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 pdcounter import models as pdcounter_models
  33 from pdcounter import views as pdcounter_views
  34 from suggest.forms import PublishingSuggestForm
  35
  36 from os import path
  37
  38 staff_required = user_passes_test(lambda user: user.is_staff)
  39
  40
  41 class LazyEncoder(simplejson.JSONEncoder):
  42     def default(self, obj):
  43         if isinstance(obj, Promise):
  44             return force_unicode(obj)
  45         return obj
  46
  47 # shortcut for JSON reponses
  48 class JSONResponse(HttpResponse):
  49     def __init__(self, data={}, callback=None, **kwargs):
  50         # get rid of mimetype
  51         kwargs.pop('mimetype', None)
  52         data = simplejson.dumps(data)
  53         if callback:
  54             data = callback + "(" + data + ");"
  55         super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
  56
  57
  58 def main_page(request):
  59     if request.user.is_authenticated():
  60         shelves = models.Tag.objects.filter(category='set', user=request.user)
  61         new_set_form = forms.NewSetForm()
  62
  63     tags = models.Tag.objects.exclude(category__in=('set', 'book'))
  64     for tag in tags:
  65         tag.count = tag.get_count()
  66     categories = split_tags(tags)
  67     fragment_tags = categories.get('theme', [])
  68
  69     form = forms.SearchForm()
  70     return render_to_response('catalogue/main_page.html', locals(),
  71         context_instance=RequestContext(request))
  72
  73
  74 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  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 differentiate_tags(request, tags, ambiguous_slugs):
 100     beginning = '/'.join(tag.url_chunk for tag in tags)
 101     unparsed = '/'.join(ambiguous_slugs[1:])
 102     options = []
 103     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 104         options.append({
 105             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 106             'tags': [tag]
 107         })
 108     return render_to_response('catalogue/differentiate_tags.html',
 109                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 110                 context_instance=RequestContext(request))
 111
 112
 113 def tagged_object_list(request, tags=''):
 114     try:
 115         tags = models.Tag.get_tag_list(tags)
 116     except models.Tag.DoesNotExist:
 117         chunks = tags.split('/')
 118         if len(chunks) == 2 and chunks[0] == 'autor':
 119             return pdcounter_views.author_detail(request, chunks[1])
 120         else:
 121             raise Http404
 122     except models.Tag.MultipleObjectsReturned, e:
 123         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 124     except models.Tag.UrlDeprecationWarning, e:
 125         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 126
 127     try:
 128         if len(tags) > settings.MAX_TAG_LIST:
 129             raise Http404
 130     except AttributeError:
 131         pass
 132
 133     if len([tag for tag in tags if tag.category == 'book']):
 134         raise Http404
 135
 136     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 137     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 138     only_shelf = shelf_is_set and len(tags) == 1
 139     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 140
 141     objects = only_author = None
 142     categories = {}
 143
 144     if theme_is_set:
 145         shelf_tags = [tag for tag in tags if tag.category == 'set']
 146         fragment_tags = [tag for tag in tags if tag.category != 'set']
 147         fragments = models.Fragment.tagged.with_all(fragment_tags)
 148
 149         if shelf_tags:
 150             books = models.Book.tagged.with_all(shelf_tags).order_by()
 151             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 152             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 153
 154         # newtagging goes crazy if we just try:
 155         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 156         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 157         fragment_keys = [fragment.pk for fragment in fragments]
 158         if fragment_keys:
 159             related_tags = models.Fragment.tags.usage(counts=True,
 160                                 filters={'pk__in': fragment_keys},
 161                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 162             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 163             categories = split_tags(related_tags)
 164
 165             objects = fragments
 166     else:
 167         if shelf_is_set:
 168             objects = models.Book.tagged.with_all(tags)
 169         else:
 170             objects = models.Book.tagged_top_level(tags)
