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     theme_counter = book.theme_counter
 219     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 220     for tag in book_themes:
 221         tag.count = theme_counter[tag.pk]
 222
 223     extra_info = book.get_extra_info_value()
 224
 225     form = forms.SearchForm()
 226     return render_to_response('catalogue/book_detail.html', locals(),
 227         context_instance=RequestContext(request))
 228
 229
 230 def book_stub_detail(request, slug):
 231     book = get_object_or_404(models.BookStub, slug=slug)
 232     pd_counter = book.pd
 233     form = forms.SearchForm()
 234
 235     return render_to_response('catalogue/book_stub_detail.html', locals(),
 236         context_instance=RequestContext(request))
 237
 238
 239 def book_text(request, slug):
 240     book = get_object_or_404(models.Book, slug=slug)
 241     book_themes = {}
 242     for fragment in book.fragments.all():
 243         for theme in fragment.tags.filter(category='theme'):
 244             book_themes.setdefault(theme, []).append(fragment)
 245
 246     book_themes = book_themes.items()
 247     book_themes.sort(key=lambda s: s[0].sort_key)
 248     return render_to_response('catalogue/book_text.html', locals(),
 249         context_instance=RequestContext(request))
 250
 251
 252 # ==========
 253 # = Search =
 254 # ==========
 255
 256 def _no_diacritics_regexp(query):
 257     """ returns a regexp for searching for a query without diacritics
 258
 259     should be locale-aware """
 260     names = {
 261         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',
 262         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'
 263         }
 264     def repl(m):
 265         l = m.group()
 266         return u"(%s)" % '|'.join(names[l])
 267     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 268
 269 def unicode_re_escape(query):
 270     """ Unicode-friendly version of re.escape """
 271     return re.sub('(?u)(\W)', r'\\\1', query)
 272
 273 def _word_starts_with(name, prefix):
 274     """returns a Q object getting models having `name` contain a word
 275     starting with `prefix`
 276
 277     We define word characters as alphanumeric and underscore, like in JS.
 278
 279     Works for MySQL, PostgreSQL, Oracle.
 280     For SQLite, _sqlite* version is substituted for this.
 281     """
 282     kwargs = {}
 283
 284     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 285     # can't use [[:<:]] (word start),
 286     # but we want both `xy` and `(xy` to catch `(xyz)`
 287     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 288
 289     return Q(**kwargs)
 290
 291
 292 def _sqlite_word_starts_with(name, prefix):
 293     """ version of _word_starts_with for SQLite
 294
 295     SQLite in Django uses Python re module
 296     """
 297     kwargs = {}
 298     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 299     kwargs['%s__iregex' % name] = ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 300     return Q(**kwargs)
 301
 302
 303 if settings.DATABASE_ENGINE == 'sqlite3':
 304     _word_starts_with = _sqlite_word_starts_with
 305
 306
 307 def _tags_starting_with(prefix, user=None):
 308     prefix = prefix.lower()
 309     book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
 310     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 311     book_stubs = filter(lambda x: x not in books, book_stubs)
 312     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 313     if user and user.is_authenticated():
 314         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 315     else:
 316         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 317     return list(books) + list(tags) + list(book_stubs)
 318
 319
 320 def _get_result_link(match, tag_list):
 321     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 322         return match.get_absolute_url()
 323     else:
 324         return reverse('catalogue.views.tagged_object_list',
 325             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 326         )
 327
 328 def _get_result_type(match):
 329     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 330         type = 'book'
 331     else:
 332         type = match.category
 333     return type
 334
 335
 336
 337 def find_best_matches(query, user=None):
 338     """ Finds a Book, Tag or Bookstub best matching a query.
