1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
6 @moduledoc "Preloads any attachments in the MediaProxy cache by prefetching them"
7 @behaviour Pleroma.Web.ActivityPub.MRF.Policy
10 alias Pleroma.Web.MediaProxy
20 def history_awareness, do: :auto
23 # Fetching only proxiable resources
24 if MediaProxy.enabled?() and MediaProxy.url_proxiable?(url) do
25 # If preview proxy is enabled, it'll also hit media proxy (so we're caching both requests)
26 prefetch_url = MediaProxy.preview_url(url)
28 Logger.debug("Prefetching #{inspect(url)} as #{inspect(prefetch_url)}")
30 if Pleroma.Config.get(:env) == :test do
33 ConcurrentLimiter.limit(__MODULE__, fn ->
34 Task.start(fn -> fetch(prefetch_url) end)
40 defp fetch(url), do: HTTP.get(url, [], @adapter_options)
42 defp preload(%{"object" => %{"attachment" => attachments}} = _message) do
43 Enum.each(attachments, fn
44 %{"url" => url} when is_list(url) ->
51 Logger.debug("Unhandled attachment URL object #{inspect(x)}")
55 Logger.debug("Unhandled attachment #{inspect(x)}")
60 def filter(%{"type" => type, "object" => %{"attachment" => attachments} = _object} = message)
61 when type in ["Create", "Update"] and is_list(attachments) and length(attachments) > 0 do
68 def filter(message), do: {:ok, message}
71 def describe, do: {:ok, %{}}