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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2019 Pleroma Authors <https://pleroma.social/>
   3 # SPDX-License-Identifier: AGPL-3.0-only
   4
   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
   8
   9   alias Pleroma.HTTP
  10   alias Pleroma.Web.MediaProxy
  11
  12   require Logger
  13
  14   @hackney_options [
  15     pool: :media,
  16     recv_timeout: 10_000
  17   ]
  18
  19   def perform(:prefetch, url) do
  20     Logger.info("Prefetching #{inspect(url)}")
  21
  22     url
  23     |> MediaProxy.url()
  24     |> HTTP.get([], adapter: @hackney_options)
  25   end
  26
  27   def perform(:preload, %{"object" => %{"attachment" => attachments}} = _message) do
  28     Enum.each(attachments, fn
  29       %{"url" => url} when is_list(url) ->
  30         url
  31         |> Enum.each(fn
  32           %{"href" => href} ->
  33             PleromaJobQueue.enqueue(:background, __MODULE__, [:prefetch, href])
  34
  35           x ->
  36             Logger.debug("Unhandled attachment URL object #{inspect(x)}")
  37         end)
  38
  39       x ->
  40         Logger.debug("Unhandled attachment #{inspect(x)}")
  41     end)
  42   end
  43
  44   @impl true
  45   def filter(
  46         %{"type" => "Create", "object" => %{"attachment" => attachments} = _object} = message
  47       )
  48       when is_list(attachments) and length(attachments) > 0 do
  49     PleromaJobQueue.enqueue(:background, __MODULE__, [:preload, message])
  50
  51     {:ok, message}
  52   end
  53
  54   @impl true
  55   def filter(message), do: {:ok, message}
  56
  57   @impl true
  58   def describe, do: {:ok, %{}}
  59 end