y = activity.data["to"] ++ (activity.data["cc"] || [])
visible_for_user?(activity, nil) || Enum.any?(x, &(&1 in y))
end
+
+ # guard
+ def entire_thread_visible_for_user?(nil, user), do: false
+
+ # child
+ def entire_thread_visible_for_user?(
+ %Activity{data: %{"object" => %{"inReplyTo" => _parent_id}}} = tail,
+ user
+ ) do
+ parent = Activity.get_in_reply_to_activity(tail)
+ visible_for_user?(tail, user) && entire_thread_visible_for_user?(parent, user)
+ end
+
+ # root
+ def entire_thread_visible_for_user?(tail, user), do: visible_for_user?(tail, user)
+
+ # filter out broken threads
+ def contain_broken_threads(%Activity{} = activity, %User{} = user) do
+ entire_thread_visible_for_user?(activity, user)
+ end
+
+ # do post-processing on a specific activity
+ def contain_activity(%Activity{} = activity, %User{} = user) do
+ contain_broken_threads(activity, user)
+ end
+
+ # do post-processing on a timeline
+ def contain_timeline(timeline, user) do
+ timeline
+ |> Enum.filter(fn activity ->
+ contain_activity(activity, user)
+ end)
+ end
end