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 tarfile
   8 import sys
   9 import pprint
  10 import traceback
  11 import re
  12 import itertools
  13 from datetime import datetime
  14
  15 from django.conf import settings
  16 from django.template import RequestContext
  17 from django.shortcuts import render_to_response, get_object_or_404
  18 from django.http import HttpResponse, HttpResponseRedirect, Http404, HttpResponsePermanentRedirect
  19 from django.core.urlresolvers import reverse
  20 from django.db.models import Q
  21 from django.contrib.auth.decorators import login_required, user_passes_test
  22 from django.utils.datastructures import SortedDict
  23 from django.views.decorators.http import require_POST
  24 from django.contrib import auth
  25 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  26 from django.utils import simplejson
  27 from django.utils.functional import Promise
  28 from django.utils.encoding import force_unicode
  29 from django.utils.http import urlquote_plus
  30 from django.views.decorators import cache
  31 from django.utils.translation import ugettext as _
  32 from django.views.generic.list_detail import object_list
  33
  34 from catalogue import models
  35 from catalogue import forms
  36 from catalogue.utils import split_tags
  37 from newtagging import views as newtagging_views
  38 from pdcounter import models as pdcounter_models
  39 from pdcounter import views as pdcounter_views
  40 from slughifi import slughifi
  41
  42
  43 staff_required = user_passes_test(lambda user: user.is_staff)
  44
  45
  46 class LazyEncoder(simplejson.JSONEncoder):
  47     def default(self, obj):
  48         if isinstance(obj, Promise):
  49             return force_unicode(obj)
  50         return obj
  51
  52 # shortcut for JSON reponses
  53 class JSONResponse(HttpResponse):
  54     def __init__(self, data={}, callback=None, **kwargs):
  55         # get rid of mimetype
  56         kwargs.pop('mimetype', None)
  57         data = simplejson.dumps(data)
  58         if callback:
  59             data = callback + "(" + data + ");"
  60         super(JSONResponse, self).__init__(data, mimetype="application/json", **kwargs)
  61
  62
  63 def main_page(request):
  64     if request.user.is_authenticated():
  65         shelves = models.Tag.objects.filter(category='set', user=request.user)
  66         new_set_form = forms.NewSetForm()
  67
  68     tags = models.Tag.objects.exclude(category__in=('set', 'book'))
  69     for tag in tags:
  70         tag.count = tag.get_count()
  71     categories = split_tags(tags)
  72     fragment_tags = categories.get('theme', [])
  73
  74     form = forms.SearchForm()
  75     return render_to_response('catalogue/main_page.html', locals(),
  76         context_instance=RequestContext(request))
  77
  78
  79 def book_list(request, filter=None, template_name='catalogue/book_list.html'):
  80     """ generates a listing of all books, optionally filtered with a test function """
  81
  82     form = forms.SearchForm()
  83
  84     books_by_parent = {}
  85     books = models.Book.objects.all().order_by('parent_number', 'title').only('title', 'parent', 'slug')
  86     if filter:
  87         books = books.filter(filter).distinct()
  88         book_ids = set((book.pk for book in books))
  89         for book in books:
  90             parent = book.parent_id
  91             if parent not in book_ids:
  92                 parent = None
  93             books_by_parent.setdefault(parent, []).append(book)
  94     else:
  95         for book in books:
  96             books_by_parent.setdefault(book.parent_id, []).append(book)
  97
  98     orphans = []
  99     books_by_author = SortedDict()
 100     books_nav = SortedDict()
 101     for tag in models.Tag.objects.filter(category='author'):
 102         books_by_author[tag] = []
 103
 104     for book in books_by_parent.get(None,()):
 105         authors = list(book.tags.filter(category='author'))
 106         if authors:
 107             for author in authors:
 108                 books_by_author[author].append(book)
 109         else:
 110             orphans.append(book)
 111
 112     for tag in books_by_author:
 113         if books_by_author[tag]:
 114             books_nav.setdefault(tag.sort_key[0], []).append(tag)
 115
 116     return render_to_response(template_name, locals(),
 117         context_instance=RequestContext(request))
 118
 119
 120 def audiobook_list(request):
 121     return book_list(request, Q(medias__type='mp3') | Q(medias__type='ogg'),
 122                      template_name='catalogue/audiobook_list.html')
 123
 124
 125 def daisy_list(request):
 126     return book_list(request, Q(medias__type='daisy'),
 127                      template_name='catalogue/daisy_list.html')
 128
 129
 130 def differentiate_tags(request, tags, ambiguous_slugs):
