src/api/handlers.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 json
   6
   7 from django.contrib.sites.models import Site
   8 from django.core.urlresolvers import reverse
   9 from django.http.response import HttpResponse
  10 from django.utils.functional import lazy
  11 from django.db import models
  12 from migdal.models import Entry
  13 from piston.handler import AnonymousBaseHandler, BaseHandler
  14 from piston.utils import rc
  15 from sorl.thumbnail import default
  16
  17 from api.models import BookUserData
  18 from catalogue.forms import BookImportForm
  19 from catalogue.models import Book, Tag, BookMedia, Fragment, Collection
  20 from catalogue.models.tag import prefetch_relations
  21 from catalogue.utils import is_subscribed
  22 from librarian.cover import WLCover
  23 from picture.models import Picture
  24 from picture.forms import PictureImportForm
  25 from social.utils import likes
  26
  27 from stats.utils import piwik_track
  28 from wolnelektury.utils import re_escape
  29
  30 from . import emitters  # Register our emitters
  31
  32 API_BASE = WL_BASE = MEDIA_BASE = lazy(
  33     lambda: u'http://' + Site.objects.get_current().domain, unicode)()
  34
  35
  36 category_singular = {
  37     'authors': 'author',
  38     'kinds': 'kind',
  39     'genres': 'genre',
  40     'epochs': 'epoch',
  41     'themes': 'theme',
  42     'books': 'book',
  43 }
  44 category_plural = {}
  45 for k, v in category_singular.items():
  46     category_plural[v] = k
  47
  48 book_tag_categories = ['author', 'epoch', 'kind', 'genre']
  49
  50
  51 def read_tags(tags, request, allowed):
  52     """ Reads a path of filtering tags.
  53
  54     :param str tags: a path of category and slug pairs, like: authors/an-author/...
  55     :returns: list of Tag objects
  56     :raises: ValueError when tags can't be found
  57     """
  58
  59     def process(category, slug):
  60         if category == 'book':
  61             try:
  62                 books.append(Book.objects.get(slug=slug))
  63             except Book.DoesNotExist:
  64                 raise ValueError('Unknown book.')
  65         try:
  66             real_tags.append(Tag.objects.get(category=category, slug=slug))
  67         except Tag.DoesNotExist:
  68             raise ValueError('Tag not found')
  69
  70     if not tags:
  71         return [], []
  72
  73     tags = tags.strip('/').split('/')
  74     real_tags = []
  75     books = []
  76     while tags:
  77         category = tags.pop(0)
  78         slug = tags.pop(0)
  79
  80         try:
  81             category = category_singular[category]
  82         except KeyError:
  83             raise ValueError('Unknown category.')
  84
  85         if category not in allowed:
  86             raise ValueError('Category not allowed.')
  87         process(category, slug)
  88
  89     for key in request.GET:
  90         if key in category_singular:
  91             category = category_singular[key]
  92             if category in allowed:
  93                 for slug in request.GET.getlist(key):
  94                     process(category, slug)
  95     return real_tags, books
  96
  97
  98 # RESTful handlers
  99
 100
 101 class BookMediaHandler(BaseHandler):
 102     """ Responsible for representing media in Books. """
 103
 104     model = BookMedia
 105     fields = ['name', 'type', 'url', 'artist', 'director']
 106
 107     @classmethod
 108     def url(cls, media):
 109         """ Link to media on site. """
 110
 111         return MEDIA_BASE + media.file.url
 112
 113     @classmethod
 114     def artist(cls, media):
 115         return media.extra_info.get('artist_name', '')
 116
 117     @classmethod
 118     def director(cls, media):
 119         return media.extra_info.get('director_name', '')
 120
 121
 122 class BookDetails(object):
 123     """Custom fields used for representing Books."""
