# Pleroma: A lightweight social networking server # Copyright © 2017-2019 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(Map.has_key?(params, "filename"), 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(has_filename, path, url) do filename = url |> MediaProxy.filename() |> URI.decode() path = URI.decode(path) if has_filename && filename && Path.basename(path) != filename do {:wrong_filename, filename} else :ok end end end