apps/catalogue/views.py

   1 # -*- coding: utf-8 -*-
   2 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   3 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   4 #
   5 import tempfile
   6 import zipfile
   7 import sys
   8 import pprint
   9 import traceback
  10 import re
  11
  12 from django.conf import settings
  13 from django.template import RequestContext
  14 from django.shortcuts import render_to_response, get_object_or_404
  15 from django.http import HttpResponse, HttpResponseRedirect, Http404
  16 from django.core.urlresolvers import reverse
  17 from django.db.models import Q
  18 from django.contrib.auth.decorators import login_required, user_passes_test
  19 from django.utils.datastructures import SortedDict
  20 from django.views.decorators.http import require_POST
  21 from django.contrib import auth
  22 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  23 from django.utils import simplejson
  24 from django.utils.functional import Promise
  25 from django.utils.encoding import force_unicode
  26 from django.utils.http import urlquote_plus
  27 from django.views.decorators import cache
  28 from django.utils.translation import ugettext as _
  29
  30 from catalogue import models
  31 from catalogue import forms
  32 from catalogue.utils import split_tags
  33 from newtagging import views as newtagging_views
  34
  35
  36 staff_required = user_passes_test(lambda user: user.is_staff)
  37
  38
  39 class LazyEncoder(simplejson.JSONEncoder):
  40     def default(self, obj):
  41         if isinstance(obj, Promise):
  42             return force_unicode(obj)
  43         return obj
  44
  45
  46 def main_page(request):
  47     if request.user.is_authenticated():
  48         shelves = models.Tag.objects.filter(category='set', user=request.user)
  49         new_set_form = forms.NewSetForm()
  50     extra_where = "NOT catalogue_tag.category = 'set'"
  51     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
  52     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
  53         extra={'where': ["catalogue_tag.category = 'theme'"] + [extra_where]})
  54     categories = split_tags(tags)
  55
  56     form = forms.SearchForm()
  57     return render_to_response('catalogue/main_page.html', locals(),
  58         context_instance=RequestContext(request))
  59
  60
  61 def book_list(request):
  62     books = models.Book.objects.all()
  63     form = forms.SearchForm()
  64
  65     books_by_first_letter = SortedDict()
  66     for book in books:
  67         books_by_first_letter.setdefault(book.title[0], []).append(book)
  68
  69     return render_to_response('catalogue/book_list.html', locals(),
  70         context_instance=RequestContext(request))
  71
  72
  73 def tagged_object_list(request, tags=''):
  74     # Prevent DoS attacks on our database
  75     if len(tags.split('/')) > 6:
  76         raise Http404
  77
  78     try:
  79         tags = models.Tag.get_tag_list(tags)
  80     except models.Tag.DoesNotExist:
  81         raise Http404
  82
  83     if len([tag for tag in tags if tag.category == 'book']):
  84         raise Http404
  85
  86     model = models.Book
  87     shelf = [tag for tag in tags if tag.category == 'set']
  88     shelf_is_set = (len(tags) == 1 and tags[0].category == 'set')
  89     theme_is_set = len([tag for tag in tags if tag.category == 'theme']) > 0
  90     if theme_is_set:
  91         model = models.Fragment
  92     only_author = len(tags) == 1 and tags[0].category == 'author'
  93     pd_counter = only_author and tags[0].goes_to_pd()
  94
  95     user_is_owner = (len(shelf) and request.user.is_authenticated() and request.user == shelf[0].user)
  96
  97     extra_where = "catalogue_tag.category NOT IN ('set', 'book')"
  98     related_tags = models.Tag.objects.related_for_model(tags, model, counts=True, extra={'where': [extra_where]})
  99     categories = split_tags(related_tags)
 100
 101     if not (theme_is_set or shelf_is_set):
 102         model=models.Book.objects.filter(parent=None)
 103
 104     return newtagging_views.tagged_object_list(
 105         request,
 106         tag_model=models.Tag,
 107         queryset_or_model=model,
 108         tags=tags,
 109         template_name='catalogue/tagged_object_list.html',
 110         extra_context = {
 111             'categories': categories,
 112             'shelf_is_set': shelf_is_set,
 113             'only_author': only_author,
 114             'pd_counter': pd_counter,
 115             'user_is_owner': user_is_owner,
 116             'formats_form': forms.DownloadFormatsForm(),
 117         },
 118     )
 119
 120
 121 def book_fragments(request, book_slug, theme_slug):
 122     book = get_object_or_404(models.Book, slug=book_slug)
