1 defmodule Pleroma.Web.MediaProxy do
2 @base64_opts [padding: false]
8 def url(url = "/" <> _), do: url
11 config = Application.get_env(:pleroma, :media_proxy, [])
13 if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url()) do
16 secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
18 # The URL is url-decoded and encoded again to ensure it is correctly encoded and not twice.
23 |> Base.url_encode64(@base64_opts)
25 sig = :crypto.hmac(:sha, secret, base64)
26 sig64 = sig |> Base.url_encode64(@base64_opts)
28 build_url(sig64, base64, filename(url))
32 def decode_url(sig, url) do
33 secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
34 sig = Base.url_decode64!(sig, @base64_opts)
35 local_sig = :crypto.hmac(:sha, secret, url)
37 if local_sig == sig do
38 {:ok, Base.url_decode64!(url, @base64_opts)}
40 {:error, :invalid_signature}
44 def filename(url_or_path) do
45 if path = URI.parse(url_or_path).path, do: Path.basename(path)
48 def build_url(sig_base64, url_base64, filename \\ nil) do
50 Pleroma.Config.get([:media_proxy, :base_url], Pleroma.Web.base_url()),
56 |> Enum.filter(fn value -> value end)