7870cba4f255844ef31218fc25ae98dffcd10430
[wolnelektury.git] / 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