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Programatically External SSO Authentication Check from Apex Controller
I have configured a Salesforce Org with external user-authentication provider (like Facebook) using SSO. When the User tries to login, Salesforce automatically reach out to the SSO IDP Provider and grant login accordingly. Now, I have a signature-page (Custom VF) in my Salesforce application where user has to mandatorily provide his login and password when the form is submitted. In the back-end Apex Controller Class, I want to validate this login and password with SSO IDP Provider. Is there any Salesforce Handler Class whom I can call for this and let that Salesforce handler contact the SSO IDP Provider in the same way it is doing during user Login? Or else I need to do a manual REST API Callout to the external SSO IDP Provider and there is no way Salesforce default authentication service help me here?