media_proxy_controller.ex
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media_proxy_controller.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.MediaProxyController do
	use Pleroma.Web, :controller

	alias Pleroma.ReverseProxy
	alias Pleroma.Web.MediaProxy

	@default_proxy_opts [max_body_length: 25 * 1_048_576, http: [follow_redirect: true]]

	def remote(conn, %{"sig" => sig64, "url" => url64} = params) do
	with config <- Pleroma.Config.get([:media_proxy], []),
	true <- Keyword.get(config, :enabled, false),
	{:ok, url} <- MediaProxy.decode_url(sig64, url64),
	:ok <- filename_matches(params, conn.request_path, url) do
	ReverseProxy.call(conn, url, Keyword.get(config, :proxy_opts, @default_proxy_opts))
	else
	false ->
	send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))

	{:error, :invalid_signature} ->
	send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))

	{:wrong_filename, filename} ->
	redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
	end
	end

	def filename_matches(%{"filename" => _} = _, path, url) do
	filename = MediaProxy.filename(url)

	if filename && does_not_match(path, filename) do
	{:wrong_filename, filename}
	else
	:ok
	end
	end

	def filename_matches(_, _, _), do: :ok

	defp does_not_match(path, filename) do
	basename = Path.basename(path)
	basename != filename and URI.decode(basename) != filename and URI.encode(basename) != filename
	end
	end