 124
 125     @classmethod
 126     def href(cls, book):
 127         """ Returns an URI for a Book in the API. """
 128         return API_BASE + reverse("api_book", args=[book.slug])
 129
 130     @classmethod
 131     def url(cls, book):
 132         """ Returns Book's URL on the site. """
 133         return WL_BASE + book.get_absolute_url()
 134
 135     @classmethod
 136     def children(cls, book):
 137         """ Returns all children for a book. """
 138         return book.children.order_by('parent_number', 'sort_key')
 139
 140     @classmethod
 141     def media(cls, book):
 142         """ Returns all media for a book. """
 143         return book.media.all()
 144
 145     @classmethod
 146     def cover(cls, book):
 147         return MEDIA_BASE + book.cover.url if book.cover else ''
 148
 149     @classmethod
 150     def cover_thumb(cls, book):
 151         return MEDIA_BASE + default.backend.get_thumbnail(
 152                     book.cover, "139x193").url if book.cover else ''
 153
 154     @classmethod
 155     def simple_thumb(cls, book):
 156         return MEDIA_BASE + book.cover_api_thumb.url if book.cover_api_thumb else ''
 157
 158     @classmethod
 159     def simple_cover(cls, book):
 160         return MEDIA_BASE + book.simple_cover.url if book.simple_cover else ''
 161
 162     @classmethod
 163     def cover_color(cls, book):
 164         return WLCover.epoch_colors.get(book.extra_info['epoch'], '#000000')
 165
 166
 167 class BookDetailHandler(BaseHandler, BookDetails):
 168     """ Main handler for Book objects.
 169
 170     Responsible for single Book details.
 171     """
 172     allowed_methods = ['GET']
 173     fields = ['title', 'parent', 'children'] + Book.formats + [
 174         'media', 'url', 'cover', 'cover_thumb', 'simple_thumb', 'simple_cover', 'fragment_data', 'audio_length',
 175         'preview', 'cover_color'] + [
 176             category_plural[c] for c in book_tag_categories]
 177
 178     @piwik_track
 179     def read(self, request, book):
 180         """ Returns details of a book, identified by a slug and lang. """
 181         try:
 182             return Book.objects.get(slug=book)
 183         except Book.DoesNotExist:
 184             return rc.NOT_FOUND
 185
 186
 187 class AnonymousBooksHandler(AnonymousBaseHandler, BookDetails):
 188     """ Main handler for Book objects.
 189
 190     Responsible for lists of Book objects.
 191     """
 192     allowed_methods = ('GET',)
 193     model = Book
 194     fields = book_tag_categories + [
 195         'href', 'title', 'url', 'cover', 'cover_thumb', 'slug', 'simple_thumb', 'has_audio', 'cover_color']
 196
 197     @classmethod
 198     def genres(cls, book):
 199         """ Returns all media for a book. """
 200         return book.tags.filter(category='genre')
 201
 202     @piwik_track
 203     def read(self, request, tags=None, top_level=False, audiobooks=False, daisy=False, pk=None,
 204              recommended=False, newest=False, books=None,
 205              after=None, before=None, count=None):
 206         """ Lists all books with given tags.
 207
 208         :param tags: filtering tags; should be a path of categories
 209              and slugs, i.e.: authors/an-author/epoch/an-epoch/
 210         :param top_level: if True and a book is included in the results,
 211              it's children are aren't. By default all books matching the tags
 212              are returned.
 213         """
 214         if pk is not None:
 215             try:
 216                 return Book.objects.get(pk=pk)
 217             except Book.DoesNotExist:
 218                 return rc.NOT_FOUND
 219
 220         try:
 221             tags, _ancestors = read_tags(tags, request, allowed=book_tag_categories)
 222         except ValueError:
 223             return rc.NOT_FOUND
 224
 225         if 'after' in request.GET:
 226             after = request.GET['after']
 227         if 'before' in request.GET:
 228             before = request.GET['before']
 229         if 'count' in request.GET:
 230             count = request.GET['count']
 231
 232         if tags:
 233             if top_level:
 234                 books = Book.tagged_top_level(tags)
 235                 return books if books else rc.NOT_FOUND
 236             else:
 237                 books = Book.tagged.with_all(tags)
 238         else:
 239             books = books if books is not None else Book.objects.all()
 240         books = books.order_by('slug')
 241
 242         if top_level:
 243             books = books.filter(parent=None)
 244         if audiobooks:
 245             books = books.filter(media__type='mp3').distinct()
 246         if daisy:
 247             books = books.filter(media__type='daisy').distinct()
 248         if recommended:
 249             books = books.filter(recommended=True)
 250         if newest:
 251             books = books.order_by('-created_at')
 252
 253         if after:
 254             books = books.filter(slug__gt=after)
