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         context=None):
  75     """ generates a listing of all books, optionally filtered with a test function """
  76
  77     form = forms.SearchForm()
  78
  79     books_by_author, orphans, books_by_parent = models.Book.book_list(filter)
  80     books_nav = SortedDict()
  81     for tag in books_by_author:
  82         if books_by_author[tag]:
  83             books_nav.setdefault(tag.sort_key[0], []).append(tag)
  84
  85     return render_to_response(template_name, locals(),
  86         context_instance=RequestContext(request))
  87
  88
  89 def audiobook_list(request):
  90     return book_list(request, Q(media__type='mp3') | Q(media__type='ogg'),
  91                      template_name='catalogue/audiobook_list.html')
  92
  93
  94 def daisy_list(request):
  95     return book_list(request, Q(media__type='daisy'),
  96                      template_name='catalogue/daisy_list.html')
  97
  98
  99 def collection(request, slug):
 100     coll = get_object_or_404(models.Collection, slug=slug)
 101     slugs = coll.book_slugs.split()
 102     # allow URIs
 103     slugs = [slug.rstrip('/').rsplit('/', 1)[-1] if '/' in slug else slug
 104                 for slug in slugs]
 105     return book_list(request, Q(slug__in=slugs),
 106                      template_name='catalogue/collection.html',
 107                      context={'collection': coll})
 108
 109
 110 def differentiate_tags(request, tags, ambiguous_slugs):
 111     beginning = '/'.join(tag.url_chunk for tag in tags)
 112     unparsed = '/'.join(ambiguous_slugs[1:])
 113     options = []
 114     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 115         options.append({
 116             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 117             'tags': [tag]
 118         })
 119     return render_to_response('catalogue/differentiate_tags.html',
 120                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 121                 context_instance=RequestContext(request))
 122
 123
 124 def tagged_object_list(request, tags=''):
 125     try:
 126         tags = models.Tag.get_tag_list(tags)
 127     except models.Tag.DoesNotExist:
 128         chunks = tags.split('/')
 129         if len(chunks) == 2 and chunks[0] == 'autor':
 130             return pdcounter_views.author_detail(request, chunks[1])
 131         else:
 132             raise Http404
 133     except models.Tag.MultipleObjectsReturned, e:
 134         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 135     except models.Tag.UrlDeprecationWarning, e:
 136         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 137
 138     try:
 139         if len(tags) > settings.MAX_TAG_LIST:
 140             raise Http404
 141     except AttributeError:
 142         pass
 143
 144     if len([tag for tag in tags if tag.category == 'book']):
 145         raise Http404
 146
 147     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 148     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 149     only_shelf = shelf_is_set and len(tags) == 1
 150     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 151
 152     objects = only_author = None
 153     categories = {}
 154
 155     if theme_is_set:
 156         shelf_tags = [tag for tag in tags if tag.category == 'set']
 157         fragment_tags = [tag for tag in tags if tag.category != 'set']
 158         fragments = models.Fragment.tagged.with_all(fragment_tags)
 159
 160         if shelf_tags:
 161             books = models.Book.tagged.with_all(shelf_tags).order_by()
 162             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 163             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 164
 165         # newtagging goes crazy if we just try:
 166         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 167         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 168         fragment_keys = [fragment.pk for fragment in fragments]
 169         if fragment_keys:
 170             related_tags = models.Fragment.tags.usage(counts=True,
 171                                 filters={'pk__in': fragment_keys},
 172                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 173             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 174             categories = split_tags(related_tags)
 175
 176             objects = fragments
 177     else:
 178         if shelf_is_set:
 179             objects = models.Book.tagged.with_all(tags)
 180         else:
 181             objects = models.Book.tagged_top_level(tags)
 182
 183         # get related tags from `tag_counter` and `theme_counter`
