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   1 # Pleroma: A lightweight social networking server
   2 # Copyright © 2017-2020 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   alias Pleroma.Workers.BackgroundWorker
  12
  13   require Logger
  14
  15   @options [
  16     pool: :media,
  17     recv_timeout: 10_000
  18   ]
  19
  20   def perform(:prefetch, url) do
  21     Logger.debug("Prefetching #{inspect(url)}")
  22
  23     url
  24     |> MediaProxy.url()
  25     |> HTTP.get([], @options)
  26   end
  27
  28   def perform(:preload, %{"object" => %{"attachment" => attachments}} = _message) do
  29     Enum.each(attachments, fn
  30       %{"url" => url} when is_list(url) ->
  31         url
  32         |> Enum.each(fn
  33           %{"href" => href} ->
  34             BackgroundWorker.enqueue("media_proxy_prefetch", %{"url" => href})
  35
  36           x ->
  37             Logger.debug("Unhandled attachment URL object #{inspect(x)}")
  38         end)
  39
  40       x ->
  41         Logger.debug("Unhandled attachment #{inspect(x)}")
  42     end)
  43   end
  44
  45   @impl true
  46   def filter(
  47         %{"type" => "Create", "object" => %{"attachment" => attachments} = _object} = message
  48       )
  49       when is_list(attachments) and length(attachments) > 0 do
  50     BackgroundWorker.enqueue("media_proxy_preload", %{"message" => message})
  51
  52     {:ok, message}
  53   end
  54
  55   @impl true
  56   def filter(message), do: {:ok, message}
  57
  58   @impl true
  59   def describe, do: {:ok, %{}}
  60 end