 255         if before:
 256             books = books.filter(slug__lt=before)
 257
 258         books = books.only('slug', 'title', 'cover', 'cover_thumb')
 259         for category in book_tag_categories:
 260             books = prefetch_relations(books, category)
 261
 262         if count:
 263             if before:
 264                 books = list(reversed(books.order_by('-slug')[:count]))
 265             else:
 266                 books = books[:count]
 267
 268         return books
 269
 270     def create(self, request, *args, **kwargs):
 271         return rc.FORBIDDEN
 272
 273
 274 class BooksHandler(BookDetailHandler):
 275     allowed_methods = ('GET', 'POST')
 276     model = Book
 277     fields = book_tag_categories + ['href', 'title', 'url', 'cover', 'cover_thumb', 'cover_color', 'slug']
 278     anonymous = AnonymousBooksHandler
 279
 280     def create(self, request, *args, **kwargs):
 281         if not request.user.has_perm('catalogue.add_book'):
 282             return rc.FORBIDDEN
 283
 284         data = json.loads(request.POST.get('data'))
 285         form = BookImportForm(data)
 286         if form.is_valid():
 287             form.save()
 288             return rc.CREATED
 289         else:
 290             return rc.NOT_FOUND
 291
 292
 293 class EpubHandler(BookDetailHandler):
 294     def read(self, request, slug):
 295         if not is_subscribed(request.user):
 296             return rc.FORBIDDEN
 297         try:
 298             book = Book.objects.get(slug=slug)
 299         except Book.DoesNotExist:
 300             return rc.NOT_FOUND
 301         response = HttpResponse(book.get_media('epub'))
 302         return response
 303
 304
 305 class EBooksHandler(AnonymousBooksHandler):
 306     fields = ('author', 'href', 'title', 'cover') + tuple(Book.ebook_formats) + ('slug',)
 307
 308
 309 class BookProxy(models.Model):
 310     class Meta:
 311         managed = False
 312
 313     def __init__(self, book, key):
 314         self.book = book
 315         self.key = key
 316
 317     def __getattr__(self, item):
 318         if item not in ('book', 'key'):
 319             return self.book.__getattribute__(item)
 320         else:
 321             return self.__getattribute__(item)
 322
 323
 324 class QuerySetProxy(models.QuerySet):
 325     def __init__(self, l):
 326         self.list = l
 327
 328     def __iter__(self):
 329         return iter(self.list)
 330
 331
 332 class FilterBooksHandler(AnonymousBooksHandler):
 333     fields = book_tag_categories + [
 334         'href', 'title', 'url', 'cover', 'cover_thumb', 'cover_color', 'simple_thumb', 'has_audio', 'slug', 'key']
 335
 336     def parse_bool(self, s):
 337         if s in ('true', 'false'):
 338             return s == 'true'
 339         else:
 340             return None
 341
 342     def read(self, request):
 343         key_sep = '$'
 344         search_string = request.GET.get('search')
 345         is_lektura = self.parse_bool(request.GET.get('lektura'))
 346         is_audiobook = self.parse_bool(request.GET.get('audiobook'))
 347         preview = self.parse_bool(request.GET.get('preview'))
 348
 349         after = request.GET.get('after')
 350         count = int(request.GET.get('count', 50))
 351         books = Book.objects.distinct().order_by('slug')
 352         if is_lektura is not None:
 353             books = books.filter(has_audience=is_lektura)
 354         if is_audiobook is not None:
 355             if is_audiobook:
 356                 books = books.filter(media__type='mp3')
 357             else:
 358                 books = books.exclude(media__type='mp3')
 359         if preview is not None:
 360             books = books.filter(preview=preview)
 361         for key in request.GET:
 362             if key in category_singular:
 363                 category = category_singular[key]
 364                 if category in book_tag_categories:
 365                     slugs = request.GET[key].split(',')
 366                     tags = Tag.objects.filter(category=category, slug__in=slugs)
 367                     books = Book.tagged.with_any(tags, books)
 368         if (search_string is not None) and len(search_string) < 3:
 369             search_string = None
 370         if search_string:
 371             search_string = re_escape(search_string)
 372             books_author = books.filter(cached_author__iregex='\m' + search_string)
 373             books_title = books.filter(title__iregex='\m' + search_string)
 374             books_title = books_title.exclude(id__in=list(books_author.values_list('id', flat=True)))
 375             if after and (key_sep in after):
 376                 which, slug = after.split(key_sep, 1)
 377                 if which == 'title':
 378                     book_lists = [(books_title.filter(slug__gt=slug), 'title')]
 379                 else:  # which == 'author'
 380                     book_lists = [(books_author.filter(slug__gt=slug), 'author'), (books_title, 'title')]
