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 from slughifi import slughifi
  38
  39
  40 staff_required = user_passes_test(lambda user: user.is_staff)
  41
  42
  43 class LazyEncoder(simplejson.JSONEncoder):
  44     def default(self, obj):
  45         if isinstance(obj, Promise):
  46             return force_unicode(obj)
  47         return obj
  48
  49 # shortcut for JSON reponses
  50 class JSONResponse(HttpResponse):
  51     def __init__(self, data={}, callback=None, **kwargs):
  52         # get rid of mimetype
  53         kwargs.pop('mimetype', None)
  54         data = simplejson.dumps(data)
  55         if callback:
  56             data = callback + "(" + data + ");"
  57         super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
  58
  59
  60 def main_page(request):
  61     if request.user.is_authenticated():
  62         shelves = models.Tag.objects.filter(category='set', user=request.user)
  63         new_set_form = forms.NewSetForm()
  64
  65     tags = models.Tag.objects.exclude(category__in=('set', 'book'))
  66     for tag in tags:
  67         tag.count = tag.get_count()
  68     categories = split_tags(tags)
  69     fragment_tags = categories.get('theme', [])
  70
  71     form = forms.SearchForm()
  72     return render_to_response('catalogue/main_page.html', locals(),
  73         context_instance=RequestContext(request))
  74
  75
  76 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  77     """ generates a listing of all books, optionally filtered with a test function """
  78
  79     form = forms.SearchForm()
  80
  81     books_by_parent = {}
  82     books = models.Book.objects.all().order_by('parent_number', 'title').only('title', 'parent', 'slug')
  83     if filter:
  84         books = books.filter(filter)
  85         book_ids = set((book.pk for book in books))
  86         for book in books:
  87             parent = book.parent_id
  88             if parent not in book_ids:
  89                 parent = None
  90             books_by_parent.setdefault(parent, []).append(book)
  91     else:
  92         for book in books:
  93             books_by_parent.setdefault(book.parent_id, []).append(book)
  94
  95     orphans = []
  96     books_by_author = SortedDict()
  97     books_nav = SortedDict()
  98     for tag in models.Tag.objects.filter(category='author'):
  99         books_by_author[tag] = []
 100
 101     for book in books_by_parent.get(None,()):
 102         authors = list(book.tags.filter(category='author'))
 103         if authors:
 104             for author in authors:
 105                 books_by_author[author].append(book)
 106         else:
 107             orphans.append(book)
 108
 109     for tag in books_by_author:
 110         if books_by_author[tag]:
 111             books_nav.setdefault(tag.sort_key[0], []).append(tag)
 112
 113     return render_to_response(template_name, locals(),
 114         context_instance=RequestContext(request))
 115
 116
 117 def audiobook_list(request):
 118     return book_list(request, ~Q(mp3_file='') | ~Q(ogg_file=''),
 119                      template_name='catalogue/audiobook_list.html')
 120
 121
 122 def daisy_list(request):
 123     return book_list(request, ~Q(daisy_file=''),
 124                      template_name='catalogue/daisy_list.html')
 125
 126
 127 def differentiate_tags(request, tags, ambiguous_slugs):
 128     beginning = '/'.join(tag.url_chunk for tag in tags)
 129     unparsed = '/'.join(ambiguous_slugs[1:])
 130     options = []
 131     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 132         options.append({
 133             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 134             'tags': [tag]
 135         })
 136     return render_to_response('catalogue/differentiate_tags.html',
 137                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 138                 context_instance=RequestContext(request))
 139
 140
 141 def tagged_object_list(request, tags=''):
 142     try:
 143         tags = models.Tag.get_tag_list(tags)
 144     except models.Tag.DoesNotExist:
 145         raise Http404
 146     except models.Tag.MultipleObjectsReturned, e:
 147         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 148
 149     try:
 150         if len(tags) > settings.MAX_TAG_LIST:
 151             raise Http404
 152     except AttributeError:
 153         pass
 154
 155     if len([tag for tag in tags if tag.category == 'book']):
 156         raise Http404
 157
 158     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 159     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 160     only_shelf = shelf_is_set and len(tags) == 1
 161     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 162
 163     objects = only_author = pd_counter = None
 164     categories = {}
 165
 166     if theme_is_set:
 167         shelf_tags = [tag for tag in tags if tag.category == 'set']
 168         fragment_tags = [tag for tag in tags if tag.category != 'set']
 169         fragments = models.Fragment.tagged.with_all(fragment_tags)
 170
 171         if shelf_tags:
 172             books = models.Book.tagged.with_all(shelf_tags).order_by()
 173             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 174             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 175
 176         # newtagging goes crazy if we just try:
 177         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 178         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 179         fragment_keys = [fragment.pk for fragment in fragments]
