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     extra_info = book.get_extra_info_value()
 119
 120     form = forms.SearchForm()
 121     return render_to_response('catalogue/book_detail.html', locals(),
 122         context_instance=RequestContext(request))
 123
 124
 125 def book_text(request, slug):
 126     book = get_object_or_404(models.Book, slug=slug)
 127     book_themes = {}
 128     for fragment in book.fragments.all():
 129         for theme in fragment.tags.filter(category='theme'):
 130             book_themes.setdefault(theme, []).append(fragment)
 131
 132     book_themes = book_themes.items()
 133     book_themes.sort(key=lambda s: s[0].sort_key)
 134     return render_to_response('catalogue/book_text.html', locals(),
 135         context_instance=RequestContext(request))
 136
 137
 138 # ==========
 139 # = Search =
 140 # ==========
 141 def _tags_starting_with(prefix, user):
 142     books = models.Book.objects.filter(title__icontains=prefix)
 143     tags = models.Tag.objects.filter(name__icontains=prefix)
 144     if user.is_authenticated():
 145         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 146     else:
 147         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 148
 149     return list(books) + list(tags)
 150
 151
 152 def search(request):
 153     tags = request.GET.get('tags', '')
 154     prefix = request.GET.get('q', '')
 155     # Prefix must have at least 2 characters
 156     if len(prefix) < 2:
 157         return HttpResponse('')
 158
 159     try:
 160         tag_list = models.Tag.get_tag_list(tags)
 161     except:
 162         tag_list = []
 163
 164     result = _tags_starting_with(prefix, request.user)
 165     if len(result) > 0:
 166         tag = result[0]
 167         if isinstance(tag, models.Book):
 168             return HttpResponseRedirect(tag.get_absolute_url())
 169         else:
 170             tag_list.append(tag)
 171
 172     return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list',
 173         kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
 174     ))
 175
 176
 177 def tags_starting_with(request):
 178     prefix = request.GET.get('q', '')
 179     # Prefix must have at least 2 characters
 180     if len(prefix) < 2:
 181         return HttpResponse('')
 182
 183     return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
 184
 185
 186 # ====================
 187 # = Shelf management =
 188 # ====================
 189 @login_required
 190 @cache.never_cache
 191 def user_shelves(request):
 192     shelves = models.Tag.objects.filter(category='set', user=request.user)
 193     new_set_form = forms.NewSetForm()
 194     return render_to_response('catalogue/user_shelves.html', locals(),
 195             context_instance=RequestContext(request))
 196
 197 @cache.never_cache
 198 def book_sets(request, slug):
 199     book = get_object_or_404(models.Book, slug=slug)
 200     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 201     book_sets = book.tags.filter(category='set', user=request.user)
 202
 203     if not request.user.is_authenticated():
 204         return HttpResponse('<p>Aby zarządzać swoimi półkami, musisz się zalogować.</p>')
 205
 206     if request.method == 'POST':
 207         form = forms.ObjectSetsForm(book, request.user, request.POST)
 208         if form.is_valid():
 209             old_shelves = list(book.tags.filter(category='set'))
 210             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 211
 212             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 213                 shelf.book_count -= 1
 214                 shelf.save()
 215
 216             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 217                 shelf.book_count += 1
 218                 shelf.save()
 219
 220             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 221             if request.is_ajax():
 222                 return HttpResponse('<p>Półki zostały zapisane.</p>')
 223             else:
 224                 return HttpResponseRedirect('/')
 225     else:
 226         form = forms.ObjectSetsForm(book, request.user)
 227         new_set_form = forms.NewSetForm()
 228
 229     return render_to_response('catalogue/book_sets.html', locals(),
 230         context_instance=RequestContext(request))
 231
 232
 233 @login_required
 234 @require_POST
 235 @cache.never_cache
 236 def remove_from_shelf(request, shelf, book):
 237     book = get_object_or_404(models.Book, slug=book)
 238     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 239
 240     models.Tag.objects.remove_tag(book, shelf)
 241
 242     shelf.book_count -= 1
 243     shelf.save()
 244
 245     return HttpResponse('Usunieto')
 246
 247
 248 @cache.never_cache
 249 def download_shelf(request, slug):
 250     """"
 251     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 252     without loading the whole file into memory. A similar approach can
 253     be used for large dynamic PDF files.
 254     """
 255     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 256
 257     # Create a ZIP archive
 258     temp = temp = tempfile.TemporaryFile()
 259     archive = zipfile.ZipFile(temp, 'w')
 260
 261     # Collect all books to include in ZIP archive
 262     def collect_books(books):
 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     for book in collect_books(models.Book.tagged.with_all(shelf)):
 272         if book.pdf_file:
 273             filename = book.pdf_file.path
 274             archive.write(filename, str('%s.pdf' % book.slug))
 275         if book.odt_file:
 276             filename = book.odt_file.path
 277             archive.write(filename, str('%s.odt' % book.slug))
 278         if book.txt_file:
 279             filename = book.txt_file.path
 280             archive.write(filename, str('%s.txt' % book.slug))
 281     archive.close()
 282
 283     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 284     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 285     response['Content-Length'] = temp.tell()
 286
 287     temp.seek(0)
 288     response.write(temp.read())
 289     return response
 290
 291
 292 @login_required
 293 @require_POST
 294 @cache.never_cache
 295 def new_set(request):
 296     new_set_form = forms.NewSetForm(request.POST)
 297     if new_set_form.is_valid():
 298         new_set = new_set_form.save(request.user)
 299
 300         if request.is_ajax():
 301             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
 302         else:
 303             return HttpResponseRedirect('/')
 304
 305     return HttpResponseRedirect('/')
 306
 307
 308 @login_required
 309 @require_POST
 310 @cache.never_cache
 311 def delete_shelf(request, slug):
 312     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 313     user_set.delete()
 314
 315     if request.is_ajax():
 316         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
 317     else:
 318         return HttpResponseRedirect('/')
 319
 320
 321 # ==================
 322 # = Authentication =
 323 # ==================
 324 @require_POST
 325 @cache.never_cache
 326 def login(request):
 327     form = AuthenticationForm(data=request.POST, prefix='login')
 328     if form.is_valid():
 329         auth.login(request, form.get_user())
 330         response_data = {'success': True, 'errors': {}}
 331     else:
 332         response_data = {'success': False, 'errors': form.errors}
 333     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 334
 335
 336 @require_POST
 337 @cache.never_cache
 338 def register(request):
 339     registration_form = UserCreationForm(request.POST, prefix='registration')
 340     if registration_form.is_valid():
 341         user = registration_form.save()
 342         user = auth.authenticate(
 343             username=registration_form.cleaned_data['username'],
 344             password=registration_form.cleaned_data['password1']
 345         )
 346         auth.login(request, user)
 347         response_data = {'success': True, 'errors': {}}
 348     else:
 349         response_data = {'success': False, 'errors': registration_form.errors}
 350     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 351
 352
 353 @cache.never_cache
 354 def logout_then_redirect(request):
 355     auth.logout(request)
 356     return HttpResponseRedirect(request.GET.get('next', '/'))
 357