 381             else:
 382                 book_lists = [(books_author, 'author'), (books_title, 'title')]
 383         else:
 384             if after and key_sep in after:
 385                 which, slug = after.split(key_sep, 1)
 386                 books = books.filter(slug__gt=slug)
 387             book_lists = [(books, 'book')]
 388
 389         filtered_books = []
 390         for book_list, label in book_lists:
 391             book_list = book_list.only('slug', 'title', 'cover', 'cover_thumb')
 392             for category in book_tag_categories:
 393                 book_list = prefetch_relations(book_list, category)
 394             remaining_count = count - len(filtered_books)
 395             new_books = [BookProxy(book, '%s%s%s' % (label, key_sep, book.slug))
 396                          for book in book_list[:remaining_count]]
 397             filtered_books += new_books
 398             if len(filtered_books) == count:
 399                 break
 400
 401         return QuerySetProxy(filtered_books)
 402
 403
 404 class BookPreviewHandler(BookDetailHandler):
 405     def read(self, request):
 406         return Book.objects.filter(preview=True)
 407
 408
 409 # add categorized tags fields for Book
 410 def _tags_getter(category):
 411     @classmethod
 412     def get_tags(cls, book):
 413         return book.tags.filter(category=category)
 414     return get_tags
 415
 416
 417 def _tag_getter(category):
 418     @classmethod
 419     def get_tag(cls, book):
 420         return book.tag_unicode(category)
 421     return get_tag
 422
 423
 424 def add_tag_getters():
 425     for plural, singular in category_singular.items():
 426         setattr(BookDetails, plural, _tags_getter(singular))
 427         setattr(BookDetails, singular, _tag_getter(singular))
 428
 429
 430 add_tag_getters()
 431
 432
 433 # add fields for files in Book
 434 def _file_getter(book_format):
 435
 436     @staticmethod
 437     def get_file(book):
 438         f_url = book.media_url(book_format)
 439         if f_url:
 440             return MEDIA_BASE + f_url
 441         else:
 442             return ''
 443     return get_file
 444
 445
 446 def add_file_getters():
 447     for book_format in Book.formats:
 448         setattr(BookDetails, book_format, _file_getter(book_format))
 449
 450
 451 add_file_getters()
 452
 453
 454 class CollectionDetails(object):
 455     """Custom Collection fields."""
 456
 457     @classmethod
 458     def href(cls, collection):
 459         """ Returns URI in the API for the collection. """
 460
 461         return API_BASE + reverse("api_collection", args=[collection.slug])
 462
 463     @classmethod
 464     def url(cls, collection):
 465         """ Returns URL on the site. """
 466
 467         return WL_BASE + collection.get_absolute_url()
 468
 469     @classmethod
 470     def books(cls, collection):
 471         return Book.objects.filter(collection.get_query())
 472
 473
 474 class CollectionDetailHandler(BaseHandler, CollectionDetails):
 475     allowed_methods = ('GET',)
 476     fields = ['url', 'title', 'description', 'books']
 477
 478     @piwik_track
 479     def read(self, request, slug):
 480         """ Returns details of a collection, identified by slug. """
 481         try:
 482             return Collection.objects.get(slug=slug)
 483         except Collection.DoesNotExist:
 484             return rc.NOT_FOUND
 485
 486
 487 class CollectionsHandler(BaseHandler, CollectionDetails):
 488     allowed_methods = ('GET',)
 489     model = Collection
 490     fields = ['url', 'href', 'title']
 491
 492     @piwik_track
 493     def read(self, request):
 494         """ Returns all collections. """
 495         return Collection.objects.all()
 496
 497
 498 class TagDetails(object):
 499     """Custom Tag fields."""
 500
 501     @classmethod
 502     def href(cls, tag):
 503         """ Returns URI in the API for the tag. """
 504
 505         return API_BASE + reverse("api_tag", args=[category_plural[tag.category], tag.slug])
 506
 507     @classmethod
 508     def url(cls, tag):
 509         """ Returns URL on the site. """
 510
 511         return WL_BASE + tag.get_absolute_url()
 512
 513
 514 class TagDetailHandler(BaseHandler, TagDetails):
 515     """ Responsible for details of a single Tag object. """
 516
 517     fields = ['name', 'url', 'sort_key', 'description']
 518
 519     @piwik_track
 520     def read(self, request, category, slug):
 521         """ Returns details of a tag, identified by category and slug. """
 522
 523         try:
 524             category_sng = category_singular[category]
 525         except KeyError:
 526             return rc.NOT_FOUND
 527
 528         try:
 529             return Tag.objects.get(category=category_sng, slug=slug)
 530         except Tag.DoesNotExist:
 531             return rc.NOT_FOUND
 532
 533
 534 class TagsHandler(BaseHandler, TagDetails):
 535     """ Main handler for Tag objects.
