Now importing a book that already exists in our database doesn't duplicate it's fragm...
[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 @cache.cache_control(must_revalidate=True, max_age=3600)
34 def main_page(request):    
35     if request.user.is_authenticated():
36         shelves = models.Tag.objects.filter(category='set', user=request.user)
37         new_set_form = forms.NewSetForm()
38     extra_where = 'NOT catalogue_tag.category = "set"'
39     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
40     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
41         extra={'where': ['catalogue_tag.category = "theme"'] + [extra_where]})
42     categories = split_tags(tags)
43     
44     form = forms.SearchForm()
45     return render_to_response('catalogue/main_page.html', locals(),
46         context_instance=RequestContext(request))
47
48
49 def book_list(request):
50     books = models.Book.objects.all()
51     form = forms.SearchForm()
52     
53     books_by_first_letter = SortedDict()
54     for book in books:
55         books_by_first_letter.setdefault(book.title[0], []).append(book)
56     
57     return render_to_response('catalogue/book_list.html', locals(),
58         context_instance=RequestContext(request))
59
60
61 @cache.cache_control(must_revalidate=True, max_age=3600)
62 def tagged_object_list(request, tags=''):
63     # Prevent DoS attacks on our database
64     if len(tags.split('/')) > 6:
65         raise Http404
66         
67     try:
68         tags = models.Tag.get_tag_list(tags)
69     except models.Tag.DoesNotExist:
70         raise Http404
71     
72     model = models.Book
73     shelf_is_set = (len(tags) == 1 and tags[0].category == 'set')
74     theme_is_set = len([tag for tag in tags if tag.category == 'theme']) > 0
75     if theme_is_set:
76         model = models.Fragment
77
78     extra_where = 'NOT catalogue_tag.category = "set"'
79     related_tags = models.Tag.objects.related_for_model(tags, model, counts=True, extra={'where': [extra_where]})
80     categories = split_tags(related_tags)
81
82     if not theme_is_set:
83         model=models.Book.objects.filter(parent=None)
84     
85     return newtagging_views.tagged_object_list(
86         request,
87         tag_model=models.Tag,
88         queryset_or_model=model,
89         tags=tags,
90         template_name='catalogue/tagged_object_list.html',
91         extra_context = {'categories': categories, 'shelf_is_set': shelf_is_set },
92     )
93
94
95 def book_detail(request, slug):
96     book = get_object_or_404(models.Book, slug=slug)
97     tags = list(book.tags.filter(~Q(category='set')))
98     categories = split_tags(tags)
99     book_children = book.children.all().order_by('parent_number')
100     
101     form = forms.SearchForm()
102     return render_to_response('catalogue/book_detail.html', locals(),
103         context_instance=RequestContext(request))
104
105
106 def book_text(request, slug):
107     book = get_object_or_404(models.Book, slug=slug)
108     book_themes = {}
109     for fragment in book.fragments.all():
110         for theme in fragment.tags.filter(category='theme'):
111             book_themes.setdefault(theme, []).append(fragment)
112     
113     book_themes = book_themes.items()
114     book_themes.sort(key=lambda s: s[0].sort_key)
115     return render_to_response('catalogue/book_text.html', locals(),
116         context_instance=RequestContext(request))
117
118
119 # ==========
120 # = Search =
121 # ==========
122 def _tags_starting_with(prefix, user):
123     books = models.Book.objects.filter(title__icontains=prefix)
124     tags = models.Tag.objects.filter(name__icontains=prefix)
125     if user.is_authenticated():
126         tags = tags.filter(~Q(category='set') | Q(user=user))
127     else:
128         tags = tags.filter(~Q(category='set'))
129
130     return list(books) + list(tags)
131         
132
133 def search(request):
134     tags = request.GET.get('tags', '')
135     prefix = request.GET.get('q', '')
136     # Prefix must have at least 2 characters
137     if len(prefix) < 2:
138         return HttpResponse('')
139     
140     try:
141         tag_list = models.Tag.get_tag_list(tags)
142     except:
143         tag_list = []
144     
145     result = _tags_starting_with(prefix, request.user)
146     if len(result) > 0:
147         tag = result[0]
148         if isinstance(tag, models.Book):
149             return HttpResponseRedirect(tag.get_absolute_url())
150         else:
151             tag_list.append(tag)
152         
153     return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list', 
154         kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
155     ))
156
157
158 def tags_starting_with(request):
159     prefix = request.GET['q']
160     # Prefix must have at least 2 characters
