add backend

backend/src/main/java/com/yoyuzh/config/SecurityConfig.java

@@ -0,0 +1,83 @@
+package com.yoyuzh.config;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.yoyuzh.auth.CustomUserDetailsService;
+import com.yoyuzh.common.ApiResponse;
+import com.yoyuzh.common.ErrorCode;
+import lombok.RequiredArgsConstructor;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.http.MediaType;
+import org.springframework.security.authentication.AuthenticationManager;
+import org.springframework.security.authentication.AuthenticationProvider;
+import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
+import org.springframework.security.config.Customizer;
+import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
+import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
+import org.springframework.security.config.http.SessionCreationPolicy;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.web.SecurityFilterChain;
+import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
+
+@Configuration
+@EnableWebSecurity
+@EnableMethodSecurity
+@RequiredArgsConstructor
+public class SecurityConfig {
+
+    private final JwtAuthenticationFilter jwtAuthenticationFilter;
+    private final CustomUserDetailsService userDetailsService;
+    private final ObjectMapper objectMapper;
+
+    @Bean
+    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
+        http
+                .csrf(csrf -> csrf.disable())
+                .cors(Customizer.withDefaults())
+                .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
+                .authorizeHttpRequests(auth -> auth
+                        .requestMatchers("/api/auth/**", "/v3/api-docs/**", "/swagger-ui/**", "/swagger-ui.html")
+                        .permitAll()
+                        .requestMatchers("/api/files/**", "/api/user/**")
+                        .authenticated()
+                        .anyRequest()
+                        .permitAll())
+                .authenticationProvider(authenticationProvider())
+                .exceptionHandling(ex -> ex
+                        .authenticationEntryPoint((request, response, e) -> {
+                            response.setStatus(401);
+                            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+                            objectMapper.writeValue(response.getWriter(),
+                                    ApiResponse.error(ErrorCode.NOT_LOGGED_IN, "用户未登录"));
+                        })
+                        .accessDeniedHandler((request, response, e) -> {
+                            response.setStatus(403);
+                            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+                            objectMapper.writeValue(response.getWriter(),
+                                    ApiResponse.error(ErrorCode.PERMISSION_DENIED, "权限不足"));
+                        }))
+                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
+        return http.build();
+    }
+
+    @Bean
+    public AuthenticationProvider authenticationProvider() {
+        DaoAuthenticationProvider provider = new DaoAuthenticationProvider();
+        provider.setUserDetailsService(userDetailsService);
+        provider.setPasswordEncoder(passwordEncoder());
+        return provider;
+    }
+
+    @Bean
+    public AuthenticationManager authenticationManager(AuthenticationConfiguration configuration) throws Exception {
+        return configuration.getAuthenticationManager();
+    }
+
+    @Bean
+    public PasswordEncoder passwordEncoder() {
+        return new BCryptPasswordEncoder();
+    }
+}