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 tempfile
   6 import zipfile
   7 import sys
   8 import pprint
   9 import traceback
  10 import re
  11 import itertools
  12 from operator import itemgetter
  13
  14 from django.conf import settings
  15 from django.template import RequestContext
  16 from django.shortcuts import render_to_response, get_object_or_404
  17 from django.http import HttpResponse, HttpResponseRedirect, Http404
  18 from django.core.urlresolvers import reverse
  19 from django.db.models import Q
  20 from django.contrib.auth.decorators import login_required, user_passes_test
  21 from django.utils.datastructures import SortedDict
  22 from django.views.decorators.http import require_POST
  23 from django.contrib import auth
  24 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  25 from django.utils import simplejson
  26 from django.utils.functional import Promise
  27 from django.utils.encoding import force_unicode
  28 from django.utils.http import urlquote_plus
  29 from django.views.decorators import cache
  30 from django.utils.translation import ugettext as _
  31 from django.views.generic.list_detail import object_list
  32
  33 from catalogue import models
  34 from catalogue import forms
  35 from catalogue.utils import split_tags
  36 from newtagging import views as newtagging_views
  37
  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 main_page(request):
  60     if request.user.is_authenticated():
  61         shelves = models.Tag.objects.filter(category='set', user=request.user)
  62         new_set_form = forms.NewSetForm()
  63
  64     tags = models.Tag.objects.exclude(category__in=('set', 'book'))
  65     for tag in tags:
  66         tag.count = tag.get_count()
  67     categories = split_tags(tags)
  68     fragment_tags = categories.get('theme', [])
  69
  70     form = forms.SearchForm()
  71     return render_to_response('catalogue/main_page.html', locals(),
  72         context_instance=RequestContext(request))
  73
  74
  75 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  76     """ generates a listing of all books, optionally filtered with a test function """
  77
  78     form = forms.SearchForm()
  79
  80     books_by_parent = {}
  81     books = models.Book.objects.all().order_by('parent_number', 'title').only('title', 'parent', 'slug')
  82     if filter:
  83         books = books.filter(filter)
  84         book_ids = set((book.pk for book in books))
  85         for book in books:
  86             parent = book.parent_id
  87             if parent not in book_ids:
  88                 parent = None
  89             books_by_parent.setdefault(parent, []).append(book)
  90     else:
  91         for book in books:
  92             books_by_parent.setdefault(book.parent_id, []).append(book)
  93
  94     orphans = []
  95     books_by_author = SortedDict()
  96     books_nav = SortedDict()
  97     for tag in models.Tag.objects.filter(category='author'):
  98         books_by_author[tag] = []
  99
 100     for book in books_by_parent.get(None,()):
 101         authors = list(book.tags.filter(category='author'))
 102         if authors:
 103             for author in authors:
 104                 books_by_author[author].append(book)
 105         else:
 106             orphans.append(book)
 107
 108     for tag in books_by_author:
 109         if books_by_author[tag]:
 110             books_nav.setdefault(tag.sort_key[0], []).append(tag)
 111
 112     return render_to_response(template_name, locals(),
 113         context_instance=RequestContext(request))
 114
 115
 116 def audiobook_list(request):
 117     return book_list(request, ~Q(mp3_file='') | ~Q(ogg_file=''),
 118                      template_name='catalogue/audiobook_list.html')
 119
 120
 121 def daisy_list(request):
 122     return book_list(request, ~Q(daisy_file=''),
 123                      template_name='catalogue/daisy_list.html')
 124
 125
 126 def differentiate_tags(request, tags, ambiguous_slugs):
 127     beginning = '/'.join(tag.url_chunk for tag in tags)
 128     unparsed = '/'.join(ambiguous_slugs[1:])
 129     options = []
 130     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 131         options.append({
 132             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 133             'tags': [tag]
 134         })
 135     return render_to_response('catalogue/differentiate_tags.html',
 136                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 137                 context_instance=RequestContext(request))
 138
 139
 140 def tagged_object_list(request, tags=''):
 141     try:
 142         tags = models.Tag.get_tag_list(tags)
 143     except models.Tag.DoesNotExist:
 144         raise Http404
 145     except models.Tag.MultipleObjectsReturned, e:
 146         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 147
 148     try:
 149         if len(tags) > settings.MAX_TAG_LIST:
 150             raise Http404
 151     except AttributeError:
 152         pass
 153
 154     if len([tag for tag in tags if tag.category == 'book']):
 155         raise Http404
 156
 157     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 158     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 159     only_shelf = shelf_is_set and len(tags) == 1
 160     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 161
 162     objects = only_author = pd_counter = None
 163     categories = {}
 164
 165     if theme_is_set:
 166         shelf_tags = [tag for tag in tags if tag.category == 'set']
 167         fragment_tags = [tag for tag in tags if tag.category != 'set']
 168         fragments = models.Fragment.tagged.with_all(fragment_tags)
 169
 170         if shelf_tags:
 171             books = models.Book.tagged.with_all(shelf_tags).order_by()
