Simple example of using Github as an identity provider with Spring Security. Drawing from this example for inspiration.

To get started, go to Github.com and add a new OAuth App under Settings -> Developer Settings -> OAuth Apps, extracting the generated clientId and clientSecret and placing them in application.properties.

Note: this demo is hard coded in CustomAuthenticationProvider to persist the administrator Demo user, regardless of who you logged in as through the identity provider. This is merely out of convenience for demo purposes.