honkoma/lib/pleroma/web/activity_pub/mrf/simple_policy.ex

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defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
alias Pleroma.User
@behaviour Pleroma.Web.ActivityPub.MRF
@mrf_policy Application.get_env(:pleroma, :mrf_simple)
@accept Keyword.get(@mrf_policy, :accept)
defp check_accept(%{host: actor_host} = actor_info, object)
when length(@accept) > 0 and not (actor_host in @accept) do
{:reject, nil}
end
defp check_accept(actor_info, object), do: {:ok, object}
@reject Keyword.get(@mrf_policy, :reject)
defp check_reject(%{host: actor_host} = actor_info, object) when actor_host in @reject do
{:reject, nil}
end
defp check_reject(actor_info, object), do: {:ok, object}
@media_removal Keyword.get(@mrf_policy, :media_removal)
defp check_media_removal(%{host: actor_host} = actor_info, %{"type" => "Create"} = object)
when actor_host in @media_removal do
child_object = Map.delete(object["object"], "attachment")
object = Map.put(object, "object", child_object)
{:ok, object}
end
defp check_media_removal(actor_info, object), do: {:ok, object}
@media_nsfw Keyword.get(@mrf_policy, :media_nsfw)
defp check_media_nsfw(
%{host: actor_host} = actor_info,
%{
"type" => "Create",
"object" => %{"attachment" => child_attachment} = child_object
} = object
)
when actor_host in @media_nsfw and length(child_attachment) > 0 do
tags = (child_object["tag"] || []) ++ ["nsfw"]
child_object = Map.put(child_object, "tags", tags)
child_object = Map.put(child_object, "sensitive", true)
object = Map.put(object, "object", child_object)
{:ok, object}
end
defp check_media_nsfw(actor_info, object), do: {:ok, object}
@ftl_removal Keyword.get(@mrf_policy, :federated_timeline_removal)
defp check_ftl_removal(%{host: actor_host} = actor_info, object)
when actor_host in @ftl_removal do
user = User.get_by_ap_id(object["actor"])
# flip to/cc relationship to make the post unlisted
object =
if "https://www.w3.org/ns/activitystreams#Public" in object["to"] and
user.follower_address in object["cc"] do
to =
List.delete(object["to"], "https://www.w3.org/ns/activitystreams#Public") ++
[user.follower_address]
cc =
List.delete(object["cc"], user.follower_address) ++
["https://www.w3.org/ns/activitystreams#Public"]
object
|> Map.put("to", to)
|> Map.put("cc", cc)
else
object
end
{:ok, object}
end
defp check_ftl_removal(actor_info, object), do: {:ok, object}
@impl true
def filter(object) do
actor_info = URI.parse(object["actor"])
with {:ok, object} <- check_accept(actor_info, object),
{:ok, object} <- check_reject(actor_info, object),
{:ok, object} <- check_media_removal(actor_info, object),
{:ok, object} <- check_media_nsfw(actor_info, object),
{:ok, object} <- check_ftl_removal(actor_info, object) do
{:ok, object}
else
_e -> {:reject, nil}
end
end
end