 131     beginning = '/'.join(tag.url_chunk for tag in tags)
 132     unparsed = '/'.join(ambiguous_slugs[1:])
 133     options = []
 134     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
 135         options.append({
 136             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
 137             'tags': [tag]
 138         })
 139     return render_to_response('catalogue/differentiate_tags.html',
 140                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
 141                 context_instance=RequestContext(request))
 142
 143
 144 def tagged_object_list(request, tags=''):
 145     try:
 146         tags = models.Tag.get_tag_list(tags)
 147     except models.Tag.DoesNotExist:
 148         chunks = tags.split('/')
 149         if len(chunks) == 2 and chunks[0] == 'autor':
 150             return pdcounter_views.author_detail(request, chunks[1])
 151         else:
 152             raise Http404
 153     except models.Tag.MultipleObjectsReturned, e:
 154         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
 155     except models.Tag.UrlDeprecationWarning, e:
 156         return HttpResponsePermanentRedirect(reverse('tagged_object_list', args=['/'.join(tag.url_chunk for tag in e.tags)]))
 157
 158     try:
 159         if len(tags) > settings.MAX_TAG_LIST:
 160             raise Http404
 161     except AttributeError:
 162         pass
 163
 164     if len([tag for tag in tags if tag.category == 'book']):
 165         raise Http404
 166
 167     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 168     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 169     only_shelf = shelf_is_set and len(tags) == 1
 170     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 171
 172     objects = only_author = None
 173     categories = {}
 174
 175     if theme_is_set:
 176         shelf_tags = [tag for tag in tags if tag.category == 'set']
 177         fragment_tags = [tag for tag in tags if tag.category != 'set']
 178         fragments = models.Fragment.tagged.with_all(fragment_tags)
 179
 180         if shelf_tags:
 181             books = models.Book.tagged.with_all(shelf_tags).order_by()
 182             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in books])
 183             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 184
 185         # newtagging goes crazy if we just try:
 186         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 187         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 188         fragment_keys = [fragment.pk for fragment in fragments]
 189         if fragment_keys:
 190             related_tags = models.Fragment.tags.usage(counts=True,
 191                                 filters={'pk__in': fragment_keys},
 192                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 193             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 194             categories = split_tags(related_tags)
 195
 196             objects = fragments
 197     else:
 198         # get relevant books and their tags
 199         objects = models.Book.tagged.with_all(tags)
 200         if not shelf_is_set:
 201             # eliminate descendants
 202             l_tags = models.Tag.objects.filter(category='book', slug__in=[book.book_tag_slug() for book in objects])
 203             descendants_keys = [book.pk for book in models.Book.tagged.with_any(l_tags)]
 204             if descendants_keys:
 205                 objects = objects.exclude(pk__in=descendants_keys)
 206
 207         # get related tags from `tag_counter` and `theme_counter`
 208         related_counts = {}
 209         tags_pks = [tag.pk for tag in tags]
 210         for book in objects:
 211             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 212                 if tag_pk in tags_pks:
 213                     continue
 214                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 215         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 216         related_tags = [tag for tag in related_tags if tag not in tags]
 217         for tag in related_tags:
 218             tag.count = related_counts[tag.pk]
 219
 220         categories = split_tags(related_tags)
 221         del related_tags
 222
 223     if not objects:
 224         only_author = len(tags) == 1 and tags[0].category == 'author'
 225         objects = models.Book.objects.none()
 226
 227     return object_list(
 228         request,
 229         objects,
 230         template_name='catalogue/tagged_object_list.html',
 231         extra_context={
 232             'categories': categories,
 233             'only_shelf': only_shelf,
 234             'only_author': only_author,
 235             'only_my_shelf': only_my_shelf,
 236             'formats_form': forms.DownloadFormatsForm(),
 237
 238             'tags': tags,
 239         }
 240     )
 241
 242
 243 def book_fragments(request, book_slug, theme_slug):
