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 import itertools
  12 from operator import itemgetter
  13
  14 from django.conf import settings
  15 from django.template import RequestContext
  16 from django.shortcuts import render_to_response, get_object_or_404
  17 from django.http import HttpResponse, HttpResponseRedirect, Http404
  18 from django.core.urlresolvers import reverse
  19 from django.db.models import Q
  20 from django.contrib.auth.decorators import login_required, user_passes_test
  21 from django.utils.datastructures import SortedDict
  22 from django.views.decorators.http import require_POST
  23 from django.contrib import auth
  24 from django.contrib.auth.forms import UserCreationForm, AuthenticationForm
  25 from django.utils import simplejson
  26 from django.utils.functional import Promise
  27 from django.utils.encoding import force_unicode
  28 from django.utils.http import urlquote_plus
  29 from django.views.decorators import cache
  30 from django.utils.translation import ugettext as _
  31 from django.views.generic.list_detail import object_list
  32
  33 from catalogue import models
  34 from catalogue import forms
  35 from catalogue.utils import split_tags
  36 from newtagging import views as newtagging_views
  37
  38
  39 staff_required = user_passes_test(lambda user: user.is_staff)
  40
  41
  42 class LazyEncoder(simplejson.JSONEncoder):
  43     def default(self, obj):
  44         if isinstance(obj, Promise):
  45             return force_unicode(obj)
  46         return obj
  47
  48
  49 def main_page(request):
  50     if request.user.is_authenticated():
  51         shelves = models.Tag.objects.filter(category='set', user=request.user)
  52         new_set_form = forms.NewSetForm()
  53     extra_where = "NOT catalogue_tag.category = 'set'"
  54     tags = models.Tag.objects.usage_for_model(models.Book, counts=True, extra={'where': [extra_where]})
  55     fragment_tags = models.Tag.objects.usage_for_model(models.Fragment, counts=True,
  56         extra={'where': ["catalogue_tag.category = 'theme'"] + [extra_where]})
  57     categories = split_tags(tags)
  58
  59     form = forms.SearchForm()
  60     return render_to_response('catalogue/main_page.html', locals(),
  61         context_instance=RequestContext(request))
  62
  63
  64 def book_list(request):
  65     books = models.Book.objects.all()
  66     form = forms.SearchForm()
  67
  68     books_by_first_letter = SortedDict()
  69     for book in books:
  70         books_by_first_letter.setdefault(book.title[0], []).append(book)
  71
  72     return render_to_response('catalogue/book_list.html', locals(),
  73         context_instance=RequestContext(request))
  74
  75
  76 def differentiate_tags(request, tags, ambiguous_slugs):
  77     beginning = '/'.join(tag.url_chunk for tag in tags)
  78     unparsed = '/'.join(ambiguous_slugs[1:])
  79     options = []
  80     for tag in models.Tag.objects.exclude(category='book').filter(slug=ambiguous_slugs[0]):
  81         options.append({
  82             'url_args': '/'.join((beginning, tag.url_chunk, unparsed)).strip('/'),
  83             'tags': [tag]
  84         })
  85     return render_to_response('catalogue/differentiate_tags.html',
  86                 {'tags': tags, 'options': options, 'unparsed': ambiguous_slugs[1:]},
  87                 context_instance=RequestContext(request))
  88
  89
  90 def tagged_object_list(request, tags=''):
  91     try:
  92         tags = models.Tag.get_tag_list(tags)
  93     except models.Tag.DoesNotExist:
  94         raise Http404
  95     except models.Tag.MultipleObjectsReturned, e:
  96         return differentiate_tags(request, e.tags, e.ambiguous_slugs)
  97
  98     try:
  99         if len(tags) > settings.MAX_TAG_LIST:
 100             raise Http404
 101     except AttributeError:
 102         pass
 103
 104     if len([tag for tag in tags if tag.category == 'book']):
 105         raise Http404
 106
 107     theme_is_set = [tag for tag in tags if tag.category == 'theme']
 108     shelf_is_set = [tag for tag in tags if tag.category == 'set']
 109     only_shelf = shelf_is_set and len(tags) == 1
 110     only_my_shelf = only_shelf and request.user.is_authenticated() and request.user == tags[0].user
 111
 112     objects = only_author = pd_counter = None
 113     categories = {}
 114
 115     if theme_is_set:
