Own Spring OAuth2 server together with 3rdparty OAuth providers

Question

In a Spring Boot application, I have an OAuth2 Authorization/Resource servers. Based on this and Spring Security, I have secured my Spring MVC REST API endpoints.

In

Answer 1

This tutorial shows how to achieve exactly that (if I understood the problem correctly) : having an auth server issuing your own oauth2 tokens based on external oauth2 authentication. The corresponding code is available here.

The gist of it is that you use @EnableOAuth2Client in addition to @EnableAuthorizationServer and insert an OAuth2ClientAuthenticationProcessingFilter filter before spring security default ones.