+ return rc.NOT_FOUND
+
+
+# add categorized tags fields for Book
+def _tags_getter(category):
+ @classmethod
+ def get_tags(cls, book):
+ return book.tags.filter(category=category)
+ return get_tags
+for plural, singular in category_singular.items():
+ setattr(BookDetails, plural, _tags_getter(singular))
+
+# add fields for files in Book
+def _file_getter(format):
+ field = "%s_file" % format
+ @classmethod
+ def get_file(cls, book):
+ f = getattr(book, field)
+ if f:
+ return MEDIA_BASE + f.url
+ else:
+ return ''
+ return get_file
+for format in Book.formats:
+ setattr(BookDetails, format, _file_getter(format))
+
+
+class TagDetails(object):
+ """Custom Tag fields."""
+
+ @classmethod
+ def href(cls, tag):
+ """ Returns URI in the API for the tag. """
+
+ return API_BASE + reverse("api_tag", args=[category_plural[tag.category], tag.slug])
+
+ @classmethod
+ def url(cls, tag):
+ """ Returns URL on the site. """
+
+ return WL_BASE + tag.get_absolute_url()
+
+
+class TagDetailHandler(BaseHandler, TagDetails):
+ """ Responsible for details of a single Tag object. """
+
+ fields = ['name', 'url', 'sort_key', 'description']
+
+ @piwik_track
+ def read(self, request, category, slug):
+ """ Returns details of a tag, identified by category and slug. """
+
+ try:
+ category_sng = category_singular[category]
+ except KeyError, e:
+ return rc.NOT_FOUND
+
+ try:
+ return Tag.objects.get(category=category_sng, slug=slug)
+ except Tag.DoesNotExist:
+ return rc.NOT_FOUND
+
+
+class TagsHandler(BaseHandler, TagDetails):
+ """ Main handler for Tag objects.
+
+ Responsible for lists of Tag objects
+ and fields used for representing Tags.
+
+ """
+ allowed_methods = ('GET',)
+ model = Tag
+ fields = ['name', 'href', 'url']
+
+ @piwik_track
+ def read(self, request, category):
+ """ Lists all tags in the category (eg. all themes). """
+
+ try:
+ category_sng = category_singular[category]
+ except KeyError, e:
+ return rc.NOT_FOUND
+
+ tags = Tag.objects.filter(category=category_sng).exclude(book_count=0)
+ if tags.exists():
+ return tags
+ else:
+ return rc.NOT_FOUND
+
+
+class FragmentDetails(object):
+ """Custom Fragment fields."""
+
+ @classmethod
+ def href(cls, fragment):
+ """ Returns URI in the API for the fragment. """
+
+ return API_BASE + reverse("api_fragment",
+ args=[fragment.book.slug, fragment.anchor])
+
+ @classmethod
+ def url(cls, fragment):
+ """ Returns URL on the site for the fragment. """
+
+ return WL_BASE + fragment.get_absolute_url()
+
+ @classmethod
+ def themes(cls, fragment):
+ """ Returns a list of theme tags for the fragment. """
+
+ return fragment.tags.filter(category='theme')
+
+
+class FragmentDetailHandler(BaseHandler, FragmentDetails):
+ fields = ['book', 'anchor', 'text', 'url', 'themes']
+
+ @piwik_track
+ def read(self, request, book, anchor):
+ """ Returns details of a fragment, identified by book slug and anchor. """
+ try:
+ return Fragment.objects.get(book__slug=book, anchor=anchor)
+ except Fragment.DoesNotExist:
+ return rc.NOT_FOUND
+
+
+class FragmentsHandler(BaseHandler, FragmentDetails):
+ """ Main handler for Fragments.
+
+ Responsible for lists of Fragment objects
+ and fields used for representing Fragments.
+
+ """
+ model = Fragment
+ fields = ['book', 'url', 'anchor', 'href']
+ allowed_methods = ('GET',)
+
+ categories = set(['author', 'epoch', 'kind', 'genre', 'book', 'theme'])
+
+ @piwik_track
+ def read(self, request, tags):
+ """ Lists all fragments with given book, tags, themes.
+
+ :param tags: should be a path of categories and slugs, i.e.:
+ books/book-slug/authors/an-author/themes/a-theme/
+
+ """
+ try:
+ tags = read_tags(tags, allowed=self.categories)
+ except ValueError:
+ return rc.NOT_FOUND
+ fragments = Fragment.tagged.with_all(tags).select_related('book')
+ if fragments.exists():
+ return fragments
+ else:
+ return rc.NOT_FOUND
+
+
+
+# Changes handlers
+
+class CatalogueHandler(BaseHandler):
+
+ @staticmethod
+ def fields(request, name):
+ fields_str = request.GET.get(name) if request is not None else None
+ return fields_str.split(',') if fields_str is not None else None
+
+ @staticmethod
+ def until(t=None):
+ """ Returns time suitable for use as upper time boundary for check.
+
+ Used to avoid issues with time between setting the change stamp
+ and actually saving the model in database.
+ Cuts the microsecond part to avoid issues with DBs where time has
+ more precision.
