         book = models.Book.objects.get(slug=slug)
 304     except models.Book.DoesNotExist:
 305         return pdcounter_views.book_stub_detail(request, slug)
 306
 307     book_children = book.children.all().order_by('parent_number', 'sort_key')
 308     return render_to_response('catalogue/book_detail.html', locals(),
 309         context_instance=RequestContext(request))
 310
 311
 312 def player(request, slug):
 313     book = get_object_or_404(models.Book, slug=slug)
 314     if not book.has_media('mp3'):
 315         raise Http404
 316
 317     ogg_files = {}
 318     for m in book.media.filter(type='ogg').order_by().iterator():
 319         ogg_files[m.name] = m
 320
 321     audiobooks = []
 322     have_oggs = True
 323     projects = set()
 324     for mp3 in book.media.filter(type='mp3').iterator():
 325         # ogg files are always from the same project
 326         meta = mp3.extra_info
 327         project = meta.get('project')
 328         if not project:
 329             # temporary fallback
 330             project = u'CzytamySłuchając'
 331
 332         projects.add((project, meta.get('funded_by', '')))
 333
 334         media = {'mp3': mp3}
 335
 336         ogg = ogg_files.get(mp3.name)
 337         if ogg:
 338             media['ogg'] = ogg
 339         else:
 340             have_oggs = False
 341         audiobooks.append(media)
 342
 343     projects = sorted(projects)
 344
 345     extra_info = book.extra_info
 346
 347     return render_to_response('catalogue/player.html', locals(),
 348         context_instance=RequestContext(request))
 349
 350
 351 def book_text(request, slug):
 352     book = get_object_or_404(models.Book, slug=slug)
 353
 354     if not book.has_html_file():
 355         raise Http404
 356     related = book.related_info()
 357     return render_to_response('catalogue/book_text.html', locals(),
 358         context_instance=RequestContext(request))
 359
 360
 361 # ==========
 362 # = Search =
 363 # ==========
 364
 365 def _no_diacritics_regexp(query):
 366     """ returns a regexp for searching for a query without diacritics
 367
 368     should be locale-aware """
 369     names = {
 370         u'a':u'aąĄ', u'c':u'cćĆ', u'e':u'eęĘ', u'l': u'lłŁ', u'n':u'nńŃ', u'o':u'oóÓ', u's':u'sśŚ', u'z':u'zźżŹŻ',
 371         u'ą':u'ąĄ', u'ć':u'ćĆ', u'ę':u'ęĘ', u'ł': u'łŁ', u'ń':u'ńŃ', u'ó':u'óÓ', u'ś':u'śŚ', u'ź':u'źŹ', u'ż':u'żŻ'
 372         }
 373     def repl(m):
 374         l = m.group()
 375         return u"(%s)" % '|'.join(names[l])
 376     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 377
 378 def unicode_re_escape(query):
 379     """ Unicode-friendly version of re.escape """
 380     return re.sub('(?u)(\W)', r'\\\1', query)
 381
 382 def _word_starts_with(name, prefix):
 383     """returns a Q object getting models having `name` contain a word
 384     starting with `prefix`
 385
 386     We define word characters as alphanumeric and underscore, like in JS.
 387
 388     Works for MySQL, PostgreSQL, Oracle.
 389     For SQLite, _sqlite* version is substituted for this.
 390     """
 391     kwargs = {}
 392
 393     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 394     # can't use [[:<:]] (word start),
 395     # but we want both `xy` and `(xy` to catch `(xyz)`
 396     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 397
 398     return Q(**kwargs)
 399
 400
 401 def _word_starts_with_regexp(prefix):
 402     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 403     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 404
 405
 406 def _sqlite_word_starts_with(name, prefix):
 407     """ version of _word_starts_with for SQLite
 408
 409     SQLite in Django uses Python re module
 410     """
 411     kwargs = {}
 412     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 413     return Q(**kwargs)
 414
 415
 416 if hasattr(settings, 'DATABASES'):
 417     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 418         _word_starts_with = _sqlite_word_starts_with
 419 elif settings.DATABASE_ENGINE == 'sqlite3':
 420     _word_starts_with = _sqlite_word_starts_with
 421
 422
 423 class App():
 424     def __init__(self, name, view):
 425         self.name = name
 426         self._view = view
 427         self.lower = name.lower()
 428         self.category = 'application'
 429     def view(self):
 430         return reverse(*self._view)
 431
 432 _apps = (
 433     App(u'Leśmianator', (u'lesmianator', )),
 434     )
 435
 436
 437 def _tags_starting_with(prefix, user=None):
 438     prefix = prefix.lower()
 439     # PD counter
 440     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 441     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 442
 443     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 444     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 445     if user and user.is_authenticated():
 446         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 447     else:
 448         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 449
 450     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 451     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 452
 453
 454 def _get_result_link(match, tag_list):
 455     if isinstance(match, models.Tag):
 456         return reverse('catalogue.views.tagged_object_list',
 457             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 458         )
 459     elif isinstance(match, App):
 460         return match.view()
 461     else:
 462         return match.get_absolute_url()
 463
 464
 465 def _get_result_type(match):
 466     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 467         type = 'book'
 468     else:
 469         type = match.category
 470     return type
 471
 472
 473 def books_starting_with(prefix):
 474     prefix = prefix.lower()
 475     return models.Book.objects.filter(_word_starts_with('title', prefix))
 476
 477
 478 def find_best_matches(query, user=None):
 479     """ Finds a models.Book, Tag, models.BookStub or Author best matching a query.
