1 # Pleroma: A lightweight social networking server
2 # Copyright © 2017-2019 Pleroma Authors <https://pleroma.social/>
3 # SPDX-License-Identifier: AGPL-3.0-only
5 defmodule Pleroma.Web.MediaProxy do
6 @base64_opts [padding: false]
12 def url("/" <> _ = url), do: url
15 config = Application.get_env(:pleroma, :media_proxy, [])
17 if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url()) do
20 secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
22 # The URL is url-decoded and encoded again to ensure it is correctly encoded and not twice.
27 |> Base.url_encode64(@base64_opts)
29 sig = :crypto.hmac(:sha, secret, base64)
30 sig64 = sig |> Base.url_encode64(@base64_opts)
32 build_url(sig64, base64, filename(url))
36 def decode_url(sig, url) do
37 secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
38 sig = Base.url_decode64!(sig, @base64_opts)
39 local_sig = :crypto.hmac(:sha, secret, url)
41 if local_sig == sig do
42 {:ok, Base.url_decode64!(url, @base64_opts)}
44 {:error, :invalid_signature}
48 def filename(url_or_path) do
49 if path = URI.parse(url_or_path).path, do: Path.basename(path)
52 def build_url(sig_base64, url_base64, filename \\ nil) do
54 Pleroma.Config.get([:media_proxy, :base_url], Pleroma.Web.base_url()),
60 |> Enum.filter(fn value -> value end)