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