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

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# Pleroma: A lightweight social networking server
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# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.SimplePolicy do
alias Pleroma.User
@moduledoc "Filter activities depending on their origin instance"
@behaviour Pleroma.Web.ActivityPub.MRF
defp check_accept(%{host: actor_host} = _actor_info, object) do
accepts = Pleroma.Config.get([:mrf_simple, :accept])
cond do
accepts == [] -> {:ok, object}
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actor_host == Pleroma.Config.get([Pleroma.Web.Endpoint, :url, :host]) -> {:ok, object}
Enum.member?(accepts, actor_host) -> {:ok, object}
true -> {:reject, nil}
end
end
defp check_reject(%{host: actor_host} = _actor_info, object) do
if Enum.member?(Pleroma.Config.get([:mrf_simple, :reject]), actor_host) do
{:reject, nil}
else
{:ok, object}
end
end
defp check_media_removal(
%{host: actor_host} = _actor_info,
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%{"type" => "Create", "object" => %{"attachment" => child_attachment}} = object
)
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when length(child_attachment) > 0 do
object =
if Enum.member?(Pleroma.Config.get([:mrf_simple, :media_removal]), actor_host) do
child_object = Map.delete(object["object"], "attachment")
Map.put(object, "object", child_object)
else
object
end
{:ok, object}
end
defp check_media_removal(_actor_info, object), do: {:ok, object}
defp check_media_nsfw(
%{host: actor_host} = _actor_info,
%{
"type" => "Create",
"object" => %{"attachment" => child_attachment} = child_object
} = object
)
when length(child_attachment) > 0 do
object =
if Enum.member?(Pleroma.Config.get([:mrf_simple, :media_nsfw]), actor_host) do
tags = (child_object["tag"] || []) ++ ["nsfw"]
child_object = Map.put(child_object, "tags", tags)
child_object = Map.put(child_object, "sensitive", true)
Map.put(object, "object", child_object)
else
object
end
{:ok, object}
end
defp check_media_nsfw(_actor_info, object), do: {:ok, object}
defp check_ftl_removal(%{host: actor_host} = _actor_info, object) do
object =
with true <-
Enum.member?(
Pleroma.Config.get([:mrf_simple, :federated_timeline_removal]),
actor_host
),
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user <- User.get_cached_by_ap_id(object["actor"]),
true <- "https://www.w3.org/ns/activitystreams#Public" in object["to"],
true <- 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
@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