spc-pleroma/lib/pleroma/web/activity_pub/mrf/simple_policy.ex

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defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
alias Pleroma.User
@mrf_policy Application.get_env(:pleroma, :mrf_simple)
@reject Keyword.get(@mrf_policy, :reject)
defp check_reject(actor_info, object) do
if actor_info.host in @reject do
{:reject, nil}
else
{:ok, object}
end
end
@media_removal Keyword.get(@mrf_policy, :media_removal)
defp check_media_removal(actor_info, object) do
if actor_info.host in @media_removal do
object = Map.delete(object, "attachments")
end
{:ok, object}
end
@media_nsfw Keyword.get(@mrf_policy, :media_nsfw)
defp check_media_nsfw(actor_info, object) do
child_object = object["object"]
if actor_info.host in @media_nsfw and child_object["attachment"] != nil and length(child_object["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)
end
{:ok, object}
end
@ftl_removal Keyword.get(@mrf_policy, :federated_timeline_removal)
defp check_ftl_removal(actor_info, object) do
if actor_info.host in @ftl_removal do
user = User.get_by_ap_id(object["actor"])
# flip to/cc relationship to make the post unlisted
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(object, "to", to)
object = Map.put(object, "cc", cc)
end
end
{:ok, object}
end
def filter(object) do
actor_info = URI.parse(object["actor"])
with {: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