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,
  30     async_build_pdf, MultiQuerySet)
  31 from catalogue.tasks import touch_tag
  32 from pdcounter import models as pdcounter_models
  33 from pdcounter import views as pdcounter_views
  34 from suggest.forms import PublishingSuggestForm
  35 from picture.models import Picture
  36
  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 = MultiQuerySet(Picture.tagged.with_all(tags), objects)
 174
 175     return render_to_response('catalogue/tagged_object_list.html',
 176         {
 177             'object_list': objects,
 178             'categories': categories,
 179             'only_shelf': only_shelf,
 180             'only_author': only_author,
 181             'only_my_shelf': only_my_shelf,
 182             'formats_form': forms.DownloadFormatsForm(),
 183             'tags': tags,
 184         },
 185         context_instance=RequestContext(request))
 186
 187
 188 def book_fragments(request, slug, theme_slug):
 189     book = get_object_or_404(models.Book, slug=slug)
 190
 191     book_tag = book.book_tag()
 192     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 193     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 194
 195     return render_to_response('catalogue/book_fragments.html', locals(),
 196         context_instance=RequestContext(request))
 197
 198
 199 def book_detail(request, slug):
 200     try:
 201         book = models.Book.objects.get(slug=slug)
 202     except models.Book.DoesNotExist:
 203         return pdcounter_views.book_stub_detail(request, kwargs['slug'])
 204
 205     book_tag = book.book_tag()
 206     tags = list(book.tags.filter(~Q(category='set')))
 207     categories = split_tags(tags)
 208     book_children = book.children.all().order_by('parent_number', 'sort_key')
 209
 210     _book = book
 211     parents = []
 212     while _book.parent:
 213         parents.append(_book.parent)
 214         _book = _book.parent
 215     parents = reversed(parents)
 216
 217     theme_counter = book.theme_counter
 218     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 219     for tag in book_themes:
 220         tag.count = theme_counter[tag.pk]
 221
 222     extra_info = book.get_extra_info_value()
 223     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 224
 225     custom_pdf_form = forms.CustomPDFForm()
 226     return render_to_response('catalogue/book_detail.html', locals(),
 227         context_instance=RequestContext(request))
 228
 229
 230 def player(request, slug):
 231     book = get_object_or_404(models.Book, slug=slug)
 232     if not book.has_media('mp3'):
 233         raise Http404
 234
 235     ogg_files = {}
 236     for m in book.media.filter(type='ogg').order_by():
 237         ogg_files[m.name] = m
 238
 239     audiobooks = []
 240     have_oggs = True
 241     projects = set()
 242     for mp3 in book.media.filter(type='mp3'):
 243         # ogg files are always from the same project
 244         meta = mp3.get_extra_info_value()
 245         project = meta.get('project')
 246         if not project:
 247             # temporary fallback
 248             project = u'CzytamySłuchając'
 249
 250         projects.add((project, meta.get('funded_by', '')))
 251
 252         media = {'mp3': mp3}
 253
 254         ogg = ogg_files.get(mp3.name)
 255         if ogg:
 256             media['ogg'] = ogg
 257         else:
 258             have_oggs = False
 259         audiobooks.append(media)
 260     print audiobooks
 261
 262     projects = sorted(projects)
 263
 264     return render_to_response('catalogue/player.html', locals(),
 265         context_instance=RequestContext(request))
 266
 267
 268 def book_text(request, slug):
 269     book = get_object_or_404(models.Book, slug=slug)
 270
 271     if not book.has_html_file():
 272         raise Http404
 273     book_themes = {}
 274     for fragment in book.fragments.all():
 275         for theme in fragment.tags.filter(category='theme'):
 276             book_themes.setdefault(theme, []).append(fragment)
 277
 278     book_themes = book_themes.items()
 279     book_themes.sort(key=lambda s: s[0].sort_key)
 280     return render_to_response('catalogue/book_text.html', locals(),
 281         context_instance=RequestContext(request))
 282
 283
 284 # ==========
 285 # = Search =
 286 # ==========
 287
 288 def _no_diacritics_regexp(query):
 289     """ returns a regexp for searching for a query without diacritics
 290
 291     should be locale-aware """
 292     names = {
 293         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',
 294         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'
 295         }
 296     def repl(m):
 297         l = m.group()
 298         return u"(%s)" % '|'.join(names[l])
 299     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 300
 301 def unicode_re_escape(query):
 302     """ Unicode-friendly version of re.escape """
 303     return re.sub('(?u)(\W)', r'\\\1', query)
 304
 305 def _word_starts_with(name, prefix):