 171
 172         # get related tags from `tag_counter` and `theme_counter`
 173         related_counts = {}
 174         tags_pks = [tag.pk for tag in tags]
 175         for book in objects:
 176             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 177                 if tag_pk in tags_pks:
 178                     continue
 179                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 180         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 181         related_tags = [tag for tag in related_tags if tag not in tags]
 182         for tag in related_tags:
 183             tag.count = related_counts[tag.pk]
 184
 185         categories = split_tags(related_tags)
 186         del related_tags
 187
 188     if not objects:
 189         only_author = len(tags) == 1 and tags[0].category == 'author'
 190         objects = models.Book.objects.none()
 191
 192     return object_list(
 193         request,
 194         objects,
 195         template_name='catalogue/tagged_object_list.html',
 196         extra_context={
 197             'categories': categories,
 198             'only_shelf': only_shelf,
 199             'only_author': only_author,
 200             'only_my_shelf': only_my_shelf,
 201             'formats_form': forms.DownloadFormatsForm(),
 202             'tags': tags,
 203         }
 204     )
 205
 206
 207 def book_fragments(request, book_slug, theme_slug):
 208     book = get_object_or_404(models.Book, slug=book_slug)
 209     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 210     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 211     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 212
 213     form = forms.SearchForm()
 214     return render_to_response('catalogue/book_fragments.html', locals(),
 215         context_instance=RequestContext(request))
 216
 217
 218 def book_detail(request, slug):
 219     try:
 220         book = models.Book.objects.get(slug=slug)
 221     except models.Book.DoesNotExist:
 222         return pdcounter_views.book_stub_detail(request, slug)
 223
 224     book_tag = book.book_tag()
 225     tags = list(book.tags.filter(~Q(category='set')))
 226     categories = split_tags(tags)
 227     book_children = book.children.all().order_by('parent_number', 'sort_key')
 228
 229     _book = book
 230     parents = []
 231     while _book.parent:
 232         parents.append(_book.parent)
 233         _book = _book.parent
 234     parents = reversed(parents)
 235
 236     theme_counter = book.theme_counter
 237     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 238     for tag in book_themes:
 239         tag.count = theme_counter[tag.pk]
 240
 241     extra_info = book.get_extra_info_value()
 242     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 243
 244     projects = set()
 245     for m in book.media.filter(type='mp3'):
 246         # ogg files are always from the same project
 247         meta = m.get_extra_info_value()
 248         project = meta.get('project')
 249         if not project:
 250             # temporary fallback
 251             project = u'CzytamySłuchając'
 252
 253         projects.add((project, meta.get('funded_by', '')))
 254     projects = sorted(projects)
 255
 256     form = forms.SearchForm()
 257     custom_pdf_form = forms.CustomPDFForm()
 258     return render_to_response('catalogue/book_detail.html', locals(),
 259         context_instance=RequestContext(request))
 260
 261
 262 def book_text(request, slug):
 263     book = get_object_or_404(models.Book, slug=slug)
 264     if not book.has_html_file():
 265         raise Http404
 266     book_themes = {}
 267     for fragment in book.fragments.all():
 268         for theme in fragment.tags.filter(category='theme'):
 269             book_themes.setdefault(theme, []).append(fragment)
 270
 271     book_themes = book_themes.items()
 272     book_themes.sort(key=lambda s: s[0].sort_key)
 273     return render_to_response('catalogue/book_text.html', locals(),
 274         context_instance=RequestContext(request))
 275
 276
 277 # ==========
 278 # = Search =
 279 # ==========
 280
 281 def _no_diacritics_regexp(query):
 282     """ returns a regexp for searching for a query without diacritics
 283
 284     should be locale-aware """
 285     names = {
 286         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',
 287         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'
 288         }
 289     def repl(m):
 290         l = m.group()
 291         return u"(%s)" % '|'.join(names[l])
 292     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 293
 294 def unicode_re_escape(query):
 295     """ Unicode-friendly version of re.escape """
 296     return re.sub('(?u)(\W)', r'\\\1', query)
 297
 298 def _word_starts_with(name, prefix):
