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 from datetime import datetime
   8
   9 from django.conf import settings
  10 from django.template import RequestContext
  11 from django.shortcuts import render_to_response, get_object_or_404
  12 from django.http import HttpResponse, HttpResponseRedirect, Http404, HttpResponsePermanentRedirect
  13 from django.core.urlresolvers import reverse
  14 from django.db.models import Count, Sum, Q
  15 from django.contrib.auth.decorators import login_required, user_passes_test
  16 from django.utils.datastructures import SortedDict
  17 from django.views.decorators.http import require_POST
  18 from django.contrib import auth
  19 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  20 from django.utils.http import urlquote_plus
  21 from django.views.decorators import cache
  22 from django.utils import translation
  23 from django.utils.translation import ugettext as _
  24 from django.views.generic.list_detail import object_list
  25
  26 from ajaxable.utils import LazyEncoder, JSONResponse
  27 from catalogue import models
  28 from catalogue import forms
  29 from catalogue.utils import split_tags, AttachmentHttpResponse, async_build_pdf
  30 from catalogue.tasks import touch_tag
  31 from pdcounter import models as pdcounter_models
  32 from pdcounter import views as pdcounter_views
  33 from suggest.forms import PublishingSuggestForm
  34 from picture.models import Picture
  35
  36 from itertools import chain
  37 from os import path
  38
  39 staff_required = user_passes_test(lambda user: user.is_staff)
  40
  41
  42 def catalogue(request):
  43     tags = models.Tag.objects.exclude(
  44         category__in=('set', 'book')).exclude(book_count=0)
  45     tags = list(tags)
  46     for tag in tags:
  47         tag.count = tag.book_count
  48     categories = split_tags(tags)
  49     fragment_tags = categories.get('theme', [])
  50
  51     return render_to_response('catalogue/catalogue.html', locals(),
  52         context_instance=RequestContext(request))
  53
  54
  55 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  56     """ generates a listing of all books, optionally filtered with a test function """
  57
  58     books_by_author, orphans, books_by_parent = models.Book.book_list(filter)
  59     books_nav = SortedDict()
  60     for tag in books_by_author:
  61         if books_by_author[tag]:
  62             books_nav.setdefault(tag.sort_key[0], []).append(tag)
  63
  64     return render_to_response(template_name, locals(),
  65         context_instance=RequestContext(request))
  66
  67
  68 def audiobook_list(request):
  69     return book_list(request, Q(media__type='mp3') | Q(media__type='ogg'),
  70                      template_name='catalogue/audiobook_list.html')
  71
  72
  73 def daisy_list(request):
  74     return book_list(request, Q(media__type='daisy'),
  75                      template_name='catalogue/daisy_list.html')
  76
  77
  78 def differentiate_tags(request, tags, ambiguous_slugs):
  79     beginning = '/'.join(tag.url_chunk for tag in tags)
  80     unparsed = '/'.join(ambiguous_slugs[1:])
  81     options = []
  82     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
  83         options.append({
  84             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
  85             'tags': [tag]
  86         })
  87     return render_to_response('catalogue/differentiate_tags.html',
  88                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
  89                 context_instance=RequestContext(request))
  90
  91
  92 def tagged_object_list(request, tags=''):
  93     #    import pdb; pdb.set_trace()
  94     try:
  95         tags = models.Tag.get_tag_list(tags)
  96     except models.Tag.DoesNotExist:
  97         chunks = tags.split('/')
  98         if len(chunks) == 2 and chunks[0] == 'autor':
  99             return pdcounter_views.author_detail(request, chunks[1])
 100         else:
 101             raise Http404
 102     except models.Tag.MultipleObjectsReturned, e:
 103         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 104     except models.Tag.UrlDeprecationWarning, e:
 105         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 106
 107     try:
 108         if len(tags) > settings.MAX_TAG_LIST:
 109             raise Http404
 110     except AttributeError:
 111         pass
 112
 113     if len([tag for tag in tags if tag.category == 'book']):
 114         raise Http404
 115
 116     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 117     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 118     only_shelf = shelf_is_set and len(tags) == 1
 119     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 120
 121     objects = only_author = None
 122     categories = {}
 123
 124     if theme_is_set:
 125         shelf_tags = [tag for tag in tags if tag.category == 'set']
 126         fragment_tags = [tag for tag in tags if tag.category != 'set']
 127         fragments = models.Fragment.tagged.with_all(fragment_tags)
 128
 129         if shelf_tags:
 130             books = models.Book.tagged.with_all(shelf_tags).order_by()
 131             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 132             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 133
 134         # newtagging goes crazy if we just try:
 135         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 136         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 137         fragment_keys = [fragment.pk for fragment in fragments]
 138         if fragment_keys:
 139             related_tags = models.Fragment.tags.usage(counts=True,