 306     """returns a Q object getting models having `name` contain a word
 307     starting with `prefix`
 308
 309     We define word characters as alphanumeric and underscore, like in JS.
 310
 311     Works for MySQL, PostgreSQL, Oracle.
 312     For SQLite, _sqlite* version is substituted for this.
 313     """
 314     kwargs = {}
 315
 316     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 317     # can't use [[:<:]] (word start),
 318     # but we want both `xy` and `(xy` to catch `(xyz)`
 319     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 320
 321     return Q(**kwargs)
 322
 323
 324 def _word_starts_with_regexp(prefix):
 325     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 326     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 327
 328
 329 def _sqlite_word_starts_with(name, prefix):
 330     """ version of _word_starts_with for SQLite
 331
 332     SQLite in Django uses Python re module
 333     """
 334     kwargs = {}
 335     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 336     return Q(**kwargs)
 337
 338
 339 if hasattr(settings, 'DATABASES'):
 340     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 341         _word_starts_with = _sqlite_word_starts_with
 342 elif settings.DATABASE_ENGINE == 'sqlite3':
 343     _word_starts_with = _sqlite_word_starts_with
 344
 345
 346 class App():
 347     def __init__(self, name, view):
 348         self.name = name
 349         self._view = view
 350         self.lower = name.lower()
 351         self.category = 'application'
 352     def view(self):
 353         return reverse(*self._view)
 354
 355 _apps = (
 356     App(u'Leśmianator', (u'lesmianator', )),
 357     )
 358
 359
 360 def _tags_starting_with(prefix, user=None):
 361     prefix = prefix.lower()
 362     # PD counter
 363     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 364     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 365
 366     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 367     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 368     if user and user.is_authenticated():
 369         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 370     else:
 371         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 372
 373     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 374     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 375
 376
 377 def _get_result_link(match, tag_list):
 378     if isinstance(match, models.Tag):
 379         return reverse('catalogue.views.tagged_object_list',
 380             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 381         )
 382     elif isinstance(match, App):
 383         return match.view()
 384     else:
 385         return match.get_absolute_url()
 386
 387
 388 def _get_result_type(match):
 389     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 390         type = 'book'
 391     else:
 392         type = match.category
 393     return type
 394
 395
 396 def books_starting_with(prefix):
 397     prefix = prefix.lower()
 398     return models.Book.objects.filter(_word_starts_with('title', prefix))
 399
 400
 401 def find_best_matches(query, user=None):
 402     """ Finds a models.Book, Tag, models.BookStub or Author best matching a query.
