git.squeep.com Git - akkoma/blob - lib/pleroma/web/activity_pub/mrf/subchain_policy.ex

   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2021 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   5 defmodule Pleroma.Web.ActivityPub.MRF.SubchainPolicy do
   6   alias Pleroma.Config
   7   alias Pleroma.Web.ActivityPub.MRF
   8
   9   require Logger
  10
  11   @behaviour Pleroma.Web.ActivityPub.MRF.Policy
  12
  13   defp lookup_subchain(actor) do
  14     with matches <- Config.get([:mrf_subchain, :match_actor]),
  15          {match, subchain} <- Enum.find(matches, fn {k, _v} -> String.match?(actor, k) end) do
  16       {:ok, match, subchain}
  17     else
  18       _e -> {:error, :notfound}
  19     end
  20   end
  21
  22   @impl true
  23   def filter(%{"actor" => actor} = message) do
  24     with {:ok, match, subchain} <- lookup_subchain(actor) do
  25       Logger.debug(
  26         "[SubchainPolicy] Matched #{actor} against #{inspect(match)} with subchain #{inspect(subchain)}"
  27       )
  28
  29       MRF.filter(subchain, message)
  30     else
  31       _e -> {:ok, message}
  32     end
  33   end
  34
  35   @impl true
  36   def filter(message), do: {:ok, message}
  37
  38   @impl true
  39   def describe, do: {:ok, %{}}
  40
  41   @impl true
  42   def config_description do
  43     %{
  44       key: :mrf_subchain,
  45       related_policy: "Pleroma.Web.ActivityPub.MRF.SubchainPolicy",
  46       label: "MRF Subchain",
  47       description:
  48         "This policy processes messages through an alternate pipeline when a given message matches certain criteria." <>
  49           " All criteria are configured as a map of regular expressions to lists of policy modules.",
  50       children: [
  51         %{
  52           key: :match_actor,
  53           type: {:map, {:list, :string}},
  54           description: "Matches a series of regular expressions against the actor field",
  55           suggestions: [
  56             %{
  57               ~r/https:\/\/example.com/s => [Pleroma.Web.ActivityPub.MRF.DropPolicy]
  58             }
  59           ]
  60         }
  61       ]
  62     }
  63   end
  64 end