 184         related_counts = {}
 185         tags_pks = [tag.pk for tag in tags]
 186         for book in objects:
 187             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 188                 if tag_pk in tags_pks:
 189                     continue
 190                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 191         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 192         related_tags = [tag for tag in related_tags if tag not in tags]
 193         for tag in related_tags:
 194             tag.count = related_counts[tag.pk]
 195
 196         categories = split_tags(related_tags)
 197         del related_tags
 198
 199     if not objects:
 200         only_author = len(tags) == 1 and tags[0].category == 'author'
 201         objects = models.Book.objects.none()
 202
 203     return object_list(
 204         request,
 205         objects,
 206         template_name='catalogue/tagged_object_list.html',
 207         extra_context={
 208             'categories': categories,
 209             'only_shelf': only_shelf,
 210             'only_author': only_author,
 211             'only_my_shelf': only_my_shelf,
 212             'formats_form': forms.DownloadFormatsForm(),
 213             'tags': tags,
 214         }
 215     )
 216
 217
 218 def book_fragments(request, book_slug, theme_slug):
 219     book = get_object_or_404(models.Book, slug=book_slug)
 220     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 221     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 222     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 223
 224     form = forms.SearchForm()
 225     return render_to_response('catalogue/book_fragments.html', locals(),
 226         context_instance=RequestContext(request))
 227
 228
 229 def book_detail(request, slug):
 230     try:
 231         book = models.Book.objects.get(slug=slug)
 232     except models.Book.DoesNotExist:
 233         return pdcounter_views.book_stub_detail(request, slug)
 234
 235     book_tag = book.book_tag()
 236     tags = list(book.tags.filter(~Q(category='set')))
 237     categories = split_tags(tags)
 238     book_children = book.children.all().order_by('parent_number', 'sort_key')
 239
 240     _book = book
 241     parents = []
 242     while _book.parent:
 243         parents.append(_book.parent)
 244         _book = _book.parent
 245     parents = reversed(parents)
 246
 247     theme_counter = book.theme_counter
 248     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 249     for tag in book_themes:
 250         tag.count = theme_counter[tag.pk]
 251
 252     extra_info = book.get_extra_info_value()
 253     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 254
 255     projects = set()
 256     for m in book.media.filter(type='mp3'):
 257         # ogg files are always from the same project
 258         meta = m.get_extra_info_value()
 259         project = meta.get('project')
 260         if not project:
 261             # temporary fallback
 262             project = u'CzytamySłuchając'
 263
 264         projects.add((project, meta.get('funded_by', '')))
 265     projects = sorted(projects)
 266
 267     form = forms.SearchForm()
 268     return render_to_response('catalogue/book_detail.html', locals(),
 269         context_instance=RequestContext(request))
 270
 271
 272 def book_text(request, slug):
 273     book = get_object_or_404(models.Book, slug=slug)
 274     if not book.has_html_file():
 275         raise Http404
 276     book_themes = {}
 277     for fragment in book.fragments.all():
 278         for theme in fragment.tags.filter(category='theme'):
 279             book_themes.setdefault(theme, []).append(fragment)
 280
 281     book_themes = book_themes.items()
 282     book_themes.sort(key=lambda s: s[0].sort_key)
 283     return render_to_response('catalogue/book_text.html', locals(),
 284         context_instance=RequestContext(request))
 285
 286
 287 # ==========
 288 # = Search =
 289 # ==========
 290
 291 def _no_diacritics_regexp(query):
 292     """ returns a regexp for searching for a query without diacritics
 293
 294     should be locale-aware """
 295     names = {
 296         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',
 297         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'
 298         }
 299     def repl(m):
 300         l = m.group()
 301         return u"(%s)" % '|'.join(names[l])
 302     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 303
 304 def unicode_re_escape(query):
 305     """ Unicode-friendly version of re.escape """
 306     return re.sub('(?u)(\W)', r'\\\1', query)
 307
 308 def _word_starts_with(name, prefix):
