Java Spring Boot

// src/main/java/com/auth0/example/SecurityConfig.java

package com.auth0.example;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.logout.LogoutHandler;
import org.springframework.web.servlet.support.ServletUriComponentsBuilder;

import java.io.IOException;

import static org.springframework.security.config.Customizer.withDefaults;

@Configuration
public class SecurityConfig {

    @Value("${okta.oauth2.issuer}")
    private String issuer;
    @Value("${okta.oauth2.client-id}")
    private String clientId;

    @Bean
    public SecurityFilterChain configure(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(authorize -> authorize
                .requestMatchers("/", "/images/**").permitAll()
                .anyRequest().authenticated()
            )
            .oauth2Login(withDefaults())
            .logout(logout -> logout
                .addLogoutHandler(logoutHandler()));
        return http.build();
    }

    private LogoutHandler logoutHandler() {
        return (request, response, authentication) -> {
            try {
                String baseUrl = ServletUriComponentsBuilder.fromCurrentContextPath().build().toUriString();
                response.sendRedirect(issuer + "v2/logout?client_id=" + clientId + "&returnTo=" + baseUrl);
            } catch (IOException e) {
                throw new RuntimeException(e);
            }
        };
    }
}