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 from django.core.servers.basehttp import FileWrapper
  20
  21 from catalogue import models
  22 from catalogue import forms
  23 from catalogue.utils import split_tags
  24 from newtagging import views as newtagging_views
  25
  26
  27 class LazyEncoder(simplejson.JSONEncoder):
  28     def default(self, obj):
  29         if isinstance(obj, Promise):
  30             return force_unicode(obj)
  31         return obj
  32
  33
  34 @cache.cache_control(must_revalidate=True, max_age=3600)
  35 def main_page(request):
  36     if request.user.is_authenticated():
  37         shelves = models.Tag.objects.filter(category='set', user=request.user)
  38         new_set_form = forms.NewSetForm()
  39     extra_where = 'NOT catalogue_tag.category = "set"'
  40     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
  41     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
  42         extra={'where': ['catalogue_tag.category = "theme"'] + [extra_where]})
  43     categories = split_tags(tags)
  44
  45     form = forms.SearchForm()
  46     return render_to_response('catalogue/main_page.html', locals(),
  47         context_instance=RequestContext(request))
  48
  49
  50 def book_list(request):
  51     books = models.Book.objects.all()
  52     form = forms.SearchForm()
  53
  54     books_by_first_letter = SortedDict()
  55     for book in books:
  56         books_by_first_letter.setdefault(book.title[0], []).append(book)
  57
  58     return render_to_response('catalogue/book_list.html', locals(),
  59         context_instance=RequestContext(request))
  60
  61
  62 @cache.cache_control(must_revalidate=True, max_age=3600)
  63 def tagged_object_list(request, tags=''):
  64     # Prevent DoS attacks on our database
  65     if len(tags.split('/')) > 6:
  66         raise Http404
  67
  68     try:
  69         tags = models.Tag.get_tag_list(tags)
  70     except models.Tag.DoesNotExist:
  71         raise Http404
  72
  73     model = models.Book
  74     shelf_is_set = (len(tags) == 1 and tags[0].category == 'set')
  75     theme_is_set = len([tag for tag in tags if tag.category == 'theme']) > 0
  76     if theme_is_set:
  77         model = models.Fragment
  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:
  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 },
  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 search(request):
 124     query = request.GET.get('q', '')
 125     tags = request.GET.get('tags', '')
 126     if tags == '':
 127         tags = []
 128
 129     try:
 130         tag_list = models.Tag.get_tag_list(tags)
 131         tag = models.Tag.objects.get(name=query)
 132     except models.Tag.DoesNotExist:
 133         try:
 134             book = models.Book.objects.get(title=query)
 135             return HttpResponseRedirect(book.get_absolute_url())
 136         except models.Book.DoesNotExist:
 137             return HttpResponseRedirect(reverse('catalogue.views.main_page'))
 138     else:
 139         tag_list.append(tag)
 140         return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list',
 141             kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
 142         ))
 143
 144
 145 def tags_starting_with(request):
 146     try:
 147         prefix = request.GET['q']
 148         if len(prefix) < 2:
 149             raise KeyError
 150
 151         books = models.Book.objects.filter(title__icontains=prefix)
 152         tags = models.Tag.objects.filter(name__icontains=prefix)
 153         if request.user.is_authenticated():
 154             tags = tags.filter(~Q(category='set') | Q(user=request.user))
 155         else:
 156             tags = tags.filter(~Q(category='set'))
 157
 158         completions = [book.title for book in books] + [tag.name for tag in tags]
 159
 160         return HttpResponse('\n'.join(completions))
 161
 162     except KeyError:
 163         return HttpResponse('')
 164
 165
 166 # ====================
 167 # = Shelf management =
 168 # ====================
 169 @login_required
 170 @cache.never_cache
 171 def user_shelves(request):
 172     shelves = models.Tag.objects.filter(category='set', user=request.user)
 173     new_set_form = forms.NewSetForm()
 174     return render_to_response('catalogue/user_shelves.html', locals(),
 175             context_instance=RequestContext(request))
 176
 177
 178 @cache.never_cache
 179 def book_sets(request, slug):
 180     book = get_object_or_404(models.Book, slug=slug)
 181     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 182     book_sets = book.tags.filter(category='set', user=request.user)
 183
 184     if not request.user.is_authenticated():
 185         return HttpResponse('<p>Aby zarządzać swoimi półkami, musisz się zalogować.</p>')
 186
 187     if request.method == 'POST':
 188         form = forms.ObjectSetsForm(book, request.user, request.POST)
 189         if form.is_valid():
 190             book.tags = ([models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']] +
 191                 list(book.tags.filter(~Q(category='set') | ~Q(user=request.user))))
 192             if request.is_ajax():
 193                 return HttpResponse('<p>Półki zostały zapisane.</p>')
 194             else:
 195                 return HttpResponseRedirect('/')
 196     else:
 197         form = forms.ObjectSetsForm(book, request.user)
 198         new_set_form = forms.NewSetForm()
 199
 200     return render_to_response('catalogue/book_sets.html', locals(),
 201         context_instance=RequestContext(request))
 202
 203
 204 @cache.cache_control(must_revalidate=True, max_age=1800)
 205 def download_shelf(request, slug):
 206     """"
 207     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 208     without loading the whole file into memory. A similar approach can
 209     be used for large dynamic PDF files.
