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         if books.count() > 0:
 243             # get related tags from `tag_counter` and `theme_counter`
 244             related_counts = {}
 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             related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 252             related_tags = [tag for tag in related_tags if tag not in tags]
 253             for tag in related_tags:
 254                 tag.count = related_counts[tag.pk]
 255
 256             categories = split_tags(related_tags)
 257             del related_tags
 258
 259         if pictures.count() > 0:
 260             related_counts = {}
 261             tags_pks = [tag.pk for tag in tags]
 262             for picture in pictures:
 263                 for tag_pk, value in itertools.chain(picture.tag_counter.iteritems(), picture.theme_counter.iteritems()):
 264                     if tag_pk in tags_pks:
 265                         continue
 266                     logging.info("counting tag not in tags_pks: %d", tag_pk)
 267                     related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 268             related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 269             related_tags = [tag for tag in related_tags if tag not in tags]
 270             for tag in related_tags:
 271                 tag.count = related_counts[tag.pk]
 272
 273             categories = split_tags(related_tags)
 274             del related_tags
 275
 276             logging.info("Returning %d picutres and %d books" % (pictures.count(), books.count()))
 277             objects = SortedMultiQuerySet(pictures, books, order_by='sort_key_author')
 278
 279
 280
 281     if not objects:
 282         only_author = len(tags) == 1 and tags[0].category == 'author'
 283         objects = models.Book.objects.none()
 284
 285
 286     return render_to_response('catalogue/tagged_object_list.html',
 287         {
 288             'object_list': objects,
 289             'categories': categories,
 290             'only_shelf': only_shelf,
 291             'only_author': only_author,
 292             'only_my_shelf': only_my_shelf,
 293             'formats_form': forms.DownloadFormatsForm(),
 294             'tags': tags,
 295             'theme_is_set': theme_is_set,
 296         },
 297         context_instance=RequestContext(request))
 298
 299
 300 def book_fragments(request, slug, theme_slug):
 301     book = get_object_or_404(models.Book, slug=slug)
 302
 303     book_tag = book.book_tag()
 304     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 305     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 306
 307     return render_to_response('catalogue/book_fragments.html', locals(),
 308         context_instance=RequestContext(request))
 309
 310
 311 def book_detail(request, slug):
 312     try:
 313         book = models.Book.objects.get(slug=slug)
 314     except models.Book.DoesNotExist:
 315         return pdcounter_views.book_stub_detail(request, slug)
 316
 317     book_children = book.children.all().order_by('parent_number', 'sort_key')
 318     return render_to_response('catalogue/book_detail.html', locals(),
 319         context_instance=RequestContext(request))
 320
 321
 322 def player(request, slug):
 323     book = get_object_or_404(models.Book, slug=slug)
 324     if not book.has_media('mp3'):
 325         raise Http404
 326
 327     ogg_files = {}
 328     for m in book.media.filter(type='ogg').order_by().iterator():
 329         ogg_files[m.name] = m
 330
 331     audiobooks = []
 332     have_oggs = True
 333     projects = set()
 334     for mp3 in book.media.filter(type='mp3').iterator():
 335         # ogg files are always from the same project
 336         meta = mp3.extra_info
 337         project = meta.get('project')
 338         if not project:
 339             # temporary fallback
 340             project = u'CzytamySłuchając'
 341
 342         projects.add((project, meta.get('funded_by', '')))
 343
 344         media = {'mp3': mp3}
 345
 346         ogg = ogg_files.get(mp3.name)
 347         if ogg:
 348             media['ogg'] = ogg
 349         else:
 350             have_oggs = False
 351         audiobooks.append(media)
 352
 353     projects = sorted(projects)
 354
 355     extra_info = book.extra_info
 356
 357     return render_to_response('catalogue/player.html', locals(),
 358         context_instance=RequestContext(request))
 359
 360
 361 def book_text(request, slug):
 362     book = get_object_or_404(models.Book, slug=slug)
 363
 364     if not book.has_html_file():
 365         raise Http404
 366     related = book.related_info()
 367     return render_to_response('catalogue/book_text.html', locals(),
 368         context_instance=RequestContext(request))
 369
 370
 371 # ==========
 372 # = Search =
 373 # ==========
 374
 375 def _no_diacritics_regexp(query):
 376     """ returns a regexp for searching for a query without diacritics
 377
 378     should be locale-aware """
 379     names = {
 380         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',
 381         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'
 382         }
 383     def repl(m):
 384         l = m.group()
 385         return u"(%s)" % '|'.join(names[l])
 386     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 387
 388 def unicode_re_escape(query):
 389     """ Unicode-friendly version of re.escape """
 390     return re.sub('(?u)(\W)', r'\\\1', query)
 391
 392 def _word_starts_with(name, prefix):
