✨Feat: 비밀번호 변경 구현

src/main/java/com/be/sportizebe/domain/user/controller/UserController.java

@@ -1,5 +1,6 @@
 package com.be.sportizebe.domain.user.controller;
 
+import com.be.sportizebe.domain.user.dto.request.ChangePasswordRequest;
 import com.be.sportizebe.domain.user.dto.request.SignUpRequest;
 import com.be.sportizebe.domain.user.dto.request.UpdateProfileRequest;
 import com.be.sportizebe.domain.user.dto.response.ProfileImageResponse;
@@ -64,4 +65,14 @@ public ResponseEntity<BaseResponse<UserInfoResponse>> getMyInfo(
         UserInfoResponse response = userService.getUserInfo(userAuthInfo.getId());
         return ResponseEntity.ok(BaseResponse.success("사용자 정보 조회 성공", response));
     }
+
+    @PutMapping("/password")
+    @Operation(summary = "비밀번호 변경", description = "현재 비밀번호를 확인 후 새 비밀번호로 변경합니다.")
+    public ResponseEntity<BaseResponse<Void>> changePassword(
+        @AuthenticationPrincipal UserAuthInfo userAuthInfo,
+        @RequestBody @Valid ChangePasswordRequest request
+    ) {
+        userService.changePassword(userAuthInfo.getId(), request);
+        return ResponseEntity.ok(BaseResponse.success("비밀번호 변경 성공", null));
+    }
 }

src/main/java/com/be/sportizebe/domain/user/dto/request/ChangePasswordRequest.java

@@ -0,0 +1,18 @@
+package com.be.sportizebe.domain.user.dto.request;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+@Schema(description = "비밀번호 변경 요청")
+public record ChangePasswordRequest(
+    @Schema(description = "현재 비밀번호")
+    @NotBlank(message = "현재 비밀번호는 필수입니다.")
+    String currentPassword,
+
+    @Schema(description = "새 비밀번호")
+    @NotBlank(message = "새 비밀번호는 필수입니다.")
+    @Size(min = 8, max = 20, message = "비밀번호는 8자 이상 20자 이하로 입력해주세요.")
+    String newPassword
+) {
+}

src/main/java/com/be/sportizebe/domain/user/entity/User.java

@@ -80,4 +80,8 @@ public void updateProfile(String nickname, String introduce) {
         this.nickname = nickname;
         this.introduce = introduce;
     }
+
+    public void updatePassword(String encodedPassword) {
+        this.password = encodedPassword;
+    }
 }

src/main/java/com/be/sportizebe/domain/user/exception/UserErrorCode.java

@@ -18,7 +18,9 @@ public enum UserErrorCode implements BaseErrorCode {
   USER_NOT_FOUND("USER_0005", "회원을 찾을 수 없습니다.", HttpStatus.NOT_FOUND),
 
   USER_DELETE_FAILED("USER_0006", "사용자 삭제에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
-  S3_DELETE_FAILED("USER_0007", "S3 이미지 삭제에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR);
+  S3_DELETE_FAILED("USER_0007", "S3 이미지 삭제에 실패했습니다.", HttpStatus.INTERNAL_SERVER_ERROR),
+  CURRENT_PASSWORD_MISMATCH("USER_0009", "현재 비밀번호가 일치하지 않습니다.", HttpStatus.BAD_REQUEST),
+  SAME_PASSWORD("USER_0010", "새 비밀번호는 현재 비밀번호와 달라야 합니다.", HttpStatus.BAD_REQUEST);
 
   private final String code;
   private final String message;

src/main/java/com/be/sportizebe/domain/user/service/UserService.java

@@ -1,5 +1,6 @@
 package com.be.sportizebe.domain.user.service;
 
+import com.be.sportizebe.domain.user.dto.request.ChangePasswordRequest;
 import com.be.sportizebe.domain.user.dto.request.SignUpRequest;
 import com.be.sportizebe.domain.user.dto.request.UpdateProfileRequest;
 import com.be.sportizebe.domain.user.dto.response.ProfileImageResponse;
@@ -21,4 +22,7 @@ public interface UserService {
 
   // 사용자 정보 조회
   UserInfoResponse getUserInfo(Long userId);
+
+  // 비밀번호 변경
+  void changePassword(Long userId, ChangePasswordRequest request);
 }

src/main/java/com/be/sportizebe/domain/user/service/UserServiceImpl.java

@@ -1,5 +1,6 @@
 package com.be.sportizebe.domain.user.service;
 
+import com.be.sportizebe.domain.user.dto.request.ChangePasswordRequest;
 import com.be.sportizebe.domain.user.dto.request.SignUpRequest;
 import com.be.sportizebe.domain.user.dto.request.UpdateProfileRequest;
 import com.be.sportizebe.domain.user.dto.response.ProfileImageResponse;
@@ -27,7 +28,7 @@
 public class UserServiceImpl implements UserService {
 
     private final UserRepository userRepository;
-    private final PasswordEncoder passwordEncoder;
+    private final PasswordEncoder passwordEncoder; // 비밀번호 인코딩 목적
     private final UserCacheService userCacheService;
     private final S3Service s3Service;
 
@@ -119,4 +120,27 @@ public UserInfoResponse getUserInfo(Long userId) {
 
         return UserInfoResponse.from(userAuthInfo);
     }
+
+    @Override
+    @Transactional
+    public void changePassword(Long userId, ChangePasswordRequest request) {
+        User user = userRepository.findById(userId)
+            .orElseThrow(() -> new CustomException(UserErrorCode.USER_NOT_FOUND));
+
+        // 현재 비밀번호 확인
+        if (!passwordEncoder.matches(request.currentPassword(), user.getPassword())) {
+            throw new CustomException(UserErrorCode.CURRENT_PASSWORD_MISMATCH);
+        }
+
+        // 새 비밀번호가 현재 비밀번호와 동일한지 확인
+        if (passwordEncoder.matches(request.newPassword(), user.getPassword())) {
+            throw new CustomException(UserErrorCode.SAME_PASSWORD);
+        }
+
+        // 비밀번호 변경
+        String encodedNewPassword = passwordEncoder.encode(request.newPassword());
+        user.updatePassword(encodedNewPassword);
+
+        log.info("사용자 비밀번호 변경 완료: userId={}", userId);
+    }
 }