debianize-mobilizon/lib/mobilizon_web/controllers/media_proxy_controller.ex

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# Portions of this file are derived from Pleroma:
# Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
# SPDX-License-Identifier: AGPL-3.0-only
# Upstream: https://git.pleroma.social/pleroma/pleroma/blob/develop/lib/pleroma/web/media_proxy/controller.ex
defmodule MobilizonWeb.MediaProxyController do
use MobilizonWeb, :controller
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alias Mobilizon.Config
alias MobilizonWeb.ReverseProxy
alias MobilizonWeb.MediaProxy
@default_proxy_opts [max_body_length: 25 * 1_048_576, http: [follow_redirect: true]]
def remote(conn, %{"sig" => sig64, "url" => url64} = params) do
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with config <- 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