 299     """returns a Q object getting models having `name` contain a word
 300     starting with `prefix`
 301
 302     We define word characters as alphanumeric and underscore, like in JS.
 303
 304     Works for MySQL, PostgreSQL, Oracle.
 305     For SQLite, _sqlite* version is substituted for this.
 306     """
 307     kwargs = {}
 308
 309     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 310     # can't use [[:<:]] (word start),
 311     # but we want both `xy` and `(xy` to catch `(xyz)`
 312     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 313
 314     return Q(**kwargs)
 315
 316
 317 def _word_starts_with_regexp(prefix):
 318     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 319     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 320
 321
 322 def _sqlite_word_starts_with(name, prefix):
 323     """ version of _word_starts_with for SQLite
 324
 325     SQLite in Django uses Python re module
 326     """
 327     kwargs = {}
 328     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 329     return Q(**kwargs)
 330
 331
 332 if hasattr(settings, 'DATABASES'):
 333     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 334         _word_starts_with = _sqlite_word_starts_with
 335 elif settings.DATABASE_ENGINE == 'sqlite3':
 336     _word_starts_with = _sqlite_word_starts_with
 337
 338
 339 class App():
 340     def __init__(self, name, view):
 341         self.name = name
 342         self._view = view
 343         self.lower = name.lower()
 344         self.category = 'application'
 345     def view(self):
 346         return reverse(*self._view)
 347
 348 _apps = (
 349     App(u'Leśmianator', (u'lesmianator', )),
 350     )
 351
 352
 353 def _tags_starting_with(prefix, user=None):
 354     prefix = prefix.lower()
 355     # PD counter
 356     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 357     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 358
 359     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 360     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 361     if user and user.is_authenticated():
 362         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 363     else:
 364         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 365
 366     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 367     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 368
 369
 370 def _get_result_link(match, tag_list):
 371     if isinstance(match, models.Tag):
 372         return reverse('catalogue.views.tagged_object_list',
 373             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 374         )
 375     elif isinstance(match, App):
 376         return match.view()
 377     else:
 378         return match.get_absolute_url()
 379
 380
 381 def _get_result_type(match):
 382     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 383         type = 'book'
 384     else:
 385         type = match.category
 386     return type
 387
 388
 389 def books_starting_with(prefix):
 390     prefix = prefix.lower()
 391     return models.Book.objects.filter(_word_starts_with('title', prefix))
 392
 393
 394 def find_best_matches(query, user=None):
 395     """ Finds a Book, Tag, BookStub or Author best matching a query.
 396
 397     Returns a with:
 398       - zero elements when nothing is found,
 399       - one element when a best result is found,
 400       - more then one element on multiple exact matches
 401
 402     Raises a ValueError on too short a query.
 403     """
 404
 405     query = query.lower()
 406     if len(query) < 2:
 407         raise ValueError("query must have at least two characters")
 408
 409     result = tuple(_tags_starting_with(query, user))
 410     # remove pdcounter stuff
 411     book_titles = set(match.pretty_title().lower() for match in result
 412                       if isinstance(match, models.Book))
 413     authors = set(match.name.lower() for match in result
 414                   if isinstance(match, models.Tag) and match.category=='author')
 415     result = tuple(res for res in result if not (
 416                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 417                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 418              ))
 419
 420     exact_matches = tuple(res for res in result if res.name.lower() == query)
 421     if exact_matches:
 422         return exact_matches
 423     else:
 424         return tuple(result)[:1]
 425
 426
 427 def search(request):
 428     tags = request.GET.get('tags', '')
 429     prefix = request.GET.get('q', '')
 430
 431     try:
 432         tag_list = models.Tag.get_tag_list(tags)
 433     except:
 434         tag_list = []
 435
 436     try:
 437         result = find_best_matches(prefix, request.user)
 438     except ValueError:
 439         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 440             context_instance=RequestContext(request))
 441
 442     if len(result) == 1:
 443         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 444     elif len(result) > 1:
 445         return render_to_response('catalogue/search_multiple_hits.html',
 446             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 447             context_instance=RequestContext(request))
 448     else:
 449         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 450         return render_to_response('catalogue/search_no_hits.html',
 451             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 452             context_instance=RequestContext(request))
 453
 454
 455 def tags_starting_with(request):
 456     prefix = request.GET.get('q', '')
 457     # Prefix must have at least 2 characters
 458     if len(prefix) < 2:
 459         return HttpResponse('')
 460     tags_list = []
 461     result = ""
 462     for tag in _tags_starting_with(prefix, request.user):
 463         if not tag.name in tags_list:
 464             result += "\n" + tag.name
