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# Pleroma: A lightweight social networking server
# Copyright © 2017-2021 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
@adapter_options [
pool: :media,
recv_timeout: 10_000
]
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)}")
if Pleroma.Config.get(:env) == :test do
fetch(prefetch_url)
else
ConcurrentLimiter.limit(__MODULE__, fn ->
Task.start(fn -> fetch(prefetch_url) end)
end)
end
end
end
defp fetch(url), do: HTTP.get(url, [], @adapter_options)
defp preload(%{"object" => %{"attachment" => attachments}} = _message) 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" => "Create", "object" => %{"attachment" => attachments} = _object} = message
)
when is_list(attachments) and length(attachments) > 0 do
preload(message)
{:ok, message}
end
@impl true
def filter(message), do: {:ok, message}
@impl true
def describe, do: {:ok, %{}}
end
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