 210     """
 211     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 212
 213     # Create a ZIP archive
 214     temp = tempfile.TemporaryFile()
 215     archive = zipfile.ZipFile(temp, 'w', zipfile.ZIP_DEFLATED)
 216     for book in models.Book.tagged.with_all(shelf):
 217         if book.pdf_file:
 218             filename = book.pdf_file.path
 219             archive.write(filename, str('%s.pdf' % book.slug))
 220         if book.odt_file:
 221             filename = book.odt_file.path
 222             archive.write(filename, str('%s.odt' % book.slug))
 223         if book.txt_file:
 224             filename = book.txt_file.path
 225             archive.write(filename, str('%s.txt' % book.slug))
 226     archive.close()
 227
 228     # Write file to archive in small chunks
 229     wrapper = FileWrapper(temp)
 230     response = HttpResponse(wrapper, content_type='application/zip')
 231     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 232     response['Content-Length'] = temp.tell()
 233     temp.seek(0)
 234     return response
 235
 236
 237 @login_required
 238 @require_POST
 239 @cache.never_cache
 240 def new_set(request):
 241     new_set_form = forms.NewSetForm(request.POST)
 242     if new_set_form.is_valid():
 243         new_set = new_set_form.save(request.user)
 244
 245         if request.is_ajax():
 246             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
 247         else:
 248             return HttpResponseRedirect('/')
 249
 250     return render_to_response('catalogue/book_sets.html', locals(),
 251             context_instance=RequestContext(request))
 252
 253
 254 @login_required
 255 @require_POST
 256 @cache.never_cache
 257 def delete_shelf(request, slug):
 258     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 259     user_set.delete()
 260
 261     if request.is_ajax():
 262         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
 263     else:
 264         return HttpResponseRedirect('/')
 265
 266
 267 # ==================
 268 # = Authentication =
 269 # ==================
 270 @require_POST
 271 @cache.never_cache
 272 def login(request):
 273     form = AuthenticationForm(data=request.POST, prefix='login')
 274     if form.is_valid():
 275         auth.login(request, form.get_user())
 276         response_data = {'success': True, 'errors': {}}
 277     else:
 278         response_data = {'success': False, 'errors': form.errors}
 279     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 280
 281
 282 @require_POST
 283 @cache.never_cache
 284 def register(request):
 285     registration_form = UserCreationForm(request.POST, prefix='registration')
 286     if registration_form.is_valid():
 287         user = registration_form.save()
 288         user = auth.authenticate(
 289             username=registration_form.cleaned_data['username'],
 290             password=registration_form.cleaned_data['password1']
 291         )
 292         auth.login(request, user)
 293         response_data = {'success': True, 'errors': {}}
 294     else:
 295         response_data = {'success': False, 'errors': registration_form.errors}
 296     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 297
 298
 299 @cache.never_cache
 300 def logout_then_redirect(request):
 301     auth.logout(request)
 302     return HttpResponseRedirect(request.GET.get('next', '/'))
 303