 116         shelf_tags = [tag for tag in tags if tag.category == 'set']
 117         fragment_tags = [tag for tag in tags if tag.category != 'set']
 118         fragments = models.Fragment.tagged.with_all(fragment_tags)
 119
 120         if shelf_tags:
 121             books = models.Book.tagged.with_all(shelf_tags).order_by()
 122             l_tags = [book.book_tag() for book in books]
 123             fragments = models.Fragment.tagged.with_any(l_tags, fragments)
 124
 125         # newtagging goes crazy if we just try:
 126         #related_tags = models.Tag.objects.usage_for_queryset(fragments, counts=True,
 127         #                    extra={'where': ["catalogue_tag.category != 'book'"]})
 128         fragment_keys = [fragment.pk for fragment in fragments]
 129         if fragment_keys:
 130             related_tags = models.Fragment.tags.usage(counts=True,
 131                                 filters={'pk__in': fragment_keys},
 132                                 extra={'where': ["catalogue_tag.category != 'book'"]})
 133             related_tags = (tag for tag in related_tags if tag not in fragment_tags)
 134             categories = split_tags(related_tags)
 135
 136             objects = fragments
 137     else:
 138         # get relevant books and their tags
 139         objects = models.Book.tagged.with_all(tags).order_by()
 140         if not shelf_is_set:
 141             # eliminate descendants
 142             l_tags = [book.book_tag() for book in objects]
 143             descendants_keys = [book.pk for book in models.Book.tagged.with_any(l_tags)]
 144             if descendants_keys:
 145                 objects = objects.exclude(pk__in=descendants_keys)
 146
 147         # get related tags from `tag_counter` and `theme_counter`
 148         related_counts = {}
 149         tags_pks = [tag.pk for tag in tags]
 150         for book in objects:
 151             for tag_pk, value in itertools.chain(book.tag_counter.iteritems(), book.theme_counter.iteritems()):
 152                 if tag_pk in tags_pks:
 153                     continue
 154                 related_counts[tag_pk] = related_counts.get(tag_pk, 0) + value
 155         related_tags = models.Tag.objects.filter(pk__in=related_counts.keys())
 156         related_tags = [tag for tag in related_tags if tag not in tags]
 157         for tag in related_tags:
 158             tag.count = related_counts[tag.pk]
 159
 160         categories = split_tags(related_tags)
 161         del related_tags
 162
 163     if not objects:
 164         only_author = len(tags) == 1 and tags[0].category == 'author'
 165         pd_counter = only_author and tags[0].goes_to_pd()
 166         objects = models.Book.objects.none()
 167
 168     return object_list(
 169         request,
 170         objects,
 171         template_name='catalogue/tagged_object_list.html',
 172         extra_context={
 173             'categories': categories,
 174             'only_shelf': only_shelf,
 175             'only_author': only_author,
 176             'pd_counter': pd_counter,
 177             'only_my_shelf': only_my_shelf,
 178             'formats_form': forms.DownloadFormatsForm(),
 179
 180             'tags': tags,
 181         }
 182     )
 183
 184
 185 def book_fragments(request, book_slug, theme_slug):
 186     book = get_object_or_404(models.Book, slug=book_slug)
 187     book_tag = get_object_or_404(models.Tag, slug='l-' + book_slug, category='book')
 188     theme = get_object_or_404(models.Tag, slug=theme_slug, category='theme')
 189     fragments = models.Fragment.tagged.with_all([book_tag, theme])
 190
 191     form = forms.SearchForm()
 192     return render_to_response('catalogue/book_fragments.html', locals(),
 193         context_instance=RequestContext(request))
 194
 195
 196 def book_detail(request, slug):
 197     try:
 198         book = models.Book.objects.get(slug=slug)
 199     except models.Book.DoesNotExist:
 200         return book_stub_detail(request, slug)
 201
 202     book_tag = book.book_tag()
 203     tags = list(book.tags.filter(~Q(category='set')))
 204     categories = split_tags(tags)
 205     book_children = book.children.all().order_by('parent_number')
 206     extra_where = "catalogue_tag.category = 'theme'"
 207     book_themes = models.Tag.objects.related_for_model(book_tag, models.Fragment, counts=True, extra={'where': [extra_where]})
 208     extra_info = book.get_extra_info_value()