 140                                 filters={'pk__in': fragment_keys},
 141                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 142             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 143             categories = split_tags(related_tags)
 144
 145             objects = fragments
 146     else:
 147         if shelf_is_set:
 148             objects = models.Book.tagged.with_all(tags)
 149         else:
 150             objects = models.Book.tagged_top_level(tags)
 151
 152         # get related tags from `tag_counter` and `theme_counter`
 153         related_counts = {}
 154         tags_pks = [tag.pk for tag in tags]
 155         for book in objects:
 156             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 157                 if tag_pk in tags_pks:
 158                     continue
 159                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 160         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 161         related_tags = [tag for tag in related_tags if tag not in tags]
 162         for tag in related_tags:
 163             tag.count = related_counts[tag.pk]
 164
 165         categories = split_tags(related_tags)
 166         del related_tags
 167
 168     if not objects:
 169         only_author = len(tags) == 1 and tags[0].category == 'author'
 170         objects = models.Book.objects.none()
 171
 172         # Add pictures
 173     objects = Picture.tagged.with_all(tags)|objects
 174
 175     return object_list(
 176         request,
 177         objects,
 178         template_name='catalogue/tagged_object_list.html',
 179         extra_context={
 180             'categories': categories,
 181             'only_shelf': only_shelf,
 182             'only_author': only_author,
 183             'only_my_shelf': only_my_shelf,
 184             'formats_form': forms.DownloadFormatsForm(),
 185             'tags': tags,
 186         }
 187     )
 188
 189
 190 def book_fragments(request, book, theme_slug):
 191     kwargs = models.Book.split_urlid(book)
 192     if kwargs is None:
 193         raise Http404
 194     book = get_object_or_404(models.Book, **kwargs)
 195
 196     book_tag = book.book_tag()
 197     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 198     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 199
 200     return render_to_response('catalogue/book_fragments.html', locals(),
 201         context_instance=RequestContext(request))
 202
 203
 204 def book_detail(request, book):
 205     kwargs = models.Book.split_urlid(book)
 206     if kwargs is None:
 207         raise Http404
 208     try:
 209         book = models.Book.objects.get(**kwargs)
 210     except models.Book.DoesNotExist:
 211         return pdcounter_views.book_stub_detail(request, kwargs['slug'])
 212
 213     book_tag = book.book_tag()
 214     tags = list(book.tags.filter(~Q(category='set')))
 215     categories = split_tags(tags)
 216     book_children = book.children.all().order_by('parent_number', 'sort_key')
 217
 218     _book = book
 219     parents = []
 220     while _book.parent:
 221         parents.append(_book.parent)
 222         _book = _book.parent
 223     parents = reversed(parents)
 224
 225     theme_counter = book.theme_counter
 226     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 227     for tag in book_themes:
 228         tag.count = theme_counter[tag.pk]
 229
 230     extra_info = book.get_extra_info_value()
 231     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 232
 233     projects = set()
 234     for m in book.media.filter(type='mp3'):
 235         # ogg files are always from the same project
 236         meta = m.get_extra_info_value()
 237         project = meta.get('project')
 238         if not project:
 239             # temporary fallback
 240             project = u'CzytamySłuchając'
 241
 242         projects.add((project, meta.get('funded_by', '')))
 243     projects = sorted(projects)
 244
 245     custom_pdf_form = forms.CustomPDFForm()
 246     return render_to_response('catalogue/book_detail.html', locals(),
 247         context_instance=RequestContext(request))
 248
 249
 250 def book_text(request, book):
 251     kwargs = models.Book.split_fileid(book)
 252     if kwargs is None:
 253         raise Http404
 254     book = get_object_or_404(models.Book, **kwargs)
 255
 256     if not book.has_html_file():
 257         raise Http404
 258     book_themes = {}
 259     for fragment in book.fragments.all():
 260         for theme in fragment.tags.filter(category='theme'):
 261             book_themes.setdefault(theme, []).append(fragment)
 262
 263     book_themes = book_themes.items()
 264     book_themes.sort(key=lambda s: s[0].sort_key)
 265     return render_to_response('catalogue/book_text.html', locals(),
 266         context_instance=RequestContext(request))
 267
 268
 269 # ==========
 270 # = Search =
 271 # ==========
 272
 273 def _no_diacritics_regexp(query):
 274     """ returns a regexp for searching for a query without diacritics
 275
 276     should be locale-aware """
 277     names = {
 278         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',
 279         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'
 280         }
 281     def repl(m):
 282         l = m.group()
 283         return u"(%s)" % '|'.join(names[l])
 284     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 285
 286 def unicode_re_escape(query):
 287     """ Unicode-friendly version of re.escape """
 288     return re.sub('(?u)(\W)', r'\\\1', query)
 289
 290 def _word_starts_with(name, prefix):