 309     """returns a Q object getting models having `name` contain a word
 310     starting with `prefix`
 311
 312     We define word characters as alphanumeric and underscore, like in JS.
 313
 314     Works for MySQL, PostgreSQL, Oracle.
 315     For SQLite, _sqlite* version is substituted for this.
 316     """
 317     kwargs = {}
 318
 319     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 320     # can't use [[:<:]] (word start),
 321     # but we want both `xy` and `(xy` to catch `(xyz)`
 322     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 323
 324     return Q(**kwargs)
 325
 326
 327 def _word_starts_with_regexp(prefix):
 328     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 329     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 330
 331
 332 def _sqlite_word_starts_with(name, prefix):
 333     """ version of _word_starts_with for SQLite
 334
 335     SQLite in Django uses Python re module
 336     """
 337     kwargs = {}
 338     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 339     return Q(**kwargs)
 340
 341
 342 if hasattr(settings, 'DATABASES'):
 343     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 344         _word_starts_with = _sqlite_word_starts_with
 345 elif settings.DATABASE_ENGINE == 'sqlite3':
 346     _word_starts_with = _sqlite_word_starts_with
 347
 348
 349 class App():
 350     def __init__(self, name, view):
 351         self.name = name
 352         self._view = view
 353         self.lower = name.lower()
 354         self.category = 'application'
 355     def view(self):
 356         return reverse(*self._view)
 357
 358 _apps = (
 359     App(u'Leśmianator', (u'lesmianator', )),
 360     )
 361
 362
 363 def _tags_starting_with(prefix, user=None):
 364     prefix = prefix.lower()
 365     # PD counter
 366     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 367     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 368
 369     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 370     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 371     if user and user.is_authenticated():
 372         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 373     else:
 374         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 375
 376     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 377     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 378
 379
 380 def _get_result_link(match, tag_list):
 381     if isinstance(match, models.Tag):
 382         return reverse('catalogue.views.tagged_object_list',
 383             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 384         )
 385     elif isinstance(match, App):
 386         return match.view()
 387     else:
 388         return match.get_absolute_url()
 389
 390
 391 def _get_result_type(match):
 392     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 393         type = 'book'
 394     else:
 395         type = match.category
 396     return type
 397
 398
 399 def books_starting_with(prefix):
 400     prefix = prefix.lower()
 401     return models.Book.objects.filter(_word_starts_with('title', prefix))
 402
 403
 404 def find_best_matches(query, user=None):
 405     """ Finds a Book, Tag, BookStub or Author best matching a query.
 406
 407     Returns a with:
 408       - zero elements when nothing is found,
 409       - one element when a best result is found,
 410       - more then one element on multiple exact matches
 411
 412     Raises a ValueError on too short a query.
 413     """
 414
 415     query = query.lower()
 416     if len(query) < 2:
 417         raise ValueError("query must have at least two characters")
 418
 419     result = tuple(_tags_starting_with(query, user))
 420     # remove pdcounter stuff
 421     book_titles = set(match.pretty_title().lower() for match in result
 422                       if isinstance(match, models.Book))
 423     authors = set(match.name.lower() for match in result
 424                   if isinstance(match, models.Tag) and match.category=='author')
 425     result = tuple(res for res in result if not (
 426                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 427                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 428              ))
 429
 430     exact_matches = tuple(res for res in result if res.name.lower() == query)
 431     if exact_matches:
 432         return exact_matches
 433     else:
 434         return tuple(result)[:1]
 435
 436
 437 def search(request):
 438     tags = request.GET.get('tags', '')
 439     prefix = request.GET.get('q', '')
 440
 441     try:
 442         tag_list = models.Tag.get_tag_list(tags)
 443     except:
 444         tag_list = []
 445
 446     try:
 447         result = find_best_matches(prefix, request.user)
 448     except ValueError:
 449         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 450             context_instance=RequestContext(request))
 451
 452     if len(result) == 1:
 453         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 454     elif len(result) > 1:
 455         return render_to_response('catalogue/search_multiple_hits.html',
 456             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 457             context_instance=RequestContext(request))
 458     else:
 459         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 460         return render_to_response('catalogue/search_no_hits.html',
 461             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 462             context_instance=RequestContext(request))
 463
 464
 465 def tags_starting_with(request):
 466     prefix = request.GET.get('q', '')
 467     # Prefix must have at least 2 characters
 468     if len(prefix) < 2:
 469         return HttpResponse('')
 470     tags_list = []
 471     result = ""
 472     for tag in _tags_starting_with(prefix, request.user):
 473         if not tag.name in tags_list:
 474             result += "\n" + tag.name