 180         if fragment_keys:
 181             related_tags = models.Fragment.tags.usage(counts=True,
 182                                 filters={'pk__in': fragment_keys},
 183                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 184             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 185             categories = split_tags(related_tags)
 186
 187             objects = fragments
 188     else:
 189         # get relevant books and their tags
 190         objects = models.Book.tagged.with_all(tags)
 191         if not shelf_is_set:
 192             # eliminate descendants
 193             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in objects])
 194             descendants_keys = [book.pk for book in models.Book.tagged.with_any(l_tags)]
 195             if descendants_keys:
 196                 objects = objects.exclude(pk__in=descendants_keys)
 197
 198         # get related tags from `tag_counter` and `theme_counter`
 199         related_counts = {}
 200         tags_pks = [tag.pk for tag in tags]
 201         for book in objects:
 202             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 203                 if tag_pk in tags_pks:
 204                     continue
 205                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 206         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 207         related_tags = [tag for tag in related_tags if tag not in tags]
 208         for tag in related_tags:
 209             tag.count = related_counts[tag.pk]
 210
 211         categories = split_tags(related_tags)
 212         del related_tags
 213
 214     if not objects:
 215         only_author = len(tags) == 1 and tags[0].category == 'author'
 216         pd_counter = only_author and tags[0].goes_to_pd()
 217         objects = models.Book.objects.none()
 218
 219     return object_list(
 220         request,
 221         objects,
 222         template_name='catalogue/tagged_object_list.html',
 223         extra_context={
 224             'categories': categories,
 225             'only_shelf': only_shelf,
 226             'only_author': only_author,
 227             'pd_counter': pd_counter,
 228             'only_my_shelf': only_my_shelf,
 229             'formats_form': forms.DownloadFormatsForm(),
 230
 231             'tags': tags,
 232         }
 233     )
 234
 235
 236 def book_fragments(request, book_slug, theme_slug):
 237     book = get_object_or_404(models.Book, slug=book_slug)
 238     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 239     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 240     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 241
 242     form = forms.SearchForm()
 243     return render_to_response('catalogue/book_fragments.html', locals(),
 244         context_instance=RequestContext(request))
 245
 246
 247 def book_detail(request, slug):
 248     try:
 249         book = models.Book.objects.get(slug=slug)
 250     except models.Book.DoesNotExist:
 251         return book_stub_detail(request, slug)
 252
 253     book_tag = book.book_tag()
 254     tags = list(book.tags.filter(~Q(category='set')))
 255     categories = split_tags(tags)
 256     book_children = book.children.all().order_by('parent_number')
 257
 258     _book = book
 259     parents = []
 260     while _book.parent:
 261         parents.append(_book.parent)
 262         _book = _book.parent
 263     parents = reversed(parents)
 264
 265     theme_counter = book.theme_counter
 266     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 267     for tag in book_themes:
 268         tag.count = theme_counter[tag.pk]
 269
 270     extra_info = book.get_extra_info_value()
 271
 272     form = forms.SearchForm()
 273     return render_to_response('catalogue/book_detail.html', locals(),
 274         context_instance=RequestContext(request))
 275
 276
 277 def book_stub_detail(request, slug):
 278     book = get_object_or_404(models.BookStub, slug=slug)
 279     pd_counter = book.pd
 280     form = forms.SearchForm()
 281
 282     return render_to_response('catalogue/book_stub_detail.html', locals(),
 283         context_instance=RequestContext(request))
 284
 285
 286 def book_text(request, slug):
 287     book = get_object_or_404(models.Book, slug=slug)
 288     if not book.has_html_file():
 289         raise Http404
 290     book_themes = {}
 291     for fragment in book.fragments.all():
 292         for theme in fragment.tags.filter(category='theme'):
 293             book_themes.setdefault(theme, []).append(fragment)
 294
 295     book_themes = book_themes.items()
 296     book_themes.sort(key=lambda s: s[0].sort_key)
 297     return render_to_response('catalogue/book_text.html', locals(),
 298         context_instance=RequestContext(request))
 299
 300
 301 # ==========
 302 # = Search =
 303 # ==========
 304
 305 def _no_diacritics_regexp(query):
 306     """ returns a regexp for searching for a query without diacritics
 307
 308     should be locale-aware """
 309     names = {
 310         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',
 311         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'
 312         }
 313     def repl(m):
 314         l = m.group()
 315         return u"(%s)" % '|'.join(names[l])
 316     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 317
 318 def unicode_re_escape(query):
 319     """ Unicode-friendly version of re.escape """
 320     return re.sub('(?u)(\W)', r'\\\1', query)
 321
 322 def _word_starts_with(name, prefix):