 291     """returns a Q object getting models having `name` contain a word
 292     starting with `prefix`
 293
 294     We define word characters as alphanumeric and underscore, like in JS.
 295
 296     Works for MySQL, PostgreSQL, Oracle.
 297     For SQLite, _sqlite* version is substituted for this.
 298     """
 299     kwargs = {}
 300
 301     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 302     # can't use [[:<:]] (word start),
 303     # but we want both `xy` and `(xy` to catch `(xyz)`
 304     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 305
 306     return Q(**kwargs)
 307
 308
 309 def _word_starts_with_regexp(prefix):
 310     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 311     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 312
 313
 314 def _sqlite_word_starts_with(name, prefix):
 315     """ version of _word_starts_with for SQLite
 316
 317     SQLite in Django uses Python re module
 318     """
 319     kwargs = {}
 320     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 321     return Q(**kwargs)
 322
 323
 324 if hasattr(settings, 'DATABASES'):
 325     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 326         _word_starts_with = _sqlite_word_starts_with
 327 elif settings.DATABASE_ENGINE == 'sqlite3':
 328     _word_starts_with = _sqlite_word_starts_with
 329
 330
 331 class App():
 332     def __init__(self, name, view):
 333         self.name = name
 334         self._view = view
 335         self.lower = name.lower()
 336         self.category = 'application'
 337     def view(self):
 338         return reverse(*self._view)
 339
 340 _apps = (
 341     App(u'Leśmianator', (u'lesmianator', )),
 342     )
 343
 344
 345 def _tags_starting_with(prefix, user=None):
 346     prefix = prefix.lower()
 347     # PD counter
 348     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 349     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 350
 351     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 352     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 353     if user and user.is_authenticated():
 354         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 355     else:
 356         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 357
 358     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 359     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 360
 361
 362 def _get_result_link(match, tag_list):
 363     if isinstance(match, models.Tag):
 364         return reverse('catalogue.views.tagged_object_list',
 365             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 366         )
 367     elif isinstance(match, App):
 368         return match.view()
 369     else:
 370         return match.get_absolute_url()
 371
 372
 373 def _get_result_type(match):
 374     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 375         type = 'book'
 376     else:
 377         type = match.category
 378     return type
 379
 380
 381 def books_starting_with(prefix):
 382     prefix = prefix.lower()
 383     return models.Book.objects.filter(_word_starts_with('title', prefix))
 384
 385
 386 def find_best_matches(query, user=None):
 387     """ Finds a models.Book, Tag, models.BookStub or Author best matching a query.
