apps/catalogue/views.py

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