Real World Example

Throughout this course we secure ShopEase, an online store like Flipkart or Myntra. Before writing any code, a real team writes down who may do what:

package com.shopease.config;

import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.config.Customizer;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.web.SecurityFilterChain;

@Configuration
@EnableWebSecurity
public class SecurityConfig {

    @Bean
    SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(auth -> auth
                .requestMatchers(HttpMethod.GET, "/api/products/**", "/api/categories/**").permitAll()
                .requestMatchers("/api/auth/register", "/actuator/health").permitAll()
                .requestMatchers("/api/admin/**").hasRole("ADMIN")
                .anyRequest().authenticated())
            .httpBasic(Customizer.withDefaults())
            .formLogin(Customizer.withDefaults());
        return http.build();
    }
}

Every line of this class is explained in the coming modules. Notice there is no WebSecurityConfigurerAdapter: it was removed in Spring Security 6. Modern code declares a SecurityFilterChain bean.