 388
 389     Returns a with:
 390       - zero elements when nothing is found,
 391       - one element when a best result is found,
 392       - more then one element on multiple exact matches
 393
 394     Raises a ValueError on too short a query.
 395     """
 396
 397     query = query.lower()
 398     if len(query) < 2:
 399         raise ValueError("query must have at least two characters")
 400
 401     result = tuple(_tags_starting_with(query, user))
 402     # remove pdcounter stuff
 403     book_titles = set(match.pretty_title().lower() for match in result
 404                       if isinstance(match, models.Book))
 405     authors = set(match.name.lower() for match in result
 406                   if isinstance(match, models.Tag) and match.category=='author')
 407     result = tuple(res for res in result if not (
 408                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 409                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 410              ))
 411
 412     exact_matches = tuple(res for res in result if res.name.lower() == query)
 413     if exact_matches:
 414         return exact_matches
 415     else:
 416         return tuple(result)[:1]
 417
 418
 419 def search(request):
 420     tags = request.GET.get('tags', '')
 421     prefix = request.GET.get('q', '')
 422
 423     try:
 424         tag_list = models.Tag.get_tag_list(tags)
 425     except:
 426         tag_list = []
 427
 428     try:
 429         result = find_best_matches(prefix, request.user)
 430     except ValueError:
 431         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 432             context_instance=RequestContext(request))
 433
 434     if len(result) == 1:
 435         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 436     elif len(result) > 1:
 437         return render_to_response('catalogue/search_multiple_hits.html',
 438             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 439             context_instance=RequestContext(request))
 440     else:
 441         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 442         return render_to_response('catalogue/search_no_hits.html',
 443             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 444             context_instance=RequestContext(request))
 445
 446
 447 def tags_starting_with(request):
 448     prefix = request.GET.get('q', '')
 449     # Prefix must have at least 2 characters
 450     if len(prefix) < 2:
 451         return HttpResponse('')
 452     tags_list = []
 453     result = ""
 454     for tag in _tags_starting_with(prefix, request.user):
 455         if not tag.name in tags_list:
 456             result += "\n" + tag.name
 457             tags_list.append(tag.name)
 458     return HttpResponse(result)
 459
 460 def json_tags_starting_with(request, callback=None):
 461     # Callback for JSONP
 462     prefix = request.GET.get('q', '')
 463     callback = request.GET.get('callback', '')
 464     # Prefix must have at least 2 characters
 465     if len(prefix) < 2:
 466         return HttpResponse('')
 467     tags_list = []
 468     for tag in _tags_starting_with(prefix, request.user):
 469         if not tag.name in tags_list:
 470             tags_list.append(tag.name)
 471     if request.GET.get('mozhint', ''):
 472         result = [prefix, tags_list]
 473     else:
 474         result = {"matches": tags_list}
 475     return JSONResponse(result, callback)
 476
 477 # ====================
 478 # = Shelf management =
 479 # ====================
 480 @login_required
 481 @cache.never_cache
 482 def user_shelves(request):
 483     shelves = models.Tag.objects.filter(category='set', user=request.user)
 484     new_set_form = forms.NewSetForm()
 485     return render_to_response('catalogue/user_shelves.html', locals(),
 486             context_instance=RequestContext(request))
 487
 488 @cache.never_cache
 489 def book_sets(request, book):
 490     if not request.user.is_authenticated():
 491         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 492
 493     kwargs = models.Book.split_urlid(book)
 494     if kwargs is None:
 495         raise Http404
 496     book = get_object_or_404(models.Book, **kwargs)
 497
 498     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 499     book_sets = book.tags.filter(category='set', user=request.user)
 500
 501     if request.method == 'POST':
 502         form = forms.ObjectSetsForm(book, request.user, request.POST)
 503         if form.is_valid():
 504             old_shelves = list(book.tags.filter(category='set'))
 505             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 506
 507             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 508                 touch_tag(shelf)
 509
 510             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 511                 touch_tag(shelf)
 512
 513             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 514             if request.is_ajax():
 515                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 516             else:
 517                 return HttpResponseRedirect('/')
 518     else:
 519         form = forms.ObjectSetsForm(book, request.user)
 520         new_set_form = forms.NewSetForm()
 521
 522     return render_to_response('catalogue/book_sets.html', locals(),
 523         context_instance=RequestContext(request))
 524
 525
 526 @login_required
 527 @require_POST
 528 @cache.never_cache
 529 def remove_from_shelf(request, shelf, book):
 530     kwargs = models.Book.split_urlid(book)
 531     if kwargs is None:
 532         raise Http404
 533     book = get_object_or_404(models.Book, **kwargs)
 534
 535     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 536
 537     if shelf in book.tags:
 538         models.Tag.objects.remove_tag(book, shelf)
 539         touch_tag(shelf)
 540
 541         return HttpResponse(_('Book was successfully removed from the shelf'))
 542     else:
 543         return HttpResponse(_('This book is not on the shelf'))
 544
 545
 546 def collect_books(books):
 547     """
 548     Returns all real books in collection.
 549     """
 550     result = []
 551     for book in books:
 552         if len(book.children.all()) == 0:
 553             result.append(book)
 554         else:
 555             result += collect_books(book.children.all())
 556     return result
 557
 558
 559 @cache.never_cache
 560 def download_shelf(request, slug):
 561     """"
 562     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 563     without loading the whole file into memory. A similar approach can
 564     be used for large dynamic PDF files.
