Add missing ActivityPub representations (#4230)

- Follow, undo follow
- Accept follow, reject follow
- Like, undo like
- Block, undo block
- Delete (note)
- Update (actor)

app/serializers/activitypub/accept_follow_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::AcceptFollowSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+
+  has_one :object, serializer: ActivityPub::FollowSerializer
+
+  def type
+    'Accept'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.target_account)
+  end
+end

app/serializers/activitypub/block_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::BlockSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+  attribute :virtual_object, key: :object
+
+  def type
+    'Block'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def virtual_object
+    ActivityPub::TagManager.instance.uri_for(object.target_account)
+  end
+end

app/serializers/activitypub/delete_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::DeleteSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+  attribute :virtual_object, key: :object
+
+  def type
+    'Delete'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def virtual_object
+    ActivityPub::TagManager.instance.uri_for(object)
+  end
+end

app/serializers/activitypub/follow_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::FollowSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+  attribute :virtual_object, key: :object
+
+  def type
+    'Follow'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def virtual_object
+    ActivityPub::TagManager.instance.uri_for(object.target_account)
+  end
+end

app/serializers/activitypub/like_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::LikeSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+  attribute :virtual_object, key: :object
+
+  def type
+    'Like'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+
+  def virtual_object
+    ActivityPub::TagManager.instance.uri_for(object.status)
+  end
+end

app/serializers/activitypub/reject_follow_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::RejectFollowSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+
+  has_one :object, serializer: ActivityPub::FollowSerializer
+
+  def type
+    'Reject'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.target_account)
+  end
+end

app/serializers/activitypub/undo_block_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::UndoBlockSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+
+  has_one :object, serializer: ActivityPub::BlockSerializer
+
+  def type
+    'Undo'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+end

app/serializers/activitypub/undo_follow_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::UndoFollowSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+
+  has_one :object, serializer: ActivityPub::FollowSerializer
+
+  def type
+    'Undo'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+end

app/serializers/activitypub/undo_like_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::UndoLikeSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+
+  has_one :object, serializer: ActivityPub::LikeSerializer
+
+  def type
+    'Undo'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object.account)
+  end
+end

app/serializers/activitypub/update_serializer.rb

+# frozen_string_literal: true
+
+class ActivityPub::UpdateSerializer < ActiveModel::Serializer
+  attributes :type, :actor
+
+  has_one :object, serializer: ActivityPub::ActorSerializer
+
+  def type
+    'Update'
+  end
+
+  def actor
+    ActivityPub::TagManager.instance.uri_for(object)
+  end
+end