[Satosa-dev] More flexible discovery service process for SAML backend?

Hi, Right now the saml2.py in src/satosa/backends/ has def disco_query(self): """ Makes a request to the discovery server :type context: satosa.context.Context :type internal_req: satosa.internal.InternalData :rtype: satosa.response.SeeOther :param context: The current context :param internal_req: The request :return: Response """ return_url = self.sp.config.getattr("endpoints", "sp")["discovery_response"][0][0] loc = self.sp.create_discovery_service_request(self.discosrv, self.sp.config.entityid, **{"return": return_url}) return SeeOther(loc) Essentially this restricts the flow to one and only one IdP discovery service that is configured statically. I propose that this method be enhanced so that it can inspect the context and internal data and if it finds a URL for the discovery service to use it overrides what is in the configuration. Then one can configure a request microservice that uses some logic to set the URL for the discovery service, such as which SP the authentication request came from. Since the comment for the method already includes a mention of the context and internal data, I suspect this functionality was designed but never implemented. Any objections to me implementing it? Any other comments or input? Thanks, Scott K