 536
 537     Responsible for lists of Tag objects
 538     and fields used for representing Tags.
 539
 540     """
 541     allowed_methods = ('GET',)
 542     model = Tag
 543     fields = ['name', 'href', 'url', 'slug']
 544
 545     @piwik_track
 546     def read(self, request, category=None, pk=None):
 547         """ Lists all tags in the category (eg. all themes). """
 548         if pk is not None:
 549             try:
 550                 return Tag.objects.exclude(category='set').get(pk=pk)
 551             except Book.DoesNotExist:
 552                 return rc.NOT_FOUND
 553
 554         try:
 555             category_sng = category_singular[category]
 556         except KeyError:
 557             return rc.NOT_FOUND
 558
 559         after = request.GET.get('after')
 560         before = request.GET.get('before')
 561         count = request.GET.get('count')
 562
 563         tags = Tag.objects.filter(category=category_sng).exclude(items=None).order_by('slug')
 564
 565         book_only = request.GET.get('book_only') == 'true'
 566         picture_only = request.GET.get('picture_only') == 'true'
 567         if book_only:
 568             tags = tags.filter(for_books=True)
 569         if picture_only:
 570             tags = tags.filter(for_pictures=True)
 571
 572         if after:
 573             tags = tags.filter(slug__gt=after)
 574         if before:
 575             tags = tags.filter(slug__lt=before)
 576
 577         if count:
 578             if before:
 579                 tags = list(reversed(tags.order_by('-slug')[:count]))
 580             else:
 581                 tags = tags[:count]
 582
 583         return tags
 584
 585
 586 class FragmentDetails(object):
 587     """Custom Fragment fields."""
 588
 589     @classmethod
 590     def href(cls, fragment):
 591         """ Returns URI in the API for the fragment. """
 592
 593         return API_BASE + reverse("api_fragment", args=[fragment.book.slug, fragment.anchor])
 594
 595     @classmethod
 596     def url(cls, fragment):
 597         """ Returns URL on the site for the fragment. """
 598
 599         return WL_BASE + fragment.get_absolute_url()
 600
 601     @classmethod
 602     def themes(cls, fragment):
 603         """ Returns a list of theme tags for the fragment. """
 604
 605         return fragment.tags.filter(category='theme')
 606
 607
 608 class FragmentDetailHandler(BaseHandler, FragmentDetails):
 609     fields = ['book', 'anchor', 'text', 'url', 'themes']
 610
 611     @piwik_track
 612     def read(self, request, book, anchor):
 613         """ Returns details of a fragment, identified by book slug and anchor. """
 614         try:
 615             return Fragment.objects.get(book__slug=book, anchor=anchor)
 616         except Fragment.DoesNotExist:
 617             return rc.NOT_FOUND
 618
 619
 620 class FragmentsHandler(BaseHandler, FragmentDetails):
 621     """ Main handler for Fragments.
 622
 623     Responsible for lists of Fragment objects
 624     and fields used for representing Fragments.
 625
 626     """
 627     model = Fragment
 628     fields = ['book', 'url', 'anchor', 'href']
 629     allowed_methods = ('GET',)
 630
 631     categories = {'author', 'epoch', 'kind', 'genre', 'book', 'theme'}
 632
 633     @piwik_track
 634     def read(self, request, tags):
 635         """ Lists all fragments with given book, tags, themes.