 323     """returns a Q object getting models having `name` contain a word
 324     starting with `prefix`
 325
 326     We define word characters as alphanumeric and underscore, like in JS.
 327
 328     Works for MySQL, PostgreSQL, Oracle.
 329     For SQLite, _sqlite* version is substituted for this.
 330     """
 331     kwargs = {}
 332
 333     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 334     # can't use [[:<:]] (word start),
 335     # but we want both `xy` and `(xy` to catch `(xyz)`
 336     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 337
 338     return Q(**kwargs)
 339
 340
 341 def _sqlite_word_starts_with(name, prefix):
 342     """ version of _word_starts_with for SQLite
 343
 344     SQLite in Django uses Python re module
 345     """
 346     kwargs = {}
 347     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 348     kwargs['%s__iregex' % name] = ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 349     return Q(**kwargs)
 350
 351
 352 if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 353     _word_starts_with = _sqlite_word_starts_with
 354
 355
 356 def _tags_starting_with(prefix, user=None):
 357     prefix = prefix.lower()
 358     book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
 359     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 360     book_stubs = filter(lambda x: x not in books, book_stubs)
 361     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 362     if user and user.is_authenticated():
 363         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 364     else:
 365         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 366     return list(books) + list(tags) + list(book_stubs)
 367
 368
 369 def _get_result_link(match, tag_list):
 370     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 371         return match.get_absolute_url()
 372     else:
 373         return reverse('catalogue.views.tagged_object_list',
 374             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 375         )
 376
 377 def _get_result_type(match):
 378     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 379         type = 'book'
 380     else:
 381         type = match.category
 382     return type
 383
 384
 385 def books_starting_with(prefix):
 386     prefix = prefix.lower()
 387     return models.Book.objects.filter(_word_starts_with('title', prefix))
 388
 389
 390 def find_best_matches(query, user=None):
 391     """ Finds a Book, Tag or Bookstub best matching a query.
 392
 393     Returns a with:
 394       - zero elements when nothing is found,
 395       - one element when a best result is found,
 396       - more then one element on multiple exact matches
 397
 398     Raises a ValueError on too short a query.
 399     """
 400
 401     query = query.lower()
 402     if len(query) < 2:
 403         raise ValueError("query must have at least two characters")
 404
 405     result = tuple(_tags_starting_with(query, user))
 406     exact_matches = tuple(res for res in result if res.name.lower() == query)
 407     if exact_matches:
 408         return exact_matches
 409     else:
 410         return result[:1]
 411
 412
 413 def search(request):
 414     tags = request.GET.get('tags', '')
 415     prefix = request.GET.get('q', '')
 416
 417     try:
 418         tag_list = models.Tag.get_tag_list(tags)
 419     except:
 420         tag_list = []
 421
 422     try:
 423         result = find_best_matches(prefix, request.user)
 424     except ValueError:
 425         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 426             context_instance=RequestContext(request))
 427
 428     if len(result) == 1:
 429         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 430     elif len(result) > 1:
 431         return render_to_response('catalogue/search_multiple_hits.html',
 432             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 433             context_instance=RequestContext(request))
 434     else:
 435         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 436             context_instance=RequestContext(request))
 437
 438
 439 def tags_starting_with(request):
 440     prefix = request.GET.get('q', '')
 441     # Prefix must have at least 2 characters
 442     if len(prefix) < 2:
 443         return HttpResponse('')
 444     tags_list = []
 445     result = ""
 446     for tag in _tags_starting_with(prefix, request.user):
 447         if not tag.name in tags_list:
 448             result += "\n" + tag.name
 449             tags_list.append(tag.name)
 450     return HttpResponse(result)
 451
 452 def json_tags_starting_with(request, callback=None):
 453     # Callback for JSONP
 454     prefix = request.GET.get('q', '')
 455     callback = request.GET.get('callback', '')
 456     # Prefix must have at least 2 characters
 457     if len(prefix) < 2:
 458         return HttpResponse('')
 459     tags_list = []
 460     result = ""
 461     for tag in _tags_starting_with(prefix, request.user):
 462         if not tag.name in tags_list:
 463             result += "\n" + tag.name
 464             tags_list.append(tag.name)
 465     dict_result = {"matches": tags_list}
 466     return JSONResponse(dict_result, callback)
 467
 468 # ====================
 469 # = Shelf management =