 209
 210     form = forms.SearchForm()
 211     return render_to_response('catalogue/book_detail.html', locals(),
 212         context_instance=RequestContext(request))
 213
 214
 215 def book_stub_detail(request, slug):
 216     book = get_object_or_404(models.BookStub, slug=slug)
 217     pd_counter = book.pd
 218     form = forms.SearchForm()
 219
 220     return render_to_response('catalogue/book_stub_detail.html', locals(),
 221         context_instance=RequestContext(request))
 222
 223
 224 def book_text(request, slug):
 225     book = get_object_or_404(models.Book, slug=slug)
 226     book_themes = {}
 227     for fragment in book.fragments.all():
 228         for theme in fragment.tags.filter(category='theme'):
 229             book_themes.setdefault(theme, []).append(fragment)
 230
 231     book_themes = book_themes.items()
 232     book_themes.sort(key=lambda s: s[0].sort_key)
 233     return render_to_response('catalogue/book_text.html', locals(),
 234         context_instance=RequestContext(request))
 235
 236
 237 # ==========
 238 # = Search =
 239 # ==========
 240
 241 def _no_diacritics_regexp(query):
 242     """ returns a regexp for searching for a query without diacritics
 243
 244     should be locale-aware """
 245     names = {
 246         u'a':u'aąĄ', u'c':u'cćĆ', u'e':u'eęĘ', u'l': u'lłŁ', u'n':u'nńŃ', u'o':u'oóÓ', u's':u'sśŚ', u'z':u'zźżŹŻ',
 247         u'ą':u'ąĄ', u'ć':u'ćĆ', u'ę':u'ęĘ', u'ł': u'łŁ', u'ń':u'ńŃ', u'ó':u'óÓ', u'ś':u'śŚ', u'ź':u'źŹ', u'ż':u'żŻ'
 248         }
 249     def repl(m):
 250         l = m.group()
 251         return u"(%s)" % '|'.join(names[l])
 252     return re.sub(u'[%s]' % (u''.join(names.keys())), repl, query)
 253
 254 def unicode_re_escape(query):
 255     """ Unicode-friendly version of re.escape """
 256     return re.sub('(?u)(\W)', r'\\\1', query)
 257
 258 def _word_starts_with(name, prefix):
 259     """returns a Q object getting models having `name` contain a word
 260     starting with `prefix`
 261
 262     We define word characters as alphanumeric and underscore, like in JS.
 263
 264     Works for MySQL, PostgreSQL, Oracle.
 265     For SQLite, _sqlite* version is substituted for this.
 266     """
 267     kwargs = {}
 268
 269     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 270     # can't use [[:<:]] (word start),
 271     # but we want both `xy` and `(xy` to catch `(xyz)`
 272     kwargs['%s__iregex' % name] = u"(^|[^[:alnum:]_])%s" % prefix
 273
 274     return Q(**kwargs)
 275
 276
 277 def _sqlite_word_starts_with(name, prefix):
 278     """ version of _word_starts_with for SQLite
 279
 280     SQLite in Django uses Python re module
 281     """
 282     kwargs = {}
 283     prefix = _no_diacritics_regexp(unicode_re_escape(prefix))
 284     kwargs['%s__iregex' % name] = ur"(^|(?<=[^\wąćęłńóśźżĄĆĘŁŃÓŚŹŻ]))%s" % prefix
 285     return Q(**kwargs)
 286
 287
 288 if settings.DATABASE_ENGINE == 'sqlite3':
 289     _word_starts_with = _sqlite_word_starts_with
 290
 291
 292 def _tags_starting_with(prefix, user=None):
 293     prefix = prefix.lower()
 294     book_stubs = models.BookStub.objects.filter(_word_starts_with('title', prefix))
 295     books = models.Book.objects.filter(_word_starts_with('title', prefix))
 296     book_stubs = filter(lambda x: x not in books, book_stubs)
 297     tags = models.Tag.objects.filter(_word_starts_with('name', prefix))
 298     if user and user.is_authenticated():
 299         tags = tags.filter(~Q(category='book') & (~Q(category='set') | Q(user=user)))
 300     else:
 301         tags = tags.filter(~Q(category='book') & ~Q(category='set'))
 302
 303     return list(books) + list(tags) + list(book_stubs)
 304
 305
 306 def _get_result_link(match, tag_list):
 307     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 308         return match.get_absolute_url()
 309     else:
 310         return reverse('catalogue.views.tagged_object_list',
 311             kwargs={'tags': '/'.join(tag.url_chunk for tag in tag_list + [match])}
 312         )
 313
 314 def _get_result_type(match):
 315     if isinstance(match, models.Book) or isinstance(match, models.BookStub):
 316         type = 'book'
 317     else:
 318         type = match.category
 319     return dict(models.TAG_CATEGORIES)[type]
 320
 321
 322
 323 def find_best_matches(query, user=None):
 324     """ Finds a Book, Tag or Bookstub best matching a query.
