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):
  76     books = models.Book.objects.all()
  77     form = forms.SearchForm()
  78
  79     books_by_first_letter = SortedDict()
  80     for book in books:
  81         books_by_first_letter.setdefault(book.title[0], []).append(book)
  82
  83     return render_to_response('catalogue/book_list.html', locals(),
  84         context_instance=RequestContext(request))
  85
  86
  87 def differentiate_tags(request, tags, ambiguous_slugs):
  88     beginning = '/'.join(tag.url_chunk for tag in tags)
  89     unparsed = '/'.join(ambiguous_slugs[1:])
  90     options = []
  91     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
  92         options.append({
  93             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
  94             'tags': [tag]
  95         })
  96     return render_to_response('catalogue/differentiate_tags.html',
  97                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
  98                 context_instance=RequestContext(request))
  99
 100
 101 def tagged_object_list(request, tags=''):
 102     try:
 103         tags = models.Tag.get_tag_list(tags)
 104     except models.Tag.DoesNotExist:
 105         raise Http404
 106     except models.Tag.MultipleObjectsReturned, e:
 107         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 108
 109     try:
 110         if len(tags) > settings.MAX_TAG_LIST:
 111             raise Http404
 112     except AttributeError:
 113         pass
 114
 115     if len([tag for tag in tags if tag.category == 'book']):
 116         raise Http404
 117
 118     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 119     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 120     only_shelf = shelf_is_set and len(tags) == 1
 121     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 122
 123     objects = only_author = pd_counter = None
 124     categories = {}
 125
 126     if theme_is_set:
 127         shelf_tags = [tag for tag in tags if tag.category == 'set']
 128         fragment_tags = [tag for tag in tags if tag.category != 'set']
 129         fragments = models.Fragment.tagged.with_all(fragment_tags)
 130
 131         if shelf_tags:
 132             books = models.Book.tagged.with_all(shelf_tags).order_by()
 133             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 134             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 135
 136         # newtagging goes crazy if we just try:
 137         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 138         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 139         fragment_keys = [fragment.pk for fragment in fragments]
 140         if fragment_keys:
 141             related_tags = models.Fragment.tags.usage(counts=True,
 142                                 filters={'pk__in': fragment_keys},
 143                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 144             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 145             categories = split_tags(related_tags)
 146
 147             objects = fragments
 148     else:
 149         # get relevant books and their tags
 150         objects = models.Book.tagged.with_all(tags).order_by()
 151         if not shelf_is_set:
 152             # eliminate descendants
 153             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in objects])
 154             descendants_keys = [book.pk for book in models.Book.tagged.with_any(l_tags)]
 155             if descendants_keys:
 156                 objects = objects.exclude(pk__in=descendants_keys)
 157
 158         # get related tags from `tag_counter` and `theme_counter`
 159         related_counts = {}
 160         tags_pks = [tag.pk for tag in tags]
 161         for book in objects:
 162             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 163                 if tag_pk in tags_pks:
 164                     continue
 165                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 166         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 167         related_tags = [tag for tag in related_tags if tag not in tags]
 168         for tag in related_tags:
 169             tag.count = related_counts[tag.pk]
 170
 171         categories = split_tags(related_tags)
 172         del related_tags
 173
 174     if not objects:
 175         only_author = len(tags) == 1 and tags[0].category == 'author'
 176         pd_counter = only_author and tags[0].goes_to_pd()
 177         objects = models.Book.objects.none()
 178
 179     return object_list(
 180         request,
 181         objects,
 182         template_name='catalogue/tagged_object_list.html',
 183         extra_context={
 184             'categories': categories,
 185             'only_shelf': only_shelf,
 186             'only_author': only_author,
 187             'pd_counter': pd_counter,
 188             'only_my_shelf': only_my_shelf,
 189             'formats_form': forms.DownloadFormatsForm(),
 190
 191             'tags': tags,
 192         }
 193     )
 194
 195
 196 def book_fragments(request, book_slug, theme_slug):
 197     book = get_object_or_404(models.Book, slug=book_slug)
