forked from mirrors/bookwyrm
115 lines
4.1 KiB
Python
115 lines
4.1 KiB
Python
''' lists of objects '''
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from django.core.paginator import Paginator
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from bookwyrm import activitypub
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from bookwyrm.settings import PAGE_LENGTH
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from . import ActivitypubMixin, generate_activity
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class OrderedCollectionPageMixin(ActivitypubMixin):
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''' just the paginator utilities, so you don't HAVE to
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override ActivitypubMixin's to_activity (ie, for outbox '''
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@property
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def collection_remote_id(self):
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''' this can be overriden if there's a special remote id, ie outbox '''
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return self.remote_id
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def to_ordered_collection(self, queryset, \
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remote_id=None, page=False, collection_only=False, **kwargs):
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''' an ordered collection of whatevers '''
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if not queryset.ordered:
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raise RuntimeError('queryset must be ordered')
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remote_id = remote_id or self.remote_id
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if page:
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return to_ordered_collection_page(
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queryset, remote_id, **kwargs)
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if collection_only or not hasattr(self, 'activity_serializer'):
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serializer = activitypub.OrderedCollection
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activity = {}
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else:
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serializer = self.activity_serializer
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# a dict from the model fields
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activity = generate_activity(self)
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if remote_id:
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activity['id'] = remote_id
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paginated = Paginator(queryset, PAGE_LENGTH)
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# add computed fields specific to orderd collections
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activity['totalItems'] = paginated.count
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activity['first'] = '%s?page=1' % remote_id
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activity['last'] = '%s?page=%d' % (remote_id, paginated.num_pages)
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return serializer(**activity).serialize()
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# pylint: disable=unused-argument
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def to_ordered_collection_page(
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queryset, remote_id, id_only=False, page=1, **kwargs):
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''' serialize and pagiante a queryset '''
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paginated = Paginator(queryset, PAGE_LENGTH)
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activity_page = paginated.page(page)
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if id_only:
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items = [s.remote_id for s in activity_page.object_list]
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else:
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items = [s.to_activity() for s in activity_page.object_list]
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prev_page = next_page = None
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if activity_page.has_next():
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next_page = '%s?page=%d' % (remote_id, activity_page.next_page_number())
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if activity_page.has_previous():
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prev_page = '%s?page=%d' % \
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(remote_id, activity_page.previous_page_number())
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return activitypub.OrderedCollectionPage(
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id='%s?page=%s' % (remote_id, page),
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partOf=remote_id,
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orderedItems=items,
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next=next_page,
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prev=prev_page
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).serialize()
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class OrderedCollectionMixin(OrderedCollectionPageMixin):
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''' extends activitypub models to work as ordered collections '''
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@property
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def collection_queryset(self):
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''' usually an ordered collection model aggregates a different model '''
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raise NotImplementedError('Model must define collection_queryset')
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activity_serializer = activitypub.OrderedCollection
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def to_activity(self, **kwargs):
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''' an ordered collection of the specified model queryset '''
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return self.to_ordered_collection(self.collection_queryset, **kwargs)
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class CollectionItemMixin(ActivitypubMixin):
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''' for items that are part of an (Ordered)Collection '''
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activity_serializer = activitypub.Add
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object_field = collection_field = None
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def to_add_activity(self):
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''' AP for shelving a book'''
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object_field = getattr(self, self.object_field)
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collection_field = getattr(self, self.collection_field)
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return activitypub.Add(
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id='%s#add' % self.remote_id,
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actor=self.user.remote_id,
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object=object_field.to_activity(),
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target=collection_field.remote_id
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).serialize()
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def to_remove_activity(self):
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''' AP for un-shelving a book'''
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object_field = getattr(self, self.object_field)
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collection_field = getattr(self, self.collection_field)
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return activitypub.Remove(
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id='%s#remove' % self.remote_id,
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actor=self.user.remote_id,
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object=object_field.to_activity(),
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target=collection_field.remote_id
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).serialize()
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