 393     """returns a Q object getting models having `name` contain a word
 394     starting with `prefix`
 395
 396     We define word characters as alphanumeric and underscore, like in JS.
 397
 398     Works for MySQL, PostgreSQL, Oracle.
 399     For SQLite, _sqlite* version is substituted for this.
 400     """
 401     kwargs = {}
 402
 403     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 404     # can't use [[:<:]] (word start),
 405     # but we want both `xy` and `(xy` to catch `(xyz)`
 406     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 407
 408     return Q(**kwargs)
 409
 410
 411 def _word_starts_with_regexp(prefix):
 412     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 413     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 414
 415
 416 def _sqlite_word_starts_with(name, prefix):
 417     """ version of _word_starts_with for SQLite
 418
 419     SQLite in Django uses Python re module
 420     """
 421     kwargs = {}
 422     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 423     return Q(**kwargs)
 424
 425
 426 if hasattr(settings, 'DATABASES'):
 427     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 428         _word_starts_with = _sqlite_word_starts_with
 429 elif settings.DATABASE_ENGINE == 'sqlite3':
 430     _word_starts_with = _sqlite_word_starts_with
 431
 432
 433 class App():
 434     def __init__(self, name, view):
 435         self.name = name
 436         self._view = view
 437         self.lower = name.lower()
 438         self.category = 'application'
 439     def view(self):
 440         return reverse(*self._view)
 441
 442 _apps = (
 443     App(u'Leśmianator', (u'lesmianator', )),
 444     )
 445
 446
 447 def _tags_starting_with(prefix, user=None):
 448     prefix = prefix.lower()
 449     # PD counter
 450     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 451     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 452
 453     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 454     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 455     if user and user.is_authenticated():
 456         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 457     else:
 458         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 459
 460     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 461     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 462
 463
 464 def _get_result_link(match, tag_list):
 465     if isinstance(match, models.Tag):
 466         return reverse('catalogue.views.tagged_object_list',
 467             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 468         )
 469     elif isinstance(match, App):
 470         return match.view()
 471     else:
 472         return match.get_absolute_url()
 473
 474
 475 def _get_result_type(match):
 476     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 477         type = 'book'
 478     else:
 479         type = match.category
 480     return type
 481
 482
 483 def books_starting_with(prefix):
 484     prefix = prefix.lower()
 485     return models.Book.objects.filter(_word_starts_with('title', prefix))
 486
 487
 488 def find_best_matches(query, user=None):
 489     """ Finds a models.Book, Tag, models.BookStub or Author best matching a query.
