apps/catalogue/views.py

   1 # -*- coding: utf-8 -*-
   2 import tempfile
   3 import zipfile
   4 import sys
   5 import pprint
   6 import traceback
   7
   8 from django.template import RequestContext
   9 from django.shortcuts import render_to_response, get_object_or_404
  10 from django.http import HttpResponse, HttpResponseRedirect, Http404
  11 from django.core.urlresolvers import reverse
  12 from django.db.models import Q
  13 from django.contrib.auth.decorators import login_required, user_passes_test
  14 from django.utils.datastructures import SortedDict
  15 from django.views.decorators.http import require_POST
  16 from django.contrib import auth
  17 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  18 from django.utils import simplejson
  19 from django.utils.functional import Promise
  20 from django.utils.encoding import force_unicode
  21 from django.views.decorators import cache
  22
  23 from catalogue import models
  24 from catalogue import forms
  25 from catalogue.utils import split_tags
  26 from newtagging import views as newtagging_views
  27
  28
  29 staff_required = user_passes_test(lambda user: user.is_staff)
  30
  31
  32 class LazyEncoder(simplejson.JSONEncoder):
  33     def default(self, obj):
  34         if isinstance(obj, Promise):
  35             return force_unicode(obj)
  36         return obj
  37
  38
  39 def main_page(request):
  40     if request.user.is_authenticated():
  41         shelves = models.Tag.objects.filter(category='set', user=request.user)
  42         new_set_form = forms.NewSetForm()
  43     extra_where = 'NOT catalogue_tag.category = "set"'
  44     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
  45     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
  46         extra={'where': ['catalogue_tag.category = "theme"'] + [extra_where]})
  47     categories = split_tags(tags)
  48
  49     form = forms.SearchForm()
  50     return render_to_response('catalogue/main_page.html', locals(),
  51         context_instance=RequestContext(request))
  52
  53
  54 def book_list(request):
  55     books = models.Book.objects.all()
  56     form = forms.SearchForm()
  57
  58     books_by_first_letter = SortedDict()
  59     for book in books:
  60         books_by_first_letter.setdefault(book.title[0], []).append(book)
  61
  62     return render_to_response('catalogue/book_list.html', locals(),
  63         context_instance=RequestContext(request))
  64
  65
  66 def tagged_object_list(request, tags=''):
  67     # Prevent DoS attacks on our database
  68     if len(tags.split('/')) > 6:
  69         raise Http404
  70
  71     try:
  72         tags = models.Tag.get_tag_list(tags)
  73     except models.Tag.DoesNotExist:
  74         raise Http404
  75
  76     if len([tag for tag in tags if tag.category == 'book']):
  77         raise Http404
  78
  79     model = models.Book
  80     shelf = [tag for tag in tags if tag.category == 'set']
  81     shelf_is_set = (len(tags) == 1 and tags[0].category == 'set')
  82     theme_is_set = len([tag for tag in tags if tag.category == 'theme']) > 0
  83     if theme_is_set:
  84         model = models.Fragment
  85
  86     user_is_owner = (len(shelf) and request.user.is_authenticated() and request.user == shelf[0].user)
  87
  88     extra_where = 'catalogue_tag.category NOT IN ("set", "book")'
  89     related_tags = models.Tag.objects.related_for_model(tags, model, counts=True, extra={'where': [extra_where]})
  90     categories = split_tags(related_tags)
  91
  92     if not (theme_is_set or shelf_is_set):
  93         model=models.Book.objects.filter(parent=None)
  94
  95     return newtagging_views.tagged_object_list(
  96         request,
  97         tag_model=models.Tag,
  98         queryset_or_model=model,
  99         tags=tags,
 100         template_name='catalogue/tagged_object_list.html',
 101         extra_context = {
 102             'categories': categories,
 103             'shelf_is_set': shelf_is_set,
 104             'user_is_owner': user_is_owner,
 105             'formats_form': forms.DownloadFormatsForm(),
 106         },
 107     )
 108
 109
 110 def book_fragments(request, book_slug, theme_slug):
 111     book = get_object_or_404(models.Book, slug=book_slug)
 112     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug)
 113     theme = get_object_or_404(models.Tag, slug=theme_slug)
 114     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 115
 116     form = forms.SearchForm()
 117     return render_to_response('catalogue/book_fragments.html', locals(),
 118         context_instance=RequestContext(request))
 119
 120
 121 def book_detail(request, slug):
 122     book = get_object_or_404(models.Book, slug=slug)
 123     book_tag = get_object_or_404(models.Tag, slug = 'l-' + slug)
 124     tags = list(book.tags.filter(~Q(category='set')))
 125     categories = split_tags(tags)
 126     book_children = book.children.all().order_by('parent_number')
 127     extra_where = 'catalogue_tag.category = "theme"'
 128     book_themes = models.Tag.objects.related_for_model(book_tag, models.Fragment, counts=True, extra={'where': [extra_where]})
 129     extra_info = book.get_extra_info_value()
 130