 465             tags_list.append(tag.name)
 466     return HttpResponse(result)
 467
 468 def json_tags_starting_with(request, callback=None):
 469     # Callback for JSONP
 470     prefix = request.GET.get('q', '')
 471     callback = request.GET.get('callback', '')
 472     # Prefix must have at least 2 characters
 473     if len(prefix) < 2:
 474         return HttpResponse('')
 475     tags_list = []
 476     for tag in _tags_starting_with(prefix, request.user):
 477         if not tag.name in tags_list:
 478             tags_list.append(tag.name)
 479     if request.GET.get('mozhint', ''):
 480         result = [prefix, tags_list]
 481     else:
 482         result = {"matches": tags_list}
 483     return JSONResponse(result, callback)
 484
 485 # ====================
 486 # = Shelf management =
 487 # ====================
 488 @login_required
 489 @cache.never_cache
 490 def user_shelves(request):
 491     shelves = models.Tag.objects.filter(category='set', user=request.user)
 492     new_set_form = forms.NewSetForm()
 493     return render_to_response('catalogue/user_shelves.html', locals(),
 494             context_instance=RequestContext(request))
 495
 496 @cache.never_cache
 497 def book_sets(request, slug):
 498     if not request.user.is_authenticated():
 499         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 500
 501     book = get_object_or_404(models.Book, slug=slug)
 502     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 503     book_sets = book.tags.filter(category='set', user=request.user)
 504
 505     if request.method == 'POST':
 506         form = forms.ObjectSetsForm(book, request.user, request.POST)
 507         if form.is_valid():
 508             old_shelves = list(book.tags.filter(category='set'))
 509             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 510
 511             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 512                 shelf.book_count = None
 513                 shelf.save()
 514
 515             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 516                 shelf.book_count = None
 517                 shelf.save()
 518
 519             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 520             if request.is_ajax():
 521                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 522             else:
 523                 return HttpResponseRedirect('/')
 524     else:
 525         form = forms.ObjectSetsForm(book, request.user)
 526         new_set_form = forms.NewSetForm()
 527
 528     return render_to_response('catalogue/book_sets.html', locals(),
 529         context_instance=RequestContext(request))
 530
 531
 532 @login_required
 533 @require_POST
 534 @cache.never_cache
 535 def remove_from_shelf(request, shelf, book):
 536     book = get_object_or_404(models.Book, slug=book)
 537     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 538
 539     if shelf in book.tags:
 540         models.Tag.objects.remove_tag(book, shelf)
 541
 542         shelf.book_count = None
 543         shelf.save()
 544
 545         return HttpResponse(_('Book was successfully removed from the shelf'))
 546     else:
 547         return HttpResponse(_('This book is not on the shelf'))
 548
 549
 550 def collect_books(books):
 551     """
 552     Returns all real books in collection.
 553     """
 554     result = []
 555     for book in books:
 556         if len(book.children.all()) == 0:
 557             result.append(book)
 558         else:
 559             result += collect_books(book.children.all())
 560     return result
 561
 562
 563 @cache.never_cache
 564 def download_shelf(request, slug):
 565     """"
 566     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 567     without loading the whole file into memory. A similar approach can
 568     be used for large dynamic PDF files.
 569     """
 570     from slughifi import slughifi
 571     import tempfile
 572     import zipfile
 573
 574     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 575
 576     formats = []
 577     form = forms.DownloadFormatsForm(request.GET)
 578     if form.is_valid():
 579         formats = form.cleaned_data['formats']
 580     if len(formats) == 0:
 581         formats = ['pdf', 'epub', 'mobi', 'odt', 'txt']
 582
 583     # Create a ZIP archive
 584     temp = tempfile.TemporaryFile()
 585     archive = zipfile.ZipFile(temp, 'w')
 586
 587     already = set()
 588     for book in collect_books(models.Book.tagged.with_all(shelf)):
 589         if 'pdf' in formats and book.pdf_file:
 590             filename = book.pdf_file.path
 591             archive.write(filename, str('%s.pdf' % book.slug))
 592         if 'mobi' in formats and book.mobi_file:
 593             filename = book.mobi_file.path
 594             archive.write(filename, str('%s.mobi' % book.slug))
 595         if book.root_ancestor not in already and 'epub' in formats and book.root_ancestor.epub_file:
 596             filename = book.root_ancestor.epub_file.path
 597             archive.write(filename, str('%s.epub' % book.root_ancestor.slug))
 598             already.add(book.root_ancestor)
 599         if 'odt' in formats and book.has_media("odt"):
 600             for file in book.get_media("odt"):
 601                 filename = file.file.path
 602                 archive.write(filename, str('%s.odt' % slughifi(file.name)))
 603         if 'txt' in formats and book.txt_file:
 604             filename = book.txt_file.path
 605             archive.write(filename, str('%s.txt' % book.slug))
 606     archive.close()
 607
 608     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 609     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 610     response['Content-Length'] = temp.tell()
 611
 612     temp.seek(0)
 613     response.write(temp.read())
 614     return response
 615
 616
 617 @cache.never_cache
 618 def shelf_book_formats(request, shelf):
 619     """"
