invalidation.ex
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invalidation.ex
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	# Pleroma: A lightweight social networking server
	# Copyright © 2017-2020 Pleroma Authors <https://pleroma.social/>
	# SPDX-License-Identifier: AGPL-3.0-only

	defmodule Pleroma.Web.MediaProxy.Invalidation do
	@moduledoc false

	@callback purge(list(String.t()), Keyword.t()) :: {:ok, list(String.t())} \| {:error, String.t()}

	alias Pleroma.Config
	alias Pleroma.Web.MediaProxy

	@spec enabled?() :: boolean()
	def enabled?, do: Config.get([:media_proxy, :invalidation, :enabled])

	@spec purge(list(String.t()) \| String.t()) :: {:ok, list(String.t())} \| {:error, String.t()}
	def purge(urls) do
	prepared_urls = prepare_urls(urls)

	if enabled?() do
	do_purge(prepared_urls)
	else
	{:ok, prepared_urls}
	end
	end

	defp do_purge(urls) do
	provider = Config.get([:media_proxy, :invalidation, :provider])
	options = Config.get(provider)
	provider.purge(urls, options)
	end

	def prepare_urls(urls) do
	urls
	\|> List.wrap()
	\|> Enum.map(fn url -> [MediaProxy.url(url), MediaProxy.preview_url(url)] end)
	\|> List.flatten()
	\|> Enum.uniq()
	end
	end