src/catalogue/api/views.py

   1 # This file is part of Wolnelektury, licensed under GNU Affero GPLv3 or later.
   2 # Copyright © Fundacja Nowoczesna Polska. See NOTICE for more information.
   3 #
   4 import json
   5 import os.path
   6 from django.conf import settings
   7 from django.http import Http404, HttpResponse
   8 from django.utils.decorators import method_decorator
   9 from django.views.decorators.cache import never_cache
  10 from rest_framework.generics import (ListAPIView, RetrieveAPIView,
  11                                      RetrieveUpdateAPIView, get_object_or_404)
  12 from rest_framework.permissions import DjangoModelPermissionsOrAnonReadOnly
  13 from rest_framework.response import Response
  14 from rest_framework import status
  15 from api.handlers import read_tags
  16 from api.utils import vary_on_auth
  17 from catalogue.forms import BookImportForm
  18 from catalogue.models import Book, Collection, Tag, Fragment, BookMedia
  19 from catalogue.models.tag import prefetch_relations
  20 from club.models import Membership
  21 from club.permissions import IsClubMember
  22 from wolnelektury.utils import re_escape
  23 from .helpers import books_after, order_books
  24 from . import serializers
  25
  26
  27 book_tag_categories = ['author', 'epoch', 'kind', 'genre']
  28
  29
  30 class CreateOnPutMixin:
  31     '''
  32     Creates a new model instance when PUTting a nonexistent resource.
  33     '''
  34     def get_object(self):
  35         try:
  36             return super().get_object()
  37         except Http404:
  38             if self.request.method == 'PUT':
  39                 lookup_url_kwarg = self.lookup_url_kwarg or self.lookup_field
  40                 return self.get_queryset().model(**{
  41                     self.lookup_field: self.kwargs[lookup_url_kwarg]
  42                 })
  43             else:
  44                 raise
  45
  46
  47 class CollectionList(ListAPIView):
  48     queryset = Collection.objects.filter(listed=True)
  49     serializer_class = serializers.CollectionListSerializer
  50
  51
  52 @vary_on_auth  # Because of 'liked'.
  53 class CollectionDetail(CreateOnPutMixin, RetrieveUpdateAPIView):
  54     permission_classes = [DjangoModelPermissionsOrAnonReadOnly]
  55     queryset = Collection.objects.all()
  56     lookup_field = 'slug'
  57     serializer_class = serializers.CollectionSerializer
  58
  59
  60 @vary_on_auth  # Because of 'liked'.
  61 class BookList(ListAPIView):
  62     permission_classes = [DjangoModelPermissionsOrAnonReadOnly]
  63     queryset = Book.objects.none()  # Required for DjangoModelPermissions
  64     serializer_class = serializers.BookListSerializer
  65
  66     def get(self, request, filename=None, **kwargs):
  67         if filename and not kwargs.get('tags') and 'count' not in request.query_params:
  68             try:
  69                 with open(os.path.join(settings.MEDIA_ROOT, 'api', '%s.%s' % (filename, request.accepted_renderer.format)), 'rb') as f:
  70                     content = f.read()
  71                 return HttpResponse(content, content_type=request.accepted_media_type)
  72             except:
  73                 pass
  74         return super().get(request, filename=filename, **kwargs)
  75
  76     def get_queryset(self):
  77         try:
  78             tags, ancestors = read_tags(
  79                 self.kwargs.get('tags', ''), self.request,
  80                 allowed=('author', 'epoch', 'kind', 'genre')
  81             )
  82         except ValueError:
  83             raise Http404
  84
  85         new_api = self.request.query_params.get('new_api')
  86         after = self.request.query_params.get('after', self.kwargs.get('after'))
  87         count = self.request.query_params.get('count', self.kwargs.get('count'))
  88         if count:
  89             try:
  90                 count = int(count)
  91             except TypeError:
  92                 raise Http404  # Fixme
  93
  94         if tags:
  95             if self.kwargs.get('top_level'):
  96                 books = Book.tagged_top_level(tags)
  97                 if not books:
  98                     raise Http404
  99                 return books
 100             else:
 101                 books = Book.tagged.with_all(tags)
 102         else:
 103             books = Book.objects.all()
 104         books = books.filter(findable=True)
 105         books = order_books(books, new_api)
 106
 107         if not Membership.is_active_for(self.request.user):
 108             books = books.exclude(preview=True)
 109
 110         if self.kwargs.get('top_level'):
 111             books = books.filter(parent=None)
 112         if self.kwargs.get('audiobooks'):
 113             books = books.filter(media__type='mp3').distinct()
 114         if self.kwargs.get('daisy'):
 115             books = books.filter(media__type='daisy').distinct()
 116         if self.kwargs.get('recommended'):
 117             books = books.filter(recommended=True)
 118         if self.kwargs.get('newest'):
