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 import simplejson
  21 from django.utils.functional import Promise
  22 from django.utils.encoding import force_unicode
  23 from django.utils.http import urlquote_plus
  24 from django.views.decorators import cache
  25 from django.utils import translation
  26 from django.utils.translation import ugettext as _
  27 from django.views.generic.list_detail import object_list
  28
  29 from catalogue import models
  30 from catalogue import forms
  31 from catalogue.utils import split_tags
  32 from pdcounter import models as pdcounter_models
  33 from pdcounter import views as pdcounter_views
  34 from suggest.forms import PublishingSuggestForm
  35
  36
  37 staff_required = user_passes_test(lambda user: user.is_staff)
  38
  39
  40 class LazyEncoder(simplejson.JSONEncoder):
  41     def default(self, obj):
  42         if isinstance(obj, Promise):
  43             return force_unicode(obj)
  44         return obj
  45
  46 # shortcut for JSON reponses
  47 class JSONResponse(HttpResponse):
  48     def __init__(self, data={}, callback=None, **kwargs):
  49         # get rid of mimetype
  50         kwargs.pop('mimetype', None)
  51         data = simplejson.dumps(data)
  52         if callback:
  53             data = callback + "(" + data + ");"
  54         super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
  55
  56
  57 def main_page(request):
  58     if request.user.is_authenticated():
  59         shelves = models.Tag.objects.filter(category='set', user=request.user)
  60         new_set_form = forms.NewSetForm()
  61
  62     tags = models.Tag.objects.exclude(category__in=('set', 'book'))
  63     for tag in tags:
  64         tag.count = tag.get_count()
  65     categories = split_tags(tags)
  66     fragment_tags = categories.get('theme', [])
  67
  68     form = forms.SearchForm()
  69     return render_to_response('catalogue/main_page.html', locals(),
  70         context_instance=RequestContext(request))
  71
  72
  73 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  74     """ generates a listing of all books, optionally filtered with a test function """
  75
  76     form = forms.SearchForm()
  77
  78     books_by_author, orphans, books_by_parent = models.Book.book_list(filter)
  79     books_nav = SortedDict()
  80     for tag in books_by_author:
  81         if books_by_author[tag]:
  82             books_nav.setdefault(tag.sort_key[0], []).append(tag)
  83
  84     return render_to_response(template_name, locals(),
  85         context_instance=RequestContext(request))
  86
  87
  88 def audiobook_list(request):
  89     return book_list(request, Q(media__type='mp3') | Q(media__type='ogg'),
  90                      template_name='catalogue/audiobook_list.html')
  91
  92
  93 def daisy_list(request):
  94     return book_list(request, Q(media__type='daisy'),
  95                      template_name='catalogue/daisy_list.html')
  96
  97
  98 def differentiate_tags(request, tags, ambiguous_slugs):
  99     beginning = '/'.join(tag.url_chunk for tag in tags)
 100     unparsed = '/'.join(ambiguous_slugs[1:])
 101     options = []
 102     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 103         options.append({
 104             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 105             'tags': [tag]
 106         })
 107     return render_to_response('catalogue/differentiate_tags.html',
 108                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 109                 context_instance=RequestContext(request))
 110
 111
 112 def tagged_object_list(request, tags=''):
 113     try:
 114         tags = models.Tag.get_tag_list(tags)
 115     except models.Tag.DoesNotExist:
 116         chunks = tags.split('/')
 117         if len(chunks) == 2 and chunks[0] == 'autor':
 118             return pdcounter_views.author_detail(request, chunks[1])
 119         else:
 120             raise Http404
 121     except models.Tag.MultipleObjectsReturned, e:
 122         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 123     except models.Tag.UrlDeprecationWarning, e:
 124         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 125
 126     try:
 127         if len(tags) > settings.MAX_TAG_LIST:
 128             raise Http404
 129     except AttributeError:
 130         pass
 131
 132     if len([tag for tag in tags if tag.category == 'book']):
 133         raise Http404
 134
 135     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 136     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 137     only_shelf = shelf_is_set and len(tags) == 1
 138     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 139
 140     objects = only_author = None
 141     categories = {}
 142
 143     if theme_is_set:
 144         shelf_tags = [tag for tag in tags if tag.category == 'set']
 145         fragment_tags = [tag for tag in tags if tag.category != 'set']
 146         fragments = models.Fragment.tagged.with_all(fragment_tags)
 147
 148         if shelf_tags:
 149             books = models.Book.tagged.with_all(shelf_tags).order_by()
 150             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 151             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 152
 153         # newtagging goes crazy if we just try:
 154         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 155         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 156         fragment_keys = [fragment.pk for fragment in fragments]
