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