validate id token with public keys Spring boot code example

Example 1: get username from jwt token request spring boot

UserDetails userDetails = (UserDetails) SecurityContextHolder.getContext().getAuthentication()
                        .getPrincipal();
String username = userDetails.getUsername();

Example 2: spring boot api key authentication example

import org.springframework.security.web.authentication.preauth.AbstractPreAuthenticatedProcessingFilter;

public class APIKeyAuthFilter extends AbstractPreAuthenticatedProcessingFilter {

    private String principalRequestHeader;

    public APIKeyAuthFilter(String principalRequestHeader) {
        this.principalRequestHeader = principalRequestHeader;
    }

    @Override
    protected Object getPreAuthenticatedPrincipal(HttpServletRequest request) {
        return request.getHeader(principalRequestHeader);
    }

    @Override
    protected Object getPreAuthenticatedCredentials(HttpServletRequest request) {
        return "N/A";
    }

}