# Pleroma: A lightweight social networking server # Copyright © 2017-2022 Pleroma Authors # SPDX-License-Identifier: AGPL-3.0-only defmodule Pleroma.Activity.Ir.Topics do alias Pleroma.Object alias Pleroma.Web.ActivityPub.Visibility def get_activity_topics(activity) do activity |> Object.normalize(fetch: false) |> generate_topics(activity) |> List.flatten() end defp generate_topics(%{data: %{"type" => "ChatMessage"}}, %{data: %{"type" => "Delete"}}) do ["user", "user:pleroma_chat"] end defp generate_topics(%{data: %{"type" => "ChatMessage"}}, %{data: %{"type" => "Create"}}) do [] end defp generate_topics(%{data: %{"type" => "Answer"}}, _) do [] end defp generate_topics(object, activity) do ["user", "list"] ++ visibility_tags(object, activity) end defp visibility_tags(object, activity) do case Visibility.get_visibility(activity) do "public" -> if activity.local do ["public", "public:local"] else ["public"] end |> item_creation_tags(object, activity) "local" -> ["public:local"] |> item_creation_tags(object, activity) "direct" -> ["direct"] _ -> [] end end defp item_creation_tags(tags, object, %{data: %{"type" => "Create"}} = activity) do tags ++ remote_topics(activity) ++ hashtags_to_topics(object) ++ attachment_topics(object, activity) end defp item_creation_tags(tags, _, _) do tags end defp hashtags_to_topics(object) do object |> Object.hashtags() |> Enum.map(fn hashtag -> "hashtag:" <> hashtag end) end defp remote_topics(%{local: true}), do: [] defp remote_topics(%{actor: actor}) when is_binary(actor), do: ["public:remote:" <> URI.parse(actor).host] defp remote_topics(_), do: [] defp attachment_topics(%{data: %{"attachment" => []}}, _act), do: [] defp attachment_topics(_object, %{local: true} = activity) do case Visibility.get_visibility(activity) do "public" -> ["public:media", "public:local:media"] "local" -> ["public:local:media"] _ -> [] end end defp attachment_topics(_object, %{actor: actor}) when is_binary(actor), do: ["public:media", "public:remote:media:" <> URI.parse(actor).host] defp attachment_topics(_object, _act), do: ["public:media"] end