feat: 사용자 정보 조회 로직 작성

src/main/java/Gotcha/domain/user/controller/UserController.java

@@ -1,12 +1,17 @@
 package Gotcha.domain.user.controller;
 
 import Gotcha.common.api.SuccessRes;
+import Gotcha.common.jwt.auth.SecurityUserDetails;
 import Gotcha.domain.user.api.UserApi;
 import Gotcha.domain.user.dto.NicknameReq;
+import Gotcha.domain.user.dto.UserInfoRes;
 import Gotcha.domain.user.service.UserService;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
+import org.springframework.http.HttpStatus;
 import org.springframework.http.ResponseEntity;
+import org.springframework.security.core.annotation.AuthenticationPrincipal;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
@@ -25,4 +30,11 @@ public ResponseEntity<?> checkNickname(@Valid @RequestBody NicknameReq nicknameR
 
         return ResponseEntity.ok(SuccessRes.from("사용 가능한 닉네임입니다."));
     }
+
+    @GetMapping("/me/main-info")
+    public ResponseEntity<?> getUserInfo(@AuthenticationPrincipal SecurityUserDetails userDetails){
+        UserInfoRes userInfoRes = userService.getUserInfo(userDetails.getId(), userDetails.getRole());
+
+        return ResponseEntity.status(HttpStatus.OK).body(userInfoRes);
+    }
 }

src/main/java/Gotcha/domain/user/exceptionCode/UserExceptionCode.java

@@ -9,7 +9,8 @@
 @ToString
 public enum UserExceptionCode implements ExceptionCode {
     NICKNAME_EXIST(HttpStatus.CONFLICT, "이미 존재하는 닉네임입니다."),
-    EMAIL_EXIST(HttpStatus.CONFLICT, "이미 가입된 이메일입니다.");
+    EMAIL_EXIST(HttpStatus.CONFLICT, "이미 가입된 이메일입니다."),
+    INVALID_USERID(HttpStatus.NOT_FOUND, "존재하지 않는 사용자입니다.");
 
     private final HttpStatus status;
     private final String message;

src/main/java/Gotcha/domain/user/service/UserService.java

@@ -2,12 +2,18 @@
 
 import Gotcha.common.exception.CustomException;
 import Gotcha.common.util.RedisUtil;
+import Gotcha.domain.user.dto.UserInfoRes;
+import Gotcha.domain.user.entity.Role;
+import Gotcha.domain.user.entity.User;
 import Gotcha.domain.user.exceptionCode.UserExceptionCode;
 import Gotcha.domain.user.repository.UserRepository;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
+import java.util.Optional;
+
+import static Gotcha.common.redis.RedisProperties.GUEST_KEY_PREFIX;
 import static Gotcha.common.redis.RedisProperties.NICKNAME_VERIFY_KEY_PREFIX;
 
 @Service
@@ -35,4 +41,24 @@ public void checkEmail(String email) {
             throw new CustomException(UserExceptionCode.EMAIL_EXIST);
         }
     }
+
+   @Transactional(readOnly = true)
+    public UserInfoRes getUserInfo(Long userId, Role role){
+        User user = switch (role){
+            case GUEST -> findGuestByGuestId(userId);
+            case USER,ADMIN -> findUserByUserId(userId);
+            default -> throw new CustomException(UserExceptionCode.INVALID_USERID);
+        };
+        return UserInfoRes.fromEntity(user);
+    }
+
+    private User findUserByUserId(Long userId){
+        return userRepository.findById(userId)
+                .orElseThrow(()->new CustomException(UserExceptionCode.INVALID_USERID));
+    }
+
+    private User findGuestByGuestId(Long guestId){
+        return Optional.ofNullable((User) redisUtil.getData(GUEST_KEY_PREFIX + guestId))
+                .orElseThrow(()-> new CustomException(UserExceptionCode.INVALID_USERID));
+    }
 }