 490
 491     Returns a with:
 492       - zero elements when nothing is found,
 493       - one element when a best result is found,
 494       - more then one element on multiple exact matches
 495
 496     Raises a ValueError on too short a query.
 497     """
 498
 499     query = query.lower()
 500     if len(query) < 2:
 501         raise ValueError("query must have at least two characters")
 502
 503     result = tuple(_tags_starting_with(query, user))
 504     # remove pdcounter stuff
 505     book_titles = set(match.pretty_title().lower() for match in result
 506                       if isinstance(match, models.Book))
 507     authors = set(match.name.lower() for match in result
 508                   if isinstance(match, models.Tag) and match.category=='author')
 509     result = tuple(res for res in result if not (
 510                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 511                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 512              ))
 513
 514     exact_matches = tuple(res for res in result if res.name.lower() == query)
 515     if exact_matches:
 516         return exact_matches
 517     else:
 518         return tuple(result)[:1]
 519
 520
 521 def search(request):
 522     tags = request.GET.get('tags', '')
 523     prefix = request.GET.get('q', '')
 524
 525     try:
 526         tag_list = models.Tag.get_tag_list(tags)
 527     except:
 528         tag_list = []
 529
 530     try:
 531         result = find_best_matches(prefix, request.user)
 532     except ValueError:
 533         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 534             context_instance=RequestContext(request))
 535
 536     if len(result) == 1:
 537         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 538     elif len(result) > 1:
 539         return render_to_response('catalogue/search_multiple_hits.html',
 540             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 541             context_instance=RequestContext(request))
 542     else:
 543         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 544         return render_to_response('catalogue/search_no_hits.html',
 545             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 546             context_instance=RequestContext(request))
 547
 548
 549 def tags_starting_with(request):
 550     prefix = request.GET.get('q', '')
 551     # Prefix must have at least 2 characters
 552     if len(prefix) < 2:
 553         return HttpResponse('')
 554     tags_list = []
 555     result = ""
 556     for tag in _tags_starting_with(prefix, request.user):
 557         if not tag.name in tags_list:
 558             result += "\n" + tag.name
 559             tags_list.append(tag.name)
 560     return HttpResponse(result)
 561
 562 def json_tags_starting_with(request, callback=None):
 563     # Callback for JSONP
 564     prefix = request.GET.get('q', '')
 565     callback = request.GET.get('callback', '')
 566     # Prefix must have at least 2 characters
 567     if len(prefix) < 2:
 568         return HttpResponse('')
 569     tags_list = []
 570     for tag in _tags_starting_with(prefix, request.user):
 571         if not tag.name in tags_list:
 572             tags_list.append(tag.name)
 573     if request.GET.get('mozhint', ''):
 574         result = [prefix, tags_list]
 575     else:
 576         result = {"matches": tags_list}
 577     return JSONResponse(result, callback)
 578
 579
 580 # =========
 581 # = Admin =
 582 # =========
 583 @login_required
 584 @staff_required
 585 def import_book(request):
 586     """docstring for import_book"""
 587     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 588     if book_import_form.is_valid():
 589         try:
 590             book_import_form.save()
 591         except:
 592             import sys
 593             import pprint
 594             import traceback
 595             info = sys.exc_info()
 596             exception = pprint.pformat(info[1])
 597             tb = '\n'.join(traceback.format_tb(info[2]))
 598             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 599         return HttpResponse(_("Book imported successfully"))
 600     else:
 601         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 602
 603
 604 # info views for API
 605
 606 def book_info(request, id, lang='pl'):
 607     book = get_object_or_404(models.Book, id=id)
 608     # set language by hand
 609     translation.activate(lang)
 610     return render_to_response('catalogue/book_info.html', locals(),
 611         context_instance=RequestContext(request))
 612
 613
 614 def tag_info(request, id):
 615     tag = get_object_or_404(models.Tag, id=id)
 616     return HttpResponse(tag.description)
 617
 618
 619 def download_zip(request, format, slug=None):
 620     url = None
 621     if format in models.Book.ebook_formats:
 622         url = models.Book.zip_format(format)
 623     elif format in ('mp3', 'ogg') and slug is not None:
 624         book = get_object_or_404(models.Book, slug=slug)
 625         url = book.zip_audiobooks(format)
 626     else:
 627         raise Http404('No format specified for zip package')
 628     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 629
 630
 631 class CustomPDFFormView(AjaxableFormView):
 632     form_class = forms.CustomPDFForm
 633     title = ugettext_lazy('Download custom PDF')
 634     submit = ugettext_lazy('Download')
 635     honeypot = True
 636
 637     def __call__(self, *args, **kwargs):
 638         if settings.NO_CUSTOM_PDF:
 639             raise Http404('Custom PDF is disabled')
 640         return super(CustomPDFFormView, self).__call__(*args, **kwargs)
 641
 642     def form_args(self, request, obj):
 643         """Override to parse view args and give additional args to the form."""
 644         return (obj,), {}
 645
 646     def get_object(self, request, slug, *args, **kwargs):
 647         return get_object_or_404(models.Book, slug=slug)
 648
 649     def context_description(self, request, obj):
 650         return obj.pretty_title()