 157         if fragment_keys:
 158             related_tags = models.Fragment.tags.usage(counts=True,
 159                                 filters={'pk__in': fragment_keys},
 160                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 161             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 162             categories = split_tags(related_tags)
 163
 164             objects = fragments
 165     else:
 166         if shelf_is_set:
 167             objects = models.Book.tagged.with_all(tags)
 168         else:
 169             objects = models.Book.tagged_top_level(tags)
 170
 171         # get related tags from `tag_counter` and `theme_counter`
 172         related_counts = {}
 173         tags_pks = [tag.pk for tag in tags]
 174         for book in objects:
 175             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 176                 if tag_pk in tags_pks:
 177                     continue
 178                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 179         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 180         related_tags = [tag for tag in related_tags if tag not in tags]
 181         for tag in related_tags:
 182             tag.count = related_counts[tag.pk]
 183
 184         categories = split_tags(related_tags)
 185         del related_tags
 186
 187     if not objects:
 188         only_author = len(tags) == 1 and tags[0].category == 'author'
 189         objects = models.Book.objects.none()
 190
 191     return object_list(
 192         request,
 193         objects,
 194         template_name='catalogue/tagged_object_list.html',
 195         extra_context={
 196             'categories': categories,
 197             'only_shelf': only_shelf,
 198             'only_author': only_author,
 199             'only_my_shelf': only_my_shelf,
 200             'formats_form': forms.DownloadFormatsForm(),
 201             'tags': tags,
 202         }
 203     )
 204
 205
 206 def book_fragments(request, book_slug, theme_slug):
 207     book = get_object_or_404(models.Book, slug=book_slug)
 208     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 209     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 210     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 211
 212     form = forms.SearchForm()
 213     return render_to_response('catalogue/book_fragments.html', locals(),
 214         context_instance=RequestContext(request))
 215
 216
 217 def book_detail(request, slug):
 218     try:
 219         book = models.Book.objects.get(slug=slug)
 220     except models.Book.DoesNotExist:
 221         return pdcounter_views.book_stub_detail(request, slug)
 222
 223     book_tag = book.book_tag()
 224     tags = list(book.tags.filter(~Q(category='set')))
 225     categories = split_tags(tags)
 226     book_children = book.children.all().order_by('parent_number', 'sort_key')
 227
 228     _book = book
 229     parents = []
 230     while _book.parent:
 231         parents.append(_book.parent)
 232         _book = _book.parent
 233     parents = reversed(parents)
 234
 235     theme_counter = book.theme_counter
 236     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 237     for tag in book_themes:
 238         tag.count = theme_counter[tag.pk]
 239
 240     extra_info = book.get_extra_info_value()
 241     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 242
 243     projects = set()
 244     for m in book.media.filter(type='mp3'):
 245         # ogg files are always from the same project
 246         meta = m.get_extra_info_value()
 247         project = meta.get('project')
 248         if not project:
 249             # temporary fallback
 250             project = u'CzytamySłuchając'
 251
 252         projects.add((project, meta.get('funded_by', '')))
 253     projects = sorted(projects)
 254
 255     form = forms.SearchForm()
 256     return render_to_response('catalogue/book_detail.html', locals(),
 257         context_instance=RequestContext(request))
 258
 259
 260 def book_text(request, slug):
 261     book = get_object_or_404(models.Book, slug=slug)
 262     if not book.has_html_file():
 263         raise Http404
 264     book_themes = {}
 265     for fragment in book.fragments.all():
 266         for theme in fragment.tags.filter(category='theme'):
 267             book_themes.setdefault(theme, []).append(fragment)
 268
 269     book_themes = book_themes.items()
 270     book_themes.sort(key=lambda s: s[0].sort_key)
 271     return render_to_response('catalogue/book_text.html', locals(),
 272         context_instance=RequestContext(request))
 273
 274
 275 # ==========
 276 # = Search =
 277 # ==========
 278
 279 def _no_diacritics_regexp(query):
 280     """ returns a regexp for searching for a query without diacritics
 281
 282     should be locale-aware """
 283     names = {
 284         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',
 285         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'
 286         }
 287     def repl(m):
 288         l = m.group()
 289         return u"(%s)" % '|'.join(names[l])
 290     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 291
 292 def unicode_re_escape(query):
 293     """ Unicode-friendly version of re.escape """
 294     return re.sub('(?u)(\W)', r'\\\1', query)
 295
 296 def _word_starts_with(name, prefix):