 123     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug)
 124     theme = get_object_or_404(models.Tag, slug=theme_slug)
 125     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 126
 127     form = forms.SearchForm()
 128     return render_to_response('catalogue/book_fragments.html', locals(),
 129         context_instance=RequestContext(request))
 130
 131
 132 def book_detail(request, slug):
 133     try:
 134         book = models.Book.objects.get(slug=slug)
 135     except models.Book.DoesNotExist:
 136         return book_stub_detail(request, slug)
 137
 138     book_tag = get_object_or_404(models.Tag, slug = 'l-' + slug)
 139     tags = list(book.tags.filter(~Q(category='set')))
 140     categories = split_tags(tags)
 141     book_children = book.children.all().order_by('parent_number')
 142     extra_where = "catalogue_tag.category = 'theme'"
 143     book_themes = models.Tag.objects.related_for_model(book_tag, models.Fragment, counts=True, extra={'where': [extra_where]})
 144     extra_info = book.get_extra_info_value()
 145
 146     form = forms.SearchForm()
 147     return render_to_response('catalogue/book_detail.html', locals(),
 148         context_instance=RequestContext(request))
 149
 150
 151 def book_stub_detail(request, slug):
 152     book = get_object_or_404(models.BookStub, slug=slug)
 153     pd_counter = book.pd
 154     form = forms.SearchForm()
 155
 156     return render_to_response('catalogue/book_stub_detail.html', locals(),
 157         context_instance=RequestContext(request))
 158
 159
 160 def book_text(request, slug):
 161     book = get_object_or_404(models.Book, slug=slug)
 162     book_themes = {}
 163     for fragment in book.fragments.all():
 164         for theme in fragment.tags.filter(category='theme'):
 165             book_themes.setdefault(theme, []).append(fragment)
 166
 167     book_themes = book_themes.items()
 168     book_themes.sort(key=lambda s: s[0].sort_key)
 169     return render_to_response('catalogue/book_text.html', locals(),
 170         context_instance=RequestContext(request))
 171
 172
 173 # ==========
 174 # = Search =
 175 # ==========
 176
 177 def _no_diacritics_regexp(query):
 178     """ returns a regexp for searching for a query without diacritics
 179
 180     should be locale-aware """
 181     names = {'a':u'ą', 'c':u'ć', 'e':u'ę', 'l': u'ł', 'n':u'ń', 'o':u'ó', 's':u'ś', 'z':u'ź|ż'}
 182     def repl(m):
 183         l = m.group()
 184         return "(%s|%s)" % (l, names[l])
 185     return re.sub('[%s]'%(''.join(names.keys())), repl, query)
 186
 187 def _word_starts_with(name, prefix):
 188     """returns a Q object getting models having `name` contain a word
 189     starting with `prefix`
 190     """
 191     kwargs = {}
 192     if settings.DATABASE_ENGINE in ('mysql', 'postgresql_psycopg2', 'postgresql'):
 193         prefix = _no_diacritics_regexp(re.escape(prefix))
 194         # we could use a [[:<:]] (word start),
 195         # but we want both `xy` and `(xy` to catch `(xyz)`
 196         kwargs['%s__iregex' % name] = u"(^|[^[:alpha:]])%s" % prefix
 197     else:
 198         # don't know how to do a generic regex
 199         # checking for simple icontain instead
 200         kwargs['%s__icontains' % name] = prefix
 201     return Q(**kwargs)
 202
 203
 204 def _tags_exact_matches(prefix, user):
 205     book_stubs = models.BookStub.objects.filter(title__iexact = prefix)
 206     books = models.Book.objects.filter(title__iexact = prefix)
 207     book_stubs = filter(lambda x: x not in books, book_stubs)
 208     tags = models.Tag.objects.filter(name__iexact = prefix)
 209     if user.is_authenticated():
 210         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 211     else:
 212         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 213
 214     return list(books) + list(tags) + list(book_stubs)
 215
 216
 217 def _tags_starting_with(prefix, user):
 218     book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
 219     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 220     book_stubs = filter(lambda x: x not in books, book_stubs)
 221     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 222     if user.is_authenticated():
 223         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 224     else:
 225         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 226
 227     return list(books) + list(tags) + list(book_stubs)
 228
 229
 230
 231 def _get_result_link(match, tag_list):
 232     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 233         return match.get_absolute_url()
 234     else:
 235         return reverse('catalogue.views.tagged_object_list',
 236             kwargs={'tags': '/'.join(tag.slug for tag in tag_list + [match])}
 237         )
 238
