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 catalogue(request):
  59     tags = models.Tag.objects.exclude(category__in=('set', 'book'))
  60     for tag in tags:
  61         tag.count = tag.get_count()
  62     categories = split_tags(tags)
  63     fragment_tags = categories.get('theme', [])
  64
  65     form = forms.SearchForm()
  66     return render_to_response('catalogue/catalogue.html', locals(),
  67         context_instance=RequestContext(request))
  68
  69
  70 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  71     """ generates a listing of all books, optionally filtered with a test function """
  72
  73     form = forms.SearchForm()
  74
  75     books_by_author, orphans, books_by_parent = models.Book.book_list(filter)
  76     books_nav = SortedDict()
  77     for tag in books_by_author:
  78         if books_by_author[tag]:
  79             books_nav.setdefault(tag.sort_key[0], []).append(tag)
  80
  81     return render_to_response(template_name, locals(),
  82         context_instance=RequestContext(request))
  83
  84
  85 def audiobook_list(request):
  86     return book_list(request, Q(media__type='mp3') | Q(media__type='ogg'),
  87                      template_name='catalogue/audiobook_list.html')
  88
  89
  90 def daisy_list(request):
  91     return book_list(request, Q(media__type='daisy'),
  92                      template_name='catalogue/daisy_list.html')
  93
  94
  95 def differentiate_tags(request, tags, ambiguous_slugs):
  96     beginning = '/'.join(tag.url_chunk for tag in tags)
  97     unparsed = '/'.join(ambiguous_slugs[1:])
  98     options = []
  99     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 100         options.append({
 101             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 102             'tags': [tag]
 103         })
 104     return render_to_response('catalogue/differentiate_tags.html',
 105                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 106                 context_instance=RequestContext(request))
 107
 108
 109 def tagged_object_list(request, tags=''):
 110     try:
 111         tags = models.Tag.get_tag_list(tags)
 112     except models.Tag.DoesNotExist:
 113         chunks = tags.split('/')
 114         if len(chunks) == 2 and chunks[0] == 'autor':
 115             return pdcounter_views.author_detail(request, chunks[1])
 116         else:
 117             raise Http404
 118     except models.Tag.MultipleObjectsReturned, e:
 119         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 120     except models.Tag.UrlDeprecationWarning, e:
 121         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 122
 123     try:
 124         if len(tags) > settings.MAX_TAG_LIST:
 125             raise Http404
 126     except AttributeError:
 127         pass
 128
 129     if len([tag for tag in tags if tag.category == 'book']):
 130         raise Http404
 131
 132     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 133     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 134     only_shelf = shelf_is_set and len(tags) == 1
 135     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 136
 137     objects = only_author = None
 138     categories = {}
 139
 140     if theme_is_set:
 141         shelf_tags = [tag for tag in tags if tag.category == 'set']
 142         fragment_tags = [tag for tag in tags if tag.category != 'set']
 143         fragments = models.Fragment.tagged.with_all(fragment_tags)
 144
 145         if shelf_tags:
 146             books = models.Book.tagged.with_all(shelf_tags).order_by()
 147             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 148             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 149
 150         # newtagging goes crazy if we just try:
 151         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 152         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 153         fragment_keys = [fragment.pk for fragment in fragments]
 154         if fragment_keys:
 155             related_tags = models.Fragment.tags.usage(counts=True,
 156                                 filters={'pk__in': fragment_keys},
 157                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 158             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 159             categories = split_tags(related_tags)
 160
 161             objects = fragments
 162     else:
 163         if shelf_is_set:
 164             objects = models.Book.tagged.with_all(tags)
 165         else:
 166             objects = models.Book.tagged_top_level(tags)
 167
 168         # get related tags from `tag_counter` and `theme_counter`
 169         related_counts = {}