 244     book = get_object_or_404(models.Book, slug=book_slug)
 245     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 246     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 247     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 248
 249     form = forms.SearchForm()
 250     return render_to_response('catalogue/book_fragments.html', locals(),
 251         context_instance=RequestContext(request))
 252
 253
 254 def book_detail(request, slug):
 255     try:
 256         book = models.Book.objects.get(slug=slug)
 257     except models.Book.DoesNotExist:
 258         return pdcounter_views.book_stub_detail(request, slug)
 259
 260     book_tag = book.book_tag()
 261     tags = list(book.tags.filter(~Q(category='set')))
 262     categories = split_tags(tags)
 263     book_children = book.children.all().order_by('parent_number', 'title')
 264
 265     _book = book
 266     parents = []
 267     while _book.parent:
 268         parents.append(_book.parent)
 269         _book = _book.parent
 270     parents = reversed(parents)
 271
 272     theme_counter = book.theme_counter
 273     book_themes = models.Tag.objects.filter(pk__in=theme_counter.keys())
 274     for tag in book_themes:
 275         tag.count = theme_counter[tag.pk]
 276
 277     extra_info = book.get_extra_info_value()
 278
 279     form = forms.SearchForm()
 280     return render_to_response('catalogue/book_detail.html', locals(),
 281         context_instance=RequestContext(request))
 282
 283
 284 def book_text(request, slug):
 285     book = get_object_or_404(models.Book, slug=slug)
 286     if not book.has_html_file():
 287         raise Http404
 288     book_themes = {}
 289     for fragment in book.fragments.all():
 290         for theme in fragment.tags.filter(category='theme'):
 291             book_themes.setdefault(theme, []).append(fragment)
 292
 293     book_themes = book_themes.items()
 294     book_themes.sort(key=lambda s: s[0].sort_key)
 295     return render_to_response('catalogue/book_text.html', locals(),
 296         context_instance=RequestContext(request))
 297
 298
 299 # ==========
 300 # = Search =
 301 # ==========
 302
 303 def _no_diacritics_regexp(query):
 304     """ returns a regexp for searching for a query without diacritics
 305
 306     should be locale-aware """
 307     names = {
 308         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',
 309         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'
 310         }
 311     def repl(m):
 312         l = m.group()
 313         return u"(%s)" % '|'.join(names[l])
 314     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 315
 316 def unicode_re_escape(query):
 317     """ Unicode-friendly version of re.escape """
 318     return re.sub('(?u)(\W)', r'\\\1', query)
 319
 320 def _word_starts_with(name, prefix):
 321     """returns a Q object getting models having `name` contain a word
 322     starting with `prefix`
 323
 324     We define word characters as alphanumeric and underscore, like in JS.
 325
 326     Works for MySQL, PostgreSQL, Oracle.
 327     For SQLite, _sqlite* version is substituted for this.
 328     """
 329     kwargs = {}
 330
 331     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 332     # can't use [[:<:]] (word start),
 333     # but we want both `xy` and `(xy` to catch `(xyz)`
 334     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 335
 336     return Q(**kwargs)
 337
 338
 339 def _word_starts_with_regexp(prefix):
 340     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 341     return ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 342
 343
 344 def _sqlite_word_starts_with(name, prefix):
 345     """ version of _word_starts_with for SQLite
 346
 347     SQLite in Django uses Python re module
 348     """
 349     kwargs = {}
 350     kwargs['%s__iregex' % name] = _word_starts_with_regexp(prefix)
 351     return Q(**kwargs)
 352
 353
 354 if hasattr(settings, 'DATABASES'):
 355     if settings.DATABASES['default']['ENGINE'] == 'django.db.backends.sqlite3':
 356         _word_starts_with = _sqlite_word_starts_with
 357 elif settings.DATABASE_ENGINE == 'sqlite3':
 358     _word_starts_with = _sqlite_word_starts_with
 359
 360
 361 class App():
 362     def __init__(self, name, view):
 363         self.name = name
 364         self._view = view
 365         self.lower = name.lower()
 366         self.category = 'application'
 367     def view(self):
 368         return reverse(*self._view)
 369
 370 _apps = (
 371     App(u'Leśmianator', (u'lesmianator', )),
 372     )
 373
 374
 375 def _tags_starting_with(prefix, user=None):
 376     prefix = prefix.lower()
 377     # PD counter
 378     book_stubs = pdcounter_models.BookStub.objects.filter(_word_starts_with('title', prefix))
 379     authors = pdcounter_models.Author.objects.filter(_word_starts_with('name', prefix))
 380
