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media_proxy_warming_policy.ex
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media_proxy_warming_policy.ex
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# Pleroma: A lightweight social networking server
# Copyright © 2017-2022 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
defmodule Pleroma.Web.ActivityPub.MRF.MediaProxyWarmingPolicy do
@moduledoc "Preloads any attachments in the MediaProxy cache by prefetching them"
@behaviour Pleroma.Web.ActivityPub.MRF.Policy
alias Pleroma.HTTP
alias Pleroma.Web.MediaProxy
require Logger
@impl true
def history_awareness, do: :auto
defp prefetch(url) do
# Fetching only proxiable resources
if MediaProxy.enabled?() and MediaProxy.url_proxiable?(url) do
# If preview proxy is enabled, it'll also hit media proxy (so we're caching both requests)
prefetch_url = MediaProxy.preview_url(url)
Logger.debug("Prefetching #{inspect(url)} as #{inspect(prefetch_url)}")
fetch(prefetch_url)
end
end
defp fetch(url) do
http_client_opts = Pleroma.Config.get([:media_proxy, :proxy_opts, :http], pool: :media)
HTTP.get(url, [], http_client_opts)
end
defp preload(%{"object" => %{"attachment" => attachments}} = _activity) do
Enum.each(attachments, fn
%{"url" => url} when is_list(url) ->
url
|> Enum.each(fn
%{"href" => href} ->
prefetch(href)
x ->
Logger.debug("Unhandled attachment URL object #{inspect(x)}")
end)
x ->
Logger.debug("Unhandled attachment #{inspect(x)}")
end)
end
@impl true
def filter(%{"type" => type, "object" => %{"attachment" => attachments} = _object} = activity)
when type in ["Create", "Update"] and is_list(attachments) and length(attachments) > 0 do
preload(activity)
{:ok, activity}
end
@impl true
def filter(activity), do: {:ok, activity}
@impl true
def describe, do: {:ok, %{}}
end

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