 339
 340     Returns a with:
 341       - zero elements when nothing is found,
 342       - one element when a best result is found,
 343       - more then one element on multiple exact matches
 344
 345     Raises a ValueError on too short a query.
 346     """
 347
 348     query = query.lower()
 349     if len(query) < 2:
 350         raise ValueError("query must have at least two characters")
 351
 352     result = tuple(_tags_starting_with(query, user))
 353     exact_matches = tuple(res for res in result if res.name.lower() == query)
 354     if exact_matches:
 355         return exact_matches
 356     else:
 357         return result[:1]
 358
 359
 360 def search(request):
 361     tags = request.GET.get('tags', '')
 362     prefix = request.GET.get('q', '')
 363
 364     try:
 365         tag_list = models.Tag.get_tag_list(tags)
 366     except:
 367         tag_list = []
 368
 369     try:
 370         result = find_best_matches(prefix, request.user)
 371     except ValueError:
 372         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 373             context_instance=RequestContext(request))
 374
 375     if len(result) == 1:
 376         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 377     elif len(result) > 1:
 378         return render_to_response('catalogue/search_multiple_hits.html',
 379             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 380             context_instance=RequestContext(request))
 381     else:
 382         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 383             context_instance=RequestContext(request))
 384
 385
 386 def tags_starting_with(request):
 387     prefix = request.GET.get('q', '')
 388     # Prefix must have at least 2 characters
 389     if len(prefix) < 2:
 390         return HttpResponse('')
 391     tags_list = []
 392     result = ""
 393     for tag in _tags_starting_with(prefix, request.user):
 394         if not tag.name in tags_list:
 395             result += "\n" + tag.name
 396             tags_list.append(tag.name)
 397     return HttpResponse(result)
 398
 399 def json_tags_starting_with(request, callback=None):
 400     # Callback for JSONP
 401     prefix = request.GET.get('q', '')
 402     callback = request.GET.get('callback', '')
 403     # Prefix must have at least 2 characters
 404     if len(prefix) < 2:
 405         return HttpResponse('')
 406     tags_list = []
 407     result = ""
 408     for tag in _tags_starting_with(prefix, request.user):
 409         if not tag.name in tags_list:
 410             result += "\n" + tag.name
 411             tags_list.append(tag.name)
 412     dict_result = {"matches": tags_list}
 413     return JSONResponse(dict_result, callback)
 414
 415 # ====================
 416 # = Shelf management =
 417 # ====================
 418 @login_required
 419 @cache.never_cache
 420 def user_shelves(request):
 421     shelves = models.Tag.objects.filter(category='set', user=request.user)
 422     new_set_form = forms.NewSetForm()
 423     return render_to_response('catalogue/user_shelves.html', locals(),
 424             context_instance=RequestContext(request))
 425
 426 @cache.never_cache
 427 def book_sets(request, slug):
 428     book = get_object_or_404(models.Book, slug=slug)
 429     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 430     book_sets = book.tags.filter(category='set', user=request.user)
 431
 432     if not request.user.is_authenticated():
 433         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 434
 435     if request.method == 'POST':
 436         form = forms.ObjectSetsForm(book, request.user, request.POST)
 437         if form.is_valid():
 438             old_shelves = list(book.tags.filter(category='set'))
 439             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 440
 441             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 442                 shelf.book_count = None
 443                 shelf.save()
 444
 445             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 446                 shelf.book_count = None
 447                 shelf.save()
 448
 449             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 450             if request.is_ajax():
 451                 return HttpResponse(_('<p>Shelves were sucessfully saved.</p>'))
 452             else:
 453                 return HttpResponseRedirect('/')
 454     else:
 455         form = forms.ObjectSetsForm(book, request.user)
 456         new_set_form = forms.NewSetForm()
 457
 458     return render_to_response('catalogue/book_sets.html', locals(),
 459         context_instance=RequestContext(request))
 460
 461
 462 @login_required
 463 @require_POST
 464 @cache.never_cache
 465 def remove_from_shelf(request, shelf, book):
 466     book = get_object_or_404(models.Book, slug=book)
 467     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 468
 469     if shelf in book.tags:
 470         models.Tag.objects.remove_tag(book, shelf)
 471
 472         shelf.book_count = None
 473         shelf.save()
 474
 475         return HttpResponse(_('Book was successfully removed from the shelf'))
 476     else:
 477         return HttpResponse(_('This book is not on the shelf'))
 478
 479
 480 def collect_books(books):
 481     """
 482     Returns all real books in collection.
 483     """
 484     result = []
 485     for book in books:
 486         if len(book.children.all()) == 0:
 487             result.append(book)
 488         else:
 489             result += collect_books(book.children.all())
 490     return result
 491
 492
 493 @cache.never_cache
 494 def download_shelf(request, slug):
 495     """"
 496     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 497     without loading the whole file into memory. A similar approach can
 498     be used for large dynamic PDF files.