 239 def _get_result_type(match):
 240     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 241         type = 'book'
 242     else:
 243         type = match.category
 244     return dict(models.TAG_CATEGORIES)[type]
 245
 246
 247
 248 def search(request):
 249     tags = request.GET.get('tags', '')
 250     prefix = request.GET.get('q', '')
 251
 252     try:
 253         tag_list = models.Tag.get_tag_list(tags)
 254     except:
 255         tag_list = []
 256
 257     # Prefix must have at least 2 characters
 258     if len(prefix) < 2:
 259         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 260             context_instance=RequestContext(request))
 261
 262     result = _tags_exact_matches(prefix, request.user)
 263
 264     if len(result) > 1:
 265         # multiple exact matches
 266         return render_to_response('catalogue/search_multiple_hits.html',
 267             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 268             context_instance=RequestContext(request))
 269
 270     if not result:
 271         # no exact matches
 272         result = _tags_starting_with(prefix, request.user)
 273
 274     if result:
 275         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 276     else:
 277         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 278             context_instance=RequestContext(request))
 279
 280
 281 def tags_starting_with(request):
 282     prefix = request.GET.get('q', '')
 283     # Prefix must have at least 2 characters
 284     if len(prefix) < 2:
 285         return HttpResponse('')
 286
 287     return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
 288
 289
 290 # ====================
 291 # = Shelf management =
 292 # ====================
 293 @login_required
 294 @cache.never_cache
 295 def user_shelves(request):
 296     shelves = models.Tag.objects.filter(category='set', user=request.user)
 297     new_set_form = forms.NewSetForm()
 298     return render_to_response('catalogue/user_shelves.html', locals(),
 299             context_instance=RequestContext(request))
 300
 301 @cache.never_cache
 302 def book_sets(request, slug):
 303     book = get_object_or_404(models.Book, slug=slug)
 304     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 305     book_sets = book.tags.filter(category='set', user=request.user)
 306
 307     if not request.user.is_authenticated():
 308         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 309
 310     if request.method == 'POST':
 311         form = forms.ObjectSetsForm(book, request.user, request.POST)
 312         if form.is_valid():
 313             old_shelves = list(book.tags.filter(category='set'))
 314             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 315
 316             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 317                 shelf.book_count -= 1
 318                 shelf.save()
 319
 320             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 321                 shelf.book_count += 1
 322                 shelf.save()
 323
 324             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 325             if request.is_ajax():
 326                 return HttpResponse(_('<p>Shelves were sucessfully saved.</p>'))
 327             else:
 328                 return HttpResponseRedirect('/')
 329     else:
 330         form = forms.ObjectSetsForm(book, request.user)
 331         new_set_form = forms.NewSetForm()
 332
 333     return render_to_response('catalogue/book_sets.html', locals(),
 334         context_instance=RequestContext(request))
 335
 336
 337 @login_required
 338 @require_POST
 339 @cache.never_cache
 340 def remove_from_shelf(request, shelf, book):
 341     book = get_object_or_404(models.Book, slug=book)
 342     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 343
 344     if shelf in book.tags:
 345         models.Tag.objects.remove_tag(book, shelf)
 346
 347         shelf.book_count -= 1
 348         shelf.save()
 349
 350         return HttpResponse(_('Book was successfully removed from the shelf'))
 351     else:
 352         return HttpResponse(_('This book is not on the shelf'))
 353
 354
 355 def collect_books(books):
 356     """
 357     Returns all real books in collection.
 358     """
 359     result = []
 360     for book in books:
 361         if len(book.children.all()) == 0:
 362             result.append(book)
 363         else:
 364             result += collect_books(book.children.all())
 365     return result
 366
 367
 368 @cache.never_cache
 369 def download_shelf(request, slug):
 370     """"
 371     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 372     without loading the whole file into memory. A similar approach can
 373     be used for large dynamic PDF files.