 170         tags_pks = [tag.pk for tag in tags]
 171         for book in objects:
 172             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 173                 if tag_pk in tags_pks:
 174                     continue
 175                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 176         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 177         related_tags = [tag for tag in related_tags if tag not in tags]
 178         for tag in related_tags:
 179             tag.count = related_counts[tag.pk]
 180
 181         categories = split_tags(related_tags)
 182         del related_tags
 183
 184     if not objects:
 185         only_author = len(tags) == 1 and tags[0].category == 'author'
 186         objects = models.Book.objects.none()
 187
 188     return object_list(
 189         request,
 190         objects,
 191         template_name='catalogue/tagged_object_list.html',
 192         extra_context={
 193             'categories': categories,
 194             'only_shelf': only_shelf,
 195             'only_author': only_author,
 196             'only_my_shelf': only_my_shelf,
 197             'formats_form': forms.DownloadFormatsForm(),
 198             'tags': tags,
 199         }
 200     )
 201
 202
 203 def book_fragments(request, book, theme_slug):
 204     kwargs = models.Book.split_urlid(book)
 205     if kwargs is None:
 206         raise Http404
 207     book = get_object_or_404(models.Book, **kwargs)
 208
 209     book_tag = book.book_tag()
 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, book):
 219     kwargs = models.Book.split_urlid(book)
 220     if kwargs is None:
 221         raise Http404
 222     try:
 223         book = models.Book.objects.get(**kwargs)
 224     except models.Book.DoesNotExist:
 225         return pdcounter_views.book_stub_detail(request, kwargs['slug'])
 226
 227     book_tag = book.book_tag()
 228     tags = list(book.tags.filter(~Q(category='set')))
 229     categories = split_tags(tags)
 230     book_children = book.children.all().order_by('parent_number', 'sort_key')
 231
 232     _book = book
 233     parents = []
 234     while _book.parent:
 235         parents.append(_book.parent)
 236         _book = _book.parent
 237     parents = reversed(parents)
 238
 239     theme_counter = book.theme_counter
 240     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 241     for tag in book_themes:
 242         tag.count = theme_counter[tag.pk]
 243
 244     extra_info = book.get_extra_info_value()
 245     hide_about = extra_info.get('about', '').startswith('http://wiki.wolnepodreczniki.pl')
 246
 247     projects = set()
 248     for m in book.media.filter(type='mp3'):
 249         # ogg files are always from the same project
 250         meta = m.get_extra_info_value()
 251         project = meta.get('project')
 252         if not project:
 253             # temporary fallback
 254             project = u'CzytamySłuchając'
 255
 256         projects.add((project, meta.get('funded_by', '')))
 257     projects = sorted(projects)
 258
 259     form = forms.SearchForm()
 260     custom_pdf_form = forms.CustomPDFForm()
 261     return render_to_response('catalogue/book_detail.html', locals(),
 262         context_instance=RequestContext(request))
 263
 264
 265 def book_text(request, book):
 266     kwargs = models.Book.split_fileid(book)
 267     if kwargs is None:
 268         raise Http404
 269     book = get_object_or_404(models.Book, **kwargs)
 270
 271     if not book.has_html_file():
 272         raise Http404
 273     book_themes = {}
 274     for fragment in book.fragments.all():
 275         for theme in fragment.tags.filter(category='theme'):
 276             book_themes.setdefault(theme, []).append(fragment)
 277
 278     book_themes = book_themes.items()
 279     book_themes.sort(key=lambda s: s[0].sort_key)
 280     return render_to_response('catalogue/book_text.html', locals(),
 281         context_instance=RequestContext(request))
 282
 283
 284 # ==========
 285 # = Search =
 286 # ==========
 287
 288 def _no_diacritics_regexp(query):
 289     """ returns a regexp for searching for a query without diacritics
 290
 291     should be locale-aware """
 292     names = {
 293         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',
 294         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'
 295         }
 296     def repl(m):
 297         l = m.group()
 298         return u"(%s)" % '|'.join(names[l])
 299     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 300
 301 def unicode_re_escape(query):
 302     """ Unicode-friendly version of re.escape """
 303     return re.sub('(?u)(\W)', r'\\\1', query)
 304
 305 def _word_starts_with(name, prefix):