 297     """returns a Q object getting models having `name` contain a word
 298     starting with `prefix`
 299
 300     We define word characters as alphanumeric and underscore, like in JS.
 301
 302     Works for MySQL, PostgreSQL, Oracle.
 303     For SQLite, _sqlite* version is substituted for this.
 304     """
 305     kwargs = {}
 306
 307     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 308     # can't use [[:<:]] (word start),
 309     # but we want both `xy` and `(xy` to catch `(xyz)`
 310     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 311
 312     return Q(**kwargs)
 313
 314
 315 def _word_starts_with_regexp(prefix):
 316     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 317     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 318
 319
 320 def _sqlite_word_starts_with(name, prefix):
 321     """ version of _word_starts_with for SQLite
 322
 323     SQLite in Django uses Python re module
 324     """
 325     kwargs = {}
 326     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 327     return Q(**kwargs)
 328
 329
 330 if hasattr(settings, 'DATABASES'):
 331     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 332         _word_starts_with = _sqlite_word_starts_with
 333 elif settings.DATABASE_ENGINE == 'sqlite3':
 334     _word_starts_with = _sqlite_word_starts_with
 335
 336
 337 class App():
 338     def __init__(self, name, view):
 339         self.name = name
 340         self._view = view
 341         self.lower = name.lower()
 342         self.category = 'application'
 343     def view(self):
 344         return reverse(*self._view)
 345
 346 _apps = (
 347     App(u'Leśmianator', (u'lesmianator', )),
 348     )
 349
 350
 351 def _tags_starting_with(prefix, user=None):
 352     prefix = prefix.lower()
 353     # PD counter
 354     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 355     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 356
 357     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 358     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 359     if user and user.is_authenticated():
 360         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 361     else:
 362         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 363
 364     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 365     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 366
 367
 368 def _get_result_link(match, tag_list):
 369     if isinstance(match, models.Tag):
 370         return reverse('catalogue.views.tagged_object_list',
 371             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 372         )
 373     elif isinstance(match, App):
 374         return match.view()
 375     else:
 376         return match.get_absolute_url()
 377
 378
 379 def _get_result_type(match):
 380     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 381         type = 'book'
 382     else:
 383         type = match.category
 384     return type
 385
 386
 387 def books_starting_with(prefix):
 388     prefix = prefix.lower()
 389     return models.Book.objects.filter(_word_starts_with('title', prefix))
 390
 391
 392 def find_best_matches(query, user=None):
 393     """ Finds a Book, Tag, BookStub or Author best matching a query.
 394
 395     Returns a with:
 396       - zero elements when nothing is found,
 397       - one element when a best result is found,
 398       - more then one element on multiple exact matches
 399
 400     Raises a ValueError on too short a query.
 401     """
 402
 403     query = query.lower()
 404     if len(query) < 2:
 405         raise ValueError("query must have at least two characters")
 406
 407     result = tuple(_tags_starting_with(query, user))
 408     # remove pdcounter stuff
 409     book_titles = set(match.pretty_title().lower() for match in result
 410                       if isinstance(match, models.Book))
 411     authors = set(match.name.lower() for match in result
 412                   if isinstance(match, models.Tag) and match.category=='author')
 413     result = tuple(res for res in result if not (
 414                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 415                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 416              ))
 417
 418     exact_matches = tuple(res for res in result if res.name.lower() == query)
 419     if exact_matches:
 420         return exact_matches
 421     else:
 422         return tuple(result)[:1]
 423
 424
 425 def search(request):
 426     tags = request.GET.get('tags', '')
 427     prefix = request.GET.get('q', '')
 428
 429     try:
 430         tag_list = models.Tag.get_tag_list(tags)
 431     except:
 432         tag_list = []
 433
 434     try:
 435         result = find_best_matches(prefix, request.user)
 436     except ValueError:
 437         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 438             context_instance=RequestContext(request))
 439
 440     if len(result) == 1:
 441         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 442     elif len(result) > 1:
 443         return render_to_response('catalogue/search_multiple_hits.html',
 444             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 445             context_instance=RequestContext(request))
 446     else:
 447         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 448         return render_to_response('catalogue/search_no_hits.html',
 449             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 450             context_instance=RequestContext(request))
 451
 452
 453 def tags_starting_with(request):
 454     prefix = request.GET.get('q', '')
 455     # Prefix must have at least 2 characters
 456     if len(prefix) < 2:
 457         return HttpResponse('')
 458     tags_list = []
 459     result = ""
 460     for tag in _tags_starting_with(prefix, request.user):
 461         if not tag.name in tags_list:
 462             result += "\n" + tag.name
 463             tags_list.append(tag.name)
 464     return HttpResponse(result)
 465
 466 def json_tags_starting_with(request, callback=None):
 467     # Callback for JSONP
 468     prefix = request.GET.get('q', '')
 469     callback = request.GET.get('callback', '')
 470     # Prefix must have at least 2 characters
 471     if len(prefix) < 2:
 472         return HttpResponse('')
 473     tags_list = []
 474     for tag in _tags_starting_with(prefix, request.user):
 475         if not tag.name in tags_list:
 476             tags_list.append(tag.name)
 477     if request.GET.get('mozhint', ''):
 478         result = [prefix, tags_list]
 479     else:
 480         result = {"matches": tags_list}
 481     return JSONResponse(result, callback)
 482
 483 # ====================
 484 # = Shelf management =
 485 # ====================
 486 @login_required
 487 @cache.never_cache
 488 def user_shelves(request):
 489     shelves = models.Tag.objects.filter(category='set', user=request.user)
 490     new_set_form = forms.NewSetForm()
 491     return render_to_response('catalogue/user_shelves.html', locals(),
 492             context_instance=RequestContext(request))
 493
 494 @cache.never_cache
 495 def book_sets(request, slug):
 496     if not request.user.is_authenticated():
 497         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 498
 499     book = get_object_or_404(models.Book, slug=slug)
 500     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 501     book_sets = book.tags.filter(category='set', user=request.user)
 502
 503     if request.method == 'POST':
 504         form = forms.ObjectSetsForm(book, request.user, request.POST)
 505         if form.is_valid():
 506             old_shelves = list(book.tags.filter(category='set'))
 507             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 508
 509             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 510                 shelf.book_count = None
 511                 shelf.save()
 512
 513             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 514                 shelf.book_count = None
 515                 shelf.save()
 516
 517             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 518             if request.is_ajax():
 519                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 520             else:
 521                 return HttpResponseRedirect('/')
 522     else:
 523         form = forms.ObjectSetsForm(book, request.user)
 524         new_set_form = forms.NewSetForm()
 525
 526     return render_to_response('catalogue/book_sets.html', locals(),
 527         context_instance=RequestContext(request))
 528
 529
 530 @login_required
 531 @require_POST
 532 @cache.never_cache
 533 def remove_from_shelf(request, shelf, book):
 534     book = get_object_or_404(models.Book, slug=book)
 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
 540         shelf.book_count = None
 541         shelf.save()
 542
 543         return HttpResponse(_('Book was successfully removed from the shelf'))
 544     else:
 545         return HttpResponse(_('This book is not on the shelf'))
 546
 547
 548 def collect_books(books):
 549     """
 550     Returns all real books in collection.
 551     """
 552     result = []
 553     for book in books:
 554         if len(book.children.all()) == 0:
 555             result.append(book)
 556         else:
 557             result += collect_books(book.children.all())
 558     return result
 559
 560
 561 @cache.never_cache
 562 def download_shelf(request, slug):
 563     """"
 564     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 565     without loading the whole file into memory. A similar approach can
 566     be used for large dynamic PDF files.
 567     """
 568     from slughifi import slughifi
 569     import tempfile
 570     import zipfile
 571
 572     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 573
 574     formats = []
 575     form = forms.DownloadFormatsForm(request.GET)
 576     if form.is_valid():
 577         formats = form.cleaned_data['formats']
 578     if len(formats) == 0:
 579         formats = ['pdf', 'epub', 'mobi', 'odt', 'txt']
 580
 581     # Create a ZIP archive
 582     temp = tempfile.TemporaryFile()
 583     archive = zipfile.ZipFile(temp, 'w')
 584
 585     already = set()
 586     for book in collect_books(models.Book.tagged.with_all(shelf)):
 587         if 'pdf' in formats and book.pdf_file:
 588             filename = book.pdf_file.path
 589             archive.write(filename, str('%s.pdf' % book.slug))
 590         if 'mobi' in formats and book.mobi_file:
 591             filename = book.mobi_file.path
 592             archive.write(filename, str('%s.mobi' % book.slug))
 593         if book.root_ancestor not in already and 'epub' in formats and book.root_ancestor.epub_file:
 594             filename = book.root_ancestor.epub_file.path
 595             archive.write(filename, str('%s.epub' % book.root_ancestor.slug))
 596             already.add(book.root_ancestor)
 597         if 'odt' in formats and book.has_media("odt"):
 598             for file in book.get_media("odt"):
 599                 filename = file.file.path
 600                 archive.write(filename, str('%s.odt' % slughifi(file.name)))
 601         if 'txt' in formats and book.txt_file:
 602             filename = book.txt_file.path
 603             archive.write(filename, str('%s.txt' % book.slug))
 604     archive.close()
 605
 606     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 607     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 608     response['Content-Length'] = temp.tell()
 609
 610     temp.seek(0)
 611     response.write(temp.read())
 612     return response
 613
 614
 615 @cache.never_cache
 616 def shelf_book_formats(request, shelf):
 617     """"
