akkoma/lib/pleroma/web/media_proxy/controller.ex

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defmodule Pleroma.Web.MediaProxy.MediaProxyController do
use Pleroma.Web, :controller
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alias Pleroma.{Web.MediaProxy, ReverseProxy}
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@default_proxy_opts [max_body_length: 25 * 1_048_576]
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def remote(conn, params = %{"sig" => sig64, "url" => url64}) do
with config <- Pleroma.Config.get([:media_proxy]),
true <- Keyword.get(config, :enabled, false),
{:ok, url} <- MediaProxy.decode_url(sig64, url64),
filename <- Path.basename(URI.parse(url).path),
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:ok <- filename_matches(Map.has_key?(params, "filename"), conn.request_path, url) do
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ReverseProxy.call(conn, url, Keyword.get(config, :proxy_opts, @default_proxy_length))
else
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false ->
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send_resp(conn, 404, Plug.Conn.Status.reason_phrase(404))
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{:error, :invalid_signature} ->
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send_resp(conn, 403, Plug.Conn.Status.reason_phrase(403))
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{:wrong_filename, filename} ->
redirect(conn, external: MediaProxy.build_url(sig64, url64, filename))
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end
end
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def filename_matches(has_filename, path, url) do
filename = MediaProxy.filename(url)
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cond do
has_filename && filename && Path.basename(path) != filename -> {:wrong_filename, filename}
true -> :ok
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end
end
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end