 381     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 382     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 383     if user and user.is_authenticated():
 384         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 385     else:
 386         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 387
 388     prefix_regexp = re.compile(_word_starts_with_regexp(prefix))
 389     return list(books) + list(tags) + [app for app in _apps if prefix_regexp.search(app.lower)] + list(book_stubs) + list(authors)
 390
 391
 392 def _get_result_link(match, tag_list):
 393     if isinstance(match, models.Tag):
 394         return reverse('catalogue.views.tagged_object_list',
 395             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 396         )
 397     elif isinstance(match, App):
 398         return match.view()
 399     else:
 400         return match.get_absolute_url()
 401
 402
 403 def _get_result_type(match):
 404     if isinstance(match, models.Book) or isinstance(match, pdcounter_models.BookStub):
 405         type = 'book'
 406     else:
 407         type = match.category
 408     return type
 409
 410
 411 def books_starting_with(prefix):
 412     prefix = prefix.lower()
 413     return models.Book.objects.filter(_word_starts_with('title', prefix))
 414
 415
 416 def find_best_matches(query, user=None):
 417     """ Finds a Book, Tag, BookStub or Author best matching a query.
 418
 419     Returns a with:
 420       - zero elements when nothing is found,
 421       - one element when a best result is found,
 422       - more then one element on multiple exact matches
 423
 424     Raises a ValueError on too short a query.
 425     """
 426
 427     query = query.lower()
 428     if len(query) < 2:
 429         raise ValueError("query must have at least two characters")
 430
 431     result = tuple(_tags_starting_with(query, user))
 432     # remove pdcounter stuff
 433     book_titles = set(match.pretty_title().lower() for match in result
 434                       if isinstance(match, models.Book))
 435     authors = set(match.name.lower() for match in result
 436                   if isinstance(match, models.Tag) and match.category=='author')
 437     result = tuple(res for res in result if not (
 438                  (isinstance(res, pdcounter_models.BookStub) and res.pretty_title().lower() in book_titles)
 439                  or (isinstance(res, pdcounter_models.Author) and res.name.lower() in authors)
 440              ))
 441
 442     exact_matches = tuple(res for res in result if res.name.lower() == query)
 443     if exact_matches:
 444         return exact_matches
 445     else:
 446         return tuple(result)[:1]
 447
 448
 449 def search(request):
 450     tags = request.GET.get('tags', '')
 451     prefix = request.GET.get('q', '')
 452
 453     try:
 454         tag_list = models.Tag.get_tag_list(tags)
 455     except:
 456         tag_list = []
 457
 458     try:
 459         result = find_best_matches(prefix, request.user)
 460     except ValueError:
 461         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 462             context_instance=RequestContext(request))
 463
 464     if len(result) == 1:
 465         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 466     elif len(result) > 1:
 467         return render_to_response('catalogue/search_multiple_hits.html',
 468             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 469             context_instance=RequestContext(request))
 470     else:
 471         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 472             context_instance=RequestContext(request))
 473
 474
 475 def tags_starting_with(request):
 476     prefix = request.GET.get('q', '')
 477     # Prefix must have at least 2 characters
 478     if len(prefix) < 2:
 479         return HttpResponse('')
 480     tags_list = []
 481     result = ""
 482     for tag in _tags_starting_with(prefix, request.user):
 483         if not tag.name in tags_list:
 484             result += "\n" + tag.name
 485             tags_list.append(tag.name)
 486     return HttpResponse(result)
 487
 488 def json_tags_starting_with(request, callback=None):
 489     # Callback for JSONP
 490     prefix = request.GET.get('q', '')
 491     callback = request.GET.get('callback', '')
 492     # Prefix must have at least 2 characters
 493     if len(prefix) < 2:
 494         return HttpResponse('')
 495     tags_list = []
 496     for tag in _tags_starting_with(prefix, request.user):
 497         if not tag.name in tags_list:
 498             tags_list.append(tag.name)
 499     if request.GET.get('mozhint', ''):
 500         result = [prefix, tags_list]
 501     else:
 502         result = {"matches": tags_list}
 503     return JSONResponse(result, callback)
 504
 505 # ====================
 506 # = Shelf management =
 507 # ====================
