@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
    @Override
    protected void configure(HttpSecurity http) throws Exception {
        http
            .csrf().disable()
            .authorizeRequests()
            .antMatchers("/api/public/**").permitAll()
            .anyRequest().authenticated()
            .and()
            .formLogin()
            .and()
            .httpBasic();
    }
    @Override
    protected void configure(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .inMemoryAuthentication()
            .withUser("user").password("{noop}password").roles("USER")
            .and()
            .withUser("admin").password("{noop}admin").roles("ADMIN");
    }
}

@Configuration
public class SecurityConfig {
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }
    @Autowired
    public void configureGlobal(AuthenticationManagerBuilder auth) throws Exception {
        auth
            .userDetailsService(userDetailsService())
            .passwordEncoder(passwordEncoder());
    }
}

@Service
public class UserDetailsServiceImpl implements UserDetailsService {
    @Autowired
    private UserRepository userRepository;
    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        User user = userRepository.findByUsername(username)
            .orElseThrow(() -> new UsernameNotFoundException("User not found: " + username));
        return org.springframework.security.core.userdetails.User.builder()
            .username(user.getUsername())
            .password(user.getPassword())
            .roles(user.getRoles().toArray(new String[0]))
            .build();
    }
}

@Configuration
public class OAuth2Config {
    @Bean
    public ClientRegistrationRepository clientRegistrationRepository() {
        return new InMemoryClientRegistrationRepository(
            ClientRegistration.withRegistrationId("github")
                .clientId("client-id")
                .clientSecret("client-secret")
                .redirectUri("{baseUrl}/login/oauth2/code/{registrationId}")
                .authorizationUri("https://github.com/login/oauth/authorize")
                .tokenUri("https://github.com/login/oauth/access_token")
                .userInfoUri("https://api.github.com/user")
                .userNameAttributeName(IdTokenClaimNames.SUB)
                .clientName("GitHub")
                .build()
        );
    }
}

spring:
  security:
    oauth2:
      client:
        registration:
          google:
            client-id: your-client-id
            client-secret: your-client-secret
            redirect-uri: "{baseUrl}/login/oauth2/code/{registrationId}"
            scope:
              - email
              - profile

@Configuration
public class JwtConfig {
    @Bean
    public JwtEncoder jwtEncoder() {
        SecretKey key = Keys.secretKeyFor(SignatureAlgorithm.HS256);
        return new NimbusJwtEncoder(new ImmutableSecret<>(key.getEncoded()));
    }
    @Bean
    public JwtDecoder jwtDecoder() {
        SecretKey key = Keys.secretKeyFor(SignatureAlgorithm.HS256);
        return NimbusJwtDecoder.withSecretKey(key).build();
    }
}

@Service
public class JwtService {
    @Autowired
    private JwtEncoder encoder;
    @Autowired
    private JwtDecoder decoder;
    public String generateToken(UserDetails userDetails) {
        Map<String, Object> claims = new HashMap<>();
        claims.put("roles", userDetails.getAuthorities().stream()
            .map(GrantedAuthority::getAuthority)
            .collect(Collectors.toList()));
        JwtClaimsSet claimsSet = JwtClaimsSet.builder()
            .subject(userDetails.getUsername())
            .issuedAt(Instant.now())
            .expiresAt(Instant.now().plus(Duration.ofHours(24)))
            .claims(claims)
            .build();
        return encoder.encode(JwtEncoderParameters.from(claimsSet)).getTokenValue();
    }
    public Jwt decodeToken(String token) {
        return decoder.decode(token);
    }
}

@RestController
@RequestMapping("/api/users")
public class UserController {
    @PreAuthorize("hasRole('ADMIN')")
    @GetMapping
    public List<User> getAllUsers() {
        // 只有管理員可以訪問(wèn)
    }
    @PreAuthorize("#id == authentication.principal.id or hasRole('ADMIN')")
    @GetMapping("/{id}")
    public User getUserById(@PathVariable Long id) {
        // 用戶(hù)只能訪問(wèn)自己的信息，管理員可以訪問(wèn)所有
    }
}

@Configuration
@EnableJpaAuditing
public class AuditConfig {
    @Bean
    public AuditorAware<String> auditorAware() {
        return () -> Optional.ofNullable(SecurityContextHolder.getContext())
            .map(SecurityContext::getAuthentication)
            .filter(Authentication::isAuthenticated)
            .map(Authentication::getName);
    }
}
@Entity
public class User {
    @Id
    private Long id;
    private String username;
    @CreatedBy
    private String createdBy;
    @CreatedDate
    private Instant createdDate;
    @LastModifiedBy
    private String lastModifiedBy;
    @LastModifiedDate
    private Instant lastModifiedDate;
    // getters and setters
}

server:
  port: 8443
  ssl:
    key-store: classpath:keystore.p12
    key-store-password: password
    key-store-type: PKCS12
    key-alias: tomcat

spring:
  security:
    oauth2:
      client:
        registration:
          google:
            client-id: ${GOOGLE_CLIENT_ID}
            client-secret: ${GOOGLE_CLIENT_SECRET}

@Configuration
public class SecurityHeadersConfig {
    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
            .headers()
            .contentSecurityPolicy("default-src 'self'")
            .frameOptions().deny()
            .xssProtection().enabled(true)
            .contentTypeOptions().enabled(true);
        
        return http.build();
    }
}

@SpringBootTest
@AutoConfigureMockMvc
public class SecurityTest {
    @Autowired
    private MockMvc mockMvc;
    @Test
    public void testPublicEndpoint() throws Exception {
        mockMvc.perform(get("/api/public/hello"))
            .andExpect(status().isOk());
    }
    @Test
    public void testProtectedEndpointWithoutAuth() throws Exception {
        mockMvc.perform(get("/api/protected/hello"))
            .andExpect(status().isUnauthorized());
    }
    @Test
    public void testProtectedEndpointWithAuth() throws Exception {
        mockMvc.perform(get("/api/protected/hello")
            .with(httpBasic("user", "password")))
            .andExpect(status().isOk());
    }
}