 306     """returns a Q object getting models having `name` contain a word
 307     starting with `prefix`
 308
 309     We define word characters as alphanumeric and underscore, like in JS.
 310
 311     Works for MySQL, PostgreSQL, Oracle.
 312     For SQLite, _sqlite* version is substituted for this.
 313     """
 314     kwargs = {}
 315
 316     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 317     # can't use [[:<:]] (word start),
 318     # but we want both `xy` and `(xy` to catch `(xyz)`
 319     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 320
 321     return Q(**kwargs)
 322
 323
 324 def _word_starts_with_regexp(prefix):
 325     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 326     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 327
 328
 329 def _sqlite_word_starts_with(name, prefix):
 330     """ version of _word_starts_with for SQLite
 331
 332     SQLite in Django uses Python re module
 333     """
 334     kwargs = {}
 335     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 336     return Q(**kwargs)
 337
 338
 339 if hasattr(settings, 'DATABASES'):
 340     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 341         _word_starts_with = _sqlite_word_starts_with
 342 elif settings.DATABASE_ENGINE == 'sqlite3':
 343     _word_starts_with = _sqlite_word_starts_with
 344
 345
 346 class App():
 347     def __init__(self, name, view):
 348         self.name = name
 349         self._view = view
 350         self.lower = name.lower()
 351         self.category = 'application'
 352     def view(self):
 353         return reverse(*self._view)
 354
 355 _apps = (
 356     App(u'Leśmianator', (u'lesmianator', )),
 357     )
 358
 359
 360 def _tags_starting_with(prefix, user=None):
 361     prefix = prefix.lower()
 362     # PD counter
 363     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 364     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 365
 366     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 367     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 368     if user and user.is_authenticated():
 369         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 370     else:
 371         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 372
 373     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 374     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 375
 376
 377 def _get_result_link(match, tag_list):
 378     if isinstance(match, models.Tag):
 379         return reverse('catalogue.views.tagged_object_list',
 380             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 381         )
 382     elif isinstance(match, App):
 383         return match.view()
 384     else:
 385         return match.get_absolute_url()
 386
 387
 388 def _get_result_type(match):
 389     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 390         type = 'book'
 391     else:
 392         type = match.category
 393     return type
 394
 395
 396 def books_starting_with(prefix):
 397     prefix = prefix.lower()
 398     return models.Book.objects.filter(_word_starts_with('title', prefix))
 399
 400
 401 def find_best_matches(query, user=None):
 402     """ Finds a models.Book, Tag, models.BookStub or Author best matching a query.
 403
 404     Returns a with:
 405       - zero elements when nothing is found,
 406       - one element when a best result is found,
 407       - more then one element on multiple exact matches
 408
 409     Raises a ValueError on too short a query.
 410     """
 411
 412     query = query.lower()
 413     if len(query) < 2:
 414         raise ValueError("query must have at least two characters")
 415
 416     result = tuple(_tags_starting_with(query, user))
 417     # remove pdcounter stuff
 418     book_titles = set(match.pretty_title().lower() for match in result
 419                       if isinstance(match, models.Book))
 420     authors = set(match.name.lower() for match in result
 421                   if isinstance(match, models.Tag) and match.category=='author')
 422     result = tuple(res for res in result if not (
 423                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 424                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 425              ))
 426
 427     exact_matches = tuple(res for res in result if res.name.lower() == query)
 428     if exact_matches:
 429         return exact_matches
 430     else:
 431         return tuple(result)[:1]
 432
 433
 434 def search(request):
 435     tags = request.GET.get('tags', '')
 436     prefix = request.GET.get('q', '')
 437
 438     try:
 439         tag_list = models.Tag.get_tag_list(tags)
 440     except:
 441         tag_list = []
 442
 443     try:
 444         result = find_best_matches(prefix, request.user)
 445     except ValueError:
 446         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 447             context_instance=RequestContext(request))
 448
 449     if len(result) == 1:
 450         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 451     elif len(result) > 1:
 452         return render_to_response('catalogue/search_multiple_hits.html',
 453             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 454             context_instance=RequestContext(request))
 455     else:
 456         form = PublishingSuggestForm(initial={"books": prefix + ", "})
 457         return render_to_response('catalogue/search_no_hits.html',
 458             {'tags':tag_list, 'prefix':prefix, "pubsuggest_form": form},
 459             context_instance=RequestContext(request))
 460
 461
 462 def tags_starting_with(request):
 463     prefix = request.GET.get('q', '')