 198     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 199     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 200     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 201
 202     form = forms.SearchForm()
 203     return render_to_response('catalogue/book_fragments.html', locals(),
 204         context_instance=RequestContext(request))
 205
 206
 207 def book_detail(request, slug):
 208     try:
 209         book = models.Book.objects.get(slug=slug)
 210     except models.Book.DoesNotExist:
 211         return book_stub_detail(request, slug)
 212
 213     book_tag = book.book_tag()
 214     tags = list(book.tags.filter(~Q(category='set')))
 215     categories = split_tags(tags)
 216     book_children = book.children.all().order_by('parent_number')
 217
 218     _book = book
 219     parents = []
 220     while _book.parent:
 221         parents.append(_book.parent)
 222         _book = _book.parent
 223     parents = reversed(parents)
 224
 225     theme_counter = book.theme_counter
 226     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 227     for tag in book_themes:
 228         tag.count = theme_counter[tag.pk]
 229
 230     extra_info = book.get_extra_info_value()
 231
 232     form = forms.SearchForm()
 233     return render_to_response('catalogue/book_detail.html', locals(),
 234         context_instance=RequestContext(request))
 235
 236
 237 def book_stub_detail(request, slug):
 238     book = get_object_or_404(models.BookStub, slug=slug)
 239     pd_counter = book.pd
 240     form = forms.SearchForm()
 241
 242     return render_to_response('catalogue/book_stub_detail.html', locals(),
 243         context_instance=RequestContext(request))
 244
 245
 246 def book_text(request, slug):
 247     book = get_object_or_404(models.Book, slug=slug)
 248     book_themes = {}
 249     for fragment in book.fragments.all():
 250         for theme in fragment.tags.filter(category='theme'):
 251             book_themes.setdefault(theme, []).append(fragment)
 252
 253     book_themes = book_themes.items()
 254     book_themes.sort(key=lambda s: s[0].sort_key)
 255     return render_to_response('catalogue/book_text.html', locals(),
 256         context_instance=RequestContext(request))
 257
 258
 259 # ==========
 260 # = Search =
 261 # ==========
 262
 263 def _no_diacritics_regexp(query):
 264     """ returns a regexp for searching for a query without diacritics
 265
 266     should be locale-aware """
 267     names = {
 268         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',
 269         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'
 270         }
 271     def repl(m):
 272         l = m.group()
 273         return u"(%s)" % '|'.join(names[l])
 274     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 275
 276 def unicode_re_escape(query):
 277     """ Unicode-friendly version of re.escape """
 278     return re.sub('(?u)(\W)', r'\\\1', query)
 279
 280 def _word_starts_with(name, prefix):
 281     """returns a Q object getting models having `name` contain a word
 282     starting with `prefix`
 283
 284     We define word characters as alphanumeric and underscore, like in JS.
 285
 286     Works for MySQL, PostgreSQL, Oracle.
 287     For SQLite, _sqlite* version is substituted for this.
 288     """
 289     kwargs = {}
 290
 291     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 292     # can't use [[:<:]] (word start),
 293     # but we want both `xy` and `(xy` to catch `(xyz)`
 294     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 295
 296     return Q(**kwargs)
 297
 298
 299 def _sqlite_word_starts_with(name, prefix):
 300     """ version of _word_starts_with for SQLite
 301
 302     SQLite in Django uses Python re module
 303     """
 304     kwargs = {}
 305     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 306     kwargs['%s__iregex' % name] = ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 307     return Q(**kwargs)
 308
 309
 310 if settings.DATABASE_ENGINE == 'sqlite3':
 311     _word_starts_with = _sqlite_word_starts_with
 312
 313
 314 def _tags_starting_with(prefix, user=None):
 315     prefix = prefix.lower()
 316     book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
 317     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 318     book_stubs = filter(lambda x: x not in books, book_stubs)
 319     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 320     if user and user.is_authenticated():
 321         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 322     else:
 323         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 324     return list(books) + list(tags) + list(book_stubs)
 325
 326
 327 def _get_result_link(match, tag_list):
 328     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 329         return match.get_absolute_url()
 330     else:
 331         return reverse('catalogue.views.tagged_object_list',
 332             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 333         )
 334
 335 def _get_result_type(match):
 336     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 337         type = 'book'
 338     else:
 339         type = match.category
 340     return type
 341
 342
 343
 344 def find_best_matches(query, user=None):
 345     """ Finds a Book, Tag or Bookstub best matching a query.