 325
 326     Returns a with:
 327       - zero elements when nothing is found,
 328       - one element when a best result is found,
 329       - more then one element on multiple exact matches
 330
 331     Raises a ValueError on too short a query.
 332     """
 333
 334     query = query.lower()
 335     if len(query) < 2:
 336         raise ValueError("query must have at least two characters")
 337
 338     result = tuple(_tags_starting_with(query, user))
 339     exact_matches = tuple(res for res in result if res.name.lower() == query)
 340     if exact_matches:
 341         return exact_matches
 342     else:
 343         return result[:1]
 344
 345
 346 def search(request):
 347     tags = request.GET.get('tags', '')
 348     prefix = request.GET.get('q', '')
 349
 350     try:
 351         tag_list = models.Tag.get_tag_list(tags)
 352     except:
 353         tag_list = []
 354
 355     try:
 356         result = find_best_matches(prefix, request.user)
 357     except ValueError:
 358         return render_to_response('catalogue/search_too_short.html', {'tags':tag_list, 'prefix':prefix},
 359             context_instance=RequestContext(request))
 360
 361     if len(result) == 1:
 362         return HttpResponseRedirect(_get_result_link(result[0], tag_list))
 363     elif len(result) > 1:
 364         return render_to_response('catalogue/search_multiple_hits.html',
 365             {'tags':tag_list, 'prefix':prefix, 'results':((x, _get_result_link(x, tag_list), _get_result_type(x)) for x in result)},
 366             context_instance=RequestContext(request))
 367     else:
 368         return render_to_response('catalogue/search_no_hits.html', {'tags':tag_list, 'prefix':prefix},
 369             context_instance=RequestContext(request))
 370
 371
 372 def tags_starting_with(request):
 373     prefix = request.GET.get('q', '')
 374     # Prefix must have at least 2 characters
 375     if len(prefix) < 2:
 376         return HttpResponse('')
 377
 378     return HttpResponse('\n'.join(tag.name for tag in _tags_starting_with(prefix, request.user)))
 379
 380 # ====================
 381 # = Shelf management =
 382 # ====================
 383 @login_required
 384 @cache.never_cache
 385 def user_shelves(request):
 386     shelves = models.Tag.objects.filter(category='set', user=request.user)
 387     new_set_form = forms.NewSetForm()
 388     return render_to_response('catalogue/user_shelves.html', locals(),
 389             context_instance=RequestContext(request))
 390
 391 @cache.never_cache
 392 def book_sets(request, slug):
 393     book = get_object_or_404(models.Book, slug=slug)
 394     user_sets = models.Tag.objects.filter(category='set', user=request.user)
 395     book_sets = book.tags.filter(category='set', user=request.user)
 396
 397     if not request.user.is_authenticated():
 398         return HttpResponse(_('<p>To maintain your shelves you need to be logged in.</p>'))
 399
 400     if request.method == 'POST':
 401         form = forms.ObjectSetsForm(book, request.user, request.POST)
 402         if form.is_valid():
 403             old_shelves = list(book.tags.filter(category='set'))
 404             new_shelves = [models.Tag.objects.get(pk=id) for id in form.cleaned_data['set_ids']]
 405
 406             for shelf in [shelf for shelf in old_shelves if shelf not in new_shelves]:
 407                 shelf.book_count -= 1
 408                 shelf.save()
 409
 410             for shelf in [shelf for shelf in new_shelves if shelf not in old_shelves]:
 411                 shelf.book_count += 1
 412                 shelf.save()
 413
 414             book.tags = new_shelves + list(book.tags.filter(~Q(category='set') | ~Q(user=request.user)))