 508 @login_required
 509 @cache.never_cache
 510 def user_shelves(request):
 511     shelves = models.Tag.objects.filter(category='set', user=request.user)
 512     new_set_form = forms.NewSetForm()
 513     return render_to_response('catalogue/user_shelves.html', locals(),
 514             context_instance=RequestContext(request))
 515
 516 @cache.never_cache
 517 def book_sets(request, slug):
 518     if not request.user.is_authenticated():
 519         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 520
 521     book = get_object_or_404(models.Book, slug=slug)
 522     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 523     book_sets = book.tags.filter(category='set', user=request.user)
 524
 525     if request.method == 'POST':
 526         form = forms.ObjectSetsForm(book, request.user, request.POST)
 527         if form.is_valid():
 528             old_shelves = list(book.tags.filter(category='set'))
 529             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 530
 531             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 532                 shelf.book_count = None
 533                 shelf.save()
 534
 535             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 536                 shelf.book_count = None
 537                 shelf.save()
 538
 539             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 540             if request.is_ajax():
 541                 return JSONResponse('{"msg":"'+_("<p>Shelves were sucessfully saved.</p>")+'", "after":"close"}')
 542             else:
 543                 return HttpResponseRedirect('/')
 544     else:
 545         form = forms.ObjectSetsForm(book, request.user)
 546         new_set_form = forms.NewSetForm()
 547
 548     return render_to_response('catalogue/book_sets.html', locals(),
 549         context_instance=RequestContext(request))
 550
 551
 552 @login_required
 553 @require_POST
 554 @cache.never_cache
 555 def remove_from_shelf(request, shelf, book):
 556     book = get_object_or_404(models.Book, slug=book)
 557     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 558
 559     if shelf in book.tags:
 560         models.Tag.objects.remove_tag(book, shelf)
 561
 562         shelf.book_count = None
 563         shelf.save()
 564
 565         return HttpResponse(_('Book was successfully removed from the shelf'))
 566     else:
 567         return HttpResponse(_('This book is not on the shelf'))
 568
 569
 570 def collect_books(books):
 571     """
 572     Returns all real books in collection.
 573     """
 574     result = []
 575     for book in books:
 576         if len(book.children.all()) == 0:
 577             result.append(book)
 578         else:
 579             result += collect_books(book.children.all())
 580     return result
 581
 582
 583 @cache.never_cache
 584 def download_shelf(request, slug):
 585     """"
 586     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 587     without loading the whole file into memory. A similar approach can
 588     be used for large dynamic PDF files.
 589     """
 590     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 591
 592     formats = []
 593     form = forms.DownloadFormatsForm(request.GET)
 594     if form.is_valid():
 595         formats = form.cleaned_data['formats']
 596     if len(formats) == 0:
 597         formats = ['pdf', 'epub', 'odt', 'txt']
 598
 599     # Create a ZIP archive
 600     temp = tempfile.TemporaryFile()
 601     archive = zipfile.ZipFile(temp, 'w')
 602
 603     already = set()
 604     for book in collect_books(models.Book.tagged.with_all(shelf)):
 605         if 'pdf' in formats and book.pdf_file:
 606             filename = book.pdf_file.path
 607             archive.write(filename, str('%s.pdf' % book.slug))
 608         if book.root_ancestor not in already and 'epub' in formats and book.root_ancestor.epub_file:
 609             filename = book.root_ancestor.epub_file.path
 610             archive.write(filename, str('%s.epub' % book.root_ancestor.slug))
 611             already.add(book.root_ancestor)
 612         if 'odt' in formats and book.has_media("odt"):
 613             for file in book.get_media("odt"):
 614                 filename = file.file.path
 615                 archive.write(filename, str('%s.odt' % slughifi(file.name)))
 616         if 'txt' in formats and book.txt_file:
 617             filename = book.txt_file.path
 618             archive.write(filename, str('%s.txt' % book.slug))
 619     archive.close()
 620
 621     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 622     response['Content-Disposition'] = 'attachment; filename=%s.zip' % slughifi(shelf.name)
 623     response['Content-Length'] = temp.tell()
 624
 625     temp.seek(0)
 626     response.write(temp.read())
 627     return response
 628
 629
 630 @cache.never_cache
 631 def shelf_book_formats(request, shelf):
 632     """"
