oauth2-authorization-server

Docs:

Authorization Code Flow docs/authorization_code_flow.md
Authorization Code Flow with PKCE docs/authorization_code_flow_with_pkce.md

References:

Implement core service with JPA

Supported features:

• Authorization Code Flow
• Authorization Code Flow with PKCE
• Token Introspection
• Token Revocation
• Custom UserDetails
• Custom login page
• OAuth2 Login
• Allow maximum 2 sessions per user (Can change in the DefaultSecurityConfig)
• Logout
• Logout from all sessions
• Integrated with JPA to store client details (Registered Client, Authorization, AuthorizationConsent, User, and Role)
• Custom MFA page
• MFA using TOTP (Worked fine with Google Authenticator)