 374     """
 375     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 376
 377     formats = []
 378     form = forms.DownloadFormatsForm(request.GET)
 379     if form.is_valid():
 380         formats = form.cleaned_data['formats']
 381     if len(formats) == 0:
 382         formats = ['pdf', 'odt', 'txt', 'mp3', 'ogg']
 383
 384     # Create a ZIP archive
 385     temp = tempfile.TemporaryFile()
 386     archive = zipfile.ZipFile(temp, 'w')
 387
 388     for book in collect_books(models.Book.tagged.with_all(shelf)):
 389         if 'pdf' in formats and book.pdf_file:
 390             filename = book.pdf_file.path
 391             archive.write(filename, str('%s.pdf' % book.slug))
 392         if 'odt' in formats and book.odt_file:
 393             filename = book.odt_file.path
 394             archive.write(filename, str('%s.odt' % book.slug))
 395         if 'txt' in formats and book.txt_file:
 396             filename = book.txt_file.path
 397             archive.write(filename, str('%s.txt' % book.slug))
 398         if 'mp3' in formats and book.mp3_file:
 399             filename = book.mp3_file.path
 400             archive.write(filename, str('%s.mp3' % book.slug))
 401         if 'ogg' in formats and book.ogg_file:
 402             filename = book.ogg_file.path
 403             archive.write(filename, str('%s.ogg' % book.slug))
 404     archive.close()
 405
 406     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 407     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 408     response['Content-Length'] = temp.tell()
 409
 410     temp.seek(0)
 411     response.write(temp.read())
 412     return response
 413
 414
 415 @cache.never_cache
 416 def shelf_book_formats(request, shelf):
 417     """"
 418     Returns a list of formats of books in shelf.
 419     """
 420     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 421
 422     formats = {'pdf': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False}
 423
 424     for book in collect_books(models.Book.tagged.with_all(shelf)):
 425         if book.pdf_file:
 426             formats['pdf'] = True
 427         if book.odt_file:
 428             formats['odt'] = True
 429         if book.txt_file:
 430             formats['txt'] = True
 431         if book.mp3_file:
 432             formats['mp3'] = True
 433         if book.ogg_file:
 434             formats['ogg'] = True
 435
 436     return HttpResponse(LazyEncoder().encode(formats))
 437
 438
 439 @login_required
 440 @require_POST
 441 @cache.never_cache
 442 def new_set(request):
 443     new_set_form = forms.NewSetForm(request.POST)
 444     if new_set_form.is_valid():
 445         new_set = new_set_form.save(request.user)
 446
 447         if request.is_ajax():
 448             return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully created</p>') % new_set)
 449         else:
 450             return HttpResponseRedirect('/')
 451
 452     return HttpResponseRedirect('/')
 453
 454
 455 @login_required
 456 @require_POST
 457 @cache.never_cache
 458 def delete_shelf(request, slug):
 459     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 460     user_set.delete()
 461
 462     if request.is_ajax():
 463         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 464     else:
 465         return HttpResponseRedirect('/')
 466
 467
 468 # ==================
 469 # = Authentication =
 470 # ==================
 471 @require_POST
 472 @cache.never_cache
 473 def login(request):
 474     form = AuthenticationForm(data=request.POST, prefix='login')
 475     if form.is_valid():
 476         auth.login(request, form.get_user())
 477         response_data = {'success': True, 'errors': {}}
 478     else:
 479         response_data = {'success': False, 'errors': form.errors}
 480     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 481
 482
 483 @require_POST
 484 @cache.never_cache
 485 def register(request):
 486     registration_form = UserCreationForm(request.POST, prefix='registration')
 487     if registration_form.is_valid():
 488         user = registration_form.save()
 489         user = auth.authenticate(
 490             username=registration_form.cleaned_data['username'],
 491             password=registration_form.cleaned_data['password1']
 492         )
 493         auth.login(request, user)
 494         response_data = {'success': True, 'errors': {}}
 495     else:
 496         response_data = {'success': False, 'errors': registration_form.errors}
 497     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 498
 499
 500 @cache.never_cache
 501 def logout_then_redirect(request):
 502     auth.logout(request)
 503     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 504
 505
 506
 507 # =========
 508 # = Admin =
 509 # =========
 510 @login_required
 511 @staff_required
 512 def import_book(request):
 513     """docstring for import_book"""
 514     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 515     if book_import_form.is_valid():
 516         try:
 517             book_import_form.save()
 518         except:
 519             info = sys.exc_info()
 520             exception = pprint.pformat(info[1])
 521             tb = '\n'.join(traceback.format_tb(info[2]))
 522             _('Today is %(month)s, %(day)s.') % {'month': m, 'day': d}
 523             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 524         return HttpResponse(_("Book imported successfully"))
 525     else:
 526         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 527
 528
 529
 530 def clock(request):
 531     """ Provides server time for jquery.countdown,
 532     in a format suitable for Date.parse()
 533     """
 534     from datetime import datetime
 535     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))