✨ feat: 사용자/관리자 인증 정보 조회 기능

Author: jiwon1217

backend/src/main/java/io/f1/backend/domain/auth/api/AuthController.java

@@ -0,0 +1,30 @@
+package io.f1.backend.domain.auth.api;
+
+import static io.f1.backend.global.util.SecurityUtils.getAuthentication;
+
+import io.f1.backend.domain.admin.dto.AdminPrincipal;
+import io.f1.backend.domain.auth.dto.CurrentUserAndAdminResponse;
+import io.f1.backend.domain.user.dto.UserPrincipal;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.Authentication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/auth")
+@RequiredArgsConstructor
+public class AuthController {
+
+    @GetMapping("/me")
+    public ResponseEntity<?> getCurrentUserOrAdmin() {
+        Authentication authentication = getAuthentication();
+        Object principal = authentication.getPrincipal();
+
+        if (principal instanceof UserPrincipal userPrincipal) {
+            return ResponseEntity.ok(CurrentUserAndAdminResponse.from(userPrincipal));
+        }
+        return ResponseEntity.ok(CurrentUserAndAdminResponse.from((AdminPrincipal) principal));
+    }
+}

backend/src/main/java/io/f1/backend/domain/auth/dto/CurrentUserAndAdminResponse.java

@@ -0,0 +1,23 @@
+package io.f1.backend.domain.auth.dto;
+
+import io.f1.backend.domain.admin.dto.AdminPrincipal;
+import io.f1.backend.domain.user.dto.UserPrincipal;
+
+public record CurrentUserAndAdminResponse(Long id, String name, String role) {
+
+    public static CurrentUserAndAdminResponse from(UserPrincipal userPrincipal) {
+        return new CurrentUserAndAdminResponse(
+            userPrincipal.getUserId(),
+            userPrincipal.getUserNickname(),
+            UserPrincipal.ROLE_USER
+        );
+    }
+
+    public static CurrentUserAndAdminResponse from(AdminPrincipal adminPrincipal) {
+        return new CurrentUserAndAdminResponse(
+            adminPrincipal.getAuthenticationAdmin().adminId(),
+            adminPrincipal.getUsername(),
+            AdminPrincipal.ROLE_ADMIN
+        );
+    }
+}

backend/src/main/java/io/f1/backend/global/config/SecurityConfig.java

@@ -51,6 +51,8 @@ public SecurityFilterChain userFilterChain(HttpSecurity http) throws Exception {
                                         .hasRole("USER")
                                         .requestMatchers("/admin/**")
                                         .hasRole("ADMIN")
+                                        .requestMatchers("/auth/me")
+                                        .hasAnyRole("USER", "ADMIN")
                                         .anyRequest()
                                         .authenticated())
                 .formLogin(form -> form

backend/src/main/java/io/f1/backend/global/util/SecurityUtils.java

@@ -3,31 +3,29 @@
 import io.f1.backend.domain.admin.dto.AdminPrincipal;
 import io.f1.backend.domain.user.dto.UserPrincipal;
 import io.f1.backend.domain.user.entity.User;
-
 import jakarta.servlet.http.HttpSession;
-
+import java.util.Collections;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.Authentication;
 import org.springframework.security.core.context.SecurityContextHolder;
 
-import java.util.Collections;
-
 public class SecurityUtils {
 
-    private SecurityUtils() {}
+    private SecurityUtils() {
+    }
 
     public static void setAuthentication(User user) {
         UserPrincipal userPrincipal = new UserPrincipal(user, Collections.emptyMap());
         UsernamePasswordAuthenticationToken authentication =
-                new UsernamePasswordAuthenticationToken(
-                        userPrincipal, null, userPrincipal.getAuthorities());
+            new UsernamePasswordAuthenticationToken(
+                userPrincipal, null, userPrincipal.getAuthorities());
         SecurityContextHolder.getContext().setAuthentication(authentication);
     }
 
     public static UserPrincipal getCurrentUserPrincipal() {
         Authentication authentication = SecurityContextHolder.getContext().getAuthentication();
         if (authentication != null
-                && authentication.getPrincipal() instanceof UserPrincipal userPrincipal) {
+            && authentication.getPrincipal() instanceof UserPrincipal userPrincipal) {
             return userPrincipal;
         }
         throw new RuntimeException("E401001: 로그인이 필요합니다.");
@@ -60,4 +58,8 @@ public static AdminPrincipal getCurrentAdminPrincipal() {
         }
         throw new RuntimeException("E401001: 로그인이 필요합니다.");
     }
+
+    public static Authentication getAuthentication() {
+        return SecurityContextHolder.getContext().getAuthentication();
+    }
 }