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, AttachmentHttpResponse, async_build_pdf
  32 from catalogue.tasks import touch_tag
  33 from pdcounter import models as pdcounter_models
  34 from pdcounter import views as pdcounter_views
  35 from suggest.forms import PublishingSuggestForm
  36
  37 from os import path
  38
  39 staff_required = user_passes_test(lambda user: user.is_staff)
  40
  41
  42 class LazyEncoder(simplejson.JSONEncoder):
  43     def default(self, obj):
  44         if isinstance(obj, Promise):
  45             return force_unicode(obj)
  46         return obj
  47
  48 # shortcut for JSON reponses
  49 class JSONResponse(HttpResponse):
  50     def __init__(self, data={}, callback=None, **kwargs):
  51         # get rid of mimetype
  52         kwargs.pop('mimetype', None)
  53         data = simplejson.dumps(data)
  54         if callback:
  55             data = callback + "(" + data + ");"
  56         super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
  57
  58
  59 def catalogue(request):
  60     tags = models.Tag.objects.exclude(
  61         category__in=('set', 'book')).exclude(book_count=0)
  62     tags = list(tags)
  63     for tag in tags:
  64         tag.count = tag.book_count
  65     categories = split_tags(tags)
  66     fragment_tags = categories.get('theme', [])
  67
  68     form = forms.SearchForm()
  69     return render_to_response('catalogue/catalogue.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, theme_slug):
 207     kwargs = models.Book.split_urlid(book)
 208     if kwargs is None:
 209         raise Http404
 210     book = get_object_or_404(models.Book, **kwargs)
 211
 212     book_tag = book.book_tag()
 213     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 214     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 215
 216     form = forms.SearchForm()
 217     return render_to_response('catalogue/book_fragments.html', locals(),
 218         context_instance=RequestContext(request))
 219
 220
 221 def book_detail(request, book):
 222     kwargs = models.Book.split_urlid(book)
 223     if kwargs is None:
 224         raise Http404
 225     try:
 226         book = models.Book.objects.get(**kwargs)
 227     except models.Book.DoesNotExist:
 228         return pdcounter_views.book_stub_detail(request, kwargs['slug'])
 229
 230     book_tag = book.book_tag()
 231     tags = list(book.tags.filter(~Q(category='set')))
 232     categories = split_tags(tags)
 233     book_children = book.children.all().order_by('parent_number', 'sort_key')
 234
 235     _book = book
 236     parents = []
 237     while _book.parent:
 238         parents.append(_book.parent)
 239         _book = _book.parent
 240     parents = reversed(parents)
 241
 242     theme_counter = book.theme_counter
 243     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 244     for tag in book_themes:
 245         tag.count = theme_counter[tag.pk]
 246
 247     extra_info = book.get_extra_info_value()
 248     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 249
 250     projects = set()
 251     for m in book.media.filter(type='mp3'):
 252         # ogg files are always from the same project
 253         meta = m.get_extra_info_value()
 254         project = meta.get('project')
 255         if not project:
 256             # temporary fallback
 257             project = u'CzytamySłuchając'
 258
 259         projects.add((project, meta.get('funded_by', '')))
 260     projects = sorted(projects)
 261
 262     form = forms.SearchForm()
 263     custom_pdf_form = forms.CustomPDFForm()
 264     return render_to_response('catalogue/book_detail.html', locals(),
 265         context_instance=RequestContext(request))
 266
 267
 268 def book_text(request, book):
 269     kwargs = models.Book.split_fileid(book)
 270     if kwargs is None:
 271         raise Http404
 272     book = get_object_or_404(models.Book, **kwargs)
 273
 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 models.Book, Tag, models.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, book):
