Is there a Saml 2.0 SSO IdP library in Elixir?

I am looking for a Saml 2.0 SSO Identity Provider library in elixir. My goal is to use my Elixir/Phoenix app as the IdP and use Slack as SP. Currently I succeed using SimpleSamlPHP as IdP to connect to Slack. I wonder if I need to implement by myself the IdP functionality.
Thanks a lot in advance.

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