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