 508     if not request.user.is_authenticated():
 509         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 510
 511     kwargs = models.Book.split_urlid(book)
 512     if kwargs is None:
 513         raise Http404
 514     book = get_object_or_404(models.Book, **kwargs)
 515
 516     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 517     book_sets = book.tags.filter(category='set', user=request.user)
 518
 519     if request.method == 'POST':
 520         form = forms.ObjectSetsForm(book, request.user, request.POST)
 521         if form.is_valid():
 522             old_shelves = list(book.tags.filter(category='set'))
 523             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 524
 525             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 526                 touch_tag(shelf)
 527
 528             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 529                 touch_tag(shelf)
 530
 531             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 532             if request.is_ajax():
 533                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 534             else:
 535                 return HttpResponseRedirect('/')
 536     else:
 537         form = forms.ObjectSetsForm(book, request.user)
 538         new_set_form = forms.NewSetForm()
 539
 540     return render_to_response('catalogue/book_sets.html', locals(),
 541         context_instance=RequestContext(request))
 542
 543
 544 @login_required
 545 @require_POST
 546 @cache.never_cache
 547 def remove_from_shelf(request, shelf, book):
 548     kwargs = models.Book.split_urlid(book)
 549     if kwargs is None:
 550         raise Http404
 551     book = get_object_or_404(models.Book, **kwargs)
 552
 553     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 554
 555     if shelf in book.tags:
 556         models.Tag.objects.remove_tag(book, shelf)
 557         touch_tag(shelf)
 558
 559         return HttpResponse(_('Book was successfully removed from the shelf'))
 560     else:
 561         return HttpResponse(_('This book is not on the shelf'))
 562
 563
 564 def collect_books(books):
 565     """
 566     Returns all real books in collection.
 567     """
 568     result = []
 569     for book in books:
 570         if len(book.children.all()) == 0:
 571             result.append(book)
 572         else:
 573             result += collect_books(book.children.all())
 574     return result
 575
 576
 577 @cache.never_cache
 578 def download_shelf(request, slug):
 579     """"
 580     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 581     without loading the whole file into memory. A similar approach can
 582     be used for large dynamic PDF files.
 583     """
 584     from slughifi import slughifi
 585     import tempfile
 586     import zipfile
 587
 588     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 589
 590     formats = []
 591     form = forms.DownloadFormatsForm(request.GET)
 592     if form.is_valid():
 593         formats = form.cleaned_data['formats']
 594     if len(formats) == 0:
 595         formats = models.Book.ebook_formats
 596
 597     # Create a ZIP archive
 598     temp = tempfile.TemporaryFile()
 599     archive = zipfile.ZipFile(temp, 'w')
 600
 601     for book in collect_books(models.Book.tagged.with_all(shelf)):
 602         fileid = book.fileid()
 603         for ebook_format in models.Book.ebook_formats:
 604             if ebook_format in formats and book.has_media(ebook_format):
 605                 filename = book.get_media(ebook_format).path
 606                 archive.write(filename, str('%s.%s' % (fileid, ebook_format)))
 607     archive.close()
 608
 609     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 610     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 611     response['Content-Length'] = temp.tell()
 612
 613     temp.seek(0)
 614     response.write(temp.read())
 615     return response
 616
 617
 618 @cache.never_cache
 619 def shelf_book_formats(request, shelf):
 620     """"