 470 # ====================
 471 @login_required
 472 @cache.never_cache
 473 def user_shelves(request):
 474     shelves = models.Tag.objects.filter(category='set', user=request.user)
 475     new_set_form = forms.NewSetForm()
 476     return render_to_response('catalogue/user_shelves.html', locals(),
 477             context_instance=RequestContext(request))
 478
 479 @cache.never_cache
 480 def book_sets(request, slug):
 481     if not request.user.is_authenticated():
 482         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 483
 484     book = get_object_or_404(models.Book, slug=slug)
 485     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 486     book_sets = book.tags.filter(category='set', user=request.user)
 487
 488     if request.method == 'POST':
 489         form = forms.ObjectSetsForm(book, request.user, request.POST)
 490         if form.is_valid():
 491             old_shelves = list(book.tags.filter(category='set'))
 492             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 493
 494             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 495                 shelf.book_count = None
 496                 shelf.save()
 497
 498             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 499                 shelf.book_count = None
 500                 shelf.save()
 501
 502             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 503             if request.is_ajax():
 504                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 505             else:
 506                 return HttpResponseRedirect('/')
 507     else:
 508         form = forms.ObjectSetsForm(book, request.user)
 509         new_set_form = forms.NewSetForm()
 510
 511     return render_to_response('catalogue/book_sets.html', locals(),
 512         context_instance=RequestContext(request))
 513
 514
 515 @login_required
 516 @require_POST
 517 @cache.never_cache
 518 def remove_from_shelf(request, shelf, book):
 519     book = get_object_or_404(models.Book, slug=book)
 520     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 521
 522     if shelf in book.tags:
 523         models.Tag.objects.remove_tag(book, shelf)
 524
 525         shelf.book_count = None
 526         shelf.save()
 527
 528         return HttpResponse(_('Book was successfully removed from the shelf'))
 529     else:
 530         return HttpResponse(_('This book is not on the shelf'))
 531
 532
 533 def collect_books(books):
 534     """
 535     Returns all real books in collection.
 536     """
 537     result = []
 538     for book in books:
 539         if len(book.children.all()) == 0:
 540             result.append(book)
 541         else:
 542             result += collect_books(book.children.all())
 543     return result
 544
 545
 546 @cache.never_cache
 547 def download_shelf(request, slug):
 548     """"
 549     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 550     without loading the whole file into memory. A similar approach can
 551     be used for large dynamic PDF files.
 552     """
 553     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 554
 555     formats = []
 556     form = forms.DownloadFormatsForm(request.GET)
 557     if form.is_valid():
 558         formats = form.cleaned_data['formats']
 559     if len(formats) == 0:
 560         formats = ['pdf', 'epub', 'odt', 'txt', 'mp3', 'ogg', 'daisy']
 561
 562     # Create a ZIP archive
 563     temp = tempfile.TemporaryFile()
 564     archive = zipfile.ZipFile(temp, 'w')
 565
 566     already = set()
 567     for book in collect_books(models.Book.tagged.with_all(shelf)):
 568         if 'pdf' in formats and book.pdf_file:
 569             filename = book.pdf_file.path
 570             archive.write(filename, str('%s.pdf' % book.slug))
 571         if book.root_ancestor not in already and 'epub' in formats and book.root_ancestor.epub_file:
 572             filename = book.root_ancestor.epub_file.path
 573             archive.write(filename, str('%s.epub' % book.root_ancestor.slug))
 574             already.add(book.root_ancestor)
 575         if 'odt' in formats and book.odt_file:
 576             filename = book.odt_file.path
 577             archive.write(filename, str('%s.odt' % book.slug))
 578         if 'txt' in formats and book.txt_file:
 579             filename = book.txt_file.path
 580             archive.write(filename, str('%s.txt' % book.slug))
 581         if 'mp3' in formats and book.mp3_file:
 582             filename = book.mp3_file.path
 583             archive.write(filename, str('%s.mp3' % book.slug))
 584         if 'ogg' in formats and book.ogg_file:
 585             filename = book.ogg_file.path
 586             archive.write(filename, str('%s.ogg' % book.slug))
 587         if 'daisy' in formats and book.daisy_file:
 588             filename = book.daisy_file.path
 589             archive.write(filename, str('%s.daisy.zip' % book.slug))
 590     archive.close()
 591
 592     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 593     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 594     response['Content-Length'] = temp.tell()
 595
 596     temp.seek(0)
 597     response.write(temp.read())
 598     return response
 599
 600
 601 @cache.never_cache
 602 def shelf_book_formats(request, shelf):
 603     """"