 172             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 173             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 174
 175         # newtagging goes crazy if we just try:
 176         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 177         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 178         fragment_keys = [fragment.pk for fragment in fragments]
 179         if fragment_keys:
 180             related_tags = models.Fragment.tags.usage(counts=True,
 181                                 filters={'pk__in': fragment_keys},
 182                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 183             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 184             categories = split_tags(related_tags)
 185
 186             objects = fragments
 187     else:
 188         # get relevant books and their tags
 189         objects = models.Book.tagged.with_all(tags)
 190         if not shelf_is_set:
 191             # eliminate descendants
 192             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in objects])
 193             descendants_keys = [book.pk for book in models.Book.tagged.with_any(l_tags)]
 194             if descendants_keys:
 195                 objects = objects.exclude(pk__in=descendants_keys)
 196
 197         # get related tags from `tag_counter` and `theme_counter`
 198         related_counts = {}
 199         tags_pks = [tag.pk for tag in tags]
 200         for book in objects:
 201             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 202                 if tag_pk in tags_pks:
 203                     continue
 204                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 205         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 206         related_tags = [tag for tag in related_tags if tag not in tags]
 207         for tag in related_tags:
 208             tag.count = related_counts[tag.pk]
 209
 210         categories = split_tags(related_tags)
 211         del related_tags
 212
 213     if not objects:
 214         only_author = len(tags) == 1 and tags[0].category == 'author'
 215         pd_counter = only_author and tags[0].goes_to_pd()
 216         objects = models.Book.objects.none()
 217
 218     return object_list(
 219         request,
 220         objects,
 221         template_name='catalogue/tagged_object_list.html',
 222         extra_context={
 223             'categories': categories,
 224             'only_shelf': only_shelf,
 225             'only_author': only_author,
 226             'pd_counter': pd_counter,
 227             'only_my_shelf': only_my_shelf,
 228             'formats_form': forms.DownloadFormatsForm(),
 229
 230             'tags': tags,
 231         }
 232     )
 233
 234
 235 def book_fragments(request, book_slug, theme_slug):
 236     book = get_object_or_404(models.Book, slug=book_slug)
 237     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 238     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 239     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 240
 241     form = forms.SearchForm()
 242     return render_to_response('catalogue/book_fragments.html', locals(),
 243         context_instance=RequestContext(request))
 244
 245
 246 def book_detail(request, slug):
 247     try:
 248         book = models.Book.objects.get(slug=slug)
 249     except models.Book.DoesNotExist:
 250         return book_stub_detail(request, slug)
 251
 252     book_tag = book.book_tag()
 253     tags = list(book.tags.filter(~Q(category='set')))
 254     categories = split_tags(tags)
 255     book_children = book.children.all().order_by('parent_number')
 256
 257     _book = book
 258     parents = []
 259     while _book.parent:
 260         parents.append(_book.parent)
 261         _book = _book.parent
 262     parents = reversed(parents)
 263
 264     theme_counter = book.theme_counter
 265     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 266     for tag in book_themes:
 267         tag.count = theme_counter[tag.pk]
 268
 269     extra_info = book.get_extra_info_value()
 270
 271     form = forms.SearchForm()
 272     return render_to_response('catalogue/book_detail.html', locals(),
 273         context_instance=RequestContext(request))
 274
 275
 276 def book_stub_detail(request, slug):
 277     book = get_object_or_404(models.BookStub, slug=slug)
 278     pd_counter = book.pd
 279     form = forms.SearchForm()
 280
 281     return render_to_response('catalogue/book_stub_detail.html', locals(),
 282         context_instance=RequestContext(request))
 283
 284
 285 def book_text(request, slug):
 286     book = get_object_or_404(models.Book, slug=slug)
 287     if not book.has_html_file():
 288         raise Http404
 289     book_themes = {}
 290     for fragment in book.fragments.all():
 291         for theme in fragment.tags.filter(category='theme'):
 292             book_themes.setdefault(theme, []).append(fragment)
 293
 294     book_themes = book_themes.items()
 295     book_themes.sort(key=lambda s: s[0].sort_key)
 296     return render_to_response('catalogue/book_text.html', locals(),
 297         context_instance=RequestContext(request))
 298
 299
 300 # ==========
 301 # = Search =
 302 # ==========
 303
 304 def _no_diacritics_regexp(query):
 305     """ returns a regexp for searching for a query without diacritics
 306
 307     should be locale-aware """
 308     names = {
 309         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',
 310         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'
 311         }
 312     def repl(m):
 313         l = m.group()
 314         return u"(%s)" % '|'.join(names[l])
 315     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 316
 317 def unicode_re_escape(query):
 318     """ Unicode-friendly version of re.escape """
 319     return re.sub('(?u)(\W)', r'\\\1', query)
 320
 321 def _word_starts_with(name, prefix):