 475             tags_list.append(tag.name)
 476     return HttpResponse(result)
 477
 478 def json_tags_starting_with(request, callback=None):
 479     # Callback for JSONP
 480     prefix = request.GET.get('q', '')
 481     callback = request.GET.get('callback', '')
 482     # Prefix must have at least 2 characters
 483     if len(prefix) < 2:
 484         return HttpResponse('')
 485     tags_list = []
 486     for tag in _tags_starting_with(prefix, request.user):
 487         if not tag.name in tags_list:
 488             tags_list.append(tag.name)
 489     if request.GET.get('mozhint', ''):
 490         result = [prefix, tags_list]
 491     else:
 492         result = {"matches": tags_list}
 493     return JSONResponse(result, callback)
 494
 495 # ====================
 496 # = Shelf management =
 497 # ====================
 498 @login_required
 499 @cache.never_cache
 500 def user_shelves(request):
 501     shelves = models.Tag.objects.filter(category='set', user=request.user)
 502     new_set_form = forms.NewSetForm()
 503     return render_to_response('catalogue/user_shelves.html', locals(),
 504             context_instance=RequestContext(request))
 505
 506 @cache.never_cache
 507 def book_sets(request, slug):
 508     if not request.user.is_authenticated():
 509         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 510
 511     book = get_object_or_404(models.Book, slug=slug)
 512     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 513     book_sets = book.tags.filter(category='set', user=request.user)
 514
 515     if request.method == 'POST':
 516         form = forms.ObjectSetsForm(book, request.user, request.POST)
 517         if form.is_valid():
 518             old_shelves = list(book.tags.filter(category='set'))
 519             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 520
 521             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 522                 shelf.book_count = None
 523                 shelf.save()
 524
 525             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 526                 shelf.book_count = None
 527                 shelf.save()
 528
 529             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 530             if request.is_ajax():
 531                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 532             else:
 533                 return HttpResponseRedirect('/')
 534     else:
 535         form = forms.ObjectSetsForm(book, request.user)
 536         new_set_form = forms.NewSetForm()
 537
 538     return render_to_response('catalogue/book_sets.html', locals(),
 539         context_instance=RequestContext(request))
 540
 541
 542 @login_required
 543 @require_POST
 544 @cache.never_cache
 545 def remove_from_shelf(request, shelf, book):
 546     book = get_object_or_404(models.Book, slug=book)
 547     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 548
 549     if shelf in book.tags:
 550         models.Tag.objects.remove_tag(book, shelf)
 551
 552         shelf.book_count = None
 553         shelf.save()
 554
 555         return HttpResponse(_('Book was successfully removed from the shelf'))
 556     else:
 557         return HttpResponse(_('This book is not on the shelf'))
 558
 559
 560 def collect_books(books):
 561     """
 562     Returns all real books in collection.
 563     """
 564     result = []
 565     for book in books:
 566         if len(book.children.all()) == 0:
 567             result.append(book)
 568         else:
 569             result += collect_books(book.children.all())
 570     return result
 571
 572
 573 @cache.never_cache
 574 def download_shelf(request, slug):
 575     """"
 576     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 577     without loading the whole file into memory. A similar approach can
 578     be used for large dynamic PDF files.
 579     """
 580     from slughifi import slughifi
 581     import tempfile
 582     import zipfile
 583
 584     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 585
 586     formats = []
 587     form = forms.DownloadFormatsForm(request.GET)
 588     if form.is_valid():
 589         formats = form.cleaned_data['formats']
 590     if len(formats) == 0:
 591         formats = ['pdf', 'epub', 'mobi', 'odt', 'txt']
 592
 593     # Create a ZIP archive
 594     temp = tempfile.TemporaryFile()
 595     archive = zipfile.ZipFile(temp, 'w')
 596
 597     already = set()
 598     for book in collect_books(models.Book.tagged.with_all(shelf)):
 599         if 'pdf' in formats and book.pdf_file:
 600             filename = book.pdf_file.path
 601             archive.write(filename, str('%s.pdf' % book.slug))
 602         if 'mobi' in formats and book.mobi_file:
 603             filename = book.mobi_file.path
 604             archive.write(filename, str('%s.mobi' % book.slug))
 605         if book.root_ancestor not in already and 'epub' in formats and book.root_ancestor.epub_file:
 606             filename = book.root_ancestor.epub_file.path
 607             archive.write(filename, str('%s.epub' % book.root_ancestor.slug))
 608             already.add(book.root_ancestor)
 609         if 'odt' in formats and book.has_media("odt"):
 610             for file in book.get_media("odt"):
 611                 filename = file.file.path
 612                 archive.write(filename, str('%s.odt' % slughifi(file.name)))
 613         if 'txt' in formats and book.txt_file:
 614             filename = book.txt_file.path
 615             archive.write(filename, str('%s.txt' % book.slug))
 616     archive.close()
 617
 618     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 619     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 620     response['Content-Length'] = temp.tell()
 621
 622     temp.seek(0)
 623     response.write(temp.read())
 624     return response
 625
 626
 627 @cache.never_cache
 628 def shelf_book_formats(request, shelf):
 629     """"
