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
  11 from django.template import RequestContext
  12 from django.shortcuts import render_to_response, get_object_or_404
  13 from django.http import HttpResponse, HttpResponseRedirect, Http404
  14 from django.core.urlresolvers import reverse
  15 from django.db.models import Q
  16 from django.contrib.auth.decorators import login_required, user_passes_test
  17 from django.utils.datastructures import SortedDict
  18 from django.views.decorators.http import require_POST
  19 from django.contrib import auth
  20 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  21 from django.utils import simplejson
  22 from django.utils.functional import Promise
  23 from django.utils.encoding import force_unicode
  24 from django.views.decorators import cache
  25
  26 from catalogue import models
  27 from catalogue import forms
  28 from catalogue.utils import split_tags
  29 from newtagging import views as newtagging_views
  30
  31
  32 staff_required = user_passes_test(lambda user: user.is_staff)
  33
  34
  35 class LazyEncoder(simplejson.JSONEncoder):
  36     def default(self, obj):
  37         if isinstance(obj, Promise):
  38             return force_unicode(obj)
  39         return obj
  40
  41
  42 def main_page(request):
  43     if request.user.is_authenticated():
  44         shelves = models.Tag.objects.filter(category='set', user=request.user)
  45         new_set_form = forms.NewSetForm()
  46     extra_where = 'NOT catalogue_tag.category = "set"'
  47     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
  48     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
  49         extra={'where': ['catalogue_tag.category = "theme"'] + [extra_where]})
  50     categories = split_tags(tags)
  51
  52     form = forms.SearchForm()
  53     return render_to_response('catalogue/main_page.html', locals(),
  54         context_instance=RequestContext(request))
  55
  56
  57 def book_list(request):
  58     books = models.Book.objects.all()
  59     form = forms.SearchForm()
  60
  61     books_by_first_letter = SortedDict()
  62     for book in books:
  63         books_by_first_letter.setdefault(book.title[0], []).append(book)
  64
  65     return render_to_response('catalogue/book_list.html', locals(),
  66         context_instance=RequestContext(request))
  67
  68
  69 def tagged_object_list(request, tags=''):
  70     # Prevent DoS attacks on our database
  71     if len(tags.split('/')) > 6:
  72         raise Http404
  73
  74     try:
  75         tags = models.Tag.get_tag_list(tags)
  76     except models.Tag.DoesNotExist:
  77         raise Http404
  78
  79     if len([tag for tag in tags if tag.category == 'book']):
  80         raise Http404
  81
  82     model = models.Book
  83     shelf = [tag for tag in tags if tag.category == 'set']
  84     shelf_is_set = (len(tags) == 1 and tags[0].category == 'set')
  85     theme_is_set = len([tag for tag in tags if tag.category == 'theme']) > 0
  86     if theme_is_set:
  87         model = models.Fragment
  88
  89     user_is_owner = (len(shelf) and request.user.is_authenticated() and request.user == shelf[0].user)
  90
  91     extra_where = 'catalogue_tag.category NOT IN ("set", "book")'
  92     related_tags = models.Tag.objects.related_for_model(tags, model, counts=True, extra={'where': [extra_where]})
  93     categories = split_tags(related_tags)
  94
  95     if not (theme_is_set or shelf_is_set):
  96         model=models.Book.objects.filter(parent=None)
  97
  98     return newtagging_views.tagged_object_list(
  99         request,
 100         tag_model=models.Tag,
 101         queryset_or_model=model,
 102         tags=tags,
 103         template_name='catalogue/tagged_object_list.html',
 104         extra_context = {
 105             'categories': categories,
 106             'shelf_is_set': shelf_is_set,
 107             'user_is_owner': user_is_owner,
 108             'formats_form': forms.DownloadFormatsForm(),
 109         },
 110     )
 111
 112
 113 def book_fragments(request, book_slug, theme_slug):
 114     book = get_object_or_404(models.Book, slug=book_slug)
 115     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug)
 116     theme = get_object_or_404(models.Tag, slug=theme_slug)
 117     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 118
 119     form = forms.SearchForm()
 120     return render_to_response('catalogue/book_fragments.html', locals(),
 121         context_instance=RequestContext(request))
 122
 123
 124 def book_detail(request, slug):
 125     book = get_object_or_404(models.Book, slug=slug)
 126     book_tag = get_object_or_404(models.Tag, slug = 'l-' + slug)
 127     tags = list(book.tags.filter(~Q(category='set')))
 128     categories = split_tags(tags)
 129     book_children = book.children.all().order_by('parent_number')
 130     extra_where = 'catalogue_tag.category = "theme"'
 131     book_themes = models.Tag.objects.related_for_model(book_tag, models.Fragment, counts=True, extra={'where': [extra_where]})
 132     extra_info = book.get_extra_info_value()
 133
 134     form = forms.SearchForm()
