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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(%{data: %{"tag" => tags}}) do
tags
|> Enum.filter(&is_bitstring(&1))
|> Enum.map(fn tag -> "hashtag:" <> tag end)
end
defp hashtags_to_topics(_), do: []
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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