 415             if request.is_ajax():
 416                 return HttpResponse(_('<p>Shelves were sucessfully saved.</p>'))
 417             else:
 418                 return HttpResponseRedirect('/')
 419     else:
 420         form = forms.ObjectSetsForm(book, request.user)
 421         new_set_form = forms.NewSetForm()
 422
 423     return render_to_response('catalogue/book_sets.html', locals(),
 424         context_instance=RequestContext(request))
 425
 426
 427 @login_required
 428 @require_POST
 429 @cache.never_cache
 430 def remove_from_shelf(request, shelf, book):
 431     book = get_object_or_404(models.Book, slug=book)
 432     shelf = get_object_or_404(models.Tag, slug=shelf, category='set', user=request.user)
 433
 434     if shelf in book.tags:
 435         models.Tag.objects.remove_tag(book, shelf)
 436
 437         shelf.book_count -= 1
 438         shelf.save()
 439
 440         return HttpResponse(_('Book was successfully removed from the shelf'))
 441     else:
 442         return HttpResponse(_('This book is not on the shelf'))
 443
 444
 445 def collect_books(books):
 446     """
 447     Returns all real books in collection.
 448     """
 449     result = []
 450     for book in books:
 451         if len(book.children.all()) == 0:
 452             result.append(book)
 453         else:
 454             result += collect_books(book.children.all())
 455     return result
 456
 457
 458 @cache.never_cache
 459 def download_shelf(request, slug):
 460     """"
 461     Create a ZIP archive on disk and transmit it in chunks of 8KB,
 462     without loading the whole file into memory. A similar approach can
 463     be used for large dynamic PDF files.
 464     """
 465     shelf = get_object_or_404(models.Tag, slug=slug, category='set')
 466
 467     formats = []
 468     form = forms.DownloadFormatsForm(request.GET)
 469     if form.is_valid():
 470         formats = form.cleaned_data['formats']
 471     if len(formats) == 0:
 472         formats = ['pdf', 'epub', 'odt', 'txt', 'mp3', 'ogg']
 473
 474     # Create a ZIP archive
 475     temp = tempfile.TemporaryFile()
 476     archive = zipfile.ZipFile(temp, 'w')
 477
 478     for book in collect_books(models.Book.tagged.with_all(shelf)):
 479         if 'pdf' in formats and book.pdf_file:
 480             filename = book.pdf_file.path
 481             archive.write(filename, str('%s.pdf' % book.slug))
 482         if 'epub' in formats and book.epub_file:
 483             filename = book.epub_file.path
 484             archive.write(filename, str('%s.epub' % book.slug))
 485         if 'odt' in formats and book.odt_file:
 486             filename = book.odt_file.path
 487             archive.write(filename, str('%s.odt' % book.slug))
 488         if 'txt' in formats and book.txt_file:
 489             filename = book.txt_file.path
 490             archive.write(filename, str('%s.txt' % book.slug))
 491         if 'mp3' in formats and book.mp3_file:
 492             filename = book.mp3_file.path
 493             archive.write(filename, str('%s.mp3' % book.slug))
 494         if 'ogg' in formats and book.ogg_file:
 495             filename = book.ogg_file.path
 496             archive.write(filename, str('%s.ogg' % book.slug))
 497     archive.close()
 498
 499     response = HttpResponse(content_type='application/zip', mimetype='application/x-zip-compressed')
 500     response['Content-Disposition'] = 'attachment; filename=%s.zip' % shelf.sort_key
 501     response['Content-Length'] = temp.tell()
 502
 503     temp.seek(0)
 504     response.write(temp.read())
 505     return response
 506
 507
 508 @cache.never_cache
 509 def shelf_book_formats(request, shelf):
 510     """"