 499     """
 500     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 501
 502     formats = []
 503     form = forms.DownloadFormatsForm(request.GET)
 504     if form.is_valid():
 505         formats = form.cleaned_data['formats']
 506     if len(formats) == 0:
 507         formats = ['pdf', 'epub', 'odt', 'txt', 'mp3', 'ogg']
 508
 509     # Create a ZIP archive
 510     temp = tempfile.TemporaryFile()
 511     archive = zipfile.ZipFile(temp, 'w')
 512
 513     for book in collect_books(models.Book.tagged.with_all(shelf)):
 514         if 'pdf' in formats and book.pdf_file:
 515             filename = book.pdf_file.path
 516             archive.write(filename, str('%s.pdf' % book.slug))
 517         if 'epub' in formats and book.epub_file:
 518             filename = book.epub_file.path
 519             archive.write(filename, str('%s.epub' % book.slug))
 520         if 'odt' in formats and book.odt_file:
 521             filename = book.odt_file.path
 522             archive.write(filename, str('%s.odt' % book.slug))
 523         if 'txt' in formats and book.txt_file:
 524             filename = book.txt_file.path
 525             archive.write(filename, str('%s.txt' % book.slug))
 526         if 'mp3' in formats and book.mp3_file:
 527             filename = book.mp3_file.path
 528             archive.write(filename, str('%s.mp3' % book.slug))
 529         if 'ogg' in formats and book.ogg_file:
 530             filename = book.ogg_file.path
 531             archive.write(filename, str('%s.ogg' % book.slug))
 532     archive.close()
 533
 534     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 535     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 536     response['Content-Length'] = temp.tell()
 537
 538     temp.seek(0)
 539     response.write(temp.read())
 540     return response
 541
 542
 543 @cache.never_cache
 544 def shelf_book_formats(request, shelf):
 545     """"
 546     Returns a list of formats of books in shelf.
 547     """
 548     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 549
 550     formats = {'pdf': False, 'epub': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False}
 551
 552     for book in collect_books(models.Book.tagged.with_all(shelf)):
 553         if book.pdf_file:
 554             formats['pdf'] = True
 555         if book.epub_file:
 556             formats['epub'] = True
 557         if book.odt_file:
 558             formats['odt'] = True
 559         if book.txt_file:
 560             formats['txt'] = True
 561         if book.mp3_file:
 562             formats['mp3'] = True
 563         if book.ogg_file:
 564             formats['ogg'] = True
 565
 566     return HttpResponse(LazyEncoder().encode(formats))
 567
 568
 569 @login_required
 570 @require_POST
 571 @cache.never_cache
 572 def new_set(request):
 573     new_set_form = forms.NewSetForm(request.POST)
 574     if new_set_form.is_valid():
 575         new_set = new_set_form.save(request.user)
 576
 577         if request.is_ajax():
 578             return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully created</p>') % new_set)
 579         else:
 580             return HttpResponseRedirect('/')
 581
 582     return HttpResponseRedirect('/')
 583
 584
 585 @login_required
 586 @require_POST
 587 @cache.never_cache
 588 def delete_shelf(request, slug):
 589     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 590     user_set.delete()
 591
 592     if request.is_ajax():
 593         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 594     else:
 595         return HttpResponseRedirect('/')
 596
 597
 598 # ==================
 599 # = Authentication =
 600 # ==================
 601 @require_POST
 602 @cache.never_cache
 603 def login(request):
 604     form = AuthenticationForm(data=request.POST, prefix='login')
 605     if form.is_valid():
 606         auth.login(request, form.get_user())
 607         response_data = {'success': True, 'errors': {}}
 608     else:
 609         response_data = {'success': False, 'errors': form.errors}
 610     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 611
 612
 613 @require_POST
 614 @cache.never_cache
 615 def register(request):
 616     registration_form = UserCreationForm(request.POST, prefix='registration')
 617     if registration_form.is_valid():
 618         user = registration_form.save()
 619         user = auth.authenticate(
 620             username=registration_form.cleaned_data['username'],
 621             password=registration_form.cleaned_data['password1']
 622         )
 623         auth.login(request, user)
 624         response_data = {'success': True, 'errors': {}}
 625     else:
 626         response_data = {'success': False, 'errors': registration_form.errors}
 627     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 628
 629
 630 @cache.never_cache
 631 def logout_then_redirect(request):
 632     auth.logout(request)
 633     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 634
 635
 636
 637 # =========
 638 # = Admin =
 639 # =========
 640 @login_required
 641 @staff_required
 642 def import_book(request):
 643     """docstring for import_book"""
 644     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 645     if book_import_form.is_valid():
 646         try:
 647             book_import_form.save()
 648         except:
 649             info = sys.exc_info()
 650             exception = pprint.pformat(info[1])
 651             tb = '\n'.join(traceback.format_tb(info[2]))
 652             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 653         return HttpResponse(_("Book imported successfully"))
 654     else:
 655         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 656
 657
 658
 659 def clock(request):
 660     """ Provides server time for jquery.countdown,
 661     in a format suitable for Date.parse()
 662     """
 663     from datetime import datetime
 664     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))