 322     """returns a Q object getting models having `name` contain a word
 323     starting with `prefix`
 324
 325     We define word characters as alphanumeric and underscore, like in JS.
 326
 327     Works for MySQL, PostgreSQL, Oracle.
 328     For SQLite, _sqlite* version is substituted for this.
 329     """
 330     kwargs = {}
 331
 332     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 333     # can't use [[:<:]] (word start),
 334     # but we want both `xy` and `(xy` to catch `(xyz)`
 335     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 336
 337     return Q(**kwargs)
 338
 339
 340 def _sqlite_word_starts_with(name, prefix):
 341     """ version of _word_starts_with for SQLite
 342
 343     SQLite in Django uses Python re module
 344     """
 345     kwargs = {}
 346     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 347     kwargs['%s__iregex' % name] = ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 348     return Q(**kwargs)
 349
 350
 351 if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 352     _word_starts_with = _sqlite_word_starts_with
 353
 354
 355 def _tags_starting_with(prefix, user=None):
 356     prefix = prefix.lower()
 357     book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
 358     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 359     book_stubs = filter(lambda x: x not in books, book_stubs)
 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     return list(books) + list(tags) + list(book_stubs)
 366
 367
 368 def _get_result_link(match, tag_list):
 369     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 370         return match.get_absolute_url()
 371     else:
 372         return reverse('catalogue.views.tagged_object_list',
 373             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 374         )
 375
 376 def _get_result_type(match):
 377     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 378         type = 'book'
 379     else:
 380         type = match.category
 381     return type
 382
 383
 384 def books_starting_with(prefix):
 385     prefix = prefix.lower()
 386     return models.Book.objects.filter(_word_starts_with('title', prefix))
 387
 388
 389 def find_best_matches(query, user=None):
 390     """ Finds a Book, Tag or Bookstub best matching a query.
 391
 392     Returns a with:
 393       - zero elements when nothing is found,
 394       - one element when a best result is found,
 395       - more then one element on multiple exact matches
 396
 397     Raises a ValueError on too short a query.
 398     """
 399
 400     query = query.lower()
 401     if len(query) < 2:
 402         raise ValueError("query must have at least two characters")
 403
 404     result = tuple(_tags_starting_with(query, user))
 405     exact_matches = tuple(res for res in result if res.name.lower() == query)
 406     if exact_matches:
 407         return exact_matches
 408     else:
 409         return result[:1]
 410
 411
 412 def search(request):
 413     tags = request.GET.get('tags', '')
 414     prefix = request.GET.get('q', '')
 415
 416     try:
 417         tag_list = models.Tag.get_tag_list(tags)
 418     except:
 419         tag_list = []
 420
 421     try:
 422         result = find_best_matches(prefix, request.user)
 423     except ValueError:
 424         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 425             context_instance=RequestContext(request))
 426
 427     if len(result) == 1:
 428         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 429     elif len(result) > 1:
 430         return render_to_response('catalogue/search_multiple_hits.html',
 431             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 432             context_instance=RequestContext(request))
 433     else:
 434         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 435             context_instance=RequestContext(request))
 436
 437
 438 def tags_starting_with(request):
 439     prefix = request.GET.get('q', '')
 440     # Prefix must have at least 2 characters
 441     if len(prefix) < 2:
 442         return HttpResponse('')
 443     tags_list = []
 444     result = ""
 445     for tag in _tags_starting_with(prefix, request.user):
 446         if not tag.name in tags_list:
 447             result += "\n" + tag.name
 448             tags_list.append(tag.name)
 449     return HttpResponse(result)
 450
 451 def json_tags_starting_with(request, callback=None):
 452     # Callback for JSONP
 453     prefix = request.GET.get('q', '')
 454     callback = request.GET.get('callback', '')
 455     # Prefix must have at least 2 characters
 456     if len(prefix) < 2:
 457         return HttpResponse('')
 458     tags_list = []
 459     result = ""
 460     for tag in _tags_starting_with(prefix, request.user):
 461         if not tag.name in tags_list:
 462             result += "\n" + tag.name
 463             tags_list.append(tag.name)
 464     dict_result = {"matches": tags_list}
 465     return JSONResponse(dict_result, callback)
 466
 467 # ====================
 468 # = Shelf management =
 469 # ====================
 470 @login_required
 471 @cache.never_cache
 472 def user_shelves(request):