 630     Returns a list of formats of books in shelf.
 631     """
 632     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 633
 634     formats = {'pdf': False, 'epub': False, 'mobi': False, 'odt': False, 'txt': False}
 635
 636     for book in collect_books(models.Book.tagged.with_all(shelf)):
 637         if book.pdf_file:
 638             formats['pdf'] = True
 639         if book.root_ancestor.epub_file:
 640             formats['epub'] = True
 641         if book.mobi_file:
 642             formats['mobi'] = True
 643         if book.txt_file:
 644             formats['txt'] = True
 645         for format in ('odt',):
 646             if book.has_media(format):
 647                 formats[format] = True
 648
 649     return HttpResponse(LazyEncoder().encode(formats))
 650
 651
 652 @login_required
 653 @require_POST
 654 @cache.never_cache
 655 def new_set(request):
 656     new_set_form = forms.NewSetForm(request.POST)
 657     if new_set_form.is_valid():
 658         new_set = new_set_form.save(request.user)
 659
 660         if request.is_ajax():
 661             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 662         else:
 663             return HttpResponseRedirect('/')
 664
 665     return HttpResponseRedirect('/')
 666
 667
 668 @login_required
 669 @require_POST
 670 @cache.never_cache
 671 def delete_shelf(request, slug):
 672     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 673     user_set.delete()
 674
 675     if request.is_ajax():
 676         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 677     else:
 678         return HttpResponseRedirect('/')
 679
 680
 681 # ==================
 682 # = Authentication =
 683 # ==================
 684 @require_POST
 685 @cache.never_cache
 686 def login(request):
 687     form = AuthenticationForm(data=request.POST, prefix='login')
 688     if form.is_valid():
 689         auth.login(request, form.get_user())
 690         response_data = {'success': True, 'errors': {}}
 691     else:
 692         response_data = {'success': False, 'errors': form.errors}
 693     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 694
 695
 696 @require_POST
 697 @cache.never_cache
 698 def register(request):
 699     registration_form = UserCreationForm(request.POST, prefix='registration')
 700     if registration_form.is_valid():
 701         user = registration_form.save()
 702         user = auth.authenticate(
 703             username=registration_form.cleaned_data['username'],
 704             password=registration_form.cleaned_data['password1']
 705         )
 706         auth.login(request, user)
 707         response_data = {'success': True, 'errors': {}}
 708     else:
 709         response_data = {'success': False, 'errors': registration_form.errors}
 710     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 711
 712
 713 @cache.never_cache
 714 def logout_then_redirect(request):
 715     auth.logout(request)
 716     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 717
 718
 719
 720 # =========
 721 # = Admin =
 722 # =========
 723 @login_required
 724 @staff_required
 725 def import_book(request):
 726     """docstring for import_book"""
 727     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 728     if book_import_form.is_valid():
 729         try:
 730             book_import_form.save()
 731         except:
 732             import sys
 733             import pprint
 734             import traceback
 735             info = sys.exc_info()
 736             exception = pprint.pformat(info[1])
 737             tb = '\n'.join(traceback.format_tb(info[2]))
 738             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 739         return HttpResponse(_("Book imported successfully"))
 740     else:
 741         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 742
 743
 744
 745 def clock(request):
 746     """ Provides server time for jquery.countdown,
 747     in a format suitable for Date.parse()
 748     """
 749     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))
 750
 751
 752 # info views for API
 753
 754 def book_info(request, id, lang='pl'):
 755     book = get_object_or_404(models.Book, id=id)
 756     # set language by hand
 757     translation.activate(lang)
 758     return render_to_response('catalogue/book_info.html', locals(),
 759         context_instance=RequestContext(request))
 760
 761
 762 def tag_info(request, id):
 763     tag = get_object_or_404(models.Tag, id=id)
 764     return HttpResponse(tag.description)
 765
 766
 767 def download_zip(request, format, slug):
 768     url = None
 769     if format in ('pdf', 'epub', 'mobi'):
 770         url = models.Book.zip_format(format)
 771     elif format == 'audiobook' and slug is not None:
 772         book = models.Book.objects.get(slug=slug)
 773         url = book.zip_audiobooks()
 774     else:
 775         raise Http404('No format specified for zip package')
 776     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))