161     if len(prefix) < 2:
162         return HttpResponse('')
163     
164     return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
165
166
167 # ====================
168 # = Shelf management =
169 # ====================
170 @login_required
171 @cache.never_cache
172 def user_shelves(request):
173     shelves = models.Tag.objects.filter(category='set', user=request.user)
174     new_set_form = forms.NewSetForm()
175     return render_to_response('catalogue/user_shelves.html', locals(),
176             context_instance=RequestContext(request))
177
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             book.tags = ([models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']] +
192                 list(book.tags.filter(~Q(category='set') | ~Q(user=request.user))))
193             if request.is_ajax():
194                 return HttpResponse('<p>Półki zostały zapisane.</p>')
195             else:
196                 return HttpResponseRedirect('/')
197     else:
198         form = forms.ObjectSetsForm(book, request.user)
199         new_set_form = forms.NewSetForm()
200     
201     return render_to_response('catalogue/book_sets.html', locals(),
202         context_instance=RequestContext(request))
203
204
205 @cache.never_cache
206 def download_shelf(request, slug):
207     """"
208     Create a ZIP archive on disk and transmit it in chunks of 8KB,
209     without loading the whole file into memory. A similar approach can
210     be used for large dynamic PDF files.                                        
211     """
212     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
213             
214     # Create a ZIP archive
215     temp = temp = tempfile.TemporaryFile()
216     archive = zipfile.ZipFile(temp, 'w')
217     for book in models.Book.tagged.with_all(shelf):
218         if book.pdf_file:
219             filename = book.pdf_file.path
220             archive.write(filename, str('%s.pdf' % book.slug))
221         if book.odt_file:
222             filename = book.odt_file.path
223             archive.write(filename, str('%s.odt' % book.slug))
224         if book.txt_file:
225             filename = book.txt_file.path
226             archive.write(filename, str('%s.txt' % book.slug))
227     archive.close()
228     
229     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
230     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
231     response['Content-Length'] = temp.tell()
232     
233     temp.seek(0)
234     response.write(temp.read())
235     return response
236
237
238 @login_required
239 @require_POST
240 @cache.never_cache
241 def new_set(request):
242     new_set_form = forms.NewSetForm(request.POST)
243     if new_set_form.is_valid():
244         new_set = new_set_form.save(request.user)
245
246         if request.is_ajax():
247             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
248         else:
249             return HttpResponseRedirect('/')
250
251     return render_to_response('catalogue/book_sets.html', locals(),
252             context_instance=RequestContext(request))
253
254
255 @login_required
256 @require_POST
257 @cache.never_cache
258 def delete_shelf(request, slug):
259     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
260     user_set.delete()
261
262     if request.is_ajax():
263         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
264     else:
265         return HttpResponseRedirect('/')
266
267
268 # ==================
269 # = Authentication =
270 # ==================
271 @require_POST
272 @cache.never_cache
273 def login(request):
274     form = AuthenticationForm(data=request.POST, prefix='login')
275     if form.is_valid():
276         auth.login(request, form.get_user())
277         response_data = {'success': True, 'errors': {}}
278     else:
279         response_data = {'success': False, 'errors': form.errors}
280     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
281
282
283 @require_POST
284 @cache.never_cache
285 def register(request):
286     registration_form = UserCreationForm(request.POST, prefix='registration')
287     if registration_form.is_valid():
288         user = registration_form.save()
289         user = auth.authenticate(
290             username=registration_form.cleaned_data['username'], 
291             password=registration_form.cleaned_data['password1']
292         )
293         auth.login(request, user)
294         response_data = {'success': True, 'errors': {}}
295     else:
296         response_data = {'success': False, 'errors': registration_form.errors}
297     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
298
299
300 @cache.never_cache
301 def logout_then_redirect(request):
302     auth.logout(request)
303     return HttpResponseRedirect(request.GET.get('next', '/'))
304