 464     # Prefix must have at least 2 characters
 465     if len(prefix) < 2:
 466         return HttpResponse('')
 467     tags_list = []
 468     result = ""
 469     for tag in _tags_starting_with(prefix, request.user):
 470         if not tag.name in tags_list:
 471             result += "\n" + tag.name
 472             tags_list.append(tag.name)
 473     return HttpResponse(result)
 474
 475 def json_tags_starting_with(request, callback=None):
 476     # Callback for JSONP
 477     prefix = request.GET.get('q', '')
 478     callback = request.GET.get('callback', '')
 479     # Prefix must have at least 2 characters
 480     if len(prefix) < 2:
 481         return HttpResponse('')
 482     tags_list = []
 483     for tag in _tags_starting_with(prefix, request.user):
 484         if not tag.name in tags_list:
 485             tags_list.append(tag.name)
 486     if request.GET.get('mozhint', ''):
 487         result = [prefix, tags_list]
 488     else:
 489         result = {"matches": tags_list}
 490     return JSONResponse(result, callback)
 491
 492 # ====================
 493 # = Shelf management =
 494 # ====================
 495 @login_required
 496 @cache.never_cache
 497 def user_shelves(request):
 498     shelves = models.Tag.objects.filter(category='set', user=request.user)
 499     new_set_form = forms.NewSetForm()
 500     return render_to_response('catalogue/user_shelves.html', locals(),
 501             context_instance=RequestContext(request))
 502
 503 @cache.never_cache
 504 def book_sets(request, book):
 505     if not request.user.is_authenticated():
 506         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 507
 508     kwargs = models.Book.split_urlid(book)
 509     if kwargs is None:
 510         raise Http404
 511     book = get_object_or_404(models.Book, **kwargs)
 512
 513     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 514     book_sets = book.tags.filter(category='set', user=request.user)
 515
 516     if request.method == 'POST':
 517         form = forms.ObjectSetsForm(book, request.user, request.POST)
 518         if form.is_valid():
 519             old_shelves = list(book.tags.filter(category='set'))
 520             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 521
 522             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 523                 shelf.book_count = None
 524                 shelf.save()
 525
 526             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 527                 shelf.book_count = None
 528                 shelf.save()
 529
 530             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 531             if request.is_ajax():
 532                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 533             else:
 534                 return HttpResponseRedirect('/')
 535     else:
 536         form = forms.ObjectSetsForm(book, request.user)
 537         new_set_form = forms.NewSetForm()
 538
 539     return render_to_response('catalogue/book_sets.html', locals(),
 540         context_instance=RequestContext(request))
 541
 542
 543 @login_required
 544 @require_POST
 545 @cache.never_cache
 546 def remove_from_shelf(request, shelf, book):
 547     kwargs = models.Book.split_urlid(book)
 548     if kwargs is None:
 549         raise Http404
 550     book = get_object_or_404(models.Book, **kwargs)
 551
 552     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 553
 554     if shelf in book.tags:
 555         models.Tag.objects.remove_tag(book, shelf)
 556
 557         shelf.book_count = None
 558         shelf.save()
 559
 560         return HttpResponse(_('Book was successfully removed from the shelf'))
 561     else:
 562         return HttpResponse(_('This book is not on the shelf'))
 563
 564
 565 def collect_books(books):
 566     """
 567     Returns all real books in collection.
 568     """
 569     result = []
 570     for book in books:
 571         if len(book.children.all()) == 0:
 572             result.append(book)
 573         else:
 574             result += collect_books(book.children.all())
 575     return result
 576
 577
 578 @cache.never_cache
 579 def download_shelf(request, slug):
 580     """"
 581     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 582     without loading the whole file into memory. A similar approach can
 583     be used for large dynamic PDF files.
 584     """
 585     from slughifi import slughifi
 586     import tempfile
 587     import zipfile
 588
 589     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 590
 591     formats = []
 592     form = forms.DownloadFormatsForm(request.GET)
 593     if form.is_valid():
 594         formats = form.cleaned_data['formats']
 595     if len(formats) == 0:
 596         formats = models.Book.ebook_formats
 597
 598     # Create a ZIP archive
 599     temp = tempfile.TemporaryFile()
 600     archive = zipfile.ZipFile(temp, 'w')
 601
 602     for book in collect_books(models.Book.tagged.with_all(shelf)):
 603         fileid = book.fileid()
 604         for ebook_format in models.Book.ebook_formats:
 605             if ebook_format in formats and book.has_media(ebook_format):
 606                 filename = book.get_media(ebook_format).path
 607                 archive.write(filename, str('%s.%s' % (fileid, ebook_format)))
 608     archive.close()
 609
 610     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 611     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 612     response['Content-Length'] = temp.tell()
 613
 614     temp.seek(0)
 615     response.write(temp.read())
 616     return response
 617
 618
 619 @cache.never_cache
 620 def shelf_book_formats(request, shelf):
 621     """"