 604     Returns a list of formats of books in shelf.
 605     """
 606     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 607
 608     formats = {'pdf': False, 'epub': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False, 'daisy': False}
 609
 610     for book in collect_books(models.Book.tagged.with_all(shelf)):
 611         if book.pdf_file:
 612             formats['pdf'] = True
 613         if book.root_ancestor.epub_file:
 614             formats['epub'] = True
 615         if book.odt_file:
 616             formats['odt'] = True
 617         if book.txt_file:
 618             formats['txt'] = True
 619         if book.mp3_file:
 620             formats['mp3'] = True
 621         if book.ogg_file:
 622             formats['ogg'] = True
 623         if book.daisy_file:
 624             formats['daisy'] = True
 625
 626     return HttpResponse(LazyEncoder().encode(formats))
 627
 628
 629 @login_required
 630 @require_POST
 631 @cache.never_cache
 632 def new_set(request):
 633     new_set_form = forms.NewSetForm(request.POST)
 634     if new_set_form.is_valid():
 635         new_set = new_set_form.save(request.user)
 636
 637         if request.is_ajax():
 638             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 639         else:
 640             return HttpResponseRedirect('/')
 641
 642     return HttpResponseRedirect('/')
 643
 644
 645 @login_required
 646 @require_POST
 647 @cache.never_cache
 648 def delete_shelf(request, slug):
 649     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 650     user_set.delete()
 651
 652     if request.is_ajax():
 653         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 654     else:
 655         return HttpResponseRedirect('/')
 656
 657
 658 # ==================
 659 # = Authentication =
 660 # ==================
 661 @require_POST
 662 @cache.never_cache
 663 def login(request):
 664     form = AuthenticationForm(data=request.POST, prefix='login')
 665     if form.is_valid():
 666         auth.login(request, form.get_user())
 667         response_data = {'success': True, 'errors': {}}
 668     else:
 669         response_data = {'success': False, 'errors': form.errors}
 670     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 671
 672
 673 @require_POST
 674 @cache.never_cache
 675 def register(request):
 676     registration_form = UserCreationForm(request.POST, prefix='registration')
 677     if registration_form.is_valid():
 678         user = registration_form.save()
 679         user = auth.authenticate(
 680             username=registration_form.cleaned_data['username'],
 681             password=registration_form.cleaned_data['password1']
 682         )
 683         auth.login(request, user)
 684         response_data = {'success': True, 'errors': {}}
 685     else:
 686         response_data = {'success': False, 'errors': registration_form.errors}
 687     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 688
 689
 690 @cache.never_cache
 691 def logout_then_redirect(request):
 692     auth.logout(request)
 693     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 694
 695
 696
 697 # =========
 698 # = Admin =
 699 # =========
 700 @login_required
 701 @staff_required
 702 def import_book(request):
 703     """docstring for import_book"""
 704     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 705     if book_import_form.is_valid():
 706         try:
 707             book_import_form.save()
 708         except:
 709             info = sys.exc_info()
 710             exception = pprint.pformat(info[1])
 711             tb = '\n'.join(traceback.format_tb(info[2]))
 712             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 713         return HttpResponse(_("Book imported successfully"))
 714     else:
 715         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 716
 717
 718
 719 def clock(request):
 720     """ Provides server time for jquery.countdown,
 721     in a format suitable for Date.parse()
 722     """
 723     from datetime import datetime
 724     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))