 346
 347     Returns a with:
 348       - zero elements when nothing is found,
 349       - one element when a best result is found,
 350       - more then one element on multiple exact matches
 351
 352     Raises a ValueError on too short a query.
 353     """
 354
 355     query = query.lower()
 356     if len(query) < 2:
 357         raise ValueError("query must have at least two characters")
 358
 359     result = tuple(_tags_starting_with(query, user))
 360     exact_matches = tuple(res for res in result if res.name.lower() == query)
 361     if exact_matches:
 362         return exact_matches
 363     else:
 364         return result[:1]
 365
 366
 367 def search(request):
 368     tags = request.GET.get('tags', '')
 369     prefix = request.GET.get('q', '')
 370
 371     try:
 372         tag_list = models.Tag.get_tag_list(tags)
 373     except:
 374         tag_list = []
 375
 376     try:
 377         result = find_best_matches(prefix, request.user)
 378     except ValueError:
 379         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 380             context_instance=RequestContext(request))
 381
 382     if len(result) == 1:
 383         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 384     elif len(result) > 1:
 385         return render_to_response('catalogue/search_multiple_hits.html',
 386             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 387             context_instance=RequestContext(request))
 388     else:
 389         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 390             context_instance=RequestContext(request))
 391
 392
 393 def tags_starting_with(request):
 394     prefix = request.GET.get('q', '')
 395     # Prefix must have at least 2 characters
 396     if len(prefix) < 2:
 397         return HttpResponse('')
 398     tags_list = []
 399     result = ""
 400     for tag in _tags_starting_with(prefix, request.user):
 401         if not tag.name in tags_list:
 402             result += "\n" + tag.name
 403             tags_list.append(tag.name)
 404     return HttpResponse(result)
 405
 406 def json_tags_starting_with(request, callback=None):
 407     # Callback for JSONP
 408     prefix = request.GET.get('q', '')
 409     callback = request.GET.get('callback', '')
 410     # Prefix must have at least 2 characters
 411     if len(prefix) < 2:
 412         return HttpResponse('')
 413     tags_list = []
 414     result = ""
 415     for tag in _tags_starting_with(prefix, request.user):
 416         if not tag.name in tags_list:
 417             result += "\n" + tag.name
 418             tags_list.append(tag.name)
 419     dict_result = {"matches": tags_list}
 420     return JSONResponse(dict_result, callback)
 421
 422 # ====================
 423 # = Shelf management =
 424 # ====================
 425 @login_required
 426 @cache.never_cache
 427 def user_shelves(request):
 428     shelves = models.Tag.objects.filter(category='set', user=request.user)
 429     new_set_form = forms.NewSetForm()
 430     return render_to_response('catalogue/user_shelves.html', locals(),
 431             context_instance=RequestContext(request))
 432
 433 @cache.never_cache
 434 def book_sets(request, slug):
 435     book = get_object_or_404(models.Book, slug=slug)
 436     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 437     book_sets = book.tags.filter(category='set', user=request.user)
 438
 439     if not request.user.is_authenticated():
 440         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 441
 442     if request.method == 'POST':
 443         form = forms.ObjectSetsForm(book, request.user, request.POST)
 444         if form.is_valid():
 445             old_shelves = list(book.tags.filter(category='set'))
 446             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 447
 448             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 449                 shelf.book_count = None
 450                 shelf.save()
 451
 452             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 453                 shelf.book_count = None
 454                 shelf.save()
 455
 456             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 457             if request.is_ajax():
 458                 return HttpResponse(_('<p>Shelves were sucessfully saved.</p>'))
 459             else:
 460                 return HttpResponseRedirect('/')
 461     else:
 462         form = forms.ObjectSetsForm(book, request.user)
 463         new_set_form = forms.NewSetForm()
 464
 465     return render_to_response('catalogue/book_sets.html', locals(),
 466         context_instance=RequestContext(request))
 467
 468
 469 @login_required
 470 @require_POST
 471 @cache.never_cache
 472 def remove_from_shelf(request, shelf, book):
 473     book = get_object_or_404(models.Book, slug=book)
 474     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 475
 476     if shelf in book.tags:
 477         models.Tag.objects.remove_tag(book, shelf)
 478
 479         shelf.book_count = None
 480         shelf.save()
 481
 482         return HttpResponse(_('Book was successfully removed from the shelf'))
 483     else:
 484         return HttpResponse(_('This book is not on the shelf'))
 485
 486
 487 def collect_books(books):
 488     """
 489     Returns all real books in collection.
 490     """
 491     result = []
 492     for book in books:
 493         if len(book.children.all()) == 0:
 494             result.append(book)
 495         else:
 496             result += collect_books(book.children.all())
 497     return result
 498
 499
 500 @cache.never_cache
 501 def download_shelf(request, slug):
 502     """"
 503     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 504     without loading the whole file into memory. A similar approach can
 505     be used for large dynamic PDF files.