 622     Returns a list of formats of books in shelf.
 623     """
 624     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 625
 626     formats = {}
 627     for ebook_format in models.Book.ebook_formats:
 628         formats[ebook_format] = False
 629
 630     for book in collect_books(models.Book.tagged.with_all(shelf)):
 631         for ebook_format in models.Book.ebook_formats:
 632             if book.has_media(ebook_format):
 633                 formats[ebook_format] = True
 634
 635     return HttpResponse(LazyEncoder().encode(formats))
 636
 637
 638 @login_required
 639 @require_POST
 640 @cache.never_cache
 641 def new_set(request):
 642     new_set_form = forms.NewSetForm(request.POST)
 643     if new_set_form.is_valid():
 644         new_set = new_set_form.save(request.user)
 645
 646         if request.is_ajax():
 647             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 648         else:
 649             return HttpResponseRedirect('/')
 650
 651     return HttpResponseRedirect('/')
 652
 653
 654 @login_required
 655 @require_POST
 656 @cache.never_cache
 657 def delete_shelf(request, slug):
 658     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 659     user_set.delete()
 660
 661     if request.is_ajax():
 662         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 663     else:
 664         return HttpResponseRedirect('/')
 665
 666
 667 # ==================
 668 # = Authentication =
 669 # ==================
 670 @require_POST
 671 @cache.never_cache
 672 def login(request):
 673     form = AuthenticationForm(data=request.POST, prefix='login')
 674     if form.is_valid():
 675         auth.login(request, form.get_user())
 676         response_data = {'success': True, 'errors': {}}
 677     else:
 678         response_data = {'success': False, 'errors': form.errors}
 679     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 680
 681
 682 @require_POST
 683 @cache.never_cache
 684 def register(request):
 685     registration_form = UserCreationForm(request.POST, prefix='registration')
 686     if registration_form.is_valid():
 687         user = registration_form.save()
 688         user = auth.authenticate(
 689             username=registration_form.cleaned_data['username'],
 690             password=registration_form.cleaned_data['password1']
 691         )
 692         auth.login(request, user)
 693         response_data = {'success': True, 'errors': {}}
 694     else:
 695         response_data = {'success': False, 'errors': registration_form.errors}
 696     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 697
 698
 699 @cache.never_cache
 700 def logout_then_redirect(request):
 701     auth.logout(request)
 702     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 703
 704
 705
 706 # =========
 707 # = Admin =
 708 # =========
 709 @login_required
 710 @staff_required
 711 def import_book(request):
 712     """docstring for import_book"""
 713     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 714     if book_import_form.is_valid():
 715         try:
 716             book_import_form.save()
 717         except:
 718             import sys
 719             import pprint
 720             import traceback
 721             info = sys.exc_info()
 722             exception = pprint.pformat(info[1])
 723             tb = '\n'.join(traceback.format_tb(info[2]))
 724             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 725         return HttpResponse(_("Book imported successfully"))
 726     else:
 727         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 728
 729
 730
 731 def clock(request):
 732     """ Provides server time for jquery.countdown,
 733     in a format suitable for Date.parse()
 734     """
 735     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))
 736
 737
 738 # info views for API
 739
 740 def book_info(request, id, lang='pl'):
 741     book = get_object_or_404(models.Book, id=id)
 742     # set language by hand
 743     translation.activate(lang)
 744     return render_to_response('catalogue/book_info.html', locals(),
 745         context_instance=RequestContext(request))
 746
 747
 748 def tag_info(request, id):
 749     tag = get_object_or_404(models.Tag, id=id)
 750     return HttpResponse(tag.description)
 751
 752
 753 def download_zip(request, format, book=None):
 754     kwargs = models.Book.split_fileid(book)
 755
 756     url = None
 757     if format in models.Book.ebook_formats:
 758         url = models.Book.zip_format(format)
 759     elif format == 'audiobook' and kwargs is not None:
 760         book = get_object_or_404(models.Book, **kwargs)
 761         url = book.zip_audiobooks()
 762     else:
 763         raise Http404('No format specified for zip package')
 764     return HttpResponseRedirect(urlquote_plus(settings.MEDIA_URL + url, safe='/?='))
 765
 766
 767 def download_custom_pdf(request, book_fileid):
 768     kwargs = models.Book.split_fileid(book_fileid)
 769     if kwargs is None:
 770         raise Http404
 771     book = get_object_or_404(models.Book, **kwargs)
 772
 773     if request.method == 'GET':
 774         form = forms.CustomPDFForm(request.GET)
 775         if form.is_valid():
 776             cust = form.customizations
 777             pdf_file = models.get_customized_pdf_path(book, cust)
 778
 779             if not path.exists(pdf_file):
 780                 result = async_build_pdf.delay(book.id, cust, pdf_file)
 781                 result.wait()
 782             return AttachmentHttpResponse(file_name=("%s.pdf" % book_fileid), file_path=pdf_file, mimetype="application/pdf")
 783         else:
 784             raise Http404(_('Incorrect customization options for PDF'))
 785     else:
 786         raise Http404(_('Bad method'))