controller.ex (1447B)
1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
4
5 defmodule Pleroma.Web.MediaProxy.MediaProxyController do
6 use Pleroma.Web, :controller
7 alias Pleroma.ReverseProxy
8 alias Pleroma.Web.MediaProxy
9
10 @default_proxy_opts [max_body_length: 25 * 1_048_576, http: [follow_redirect: true]]
11
12 def remote(conn, %{"sig" => sig64, "url" => url64} = params) do
13 with config <- Pleroma.Config.get([:media_proxy], []),
14 true <- Keyword.get(config, :enabled, false),
15 {:ok, url} <- MediaProxy.decode_url(sig64, url64),
16 :ok <- filename_matches(Map.has_key?(params, "filename"), conn.request_path, url) do
17 ReverseProxy.call(conn, url, Keyword.get(config, :proxy_opts, @default_proxy_opts))
18 else
19 false ->
20 send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))
21
22 {:error, :invalid_signature} ->
23 send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))
24
25 {:wrong_filename, filename} ->
26 redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
27 end
28 end
29
30 def filename_matches(has_filename, path, url) do
31 filename =
32 url
33 |> MediaProxy.filename()
34 |> URI.decode()
35
36 path = URI.decode(path)
37
38 if has_filename && filename && Path.basename(path) != filename do
39 {:wrong_filename, filename}
40 else
41 :ok
42 end
43 end
44 end