 618     Returns a list of formats of books in shelf.
 619     """
 620     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 621
 622     formats = {'pdf': False, 'epub': False, 'mobi': False, 'odt': False, 'txt': False}
 623
 624     for book in collect_books(models.Book.tagged.with_all(shelf)):
 625         if book.pdf_file:
 626             formats['pdf'] = True
 627         if book.root_ancestor.epub_file:
 628             formats['epub'] = True
 629         if book.mobi_file:
 630             formats['mobi'] = True
 631         if book.txt_file:
 632             formats['txt'] = True
 633         for format in ('odt',):
 634             if book.has_media(format):
 635                 formats[format] = True
 636
 637     return HttpResponse(LazyEncoder().encode(formats))
 638
 639
 640 @login_required
 641 @require_POST
 642 @cache.never_cache
 643 def new_set(request):
 644     new_set_form = forms.NewSetForm(request.POST)
 645     if new_set_form.is_valid():
 646         new_set = new_set_form.save(request.user)
 647
 648         if request.is_ajax():
 649             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 650         else:
 651             return HttpResponseRedirect('/')
 652
 653     return HttpResponseRedirect('/')
 654
 655
 656 @login_required
 657 @require_POST
 658 @cache.never_cache
 659 def delete_shelf(request, slug):
 660     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 661     user_set.delete()
 662
 663     if request.is_ajax():
 664         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 665     else:
 666         return HttpResponseRedirect('/')
 667
 668
 669 # ==================
 670 # = Authentication =
 671 # ==================
 672 @require_POST
 673 @cache.never_cache
 674 def login(request):
 675     form = AuthenticationForm(data=request.POST, prefix='login')
 676     if form.is_valid():
 677         auth.login(request, form.get_user())
 678         response_data = {'success': True, 'errors': {}}
 679     else:
 680         response_data = {'success': False, 'errors': form.errors}
 681     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 682
 683
 684 @require_POST
 685 @cache.never_cache
 686 def register(request):
 687     registration_form = UserCreationForm(request.POST, prefix='registration')
 688     if registration_form.is_valid():
 689         user = registration_form.save()
 690         user = auth.authenticate(
 691             username=registration_form.cleaned_data['username'],
 692             password=registration_form.cleaned_data['password1']
 693         )
 694         auth.login(request, user)
 695         response_data = {'success': True, 'errors': {}}
 696     else:
 697         response_data = {'success': False, 'errors': registration_form.errors}
 698     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 699
 700
 701 @cache.never_cache
 702 def logout_then_redirect(request):
 703     auth.logout(request)
 704     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 705
 706
 707
 708 # =========
 709 # = Admin =
 710 # =========
 711 @login_required
 712 @staff_required
 713 def import_book(request):
 714     """docstring for import_book"""
 715     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 716     if book_import_form.is_valid():
 717         try:
 718             book_import_form.save()
 719         except:
 720             import sys
 721             import pprint
 722             import traceback
 723             info = sys.exc_info()
 724             exception = pprint.pformat(info[1])
 725             tb = '\n'.join(traceback.format_tb(info[2]))
 726             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 727         return HttpResponse(_("Book imported successfully"))
 728     else:
 729         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 730
 731
 732
 733 def clock(request):
 734     """ Provides server time for jquery.countdown,
 735     in a format suitable for Date.parse()
 736     """
 737     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))
 738
 739
 740 # info views for API
 741
 742 def book_info(request, id, lang='pl'):
 743     book = get_object_or_404(models.Book, id=id)
 744     # set language by hand
 745     translation.activate(lang)
 746     return render_to_response('catalogue/book_info.html', locals(),
 747         context_instance=RequestContext(request))
 748
 749
 750 def tag_info(request, id):
 751     tag = get_object_or_404(models.Tag, id=id)
 752     return HttpResponse(tag.description)
 753
 754
 755 def download_zip(request, format, slug):
 756     url = None
 757     if format in ('pdf', 'epub', 'mobi'):
 758         url = models.Book.zip_format(format)
 759     elif format == 'audiobook' and slug is not None:
 760         book = models.Book.objects.get(slug=slug)
 761         url = book.zip_audiobooks()
 762     else:
 763         raise Http404('No format specified for zip package')
 764     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))