 480
 481     Returns a with:
 482       - zero elements when nothing is found,
 483       - one element when a best result is found,
 484       - more then one element on multiple exact matches
 485
 486     Raises a ValueError on too short a query.
 487     """
 488
 489     query = query.lower()
 490     if len(query) < 2:
 491         raise ValueError("query must have at least two characters")
 492
 493     result = tuple(_tags_starting_with(query, user))
 494     # remove pdcounter stuff
 495     book_titles = set(match.pretty_title().lower() for match in result
 496                       if isinstance(match, models.Book))
 497     authors = set(match.name.lower() for match in result
 498                   if isinstance(match, models.Tag) and match.category == 'author')
 499     result = tuple(res for res in result if not (
 500                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 501                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 502              ))
 503
 504     exact_matches = tuple(res for res in result if res.name.lower() == query)
 505     if exact_matches:
 506         return exact_matches
 507     else:
 508         return tuple(result)[:1]
 509
 510
 511 def search(request):
 512     tags = request.GET.get('tags', '')
 513     prefix = request.GET.get('q', '')
 514
 515     try:
 516         tag_list = models.Tag.get_tag_list(tags)
 517     except:
 518         tag_list = []
 519
 520     try:
 521         result = find_best_matches(prefix, request.user)
 522     except ValueError:
 523         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 524             context_instance=RequestContext(request))
 525
 526     if len(result) == 1:
 527         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 528     elif len(result) > 1:
 529         return render_to_response('catalogue/search_multiple_hits.html',
 530             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 531             context_instance=RequestContext(request))
 532     else:
 533         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 534         return render_to_response('catalogue/search_no_hits.html',
 535             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 536             context_instance=RequestContext(request))
 537
 538
 539 def tags_starting_with(request):
 540     prefix = request.GET.get('q', '')
 541     # Prefix must have at least 2 characters
 542     if len(prefix) < 2:
 543         return HttpResponse('')
 544     tags_list = []
 545     result = ""
 546     for tag in _tags_starting_with(prefix, request.user):
 547         if not tag.name in tags_list:
 548             result += "\n" + tag.name
 549             tags_list.append(tag.name)
 550     return HttpResponse(result)
 551
 552 def json_tags_starting_with(request, callback=None):
 553     # Callback for JSONP
 554     prefix = request.GET.get('q', '')
 555     callback = request.GET.get('callback', '')
 556     # Prefix must have at least 2 characters
 557     if len(prefix) < 2:
 558         return HttpResponse('')
 559     tags_list = []
 560     for tag in _tags_starting_with(prefix, request.user):
 561         if not tag.name in tags_list:
 562             tags_list.append(tag.name)
 563     if request.GET.get('mozhint', ''):
 564         result = [prefix, tags_list]
 565     else:
 566         result = {"matches": tags_list}
 567     return JsonResponse(result, callback)
 568
 569
 570 # =========
 571 # = Admin =
 572 # =========
 573 @login_required
 574 @staff_required
 575 def import_book(request):
 576     """docstring for import_book"""
 577     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 578     if book_import_form.is_valid():
 579         try:
 580             book_import_form.save()
 581         except:
 582             import sys
 583             import pprint
 584             import traceback
 585             info = sys.exc_info()
 586             exception = pprint.pformat(info[1])
 587             tb = '\n'.join(traceback.format_tb(info[2]))
 588             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 589         return HttpResponse(_("Book imported successfully"))
 590     else:
 591         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 592
 593
 594 # info views for API
 595
 596 def book_info(request, id, lang='pl'):
 597     book = get_object_or_404(models.Book, id=id)
 598     # set language by hand
 599     translation.activate(lang)
 600     return render_to_response('catalogue/book_info.html', locals(),
 601         context_instance=RequestContext(request))
 602
 603
 604 def tag_info(request, id):
 605     tag = get_object_or_404(models.Tag, id=id)
 606     return HttpResponse(tag.description)
 607
 608
 609 def download_zip(request, format, slug=None):
 610     url = None
 611     if format in models.Book.ebook_formats:
 612         url = models.Book.zip_format(format)
 613     elif format in ('mp3', 'ogg') and slug is not None:
 614         book = get_object_or_404(models.Book, slug=slug)
 615         url = book.zip_audiobooks(format)
 616     else:
 617         raise Http404('No format specified for zip package')
 618     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 619
 620
 621 class CustomPDFFormView(AjaxableFormView):
 622     form_class = forms.CustomPDFForm
 623     title = ugettext_lazy('Download custom PDF')
 624     submit = ugettext_lazy('Download')
 625     honeypot = True
 626
 627     def __call__(self, *args, **kwargs):
 628         if settings.NO_CUSTOM_PDF:
 629             raise Http404('Custom PDF is disabled')
 630         return super(CustomPDFFormView, self).__call__(*args, **kwargs)
 631
 632     def form_args(self, request, obj):
 633         """Override to parse view args and give additional args to the form."""
 634         return (obj,), {}
 635
 636     def get_object(self, request, slug, *args, **kwargs):
 637         return get_object_or_404(models.Book, slug=slug)
 638
 639     def context_description(self, request, obj):
 640         return obj.pretty_title()