✨ feat: 닉네임 수정 기능 구현

Author: jiwon1217

backend/src/main/java/io/f1/backend/domain/user/api/UserController.java

@@ -3,13 +3,16 @@
 import static io.f1.backend.global.util.SecurityUtils.logout;
 
 import io.f1.backend.domain.user.app.UserService;
+import io.f1.backend.domain.user.dto.SignupRequestDto;
 import io.f1.backend.domain.user.dto.UserPrincipal;
 import jakarta.servlet.http.HttpSession;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
 import org.springframework.security.core.annotation.AuthenticationPrincipal;
 import org.springframework.stereotype.Controller;
 import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 
 @Controller
@@ -26,4 +29,13 @@ public ResponseEntity<Void> deleteCurrentUser(
         logout(httpSession);
         return ResponseEntity.noContent().build();
     }
+
+    @PutMapping
+    public ResponseEntity<Void> updateNickname(
+        @AuthenticationPrincipal UserPrincipal userPrincipal,
+        @RequestBody SignupRequestDto signupRequest, HttpSession httpSession) {
+        userService.updateNickname(userPrincipal.getUserId(), signupRequest.nickname(),
+            httpSession);
+        return ResponseEntity.noContent().build();
+    }
 }

backend/src/main/java/io/f1/backend/domain/user/app/UserService.java

@@ -10,11 +10,8 @@
 import io.f1.backend.domain.user.dto.SignupResponseDto;
 import io.f1.backend.domain.user.entity.User;
 import io.f1.backend.global.util.SecurityUtils;
-
 import jakarta.servlet.http.HttpSession;
-
 import lombok.RequiredArgsConstructor;
-
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
@@ -32,7 +29,7 @@ public SignupResponseDto signup(HttpSession session, SignupRequestDto signupRequ
         validateNicknameFormat(nickname);
         validateNicknameDuplicate(nickname);
 
-        User user = updateUserNickname(authenticationUser.userId(), nickname);
+        User user = initNickname(authenticationUser.userId(), nickname);
         updateSessionAfterSignup(session, user);
         SecurityUtils.setAuthentication(user);
 
@@ -41,7 +38,7 @@ public SignupResponseDto signup(HttpSession session, SignupRequestDto signupRequ
 
     private AuthenticationUser extractSessionUser(HttpSession session) {
         AuthenticationUser authenticationUser =
-                (AuthenticationUser) session.getAttribute(OAUTH_USER);
+            (AuthenticationUser) session.getAttribute(OAUTH_USER);
         if (authenticationUser == null) {
             throw new RuntimeException("E401001: 로그인이 필요합니다.");
         }
@@ -68,11 +65,11 @@ public void validateNicknameDuplicate(String nickname) {
     }
 
     @Transactional
-    public User updateUserNickname(Long userId, String nickname) {
+    public User initNickname(Long userId, String nickname) {
         User user =
-                userRepository
-                        .findById(userId)
-                        .orElseThrow(() -> new RuntimeException("E404001: 존재하지 않는 회원입니다."));
+            userRepository
+                .findById(userId)
+                .orElseThrow(() -> new RuntimeException("E404001: 존재하지 않는 회원입니다."));
         user.updateNickname(nickname);
 
         return userRepository.save(user);
@@ -89,4 +86,14 @@ public void deleteUser(Long userId) {
             .orElseThrow(() -> new RuntimeException("E404001: 존재하지 않는 회원입니다."));
         userRepository.delete(user);
     }
+
+    @Transactional
+    public void updateNickname(Long userId, String newNickname, HttpSession session) {
+        validateNicknameFormat(newNickname);
+        validateNicknameDuplicate(newNickname);
+
+        User user = initNickname(userId, newNickname);
+        session.setAttribute(USER, AuthenticationUser.from(user));
+        SecurityUtils.setAuthentication(user);
+    }
 }