 473     shelves = models.Tag.objects.filter(category='set', user=request.user)
 474     new_set_form = forms.NewSetForm()
 475     return render_to_response('catalogue/user_shelves.html', locals(),
 476             context_instance=RequestContext(request))
 477
 478 @cache.never_cache
 479 def book_sets(request, slug):
 480     if not request.user.is_authenticated():
 481         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 482
 483     book = get_object_or_404(models.Book, slug=slug)
 484     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 485     book_sets = book.tags.filter(category='set', user=request.user)
 486
 487     if request.method == 'POST':
 488         form = forms.ObjectSetsForm(book, request.user, request.POST)
 489         if form.is_valid():
 490             old_shelves = list(book.tags.filter(category='set'))
 491             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 492
 493             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 494                 shelf.book_count = None
 495                 shelf.save()
 496
 497             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 498                 shelf.book_count = None
 499                 shelf.save()
 500
 501             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 502             if request.is_ajax():
 503                 return HttpResponse(_('<p>Shelves were sucessfully saved.</p>'))
 504             else:
 505                 return HttpResponseRedirect('/')
 506     else:
 507         form = forms.ObjectSetsForm(book, request.user)
 508         new_set_form = forms.NewSetForm()
 509
 510     return render_to_response('catalogue/book_sets.html', locals(),
 511         context_instance=RequestContext(request))
 512
 513
 514 @login_required
 515 @require_POST
 516 @cache.never_cache
 517 def remove_from_shelf(request, shelf, book):
 518     book = get_object_or_404(models.Book, slug=book)
 519     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 520
 521     if shelf in book.tags:
 522         models.Tag.objects.remove_tag(book, shelf)
 523
 524         shelf.book_count = None
 525         shelf.save()
 526
 527         return HttpResponse(_('Book was successfully removed from the shelf'))
 528     else:
 529         return HttpResponse(_('This book is not on the shelf'))
 530
 531
 532 def collect_books(books):
 533     """
 534     Returns all real books in collection.
 535     """
 536     result = []
 537     for book in books:
 538         if len(book.children.all()) == 0:
 539             result.append(book)
 540         else:
 541             result += collect_books(book.children.all())
 542     return result
 543
 544
 545 @cache.never_cache
 546 def download_shelf(request, slug):
 547     """"
 548     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 549     without loading the whole file into memory. A similar approach can
 550     be used for large dynamic PDF files.
 551     """
 552     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 553
 554     formats = []
 555     form = forms.DownloadFormatsForm(request.GET)
 556     if form.is_valid():
 557         formats = form.cleaned_data['formats']
 558     if len(formats) == 0:
 559         formats = ['pdf', 'epub', 'odt', 'txt', 'mp3', 'ogg', 'daisy']
 560
 561     # Create a ZIP archive
 562     temp = tempfile.TemporaryFile()
 563     archive = zipfile.ZipFile(temp, 'w')
 564
 565     already = set()
 566     for book in collect_books(models.Book.tagged.with_all(shelf)):
 567         if 'pdf' in formats and book.pdf_file:
 568             filename = book.pdf_file.path
 569             archive.write(filename, str('%s.pdf' % book.slug))
 570         if book.root_ancestor not in already and 'epub' in formats and book.root_ancestor.epub_file:
 571             filename = book.root_ancestor.epub_file.path
 572             archive.write(filename, str('%s.epub' % book.root_ancestor.slug))
 573             already.add(book.root_ancestor)
 574         if 'odt' in formats and book.odt_file:
 575             filename = book.odt_file.path
 576             archive.write(filename, str('%s.odt' % book.slug))
 577         if 'txt' in formats and book.txt_file:
 578             filename = book.txt_file.path
 579             archive.write(filename, str('%s.txt' % book.slug))
 580         if 'mp3' in formats and book.mp3_file:
 581             filename = book.mp3_file.path
 582             archive.write(filename, str('%s.mp3' % book.slug))
 583         if 'ogg' in formats and book.ogg_file:
 584             filename = book.ogg_file.path
 585             archive.write(filename, str('%s.ogg' % book.slug))
 586         if 'daisy' in formats and book.daisy_file:
 587             filename = book.daisy_file.path
 588             archive.write(filename, str('%s.daisy.zip' % book.slug))
 589     archive.close()
 590
 591     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 592     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 593     response['Content-Length'] = temp.tell()
 594
 595     temp.seek(0)
 596     response.write(temp.read())
 597     return response
 598
 599
 600 @cache.never_cache
 601 def shelf_book_formats(request, shelf):
 602     """"