 119             books = books.order_by('-created_at')
 120
 121         if after:
 122             books = books_after(books, after, new_api)
 123
 124         prefetch_relations(books, 'author')
 125         prefetch_relations(books, 'genre')
 126         prefetch_relations(books, 'kind')
 127         prefetch_relations(books, 'epoch')
 128
 129         if count:
 130             books = books[:count]
 131
 132         return books
 133
 134     def post(self, request, **kwargs):
 135         if kwargs.get('audiobooks'):
 136             return self.post_audiobook(request, **kwargs)
 137         else:
 138             return self.post_book(request, **kwargs)
 139
 140     def post_book(self, request, **kwargs):
 141         data = json.loads(request.POST.get('data'))
 142         form = BookImportForm(data)
 143         if form.is_valid():
 144             form.save()
 145             return Response({}, status=status.HTTP_201_CREATED)
 146         else:
 147             raise Http404
 148
 149     def post_audiobook(self, request, **kwargs):
 150         index = int(request.POST['part_index'])
 151         parts_count = int(request.POST['parts_count'])
 152         media_type = request.POST['type'].lower()
 153         source_sha1 = request.POST.get('source_sha1')
 154         name = request.POST.get('name', '')
 155         part_name = request.POST.get('part_name', '')
 156
 157         project_description = request.POST.get('project_description', '')
 158         project_icon = request.POST.get('project_icon', '')
 159
 160         _rest, slug = request.POST['book'].rstrip('/').rsplit('/', 1)
 161         book = Book.objects.get(slug=slug)
 162
 163         try:
 164             assert source_sha1
 165             bm = book.media.get(type=media_type, source_sha1=source_sha1)
 166         except (AssertionError, BookMedia.DoesNotExist):
 167             bm = BookMedia(book=book, type=media_type)
 168         bm.name = name
 169         bm.part_name = part_name
 170         bm.index = index
 171         bm.project_description = project_description
 172         bm.project_icon = project_icon
 173         bm.file.save(None, request.data['file'], save=False)
 174         bm.save(parts_count=parts_count)
 175
 176         return Response({}, status=status.HTTP_201_CREATED)
 177
 178
 179 @vary_on_auth  # Because of 'liked'.
 180 class BookDetail(RetrieveAPIView):
 181     queryset = Book.objects.all()
 182     lookup_field = 'slug'
 183     serializer_class = serializers.BookDetailSerializer
 184
 185
 186 @vary_on_auth  # Because of embargo links.
 187 class EbookList(BookList):
 188     serializer_class = serializers.EbookSerializer
 189
 190
 191 @method_decorator(never_cache, name='dispatch')
 192 class Preview(ListAPIView):
 193     #queryset = Book.objects.filter(preview=True)
 194     serializer_class = serializers.BookPreviewSerializer
 195
 196     def get_queryset(self):
 197         qs = Book.objects.filter(preview=True)
 198         # FIXME: temporary workaround for a problem with iOS app; see #3954.
 199         if 'Darwin' in self.request.META.get('HTTP_USER_AGENT', '') and 'debug' not in self.request.GET:
 200             qs = qs.none()
 201         return qs
 202
 203
 204 @vary_on_auth  # Because of 'liked'.
 205 class FilterBookList(ListAPIView):
 206     serializer_class = serializers.FilterBookListSerializer
 207
 208     def parse_bool(self, s):
 209         if s in ('true', 'false'):
 210             return s == 'true'
 211         else:
 212             return None
 213
 214     def get_queryset(self):
 215         key_sep = '$'
 216         search_string = self.request.query_params.get('search')
 217         is_lektura = self.parse_bool(self.request.query_params.get('lektura'))
 218         is_audiobook = self.parse_bool(self.request.query_params.get('audiobook'))
 219         preview = self.parse_bool(self.request.query_params.get('preview'))
 220         if not Membership.is_active_for(self.request.user):
 221             preview = False
 222
 223         new_api = self.request.query_params.get('new_api')
 224         after = self.request.query_params.get('after')
 225         count = int(self.request.query_params.get('count', 50))
 226         books = order_books(Book.objects.distinct(), new_api)
 227         books = books.filter(findable=True)
 228         if is_lektura is not None:
 229             books = books.filter(has_audience=is_lektura)
 230         if is_audiobook is not None:
 231             if is_audiobook:
 232                 books = books.filter(media__type='mp3')
 233             else:
 234                 books = books.exclude(media__type='mp3')
 235         if preview is not None:
 236             books = books.filter(preview=preview)
 237         for category in book_tag_categories:
 238             category_plural = category + 's'
 239             if category_plural in self.request.query_params:
 240                 slugs = self.request.query_params[category_plural].split(',')
 241                 tags = Tag.objects.filter(category=category, slug__in=slugs)