 636
 637         :param tags: should be a path of categories and slugs, i.e.:
 638              books/book-slug/authors/an-author/themes/a-theme/
 639
 640         """
 641         try:
 642             tags, ancestors = read_tags(tags, request, allowed=self.categories)
 643         except ValueError:
 644             return rc.NOT_FOUND
 645         fragments = Fragment.tagged.with_all(tags).select_related('book')
 646         if fragments.exists():
 647             return fragments
 648         else:
 649             return rc.NOT_FOUND
 650
 651
 652 class PictureHandler(BaseHandler):
 653     model = Picture
 654     fields = ('slug', 'title')
 655     allowed_methods = ('POST',)
 656
 657     def create(self, request):
 658         if not request.user.has_perm('picture.add_picture'):
 659             return rc.FORBIDDEN
 660
 661         data = json.loads(request.POST.get('data'))
 662         form = PictureImportForm(data)
 663         if form.is_valid():
 664             form.save()
 665             return rc.CREATED
 666         else:
 667             return rc.NOT_FOUND
 668
 669
 670 class UserDataHandler(BaseHandler):
 671     model = BookUserData
 672     fields = ('state', 'username')
 673     allowed_methods = ('GET', 'POST')
 674
 675     def read(self, request, slug=None):
 676         if not request.user.is_authenticated():
 677             return rc.FORBIDDEN
 678         if slug is None:
 679             return {'username': request.user.username}
 680         try:
 681             book = Book.objects.get(slug=slug)
 682         except Book.DoesNotExist:
 683             return rc.NOT_FOUND
 684         try:
 685             data = BookUserData.objects.get(book=book, user=request.user)
 686         except BookUserData.DoesNotExist:
 687             return {'state': 'not_started'}
 688         return data
 689
 690     def create(self, request, slug, state):
 691         try:
 692             book = Book.objects.get(slug=slug)
 693         except Book.DoesNotExist:
 694             return rc.NOT_FOUND
 695         if not request.user.is_authenticated():
 696             return rc.FORBIDDEN
 697         if state not in ('reading', 'complete'):
 698             return rc.NOT_FOUND
 699         data, created = BookUserData.objects.get_or_create(book=book, user=request.user)
 700         data.state = state
 701         data.save()
 702         return data
 703
 704
 705 class UserShelfHandler(BookDetailHandler):
 706     fields = book_tag_categories + [
 707         'href', 'title', 'url', 'cover', 'cover_thumb', 'simple_thumb', 'slug', 'key']
 708
 709     def parse_bool(self, s):
 710         if s in ('true', 'false'):
 711             return s == 'true'
 712         else:
 713             return None
 714
 715     def read(self, request, state):
 716         if not request.user.is_authenticated():
 717             return rc.FORBIDDEN
 718         if state not in ('reading', 'complete', 'likes'):
 719             return rc.NOT_FOUND
 720         after = request.GET.get('after')
 721         count = int(request.GET.get('count', 50))
 722         if state == 'likes':
 723             books = Book.tagged.with_any(request.user.tag_set.all())
 724         else:
 725             ids = BookUserData.objects.filter(user=request.user, complete=state == 'complete')\
 726                 .values_list('book_id', flat=True)
 727             books = Book.objects.filter(id__in=list(ids)).distinct().order_by('slug')
 728         if after:
 729             books = books.filter(slug__gt=after)
 730         if count:
 731             books = books[:count]
 732         return books
 733
 734
 735 class UserLikeHandler(BaseHandler):
 736     fields = []
 737     allowed_methods = ('GET', 'POST')
 738
 739     def read(self, request, slug):
 740         if not request.user.is_authenticated():
 741             return rc.FORBIDDEN
 742         try:
 743             book = Book.objects.get(slug=slug)
 744         except Book.DoesNotExist:
 745             return rc.NOT_FOUND
 746         return {'likes': likes(request.user, book)}
 747
 748     def create(self, request, slug, action='like'):
 749         if not request.user.is_authenticated():
 750             return rc.FORBIDDEN
 751         try:
 752             book = Book.objects.get(slug=slug)
 753         except Book.DoesNotExist:
 754             return rc.NOT_FOUND
 755         if action == 'like':
 756             book.like(request.user)
 757         elif action == 'unlike':
 758             book.unlike(request.user)
 759         return {}
 760
 761
 762 class BlogEntryHandler(BaseHandler):
 763     model = Entry
 764     fields = ('title', 'lead', 'body', 'place', 'time', 'image_url', 'gallery_urls', 'type', 'key')
 765
 766     def read(self, request):
 767         after = request.GET.get('after')
 768         count = int(request.GET.get('count', 20))
 769         entries = Entry.published_objects.filter(in_stream=True).order_by('-first_published_at')
 770         if after:
 771             entries = entries.filter(first_published_at__lt=after)
 772         if count:
 773             entries = entries[:count]
 774         return entries
 775
 776     @classmethod
 777     def image_url(cls, entry):
 778         return entry.image.url if entry.image else None
 779
 780     @classmethod
 781     def gallery_urls(cls, entry):
 782         return [photo.url() for photo in entry.photo_set.all()]
 783
 784     @classmethod
 785     def key(cls, entry):
 786         return entry.first_published_at