 131     form = forms.SearchForm()
 132     return render_to_response('catalogue/book_detail.html', locals(),
 133         context_instance=RequestContext(request))
 134
 135
 136 def book_text(request, slug):
 137     book = get_object_or_404(models.Book, slug=slug)
 138     book_themes = {}
 139     for fragment in book.fragments.all():
 140         for theme in fragment.tags.filter(category='theme'):
 141             book_themes.setdefault(theme, []).append(fragment)
 142
 143     book_themes = book_themes.items()
 144     book_themes.sort(key=lambda s: s[0].sort_key)
 145     return render_to_response('catalogue/book_text.html', locals(),
 146         context_instance=RequestContext(request))
 147
 148
 149 # ==========
 150 # = Search =
 151 # ==========
 152 def _tags_starting_with(prefix, user):
 153     books = models.Book.objects.filter(title__icontains=prefix)
 154     tags = models.Tag.objects.filter(name__icontains=prefix)
 155     if user.is_authenticated():
 156         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 157     else:
 158         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 159
 160     return list(books) + list(tags)
 161
 162
 163 def search(request):
 164     tags = request.GET.get('tags', '')
 165     prefix = request.GET.get('q', '')
 166     # Prefix must have at least 2 characters
 167     if len(prefix) < 2:
 168         return HttpResponse('')
 169
 170     try:
 171         tag_list = models.Tag.get_tag_list(tags)
 172     except:
 173         tag_list = []
 174
 175     result = _tags_starting_with(prefix, request.user)
 176     if len(result) > 0:
 177         tag = result[0]
 178         if isinstance(tag, models.Book):
 179             return HttpResponseRedirect(tag.get_absolute_url())
 180         else:
 181             tag_list.append(tag)
 182
 183     return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list',
 184         kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
 185     ))
 186
 187
 188 def tags_starting_with(request):
 189     prefix = request.GET.get('q', '')
 190     # Prefix must have at least 2 characters
 191     if len(prefix) < 2:
 192         return HttpResponse('')
 193
 194     return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
 195
 196
 197 # ====================
 198 # = Shelf management =
 199 # ====================
 200 @login_required
 201 @cache.never_cache
 202 def user_shelves(request):
 203     shelves = models.Tag.objects.filter(category='set', user=request.user)
 204     new_set_form = forms.NewSetForm()
 205     return render_to_response('catalogue/user_shelves.html', locals(),
 206             context_instance=RequestContext(request))
 207
 208 @cache.never_cache
 209 def book_sets(request, slug):
 210     book = get_object_or_404(models.Book, slug=slug)
 211     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 212     book_sets = book.tags.filter(category='set', user=request.user)
 213
 214     if not request.user.is_authenticated():
 215         return HttpResponse('<p>Aby zarządzać swoimi półkami, musisz się zalogować.</p>')
 216
 217     if request.method == 'POST':
 218         form = forms.ObjectSetsForm(book, request.user, request.POST)
 219         if form.is_valid():
 220             old_shelves = list(book.tags.filter(category='set'))
 221             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 222
 223             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 224                 shelf.book_count -= 1
 225                 shelf.save()
 226
 227             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 228                 shelf.book_count += 1
 229                 shelf.save()
 230
 231             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 232             if request.is_ajax():
 233                 return HttpResponse('<p>Półki zostały zapisane.</p>')
 234             else:
 235                 return HttpResponseRedirect('/')
 236     else:
 237         form = forms.ObjectSetsForm(book, request.user)
 238         new_set_form = forms.NewSetForm()
 239
 240     return render_to_response('catalogue/book_sets.html', locals(),
 241         context_instance=RequestContext(request))
 242
 243
 244 @login_required
 245 @require_POST
 246 @cache.never_cache
 247 def remove_from_shelf(request, shelf, book):
 248     book = get_object_or_404(models.Book, slug=book)
 249     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 250
 251     models.Tag.objects.remove_tag(book, shelf)
 252
 253     shelf.book_count -= 1
 254     shelf.save()
 255
 256     return HttpResponse('Usunieto')
 257
 258
 259 def collect_books(books):
 260     """
 261     Returns all real books in collection.
 262     """
 263     result = []
 264     for book in books:
 265         if len(book.children.all()) == 0:
 266             result.append(book)
 267         else:
 268             result += collect_books(book.children.all())
 269     return result
 270
 271
 272 @cache.never_cache
 273 def download_shelf(request, slug):
 274     """"
 275     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 276     without loading the whole file into memory. A similar approach can
 277     be used for large dynamic PDF files.
