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 or shelf_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
 218     # Collect all books to include in ZIP archive
 219     def collect_books(books):
 220         result = []
 221         for book in books:
 222             if len(book.children.all()) == 0:
 223                 result.append(book)
 224             else:
 225                 result += collect_books(book.children.all())
 226         return result
 227
 228     for book in collect_books(models.Book.tagged.with_all(shelf)):
 229         if book.pdf_file:
 230             filename = book.pdf_file.path
 231             archive.write(filename, str('%s.pdf' % book.slug))
 232         if book.odt_file:
 233             filename = book.odt_file.path
 234             archive.write(filename, str('%s.odt' % book.slug))
 235         if book.txt_file:
 236             filename = book.txt_file.path
 237             archive.write(filename, str('%s.txt' % book.slug))
 238     archive.close()
 239
 240     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 241     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 242     response['Content-Length'] = temp.tell()
 243
 244     temp.seek(0)
 245     response.write(temp.read())
 246     return response
 247
 248
 249 @login_required
 250 @require_POST
 251 @cache.never_cache
 252 def new_set(request):
 253     new_set_form = forms.NewSetForm(request.POST)
 254     if new_set_form.is_valid():
 255         new_set = new_set_form.save(request.user)
 256
 257         if request.is_ajax():
 258             return HttpResponse(u'<p>Półka <strong>%s</strong> została utworzona</p>' % new_set)
 259         else:
 260             return HttpResponseRedirect('/')
 261
 262     return render_to_response('catalogue/book_sets.html', locals(),
 263             context_instance=RequestContext(request))
 264
 265
 266 @login_required
 267 @require_POST
 268 @cache.never_cache
 269 def delete_shelf(request, slug):
 270     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 271     user_set.delete()
 272
 273     if request.is_ajax():
 274         return HttpResponse(u'<p>Półka <strong>%s</strong> została usunięta</p>' % user_set.name)
 275     else:
 276         return HttpResponseRedirect('/')
 277
 278
 279 # ==================
 280 # = Authentication =
 281 # ==================
 282 @require_POST
 283 @cache.never_cache
 284 def login(request):
 285     form = AuthenticationForm(data=request.POST, prefix='login')
 286     if form.is_valid():
 287         auth.login(request, form.get_user())
 288         response_data = {'success': True, 'errors': {}}
 289     else:
 290         response_data = {'success': False, 'errors': form.errors}
 291     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 292
 293
 294 @require_POST
 295 @cache.never_cache
 296 def register(request):
 297     registration_form = UserCreationForm(request.POST, prefix='registration')
 298     if registration_form.is_valid():
 299         user = registration_form.save()
 300         user = auth.authenticate(
 301             username=registration_form.cleaned_data['username'],
 302             password=registration_form.cleaned_data['password1']
 303         )
 304         auth.login(request, user)
 305         response_data = {'success': True, 'errors': {}}
 306     else:
 307         response_data = {'success': False, 'errors': registration_form.errors}
 308     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 309
 310
 311 @cache.never_cache
 312 def logout_then_redirect(request):
 313     auth.logout(request)
 314     return HttpResponseRedirect(request.GET.get('next', '/'))
 315