 135     return render_to_response('catalogue/book_detail.html', locals(),
 136         context_instance=RequestContext(request))
 137
 138
 139 def book_text(request, slug):
 140     book = get_object_or_404(models.Book, slug=slug)
 141     book_themes = {}
 142     for fragment in book.fragments.all():
 143         for theme in fragment.tags.filter(category='theme'):
 144             book_themes.setdefault(theme, []).append(fragment)
 145
 146     book_themes = book_themes.items()
 147     book_themes.sort(key=lambda s: s[0].sort_key)
 148     return render_to_response('catalogue/book_text.html', locals(),
 149         context_instance=RequestContext(request))
 150
 151
 152 # ==========
 153 # = Search =
 154 # ==========
 155 def _tags_starting_with(prefix, user):
 156     books = models.Book.objects.filter(title__icontains=prefix)
 157     tags = models.Tag.objects.filter(name__icontains=prefix)
 158     if user.is_authenticated():
 159         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 160     else:
 161         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 162
 163     return list(books) + list(tags)
 164
 165
 166 def search(request):
 167     tags = request.GET.get('tags', '')
 168     prefix = request.GET.get('q', '')
 169     # Prefix must have at least 2 characters
 170     if len(prefix) < 2:
 171         return HttpResponse('')
 172
 173     try:
 174         tag_list = models.Tag.get_tag_list(tags)
 175     except:
 176         tag_list = []
 177
 178     result = _tags_starting_with(prefix, request.user)
 179     if len(result) > 0:
 180         tag = result[0]
 181         if isinstance(tag, models.Book):
 182             return HttpResponseRedirect(tag.get_absolute_url())
 183         else:
 184             tag_list.append(tag)
 185
 186     return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list',
 187         kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
 188     ))
 189
 190
 191 def tags_starting_with(request):
 192     prefix = request.GET.get('q', '')
 193     # Prefix must have at least 2 characters
 194     if len(prefix) < 2:
 195         return HttpResponse('')
 196
 197     return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
 198
 199
 200 # ====================
 201 # = Shelf management =
 202 # ====================
 203 @login_required
 204 @cache.never_cache
 205 def user_shelves(request):
 206     shelves = models.Tag.objects.filter(category='set', user=request.user)
 207     new_set_form = forms.NewSetForm()
 208     return render_to_response('catalogue/user_shelves.html', locals(),
 209             context_instance=RequestContext(request))
 210
 211 @cache.never_cache
 212 def book_sets(request, slug):
 213     book = get_object_or_404(models.Book, slug=slug)
 214     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 215     book_sets = book.tags.filter(category='set', user=request.user)
 216
 217     if not request.user.is_authenticated():
 218         return HttpResponse('<p>Aby zarządzać swoimi półkami, musisz się zalogować.</p>')
 219
 220     if request.method == 'POST':
 221         form = forms.ObjectSetsForm(book, request.user, request.POST)
 222         if form.is_valid():
 223             old_shelves = list(book.tags.filter(category='set'))
 224             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 225
 226             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 227                 shelf.book_count -= 1
 228                 shelf.save()
 229
 230             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 231                 shelf.book_count += 1
 232                 shelf.save()
 233
 234             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 235             if request.is_ajax():
 236                 return HttpResponse('<p>Półki zostały zapisane.</p>')
 237             else:
 238                 return HttpResponseRedirect('/')
 239     else:
 240         form = forms.ObjectSetsForm(book, request.user)
 241         new_set_form = forms.NewSetForm()
 242
 243     return render_to_response('catalogue/book_sets.html', locals(),
 244         context_instance=RequestContext(request))
 245
 246
 247 @login_required
 248 @require_POST
 249 @cache.never_cache
 250 def remove_from_shelf(request, shelf, book):
 251     book = get_object_or_404(models.Book, slug=book)
 252     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 253
 254     models.Tag.objects.remove_tag(book, shelf)
 255
 256     shelf.book_count -= 1
 257     shelf.save()
 258
 259     return HttpResponse('Usunieto')
 260
 261
 262 def collect_books(books):
 263     """
 264     Returns all real books in collection.
 265     """
 266     result = []
 267     for book in books:
 268         if len(book.children.all()) == 0:
 269             result.append(book)
 270         else:
 271             result += collect_books(book.children.all())
 272     return result
 273
 274
 275 @cache.never_cache
 276 def download_shelf(request, slug):
 277     """"
 278     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 279     without loading the whole file into memory. A similar approach can
 280     be used for large dynamic PDF files.