 242                 books = Book.tagged.with_any(tags, books)
 243         if (search_string is not None) and len(search_string) < 3:
 244             search_string = None
 245         if search_string:
 246             search_string = re_escape(search_string)
 247             books_author = books.filter(cached_author__iregex=r'\m' + search_string)
 248             books_title = books.filter(title__iregex=r'\m' + search_string)
 249             books_title = books_title.exclude(id__in=list(books_author.values_list('id', flat=True)))
 250             if after and (key_sep in after):
 251                 which, key = after.split(key_sep, 1)
 252                 if which == 'title':
 253                     book_lists = [(books_after(books_title, key, new_api), 'title')]
 254                 else:  # which == 'author'
 255                     book_lists = [(books_after(books_author, key, new_api), 'author'), (books_title, 'title')]
 256             else:
 257                 book_lists = [(books_author, 'author'), (books_title, 'title')]
 258         else:
 259             if after and key_sep in after:
 260                 which, key = after.split(key_sep, 1)
 261                 books = books_after(books, key, new_api)
 262             book_lists = [(books, 'book')]
 263
 264         filtered_books = []
 265         for book_list, label in book_lists:
 266             for category in book_tag_categories:
 267                 book_list = prefetch_relations(book_list, category)
 268             remaining_count = count - len(filtered_books)
 269             for book in book_list[:remaining_count]:
 270                 book.key = '%s%s%s' % (
 271                     label, key_sep, book.slug if not new_api else book.full_sort_key())
 272                 filtered_books.append(book)
 273             if len(filtered_books) == count:
 274                 break
 275
 276         return filtered_books
 277
 278
 279 class EpubView(RetrieveAPIView):
 280     queryset = Book.objects.all()
 281     lookup_field = 'slug'
 282     permission_classes = [IsClubMember]
 283
 284     @method_decorator(never_cache)
 285     def get(self, *args, **kwargs):
 286         return HttpResponse(self.get_object().get_media('epub'))
 287
 288
 289 class TagCategoryView(ListAPIView):
 290     serializer_class = serializers.TagSerializer
 291
 292     def get_queryset(self):
 293         category = self.kwargs['category']
 294         tags = Tag.objects.filter(category=category).exclude(items=None).order_by('slug')
 295         if self.request.query_params.get('book_only') == 'true':
 296             tags = tags.filter(for_books=True)
 297         if self.request.GET.get('picture_only') == 'true':
 298             tags = filter(for_pictures=True)
 299
 300         after = self.request.query_params.get('after')
 301         count = self.request.query_params.get('count')
 302         if after:
 303             tags = tags.filter(slug__gt=after)
 304         if count:
 305             tags = tags[:count]
 306
 307         return tags
 308
 309
 310 class TagView(RetrieveAPIView):
 311     permission_classes = [DjangoModelPermissionsOrAnonReadOnly]
 312     serializer_class = serializers.TagDetailSerializer
 313     queryset = Tag.objects.all()
 314
 315     def get_object(self):
 316         try:
 317             return get_object_or_404(
 318                 Tag,
 319                 category=self.kwargs['category'],
 320                 slug=self.kwargs['slug']
 321             )
 322         except Http404:
 323             if self.request.method == 'PUT':
 324                 return Tag(
 325                     category=self.kwargs['category'],
 326                     slug=self.kwargs['slug']
 327                 )
 328             else:
 329                 raise
 330
 331     def post(self, request, **kwargs):
 332         data = json.loads(request.POST.get('data'))
 333         desc = data['description_pl']
 334         obj = self.get_object()
 335         obj.description_pl = desc
 336         obj.save(update_fields=['description_pl'], quick=True)
 337         return Response({})
 338
 339
 340 @vary_on_auth  # Because of 'liked'.
 341 class FragmentList(ListAPIView):
 342     serializer_class = serializers.FragmentSerializer
 343
 344     def get_queryset(self):
 345         try:
 346             tags, ancestors = read_tags(
 347                 self.kwargs['tags'],
 348                 self.request,
 349                 allowed={'author', 'epoch', 'kind', 'genre', 'book', 'theme'}
 350             )
 351         except ValueError:
 352             raise Http404
 353         return Fragment.tagged.with_all(tags).filter(book__findable=True).select_related('book')
 354
 355
 356 @vary_on_auth  # Because of 'liked'.
 357 class FragmentView(RetrieveAPIView):
 358     serializer_class = serializers.FragmentDetailSerializer
 359
 360     def get_object(self):
 361         return get_object_or_404(
 362             Fragment,
 363             book__slug=self.kwargs['book'],
 364             anchor=self.kwargs['anchor']
 365         )