 511     Returns a list of formats of books in shelf.
 512     """
 513     shelf = get_object_or_404(models.Tag, slug=shelf, category='set')
 514
 515     formats = {'pdf': False, 'epub': False, 'odt': False, 'txt': False, 'mp3': False, 'ogg': False}
 516
 517     for book in collect_books(models.Book.tagged.with_all(shelf)):
 518         if book.pdf_file:
 519             formats['pdf'] = True
 520         if book.epub_file:
 521             formats['epub'] = True
 522         if book.odt_file:
 523             formats['odt'] = True
 524         if book.txt_file:
 525             formats['txt'] = True
 526         if book.mp3_file:
 527             formats['mp3'] = True
 528         if book.ogg_file:
 529             formats['ogg'] = True
 530
 531     return HttpResponse(LazyEncoder().encode(formats))
 532
 533
 534 @login_required
 535 @require_POST
 536 @cache.never_cache
 537 def new_set(request):
 538     new_set_form = forms.NewSetForm(request.POST)
 539     if new_set_form.is_valid():
 540         new_set = new_set_form.save(request.user)
 541
 542         if request.is_ajax():
 543             return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully created</p>') % new_set)
 544         else:
 545             return HttpResponseRedirect('/')
 546
 547     return HttpResponseRedirect('/')
 548
 549
 550 @login_required
 551 @require_POST
 552 @cache.never_cache
 553 def delete_shelf(request, slug):
 554     user_set = get_object_or_404(models.Tag, slug=slug, category='set', user=request.user)
 555     user_set.delete()
 556
 557     if request.is_ajax():
 558         return HttpResponse(_('<p>Shelf <strong>%s</strong> was successfully removed</p>') % user_set.name)
 559     else:
 560         return HttpResponseRedirect('/')
 561
 562
 563 # ==================
 564 # = Authentication =
 565 # ==================
 566 @require_POST
 567 @cache.never_cache
 568 def login(request):
 569     form = AuthenticationForm(data=request.POST, prefix='login')
 570     if form.is_valid():
 571         auth.login(request, form.get_user())
 572         response_data = {'success': True, 'errors': {}}
 573     else:
 574         response_data = {'success': False, 'errors': form.errors}
 575     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 576
 577
 578 @require_POST
 579 @cache.never_cache
 580 def register(request):
 581     registration_form = UserCreationForm(request.POST, prefix='registration')
 582     if registration_form.is_valid():
 583         user = registration_form.save()
 584         user = auth.authenticate(
 585             username=registration_form.cleaned_data['username'],
 586             password=registration_form.cleaned_data['password1']
 587         )
 588         auth.login(request, user)
 589         response_data = {'success': True, 'errors': {}}
 590     else:
 591         response_data = {'success': False, 'errors': registration_form.errors}
 592     return HttpResponse(LazyEncoder(ensure_ascii=False).encode(response_data))
 593
 594
 595 @cache.never_cache
 596 def logout_then_redirect(request):
 597     auth.logout(request)
 598     return HttpResponseRedirect(urlquote_plus(request.GET.get('next', '/'), safe='/?='))
 599
 600
 601
 602 # =========
 603 # = Admin =
 604 # =========
 605 @login_required
 606 @staff_required
 607 def import_book(request):
 608     """docstring for import_book"""
 609     book_import_form = forms.BookImportForm(request.POST, request.FILES)
 610     if book_import_form.is_valid():
 611         try:
 612             book_import_form.save()
 613         except:
 614             info = sys.exc_info()
 615             exception = pprint.pformat(info[1])
 616             tb = '\n'.join(traceback.format_tb(info[2]))
 617             _('Today is %(month)s, %(day)s.') % {'month': m, 'day': d}
 618             return HttpResponse(_("An error occurred: %(exception)s\n\n%(tb)s") % {'exception':exception, 'tb':tb}, mimetype='text/plain')
 619         return HttpResponse(_("Book imported successfully"))
 620     else:
 621         return HttpResponse(_("Error importing file: %r") % book_import_form.errors)
 622
 623
 624
 625 def clock(request):
 626     """ Provides server time for jquery.countdown,
 627     in a format suitable for Date.parse()
 628     """
 629     from datetime import datetime
 630     return HttpResponse(datetime.now().strftime('%Y/%m/%d %H:%M:%S'))