 603     Returns a list of formats of books in shelf.
 604     """
 605     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 606
 607     formats = {'pdf': False, 'epub': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False, 'daisy': False}
 608
 609     for book in collect_books(models.Book.tagged.with_all(shelf)):
 610         if book.pdf_file:
 611             formats['pdf'] = True
 612         if book.root_ancestor.epub_file:
 613             formats['epub'] = True
 614         if book.odt_file:
 615             formats['odt'] = True
 616         if book.txt_file:
 617             formats['txt'] = True
 618         if book.mp3_file:
 619             formats['mp3'] = True
 620         if book.ogg_file:
 621             formats['ogg'] = True
 622         if book.daisy_file:
 623             formats['daisy'] = True
 624
 625     return HttpResponse(LazyEncoder().encode(formats))
 626
 627
 628 @login_required
 629 @require_POST
 630 @cache.never_cache
 631 def new_set(request):
 632     new_set_form = forms.NewSetForm(request.POST)
 633     if new_set_form.is_valid():
 634         new_set = new_set_form.save(request.user)
 635
 636         if request.is_ajax():
 637             return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully created</p>') % new_set)
 638         else:
 639             return HttpResponseRedirect('/')
 640
 641     return HttpResponseRedirect('/')
 642
 643
 644 @login_required
 645 @require_POST
 646 @cache.never_cache
 647 def delete_shelf(request, slug):
 648     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 649     user_set.delete()
 650
 651     if request.is_ajax():
 652         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 653     else:
 654         return HttpResponseRedirect('/')
 655
 656
 657 # ==================
 658 # = Authentication =
 659 # ==================
 660 @require_POST
 661 @cache.never_cache
 662 def login(request):
 663     form = AuthenticationForm(data=request.POST, prefix='login')
 664     if form.is_valid():
 665         auth.login(request, form.get_user())
 666         response_data = {'success': True, 'errors': {}}
 667     else:
 668         response_data = {'success': False, 'errors': form.errors}
 669     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 670
 671
 672 @require_POST
 673 @cache.never_cache
 674 def register(request):
 675     registration_form = UserCreationForm(request.POST, prefix='registration')
 676     if registration_form.is_valid():
 677         user = registration_form.save()
 678         user = auth.authenticate(
 679             username=registration_form.cleaned_data['username'],
 680             password=registration_form.cleaned_data['password1']
 681         )
 682         auth.login(request, user)
 683         response_data = {'success': True, 'errors': {}}
 684     else:
 685         response_data = {'success': False, 'errors': registration_form.errors}
 686     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 687
 688
 689 @cache.never_cache
 690 def logout_then_redirect(request):
 691     auth.logout(request)
 692     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 693
 694
 695
 696 # =========
 697 # = Admin =
 698 # =========
 699 @login_required
 700 @staff_required
 701 def import_book(request):
 702     """docstring for import_book"""
 703     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 704     if book_import_form.is_valid():
 705         try:
 706             book_import_form.save()
 707         except:
 708             info = sys.exc_info()
 709             exception = pprint.pformat(info[1])
 710             tb = '\n'.join(traceback.format_tb(info[2]))
 711             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 712         return HttpResponse(_("Book imported successfully"))
 713     else:
 714         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 715
 716
 717
 718 def clock(request):
 719     """ Provides server time for jquery.countdown,
 720     in a format suitable for Date.parse()
 721     """
 722     from datetime import datetime
 723     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))