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 search(request):
 123     query = request.GET.get('q', '')
 124     tags = request.GET.get('tags', '')
 125     if tags == '':
 126         tags = []
 127
 128     try:
 129         tag_list = models.Tag.get_tag_list(tags)
 130         tag = models.Tag.objects.get(name=query)
 131     except models.Tag.DoesNotExist:
 132         try:
 133             book = models.Book.objects.get(title=query)
 134             return HttpResponseRedirect(book.get_absolute_url())
 135         except models.Book.DoesNotExist:
 136             return HttpResponseRedirect(reverse('catalogue.views.main_page'))
 137     else:
 138         tag_list.append(tag)
 139         return HttpResponseRedirect(reverse('catalogue.views.tagged_object_list',
 140             kwargs={'tags': '/'.join(tag.slug for tag in tag_list)}
 141         ))
 142
 143
 144 def tags_starting_with(request):
 145     try:
 146         prefix = request.GET['q']
 147         if len(prefix) < 2:
 148             raise KeyError
 149
 150         books = models.Book.objects.filter(title__icontains=prefix)
 151         tags = models.Tag.objects.filter(name__icontains=prefix)
 152         if request.user.is_authenticated():
 153             tags = tags.filter(~Q(category='set') | Q(user=request.user))
 154         else:
 155             tags = tags.filter(~Q(category='set'))
 156
 157         completions = [book.title for book in books] + [tag.name for tag in tags]
 158
 159         return HttpResponse('\n'.join(completions))
 160
 161     except KeyError:
 162         return HttpResponse('')
 163
 164
 165 # ====================
 166 # = Shelf management =
 167 # ====================
 168 @login_required
 169 @cache.never_cache
 170 def user_shelves(request):
 171     shelves = models.Tag.objects.filter(category='set', user=request.user)
 172     new_set_form = forms.NewSetForm()
 173     return render_to_response('catalogue/user_shelves.html', locals(),
 174             context_instance=RequestContext(request))
 175
 176
 177 @cache.never_cache
 178 def book_sets(request, slug):
 179     book = get_object_or_404(models.Book, slug=slug)
 180     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 181     book_sets = book.tags.filter(category='set', user=request.user)
 182
 183     if not request.user.is_authenticated():
 184         return HttpResponse('<p>Aby zarządzać swoimi półkami, musisz się zalogować.</p>')
 185
 186     if request.method == 'POST':
 187         form = forms.ObjectSetsForm(book, request.user, request.POST)
 188         if form.is_valid():
 189             book.tags = ([models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']] +
 190                 list(book.tags.filter(~Q(category='set') | ~Q(user=request.user))))
 191             if request.is_ajax():
 192                 return HttpResponse('<p>Półki zostały zapisane.</p>')
 193             else:
 194                 return HttpResponseRedirect('/')
 195     else:
 196         form = forms.ObjectSetsForm(book, request.user)
 197         new_set_form = forms.NewSetForm()
 198
 199     return render_to_response('catalogue/book_sets.html', locals(),
 200         context_instance=RequestContext(request))
 201
 202
 203 @cache.never_cache
 204 def download_shelf(request, slug):
 205     """"
 206     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 207     without loading the whole file into memory. A similar approach can
 208     be used for large dynamic PDF files.
 209     """
 210     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 211
 212     # Create a ZIP archive
 213     temp = temp = tempfile.TemporaryFile()
 214     archive = zipfile.ZipFile(temp, 'w')
 215     for book in models.Book.tagged.with_all(shelf):
 216         if book.pdf_file:
 217             filename = book.pdf_file.path
 218             archive.write(filename, str('%s.pdf' % book.slug))
 219         if book.odt_file:
 220             filename = book.odt_file.path
 221             archive.write(filename, str('%s.odt' % book.slug))
 222         if book.txt_file:
 223             filename = book.txt_file.path
 224             archive.write(filename, str('%s.txt' % book.slug))
 225     archive.close()
 226
 227     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 228     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 229     response['Content-Length'] = temp.tell()
 230
 231     temp.seek(0)
 232     response.write(temp.read())
 233     return response
 234
 235
 236 @login_required
 237 @require_POST
 238 @cache.never_cache
 239 def new_set(request):
 240     new_set_form = forms.NewSetForm(request.POST)
 241     if new_set_form.is_valid():
 242         new_set = new_set_form.save(request.user)
 243
 244         if request.is_ajax():
 245             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
 246         else:
 247             return HttpResponseRedirect('/')
 248
 249     return render_to_response('catalogue/book_sets.html', locals(),
 250             context_instance=RequestContext(request))
 251
 252
 253 @login_required
 254 @require_POST
 255 @cache.never_cache
 256 def delete_shelf(request, slug):
 257     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 258     user_set.delete()
 259
 260     if request.is_ajax():
 261         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
 262     else:
 263         return HttpResponseRedirect('/')
 264
 265
 266 # ==================
 267 # = Authentication =
 268 # ==================
 269 @require_POST
 270 @cache.never_cache
 271 def login(request):
 272     form = AuthenticationForm(data=request.POST, prefix='login')
 273     if form.is_valid():
 274         auth.login(request, form.get_user())
 275         response_data = {'success': True, 'errors': {}}
 276     else:
 277         response_data = {'success': False, 'errors': form.errors}
 278     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 279
 280
 281 @require_POST
 282 @cache.never_cache
 283 def register(request):
 284     registration_form = UserCreationForm(request.POST, prefix='registration')
 285     if registration_form.is_valid():
 286         user = registration_form.save()
 287         user = auth.authenticate(
 288             username=registration_form.cleaned_data['username'],
 289             password=registration_form.cleaned_data['password1']
 290         )
 291         auth.login(request, user)
 292         response_data = {'success': True, 'errors': {}}
 293     else:
 294         response_data = {'success': False, 'errors': registration_form.errors}
 295     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 296
 297
 298 @cache.never_cache
 299 def logout_then_redirect(request):
 300     auth.logout(request)
 301     return HttpResponseRedirect(request.GET.get('next', '/'))
 302