 633     Returns a list of formats of books in shelf.
 634     """
 635     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 636
 637     formats = {'pdf': False, 'epub': False, 'odt': False, 'txt': False}
 638
 639     for book in collect_books(models.Book.tagged.with_all(shelf)):
 640         if book.pdf_file:
 641             formats['pdf'] = True
 642         if book.root_ancestor.epub_file:
 643             formats['epub'] = True
 644         if book.txt_file:
 645             formats['txt'] = True
 646         for format in ('odt',):
 647             if book.has_media(format):
 648                 formats[format] = True
 649
 650     return HttpResponse(LazyEncoder().encode(formats))
 651
 652
 653 @login_required
 654 @require_POST
 655 @cache.never_cache
 656 def new_set(request):
 657     new_set_form = forms.NewSetForm(request.POST)
 658     if new_set_form.is_valid():
 659         new_set = new_set_form.save(request.user)
 660
 661         if request.is_ajax():
 662             return JSONResponse('{"id":"%d", "name":"%s", "msg":"<p>Shelf <strong>%s</strong> was successfully created</p>"}' % (new_set.id, new_set.name, new_set))
 663         else:
 664             return HttpResponseRedirect('/')
 665
 666     return HttpResponseRedirect('/')
 667
 668
 669 @login_required
 670 @require_POST
 671 @cache.never_cache
 672 def delete_shelf(request, slug):
 673     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 674     user_set.delete()
 675
 676     if request.is_ajax():
 677         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 678     else:
 679         return HttpResponseRedirect('/')
 680
 681
 682 # ==================
 683 # = Authentication =
 684 # ==================
 685 @require_POST
 686 @cache.never_cache
 687 def login(request):
 688     form = AuthenticationForm(data=request.POST, prefix='login')
 689     if form.is_valid():
 690         auth.login(request, form.get_user())
 691         response_data = {'success': True, 'errors': {}}
 692     else:
 693         response_data = {'success': False, 'errors': form.errors}
 694     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 695
 696
 697 @require_POST
 698 @cache.never_cache
 699 def register(request):
 700     registration_form = UserCreationForm(request.POST, prefix='registration')
 701     if registration_form.is_valid():
 702         user = registration_form.save()
 703         user = auth.authenticate(
 704             username=registration_form.cleaned_data['username'],
 705             password=registration_form.cleaned_data['password1']
 706         )
 707         auth.login(request, user)
 708         response_data = {'success': True, 'errors': {}}
 709     else:
 710         response_data = {'success': False, 'errors': registration_form.errors}
 711     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 712
 713
 714 @cache.never_cache
 715 def logout_then_redirect(request):
 716     auth.logout(request)
 717     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 718
 719
 720
 721 # =========
 722 # = Admin =
 723 # =========
 724 @login_required
 725 @staff_required
 726 def import_book(request):
 727     """docstring for import_book"""
 728     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 729     if book_import_form.is_valid():
 730         try:
 731             book_import_form.save()
 732         except:
 733             info = sys.exc_info()
 734             exception = pprint.pformat(info[1])
 735             tb = '\n'.join(traceback.format_tb(info[2]))
 736             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 737         return HttpResponse(_("Book imported successfully"))
 738     else:
 739         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 740
 741
 742
 743 def clock(request):
 744     """ Provides server time for jquery.countdown,
 745     in a format suitable for Date.parse()
 746     """
 747     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))
 748
 749
 750 @cache.never_cache
 751 def xmls(request):
 752     """"
 753     Create a zip archive with all XML files.
 754     This should be removed when we have real API.
 755     """
 756     temp = tempfile.TemporaryFile()
 757     archive = zipfile.ZipFile(temp, 'w')
 758
 759     for book in models.Book.objects.all():
 760         archive.write(book.xml_file.path, str('%s.xml' % book.slug))
 761     archive.close()
 762
 763     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 764     response['Content-Disposition'] = 'attachment; filename=xmls.zip'
 765     response['Content-Length'] = temp.tell()
 766
 767     temp.seek(0)
 768     response.write(temp.read())
 769     return response