 403
 404     Returns a with:
 405       - zero elements when nothing is found,
 406       - one element when a best result is found,
 407       - more then one element on multiple exact matches
 408
 409     Raises a ValueError on too short a query.
 410     """
 411
 412     query = query.lower()
 413     if len(query) < 2:
 414         raise ValueError("query must have at least two characters")
 415
 416     result = tuple(_tags_starting_with(query, user))
 417     # remove pdcounter stuff
 418     book_titles = set(match.pretty_title().lower() for match in result
 419                       if isinstance(match, models.Book))
 420     authors = set(match.name.lower() for match in result
 421                   if isinstance(match, models.Tag) and match.category=='author')
 422     result = tuple(res for res in result if not (
 423                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 424                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 425              ))
 426
 427     exact_matches = tuple(res for res in result if res.name.lower() == query)
 428     if exact_matches:
 429         return exact_matches
 430     else:
 431         return tuple(result)[:1]
 432
 433
 434 def search(request):
 435     tags = request.GET.get('tags', '')
 436     prefix = request.GET.get('q', '')
 437
 438     try:
 439         tag_list = models.Tag.get_tag_list(tags)
 440     except:
 441         tag_list = []
 442
 443     try:
 444         result = find_best_matches(prefix, request.user)
 445     except ValueError:
 446         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 447             context_instance=RequestContext(request))
 448
 449     if len(result) == 1:
 450         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 451     elif len(result) > 1:
 452         return render_to_response('catalogue/search_multiple_hits.html',
 453             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 454             context_instance=RequestContext(request))
 455     else:
 456         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 457         return render_to_response('catalogue/search_no_hits.html',
 458             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 459             context_instance=RequestContext(request))
 460
 461
 462 def tags_starting_with(request):
 463     prefix = request.GET.get('q', '')
 464     # Prefix must have at least 2 characters
 465     if len(prefix) < 2:
 466         return HttpResponse('')
 467     tags_list = []
 468     result = ""
 469     for tag in _tags_starting_with(prefix, request.user):
 470         if not tag.name in tags_list:
 471             result += "\n" + tag.name
 472             tags_list.append(tag.name)
 473     return HttpResponse(result)
 474
 475 def json_tags_starting_with(request, callback=None):
 476     # Callback for JSONP
 477     prefix = request.GET.get('q', '')
 478     callback = request.GET.get('callback', '')
 479     # Prefix must have at least 2 characters
 480     if len(prefix) < 2:
 481         return HttpResponse('')
 482     tags_list = []
 483     for tag in _tags_starting_with(prefix, request.user):
 484         if not tag.name in tags_list:
 485             tags_list.append(tag.name)
 486     if request.GET.get('mozhint', ''):
 487         result = [prefix, tags_list]
 488     else:
 489         result = {"matches": tags_list}
 490     return JSONResponse(result, callback)
 491
 492 # ====================
 493 # = Shelf management =
 494 # ====================
 495 @login_required
 496 @cache.never_cache
 497 def user_shelves(request):
 498     shelves = models.Tag.objects.filter(category='set', user=request.user)
 499     new_set_form = forms.NewSetForm()
 500     return render_to_response('catalogue/user_shelves.html', locals(),
 501             context_instance=RequestContext(request))
 502
 503 @cache.never_cache
 504 def book_sets(request, slug):
 505     if not request.user.is_authenticated():
 506         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 507
 508     book = get_object_or_404(models.Book, slug=slug)
 509
 510     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 511     book_sets = book.tags.filter(category='set', user=request.user)
 512
 513     if request.method == 'POST':
 514         form = forms.ObjectSetsForm(book, request.user, request.POST)
 515         if form.is_valid():
 516             old_shelves = list(book.tags.filter(category='set'))
 517             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 518
 519             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 520                 touch_tag(shelf)
 521
 522             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 523                 touch_tag(shelf)
 524
 525             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 526             if request.is_ajax():
 527                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 528             else:
 529                 return HttpResponseRedirect('/')
 530     else:
 531         form = forms.ObjectSetsForm(book, request.user)
 532         new_set_form = forms.NewSetForm()
 533
 534     return render_to_response('catalogue/book_sets.html', locals(),
 535         context_instance=RequestContext(request))
 536
 537
 538 @login_required
 539 @require_POST
 540 @cache.never_cache
 541 def remove_from_shelf(request, shelf, slug):
 542     book = get_object_or_404(models.Book, slug=slug)
 543
 544     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 545
 546     if shelf in book.tags:
 547         models.Tag.objects.remove_tag(book, shelf)
 548         touch_tag(shelf)
 549
 550         return HttpResponse(_('Book was successfully removed from the shelf'))
 551     else:
 552         return HttpResponse(_('This book is not on the shelf'))
 553
 554
 555 def collect_books(books):
 556     """
 557     Returns all real books in collection.
 558     """
 559     result = []
 560     for book in books:
 561         if len(book.children.all()) == 0:
 562             result.append(book)
 563         else:
 564             result += collect_books(book.children.all())
 565     return result
 566
 567
 568 @cache.never_cache
 569 def download_shelf(request, slug):
 570     """"
 571     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 572     without loading the whole file into memory. A similar approach can
 573     be used for large dynamic PDF files.
