mindflux/src/main/java/com/example/mindflux/config/SecurityConfig.java

package com.example.mindflux.config;

import com.example.mindflux.model.User;
import com.example.mindflux.repository.UserRepository;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.core.userdetails.*;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.util.matcher.AntPathRequestMatcher;

@Configuration
public class SecurityConfig {

    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http
            .authorizeHttpRequests(auth -> auth
                .requestMatchers("/", "/login", "/register", "/impressum", "/nutzungsbedingungen", "/datenschutz", "/richtlinien", "/css/**", "/js/**", "/img/**").permitAll()
                .requestMatchers("/admin/**").hasRole("ADMIN") // NEU: Adminbereich absichern
                .requestMatchers("/api/users/**").hasRole("ADMIN")
                .anyRequest().authenticated()
            )
            .formLogin(form -> form
                .loginPage("/") // login.html liegt auf "/"
                .loginProcessingUrl("/login")
                .defaultSuccessUrl("/dashboard", true)
                .failureUrl("/?error") // zeigt Loginfehler an
                .permitAll()
            )
            .logout(logout -> logout
                // Logout-Links in den Templates sind GET -> GET-Logout erlauben, sonst 404/Fehler unter CSRF
                .logoutRequestMatcher(new AntPathRequestMatcher("/logout", "GET"))
                .logoutSuccessUrl("/?logout")
                .permitAll()
            )
            .csrf(csrf -> csrf
                // Spiele-APIs werden per fetch (application/json) ohne Token aufgerufen -> ausnehmen.
                // Reine JSON-Endpunkte sind nicht über klassische HTML-Formulare CSRF-ausnutzbar.
                .ignoringRequestMatchers("/api/games/**", "/api/techtacular/**", "/api/mindmatch/**")
            );

        return http.build();
    }

    @Bean
    public UserDetailsService userDetailsService(UserRepository userRepo) {
        return username -> {
            User user = userRepo.findByUsername(username)
                    .orElseThrow(() -> new UsernameNotFoundException("Benutzer nicht gefunden"));

            return org.springframework.security.core.userdetails.User
                    .withUsername(user.getUsername())
                    .password(user.getPassword())
                    .roles(user.getRole()) // Achtung: Nur ein String, z.B. "USER" oder "ADMIN"
                    .build();
        };
    }

    @Bean
    public BCryptPasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration config) throws Exception {
        return config.getAuthenticationManager();
    }
}