Pleroma/lib/pleroma/web/media_proxy/media_proxy.ex

34 lines
1023 B
Elixir
Raw Normal View History

2017-11-22 19:06:07 +01:00
defmodule Pleroma.Web.MediaProxy do
@base64_opts [padding: false]
def url(nil), do: nil
def url(url = "/" <> _), do: url
2017-11-22 19:06:07 +01:00
def url(url) do
config = Application.get_env(:pleroma, :media_proxy, [])
2018-03-30 15:01:53 +02:00
if !Keyword.get(config, :enabled, false) or String.starts_with?(url, Pleroma.Web.base_url()) do
2017-11-22 19:06:07 +01:00
url
else
secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
2017-11-22 19:06:07 +01:00
base64 = Base.url_encode64(url, @base64_opts)
sig = :crypto.hmac(:sha, secret, base64)
2017-11-22 19:06:07 +01:00
sig64 = sig |> Base.url_encode64(@base64_opts)
2018-03-30 15:01:53 +02:00
Keyword.get(config, :base_url, Pleroma.Web.base_url()) <> "/proxy/#{sig64}/#{base64}"
2017-11-22 19:06:07 +01:00
end
end
def decode_url(sig, url) do
secret = Application.get_env(:pleroma, Pleroma.Web.Endpoint)[:secret_key_base]
2017-11-22 19:06:07 +01:00
sig = Base.url_decode64!(sig, @base64_opts)
local_sig = :crypto.hmac(:sha, secret, url)
2018-03-30 15:01:53 +02:00
2017-11-22 19:06:07 +01:00
if local_sig == sig do
{:ok, Base.url_decode64!(url, @base64_opts)}
else
{:error, :invalid_signature}
end
end
end