 506     """
 507     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 508
 509     formats = []
 510     form = forms.DownloadFormatsForm(request.GET)
 511     if form.is_valid():
 512         formats = form.cleaned_data['formats']
 513     if len(formats) == 0:
 514         formats = ['pdf', 'epub', 'odt', 'txt', 'mp3', 'ogg']
 515
 516     # Create a ZIP archive
 517     temp = tempfile.TemporaryFile()
 518     archive = zipfile.ZipFile(temp, 'w')
 519
 520     for book in collect_books(models.Book.tagged.with_all(shelf)):
 521         if 'pdf' in formats and book.pdf_file:
 522             filename = book.pdf_file.path
 523             archive.write(filename, str('%s.pdf' % book.slug))
 524         if 'epub' in formats and book.epub_file:
 525             filename = book.epub_file.path
 526             archive.write(filename, str('%s.epub' % book.slug))
 527         if 'odt' in formats and book.odt_file:
 528             filename = book.odt_file.path
 529             archive.write(filename, str('%s.odt' % book.slug))
 530         if 'txt' in formats and book.txt_file:
 531             filename = book.txt_file.path
 532             archive.write(filename, str('%s.txt' % book.slug))
 533         if 'mp3' in formats and book.mp3_file:
 534             filename = book.mp3_file.path
 535             archive.write(filename, str('%s.mp3' % book.slug))
 536         if 'ogg' in formats and book.ogg_file:
 537             filename = book.ogg_file.path
 538             archive.write(filename, str('%s.ogg' % book.slug))
 539     archive.close()
 540
 541     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 542     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 543     response['Content-Length'] = temp.tell()
 544
 545     temp.seek(0)
 546     response.write(temp.read())
 547     return response
 548
 549
 550 @cache.never_cache
 551 def shelf_book_formats(request, shelf):
 552     """"
 553     Returns a list of formats of books in shelf.
 554     """
 555     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 556
 557     formats = {'pdf': False, 'epub': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False}
 558
 559     for book in collect_books(models.Book.tagged.with_all(shelf)):
 560         if book.pdf_file:
 561             formats['pdf'] = True
 562         if book.epub_file:
 563             formats['epub'] = True
 564         if book.odt_file:
 565             formats['odt'] = True
 566         if book.txt_file:
 567             formats['txt'] = True
 568         if book.mp3_file:
 569             formats['mp3'] = True
 570         if book.ogg_file:
 571             formats['ogg'] = True
 572
 573     return HttpResponse(LazyEncoder().encode(formats))
 574
 575
 576 @login_required
 577 @require_POST
 578 @cache.never_cache
 579 def new_set(request):
 580     new_set_form = forms.NewSetForm(request.POST)
 581     if new_set_form.is_valid():
 582         new_set = new_set_form.save(request.user)
 583
 584         if request.is_ajax():
 585             return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully created</p>') % new_set)
 586         else:
 587             return HttpResponseRedirect('/')
 588
 589     return HttpResponseRedirect('/')
 590
 591
 592 @login_required
 593 @require_POST
 594 @cache.never_cache
 595 def delete_shelf(request, slug):
 596     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 597     user_set.delete()
 598
 599     if request.is_ajax():
 600         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 601     else:
 602         return HttpResponseRedirect('/')
 603
 604
 605 # ==================
 606 # = Authentication =
 607 # ==================
 608 @require_POST
 609 @cache.never_cache
 610 def login(request):
 611     form = AuthenticationForm(data=request.POST, prefix='login')
 612     if form.is_valid():
 613         auth.login(request, form.get_user())
 614         response_data = {'success': True, 'errors': {}}
 615     else:
 616         response_data = {'success': False, 'errors': form.errors}
 617     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 618
 619
 620 @require_POST
 621 @cache.never_cache
 622 def register(request):
 623     registration_form = UserCreationForm(request.POST, prefix='registration')
 624     if registration_form.is_valid():
 625         user = registration_form.save()
 626         user = auth.authenticate(
 627             username=registration_form.cleaned_data['username'],
 628             password=registration_form.cleaned_data['password1']
 629         )
 630         auth.login(request, user)
 631         response_data = {'success': True, 'errors': {}}
 632     else:
 633         response_data = {'success': False, 'errors': registration_form.errors}
 634     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 635
 636
 637 @cache.never_cache
 638 def logout_then_redirect(request):
 639     auth.logout(request)
 640     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 641
 642
 643
 644 # =========
 645 # = Admin =
 646 # =========
 647 @login_required
 648 @staff_required
 649 def import_book(request):
 650     """docstring for import_book"""
 651     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 652     if book_import_form.is_valid():
 653         try:
 654             book_import_form.save()
 655         except:
 656             info = sys.exc_info()
 657             exception = pprint.pformat(info[1])
 658             tb = '\n'.join(traceback.format_tb(info[2]))
 659             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 660         return HttpResponse(_("Book imported successfully"))
 661     else:
 662         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 663
 664
 665
 666 def clock(request):
 667     """ Provides server time for jquery.countdown,
 668     in a format suitable for Date.parse()
 669     """
 670     from datetime import datetime
 671     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))