 281     """
 282     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 283
 284     formats = []
 285     form = forms.DownloadFormatsForm(request.GET)
 286     if form.is_valid():
 287         formats = form.cleaned_data['formats']
 288     if len(formats) == 0:
 289         formats = ['pdf', 'odt', 'txt', 'mp3', 'ogg']
 290
 291     # Create a ZIP archive
 292     temp = temp = tempfile.TemporaryFile()
 293     archive = zipfile.ZipFile(temp, 'w')
 294
 295     for book in collect_books(models.Book.tagged.with_all(shelf)):
 296         if 'pdf' in formats and book.pdf_file:
 297             filename = book.pdf_file.path
 298             archive.write(filename, str('%s.pdf' % book.slug))
 299         if 'odt' in formats and book.odt_file:
 300             filename = book.odt_file.path
 301             archive.write(filename, str('%s.odt' % book.slug))
 302         if 'txt' in formats and book.txt_file:
 303             filename = book.txt_file.path
 304             archive.write(filename, str('%s.txt' % book.slug))
 305         if 'mp3' in formats and book.mp3_file:
 306             filename = book.mp3_file.path
 307             archive.write(filename, str('%s.mp3' % book.slug))
 308         if 'ogg' in formats and book.ogg_file:
 309             filename = book.ogg_file.path
 310             archive.write(filename, str('%s.ogg' % book.slug))
 311     archive.close()
 312
 313     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 314     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 315     response['Content-Length'] = temp.tell()
 316
 317     temp.seek(0)
 318     response.write(temp.read())
 319     return response
 320
 321
 322 @cache.never_cache
 323 def shelf_book_formats(request, shelf):
 324     """"
 325     Returns a list of formats of books in shelf.
 326     """
 327     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 328
 329     formats = {'pdf': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False}
 330
 331     for book in collect_books(models.Book.tagged.with_all(shelf)):
 332         if book.pdf_file:
 333             formats['pdf'] = True
 334         if book.odt_file:
 335             formats['odt'] = True
 336         if book.txt_file:
 337             formats['txt'] = True
 338         if book.mp3_file:
 339             formats['mp3'] = True
 340         if book.ogg_file:
 341             formats['ogg'] = True
 342
 343     return HttpResponse(LazyEncoder().encode(formats))
 344
 345
 346 @login_required
 347 @require_POST
 348 @cache.never_cache
 349 def new_set(request):
 350     new_set_form = forms.NewSetForm(request.POST)
 351     if new_set_form.is_valid():
 352         new_set = new_set_form.save(request.user)
 353
 354         if request.is_ajax():
 355             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
 356         else:
 357             return HttpResponseRedirect('/')
 358
 359     return HttpResponseRedirect('/')
 360
 361
 362 @login_required
 363 @require_POST
 364 @cache.never_cache
 365 def delete_shelf(request, slug):
 366     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 367     user_set.delete()
 368
 369     if request.is_ajax():
 370         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
 371     else:
 372         return HttpResponseRedirect('/')
 373
 374
 375 # ==================
 376 # = Authentication =
 377 # ==================
 378 @require_POST
 379 @cache.never_cache
 380 def login(request):
 381     form = AuthenticationForm(data=request.POST, prefix='login')
 382     if form.is_valid():
 383         auth.login(request, form.get_user())
 384         response_data = {'success': True, 'errors': {}}
 385     else:
 386         response_data = {'success': False, 'errors': form.errors}
 387     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 388
 389
 390 @require_POST
 391 @cache.never_cache
 392 def register(request):
 393     registration_form = UserCreationForm(request.POST, prefix='registration')
 394     if registration_form.is_valid():
 395         user = registration_form.save()
 396         user = auth.authenticate(
 397             username=registration_form.cleaned_data['username'],
 398             password=registration_form.cleaned_data['password1']
 399         )
 400         auth.login(request, user)
 401         response_data = {'success': True, 'errors': {}}
 402     else:
 403         response_data = {'success': False, 'errors': registration_form.errors}
 404     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 405
 406
 407 @cache.never_cache
 408 def logout_then_redirect(request):
 409     auth.logout(request)
 410     return HttpResponseRedirect(request.GET.get('next', '/'))
 411
 412
 413
 414 # =========
 415 # = Admin =
 416 # =========
 417 @login_required
 418 @staff_required
 419 def import_book(request):
 420     """docstring for import_book"""
 421     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 422     if book_import_form.is_valid():
 423         try:
 424             book_import_form.save()
 425         except:
 426             info = sys.exc_info()
 427             exception = pprint.pformat(info[1])
 428             tb = '\n'.join(traceback.format_tb(info[2]))
 429             return HttpResponse("An error occurred: %s\n\n%s" % (exception, tb), mimetype='text/plain')
 430         return HttpResponse("Book imported successfully")
 431     else:
 432         return HttpResponse("Error importing file: %r" % book_import_form.errors)