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