 574     """
 575     from slughifi import slughifi
 576     import tempfile
 577     import zipfile
 578
 579     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 580
 581     formats = []
 582     form = forms.DownloadFormatsForm(request.GET)
 583     if form.is_valid():
 584         formats = form.cleaned_data['formats']
 585     if len(formats) == 0:
 586         formats = models.Book.ebook_formats
 587
 588     # Create a ZIP archive
 589     temp = tempfile.TemporaryFile()
 590     archive = zipfile.ZipFile(temp, 'w')
 591
 592     for book in collect_books(models.Book.tagged.with_all(shelf)):
 593         for ebook_format in models.Book.ebook_formats:
 594             if ebook_format in formats and book.has_media(ebook_format):
 595                 filename = book.get_media(ebook_format).path
 596                 archive.write(filename, str('%s.%s' % (book.slug, ebook_format)))
 597     archive.close()
 598
 599     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 600     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 601     response['Content-Length'] = temp.tell()
 602
 603     temp.seek(0)
 604     response.write(temp.read())
 605     return response
 606
 607
 608 @cache.never_cache
 609 def shelf_book_formats(request, shelf):
 610     """"
 611     Returns a list of formats of books in shelf.
 612     """
 613     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 614
 615     formats = {}
 616     for ebook_format in models.Book.ebook_formats:
 617         formats[ebook_format] = False
 618
 619     for book in collect_books(models.Book.tagged.with_all(shelf)):
 620         for ebook_format in models.Book.ebook_formats:
 621             if book.has_media(ebook_format):
 622                 formats[ebook_format] = True
 623
 624     return HttpResponse(LazyEncoder().encode(formats))
 625
 626
 627 @login_required
 628 @require_POST
 629 @cache.never_cache
 630 def new_set(request):
 631     new_set_form = forms.NewSetForm(request.POST)
 632     if new_set_form.is_valid():
 633         new_set = new_set_form.save(request.user)
 634
 635         if request.is_ajax():
 636             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 637         else:
 638             return HttpResponseRedirect('/')
 639
 640     return HttpResponseRedirect('/')
 641
 642
 643 @login_required
 644 @require_POST
 645 @cache.never_cache
 646 def delete_shelf(request, slug):
 647     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 648     user_set.delete()
 649
 650     if request.is_ajax():
 651         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 652     else:
 653         return HttpResponseRedirect('/')
 654
 655
 656 # =========
 657 # = Admin =
 658 # =========
 659 @login_required
 660 @staff_required
 661 def import_book(request):
 662     """docstring for import_book"""
 663     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 664     if book_import_form.is_valid():
 665         try:
 666             book_import_form.save()
 667         except:
 668             import sys
 669             import pprint
 670             import traceback
 671             info = sys.exc_info()
 672             exception = pprint.pformat(info[1])
 673             tb = '\n'.join(traceback.format_tb(info[2]))
 674             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 675         return HttpResponse(_("Book imported successfully"))
 676     else:
 677         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 678
 679
 680 # info views for API
 681
 682 def book_info(request, id, lang='pl'):
 683     book = get_object_or_404(models.Book, id=id)
 684     # set language by hand
 685     translation.activate(lang)
 686     return render_to_response('catalogue/book_info.html', locals(),
 687         context_instance=RequestContext(request))
 688
 689
 690 def tag_info(request, id):
 691     tag = get_object_or_404(models.Tag, id=id)
 692     return HttpResponse(tag.description)
 693
 694
 695 def download_zip(request, format, slug=None):
 696     url = None
 697     if format in models.Book.ebook_formats:
 698         url = models.Book.zip_format(format)
 699     elif format in ('mp3', 'ogg') and slug is not None:
 700         book = get_object_or_404(models.Book, slug=slug)
 701         url = book.zip_audiobooks(format)
 702     else:
 703         raise Http404('No format specified for zip package')
 704     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 705
 706
 707 def download_custom_pdf(request, slug):
 708     book = get_object_or_404(models.Book, slug=slug)
 709
 710     if request.method == 'GET':
 711         form = forms.CustomPDFForm(request.GET)
 712         if form.is_valid():
 713             cust = form.customizations
 714             pdf_file = models.get_customized_pdf_path(book, cust)
 715
 716             if not path.exists(pdf_file):
 717                 result = async_build_pdf.delay(book.id, cust, pdf_file)
 718                 result.wait()
 719             return AttachmentHttpResponse(file_name=("%s.pdf" % book.slug), file_path=pdf_file, mimetype="application/pdf")
 720         else:
 721             raise Http404(_('Incorrect customization options for PDF'))
 722     else:
 723         raise Http404(_('Bad method'))