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- # Pleroma: A lightweight social networking server
- # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
- # 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" => "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)
-
- "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}), do: ["public:media", "public:local:media"]
-
- 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
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