 620     Returns a list of formats of books in shelf.
 621     """
 622     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 623
 624     formats = {'pdf': False, 'epub': False, 'mobi': False, 'odt': False, 'txt': False}
 625
 626     for book in collect_books(models.Book.tagged.with_all(shelf)):
 627         if book.pdf_file:
 628             formats['pdf'] = True
 629         if book.root_ancestor.epub_file:
 630             formats['epub'] = True
 631         if book.mobi_file:
 632             formats['mobi'] = True
 633         if book.txt_file:
 634             formats['txt'] = True
 635         for format in ('odt',):
 636             if book.has_media(format):
 637                 formats[format] = True
 638
 639     return HttpResponse(LazyEncoder().encode(formats))
 640
 641
 642 @login_required
 643 @require_POST
 644 @cache.never_cache
 645 def new_set(request):
 646     new_set_form = forms.NewSetForm(request.POST)
 647     if new_set_form.is_valid():
 648         new_set = new_set_form.save(request.user)
 649
 650         if request.is_ajax():
 651             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 652         else:
 653             return HttpResponseRedirect('/')
 654
 655     return HttpResponseRedirect('/')
 656
 657
 658 @login_required
 659 @require_POST
 660 @cache.never_cache
 661 def delete_shelf(request, slug):
 662     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 663     user_set.delete()
 664
 665     if request.is_ajax():
 666         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 667     else:
 668         return HttpResponseRedirect('/')
 669
 670
 671 # ==================
 672 # = Authentication =
 673 # ==================
 674 @require_POST
 675 @cache.never_cache
 676 def login(request):
 677     form = AuthenticationForm(data=request.POST, prefix='login')
 678     if form.is_valid():
 679         auth.login(request, form.get_user())
 680         response_data = {'success': True, 'errors': {}}
 681     else:
 682         response_data = {'success': False, 'errors': form.errors}
 683     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 684
 685
 686 @require_POST
 687 @cache.never_cache
 688 def register(request):
 689     registration_form = UserCreationForm(request.POST, prefix='registration')
 690     if registration_form.is_valid():
 691         user = registration_form.save()
 692         user = auth.authenticate(
 693             username=registration_form.cleaned_data['username'],
 694             password=registration_form.cleaned_data['password1']
 695         )
 696         auth.login(request, user)
 697         response_data = {'success': True, 'errors': {}}
 698     else:
 699         response_data = {'success': False, 'errors': registration_form.errors}
 700     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 701
 702
 703 @cache.never_cache
 704 def logout_then_redirect(request):
 705     auth.logout(request)
 706     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 707
 708
 709
 710 # =========
 711 # = Admin =
 712 # =========
 713 @login_required
 714 @staff_required
 715 def import_book(request):
 716     """docstring for import_book"""
 717     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 718     if book_import_form.is_valid():
 719         try:
 720             book_import_form.save()
 721         except:
 722             import sys
 723             import pprint
 724             import traceback
 725             info = sys.exc_info()
 726             exception = pprint.pformat(info[1])
 727             tb = '\n'.join(traceback.format_tb(info[2]))
 728             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 729         return HttpResponse(_("Book imported successfully"))
 730     else:
 731         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 732
 733
 734
 735 def clock(request):
 736     """ Provides server time for jquery.countdown,
 737     in a format suitable for Date.parse()
 738     """
 739     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))
 740
 741
 742 # info views for API
 743
 744 def book_info(request, id, lang='pl'):
 745     book = get_object_or_404(models.Book, id=id)
 746     # set language by hand
 747     translation.activate(lang)
 748     return render_to_response('catalogue/book_info.html', locals(),
 749         context_instance=RequestContext(request))
 750
 751
 752 def tag_info(request, id):
 753     tag = get_object_or_404(models.Tag, id=id)
 754     return HttpResponse(tag.description)
 755
 756
 757 def download_zip(request, format, slug):
 758     url = None
 759     if format in ('pdf', 'epub', 'mobi'):
 760         url = models.Book.zip_format(format)
 761     elif format == 'audiobook' and slug is not None:
 762         book = models.Book.objects.get(slug=slug)
 763         url = book.zip_audiobooks()
 764     else:
 765         raise Http404('No format specified for zip package')
 766     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 767
 768
 769 def download_custom_pdf(request, slug):
 770     book = models.Book.objects.get(slug=slug)
 771     if request.method == 'GET':
 772         form = forms.CustomPDFForm(request.GET)
 773         if form.is_valid():
 774             cust = form.customizations
 775             pdf_file = models.get_customized_pdf_path(book, cust)
 776
 777             if not path.exists(pdf_file):
 778                 result = async_build_pdf.delay(book.id, cust, pdf_file)
 779                 result.wait()
 780             return AttachmentHttpResponse(file_name=("%s.pdf" % book.slug), file_path=pdf_file, mimetype="application/pdf")
 781         else:
 782             raise Http404(_('Incorrect customization options for PDF'))
 783     else:
 784         raise Http404(_('Bad method'))