 278     """
 279     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 280
 281     formats = []
 282     form = forms.DownloadFormatsForm(request.GET)
 283     if form.is_valid():
 284         formats = form.cleaned_data['formats']
 285     if len(formats) == 0:
 286         formats = ['pdf', 'odt', 'txt', 'mp3', 'ogg']
 287
 288     # Create a ZIP archive
 289     temp = temp = tempfile.TemporaryFile()
 290     archive = zipfile.ZipFile(temp, 'w')
 291
 292     for book in collect_books(models.Book.tagged.with_all(shelf)):
 293         if 'pdf' in formats and book.pdf_file:
 294             filename = book.pdf_file.path
 295             archive.write(filename, str('%s.pdf' % book.slug))
 296         if 'odt' in formats and book.odt_file:
 297             filename = book.odt_file.path
 298             archive.write(filename, str('%s.odt' % book.slug))
 299         if 'txt' in formats and book.txt_file:
 300             filename = book.txt_file.path
 301             archive.write(filename, str('%s.txt' % book.slug))
 302         if 'mp3' in formats and book.mp3_file:
 303             filename = book.mp3_file.path
 304             archive.write(filename, str('%s.mp3' % book.slug))
 305         if 'ogg' in formats and book.ogg_file:
 306             filename = book.ogg_file.path
 307             archive.write(filename, str('%s.ogg' % book.slug))
 308     archive.close()
 309
 310     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 311     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 312     response['Content-Length'] = temp.tell()
 313
 314     temp.seek(0)
 315     response.write(temp.read())
 316     return response
 317
 318
 319 @cache.never_cache
 320 def shelf_book_formats(request, shelf):
 321     """"
 322     Returns a list of formats of books in shelf.
 323     """
 324     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 325
 326     formats = {'pdf': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False}
 327
 328     for book in collect_books(models.Book.tagged.with_all(shelf)):
 329         if book.pdf_file:
 330             formats['pdf'] = True
 331         if book.odt_file:
 332             formats['odt'] = True
 333         if book.txt_file:
 334             formats['txt'] = True
 335         if book.mp3_file:
 336             formats['mp3'] = True
 337         if book.ogg_file:
 338             formats['ogg'] = True
 339
 340     return HttpResponse(LazyEncoder().encode(formats))
 341
 342
 343 @login_required
 344 @require_POST
 345 @cache.never_cache
 346 def new_set(request):
 347     new_set_form = forms.NewSetForm(request.POST)
 348     if new_set_form.is_valid():
 349         new_set = new_set_form.save(request.user)
 350
 351         if request.is_ajax():
 352             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
 353         else:
 354             return HttpResponseRedirect('/')
 355
 356     return HttpResponseRedirect('/')
 357
 358
 359 @login_required
 360 @require_POST
 361 @cache.never_cache
 362 def delete_shelf(request, slug):
 363     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 364     user_set.delete()
 365
 366     if request.is_ajax():
 367         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
 368     else:
 369         return HttpResponseRedirect('/')
 370
 371
 372 # ==================
 373 # = Authentication =
 374 # ==================
 375 @require_POST
 376 @cache.never_cache
 377 def login(request):
 378     form = AuthenticationForm(data=request.POST, prefix='login')
 379     if form.is_valid():
 380         auth.login(request, form.get_user())
 381         response_data = {'success': True, 'errors': {}}
 382     else:
 383         response_data = {'success': False, 'errors': form.errors}
 384     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 385
 386
 387 @require_POST
 388 @cache.never_cache
 389 def register(request):
 390     registration_form = UserCreationForm(request.POST, prefix='registration')
 391     if registration_form.is_valid():
 392         user = registration_form.save()
 393         user = auth.authenticate(
 394             username=registration_form.cleaned_data['username'],
 395             password=registration_form.cleaned_data['password1']
 396         )
 397         auth.login(request, user)
 398         response_data = {'success': True, 'errors': {}}
 399     else:
 400         response_data = {'success': False, 'errors': registration_form.errors}
 401     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 402
 403
 404 @cache.never_cache
 405 def logout_then_redirect(request):
 406     auth.logout(request)
 407     return HttpResponseRedirect(request.GET.get('next', '/'))
 408
 409
 410
 411 # =========
 412 # = Admin =
 413 # =========
 414 @login_required
 415 @staff_required
 416 def import_book(request):
 417     """docstring for import_book"""
 418     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 419     if book_import_form.is_valid():
 420         try:
 421             book_import_form.save()
 422         except:
 423             info = sys.exc_info()
 424             exception = pprint.pformat(info[1])
 425             tb = '\n'.join(traceback.format_tb(info[2]))
 426             return HttpResponse("An error occurred: %s\n\n%s" % (exception, tb), mimetype='text/plain')
 427         return HttpResponse("Book imported successfully")
 428     else:
 429         return HttpResponse("Error importing file: %r" % book_import_form.errors)