def url("/" <> _ = url), do: url
def url(url) do
- config = Application.get_env(:pleroma, :media_proxy, [])
-
- if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url()) do
+ if !enabled?() or local?(url) or whitelisted?(url) do
url
else
- secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
+ encode_url(url)
+ end
+ end
- # The URL is url-decoded and encoded again to ensure it is correctly encoded and not twice.
- base64 =
- url
- |> URI.decode()
- |> URI.encode()
- |> Base.url_encode64(@base64_opts)
+ defp enabled?, do: Pleroma.Config.get([:media_proxy, :enabled], false)
- sig = :crypto.hmac(:sha, secret, base64)
- sig64 = sig |> Base.url_encode64(@base64_opts)
+ defp local?(url), do: String.starts_with?(url, Pleroma.Web.base_url())
- build_url(sig64, base64, filename(url))
- end
+ defp whitelisted?(url) do
+ %{host: domain} = URI.parse(url)
+
+ Enum.any?(Pleroma.Config.get([:media_proxy, :whitelist]), fn pattern ->
+ String.equivalent?(domain, pattern)
+ end)
+ end
+
+ def encode_url(url) do
+ secret = Pleroma.Config.get([Pleroma.Web.Endpoint, :secret_key_base])
+
+ # Must preserve `%2F` for compatibility with S3
+ # https://git.pleroma.social/pleroma/pleroma/issues/580
+ replacement = get_replacement(url, ":2F:")
+
+ # The URL is url-decoded and encoded again to ensure it is correctly encoded and not twice.
+ base64 =
+ url
+ |> String.replace("%2F", replacement)
+ |> URI.decode()
+ |> URI.encode()
+ |> String.replace(replacement, "%2F")
+ |> Base.url_encode64(@base64_opts)
+
+ sig = :crypto.hmac(:sha, secret, base64)
+ sig64 = sig |> Base.url_encode64(@base64_opts)
+
+ build_url(sig64, base64, filename(url))
end
def decode_url(sig, url) do
- secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
+ secret = Pleroma.Config.get([Pleroma.Web.Endpoint, :secret_key_base])
sig = Base.url_decode64!(sig, @base64_opts)
local_sig = :crypto.hmac(:sha, secret, url)
|> Enum.filter(fn value -> value end)
|> Path.join()
end
+
+ defp get_replacement(url, replacement) do
+ if String.contains?(url, replacement) do
+ get_replacement(url, replacement <> replacement)
+ else
+ replacement
+ end
+ end
end