+
+ :param datetime t: manually sets the upper boundary
+
+ """
+ # set to five minutes ago, to avoid concurrency issues
+ if t is None:
+ t = datetime.now() - timedelta(seconds=settings.API_WAIT)
+ # set to whole second in case DB supports something smaller
+ return t.replace(microsecond=0)
+
+ @staticmethod
+ def book_dict(book, fields=None):
+ all_fields = ['url', 'title', 'description',
+ 'gazeta_link', 'wiki_link',
+ ] + Book.formats + BookMedia.formats + [
+ 'parent', 'parent_number',
+ 'tags',
+ 'license', 'license_description', 'source_name',
+ 'technical_editors', 'editors',
+ 'author', 'sort_key',
+ ]
+ if fields:
+ fields = (f for f in fields if f in all_fields)
+ else:
+ fields = all_fields
+
+ extra_info = book.extra_info
+
+ obj = {}
+ for field in fields:
+
+ if field in Book.formats:
+ f = getattr(book, field+'_file')
+ if f:
+ obj[field] = {
+ 'url': f.url,
+ 'size': f.size,
+ }
+
+ elif field in BookMedia.formats:
+ media = []
+ for m in book.media.filter(type=field).iterator():
+ media.append({
+ 'url': m.file.url,
+ 'size': m.file.size,
+ })
+ if media:
+ obj[field] = media
+
+ elif field == 'url':
+ obj[field] = book.get_absolute_url()
+
+ elif field == 'tags':
+ obj[field] = [t.id for t in book.tags.exclude(category__in=('book', 'set')).iterator()]
+
+ elif field == 'author':
+ obj[field] = ", ".join(t.name for t in book.tags.filter(category='author').iterator())
+
+ elif field == 'parent':
+ obj[field] = book.parent_id
+
+ elif field in ('license', 'license_description', 'source_name',
+ 'technical_editors', 'editors'):
+ f = extra_info.get(field)
+ if f:
+ obj[field] = f
+
+ else:
+ f = getattr(book, field)
+ if f:
+ obj[field] = f
+
+ obj['id'] = book.id
+ return obj
+
+ @classmethod
+ def book_changes(cls, request=None, since=0, until=None, fields=None):
+ since = datetime.fromtimestamp(int(since))
+ until = cls.until(until)
+
+ changes = {
+ 'time_checked': timestamp(until)
+ }
+
+ if not fields:
+ fields = cls.fields(request, 'book_fields')
+
+ added = []
+ updated = []
+ deleted = []
+
+ last_change = since
+ for book in Book.objects.filter(changed_at__gte=since,
+ changed_at__lt=until).iterator():
+ book_d = cls.book_dict(book, fields)
+ updated.append(book_d)
+ if updated:
+ changes['updated'] = updated
+
+ for book in Deleted.objects.filter(content_type=Book,
+ deleted_at__gte=since,
+ deleted_at__lt=until,
+ created_at__lt=since).iterator():
+ deleted.append(book.id)
+ if deleted:
+ changes['deleted'] = deleted
+
+ return changes
+
+ @staticmethod
+ def tag_dict(tag, fields=None):
+ all_fields = ('name', 'category', 'sort_key', 'description',
+ 'gazeta_link', 'wiki_link',
+ 'url', 'books',
+ )
+
+ if fields:
+ fields = (f for f in fields if f in all_fields)
+ else:
+ fields = all_fields
+
+ obj = {}
+ for field in fields:
+
+ if field == 'url':
+ obj[field] = tag.get_absolute_url()
+
+ elif field == 'books':
+ obj[field] = [b.id for b in Book.tagged_top_level([tag]).iterator()]
+
+ elif field == 'sort_key':
+ obj[field] = tag.sort_key
+
+ else:
+ f = getattr(tag, field)
+ if f:
+ obj[field] = f
+
+ obj['id'] = tag.id
+ return obj
+
+ @classmethod
+ def tag_changes(cls, request=None, since=0, until=None, fields=None, categories=None):
+ since = datetime.fromtimestamp(int(since))
+ until = cls.until(until)
+
+ changes = {
+ 'time_checked': timestamp(until)
+ }
+
+ if not fields:
+ fields = cls.fields(request, 'tag_fields')
+ if not categories:
+ categories = cls.fields(request, 'tag_categories')
+
+ all_categories = ('author', 'epoch', 'kind', 'genre')
+ if categories:
+ categories = (c for c in categories if c in all_categories)
+ else:
+ categories = all_categories
+
+ updated = []
+ deleted = []
+
+ for tag in Tag.objects.filter(category__in=categories,
+ changed_at__gte=since,
+ changed_at__lt=until).iterator():
+ # only serve non-empty tags
+ if tag.book_count:
+ tag_d = cls.tag_dict(tag, fields)
+ updated.append(tag_d)
+ elif tag.created_at < since:
+ deleted.append(tag.id)
+ if updated:
+ changes['updated'] = updated
+
+ for tag in Deleted.objects.filter(category__in=categories,
+ content_type=Tag,
+ deleted_at__gte=since,
+ deleted_at__lt=until,
+ created_at__lt=since).iterator():
+ deleted.append(tag.id)
+ if deleted:
+ changes['deleted'] = deleted
+
+ return changes
+
+ @classmethod
+ def changes(cls, request=None, since=0, until=None, book_fields=None,
+ tag_fields=None, tag_categories=None):
+ until = cls.until(until)
+ since = int(since)
+
+ if not since:
+ cache = get_cache('api')
+ key = hash((book_fields, tag_fields, tag_categories,
+ tuple(sorted(request.GET.items()))
+ ))
+ value = cache.get(key)
+ if value is not None:
+ return value
+
+ changes = {
+ 'time_checked': timestamp(until)
+ }
+
+ changes_by_type = {
+ 'books': cls.book_changes(request, since, until, book_fields),
+ 'tags': cls.tag_changes(request, since, until, tag_fields, tag_categories),
+ }
fnp / wolnelektury.git / blobdiff