 621     Returns a list of formats of books in shelf.
 622     """
 623     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 624
 625     formats = {}
 626     for ebook_format in models.Book.ebook_formats:
 627         formats[ebook_format] = False
 628
 629     for book in collect_books(models.Book.tagged.with_all(shelf)):
 630         for ebook_format in models.Book.ebook_formats:
 631             if book.has_media(ebook_format):
 632                 formats[ebook_format] = True
 633
 634     return HttpResponse(LazyEncoder().encode(formats))
 635
 636
 637 @login_required
 638 @require_POST
 639 @cache.never_cache
 640 def new_set(request):
 641     new_set_form = forms.NewSetForm(request.POST)
 642     if new_set_form.is_valid():
 643         new_set = new_set_form.save(request.user)
 644
 645         if request.is_ajax():
 646             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 647         else:
 648             return HttpResponseRedirect('/')
 649
 650     return HttpResponseRedirect('/')
 651
 652
 653 @login_required
 654 @require_POST
 655 @cache.never_cache
 656 def delete_shelf(request, slug):
 657     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 658     user_set.delete()
 659
 660     if request.is_ajax():
 661         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 662     else:
 663         return HttpResponseRedirect('/')
 664
 665
 666 # ==================
 667 # = Authentication =
 668 # ==================
 669 @require_POST
 670 @cache.never_cache
 671 def login(request):
 672     form = AuthenticationForm(data=request.POST, prefix='login')
 673     if form.is_valid():
 674         auth.login(request, form.get_user())
 675         response_data = {'success': True, 'errors': {}}
 676     else:
 677         response_data = {'success': False, 'errors': form.errors}
 678     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 679
 680
 681 @require_POST
 682 @cache.never_cache
 683 def register(request):
 684     registration_form = UserCreationForm(request.POST, prefix='registration')
 685     if registration_form.is_valid():
 686         user = registration_form.save()
 687         user = auth.authenticate(
 688             username=registration_form.cleaned_data['username'],
 689             password=registration_form.cleaned_data['password1']
 690         )
 691         auth.login(request, user)
 692         response_data = {'success': True, 'errors': {}}
 693     else:
 694         response_data = {'success': False, 'errors': registration_form.errors}
 695     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 696
 697
 698 @cache.never_cache
 699 def logout_then_redirect(request):
 700     auth.logout(request)
 701     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 702
 703
 704
 705 # =========
 706 # = Admin =
 707 # =========
 708 @login_required
 709 @staff_required
 710 def import_book(request):
 711     """docstring for import_book"""
 712     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 713     if book_import_form.is_valid():
 714         try:
 715             book_import_form.save()
 716         except:
 717             import sys
 718             import pprint
 719             import traceback
 720             info = sys.exc_info()
 721             exception = pprint.pformat(info[1])
 722             tb = '\n'.join(traceback.format_tb(info[2]))
 723             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 724         return HttpResponse(_("Book imported successfully"))
 725     else:
 726         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 727
 728
 729
 730 def clock(request):
 731     """ Provides server time for jquery.countdown,
 732     in a format suitable for Date.parse()
 733     """
 734     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))
 735
 736
 737 # info views for API
 738
 739 def book_info(request, id, lang='pl'):
 740     book = get_object_or_404(models.Book, id=id)
 741     # set language by hand
 742     translation.activate(lang)
 743     return render_to_response('catalogue/book_info.html', locals(),
 744         context_instance=RequestContext(request))
 745
 746
 747 def tag_info(request, id):
 748     tag = get_object_or_404(models.Tag, id=id)
 749     return HttpResponse(tag.description)
 750
 751
 752 def download_zip(request, format, book=None):
 753     kwargs = models.Book.split_fileid(book)
 754
 755     url = None
 756     if format in models.Book.ebook_formats:
 757         url = models.Book.zip_format(format)
 758     elif format == 'audiobook' and kwargs is not None:
 759         book = get_object_or_404(models.Book, **kwargs)
 760         url = book.zip_audiobooks()
 761     else:
 762         raise Http404('No format specified for zip package')
 763     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 764
 765
 766 def download_custom_pdf(request, book_fileid):
 767     kwargs = models.Book.split_fileid(book_fileid)
 768     if kwargs is None:
 769         raise Http404
 770     book = get_object_or_404(models.Book, **kwargs)
 771
 772     if request.method == 'GET':
 773         form = forms.CustomPDFForm(request.GET)
 774         if form.is_valid():
 775             cust = form.customizations
 776             pdf_file = models.get_customized_pdf_path(book, cust)
 777
 778             if not path.exists(pdf_file):
 779                 result = async_build_pdf.delay(book.id, cust, pdf_file)
 780                 result.wait()
 781             return AttachmentHttpResponse(file_name=("%s.pdf" % book_fileid), file_path=pdf_file, mimetype="application/pdf")
 782         else:
 783             raise Http404(_('Incorrect customization options for PDF'))
 784     else:
 785         raise Http404(_('Bad method'))