 565     """
 566     from slughifi import slughifi
 567     import tempfile
 568     import zipfile
 569
 570     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 571
 572     formats = []
 573     form = forms.DownloadFormatsForm(request.GET)
 574     if form.is_valid():
 575         formats = form.cleaned_data['formats']
 576     if len(formats) == 0:
 577         formats = models.Book.ebook_formats
 578
 579     # Create a ZIP archive
 580     temp = tempfile.TemporaryFile()
 581     archive = zipfile.ZipFile(temp, 'w')
 582
 583     for book in collect_books(models.Book.tagged.with_all(shelf)):
 584         fileid = book.fileid()
 585         for ebook_format in models.Book.ebook_formats:
 586             if ebook_format in formats and book.has_media(ebook_format):
 587                 filename = book.get_media(ebook_format).path
 588                 archive.write(filename, str('%s.%s' % (fileid, ebook_format)))
 589     archive.close()
 590
 591     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 592     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 593     response['Content-Length'] = temp.tell()
 594
 595     temp.seek(0)
 596     response.write(temp.read())
 597     return response
 598
 599
 600 @cache.never_cache
 601 def shelf_book_formats(request, shelf):
 602     """"
 603     Returns a list of formats of books in shelf.
 604     """
 605     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 606
 607     formats = {}
 608     for ebook_format in models.Book.ebook_formats:
 609         formats[ebook_format] = False
 610
 611     for book in collect_books(models.Book.tagged.with_all(shelf)):
 612         for ebook_format in models.Book.ebook_formats:
 613             if book.has_media(ebook_format):
 614                 formats[ebook_format] = True
 615
 616     return HttpResponse(LazyEncoder().encode(formats))
 617
 618
 619 @login_required
 620 @require_POST
 621 @cache.never_cache
 622 def new_set(request):
 623     new_set_form = forms.NewSetForm(request.POST)
 624     if new_set_form.is_valid():
 625         new_set = new_set_form.save(request.user)
 626
 627         if request.is_ajax():
 628             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 629         else:
 630             return HttpResponseRedirect('/')
 631
 632     return HttpResponseRedirect('/')
 633
 634
 635 @login_required
 636 @require_POST
 637 @cache.never_cache
 638 def delete_shelf(request, slug):
 639     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 640     user_set.delete()
 641
 642     if request.is_ajax():
 643         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 644     else:
 645         return HttpResponseRedirect('/')
 646
 647
 648 # =========
 649 # = Admin =
 650 # =========
 651 @login_required
 652 @staff_required
 653 def import_book(request):
 654     """docstring for import_book"""
 655     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 656     if book_import_form.is_valid():
 657         try:
 658             book_import_form.save()
 659         except:
 660             import sys
 661             import pprint
 662             import traceback
 663             info = sys.exc_info()
 664             exception = pprint.pformat(info[1])
 665             tb = '\n'.join(traceback.format_tb(info[2]))
 666             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 667         return HttpResponse(_("Book imported successfully"))
 668     else:
 669         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 670
 671
 672 # info views for API
 673
 674 def book_info(request, id, lang='pl'):
 675     book = get_object_or_404(models.Book, id=id)
 676     # set language by hand
 677     translation.activate(lang)
 678     return render_to_response('catalogue/book_info.html', locals(),
 679         context_instance=RequestContext(request))
 680
 681
 682 def tag_info(request, id):
 683     tag = get_object_or_404(models.Tag, id=id)
 684     return HttpResponse(tag.description)
 685
 686
 687 def download_zip(request, format, book=None):
 688     kwargs = models.Book.split_fileid(book)
 689
 690     url = None
 691     if format in models.Book.ebook_formats:
 692         url = models.Book.zip_format(format)
 693     elif format == 'audiobook' and kwargs is not None:
 694         book = get_object_or_404(models.Book, **kwargs)
 695         url = book.zip_audiobooks()
 696     else:
 697         raise Http404('No format specified for zip package')
 698     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 699
 700
 701 def download_custom_pdf(request, book_fileid):
 702     kwargs = models.Book.split_fileid(book_fileid)
 703     if kwargs is None:
 704         raise Http404
 705     book = get_object_or_404(models.Book, **kwargs)
 706
 707     if request.method == 'GET':
 708         form = forms.CustomPDFForm(request.GET)
 709         if form.is_valid():
 710             cust = form.customizations
 711             pdf_file = models.get_customized_pdf_path(book, cust)
 712
 713             if not path.exists(pdf_file):
 714                 result = async_build_pdf.delay(book.id, cust, pdf_file)
 715                 result.wait()
 716             return AttachmentHttpResponse(file_name=("%s.pdf" % book_fileid), file_path=pdf_file, mimetype="application/pdf")
 717         else:
 718             raise Http404(_('Incorrect customization options for PDF'))
 719     else:
 720         raise Http404(_('Bad method'))