Feat: 팔로잉/팔로잉 취소 api

src/main/java/EatPic/spring/domain/user/controller/UserRestController.java

@@ -12,6 +12,7 @@
 @RestController
 @RequiredArgsConstructor
 @RequestMapping("/api/users")
+@Tag(name = "User", description = "사용자 관련 API")
 public class UserRestController {
     private final UserService userService;
 
@@ -38,8 +39,19 @@ public ApiResponse<UserResponseDTO.ProfileDto> myIcon(HttpServletRequest request
     @Operation(summary = "해당 프로필의 유저를 차단 목록에 추가합니다.")
     @PostMapping("/{userId}/profile/block")
     @Tag(name = "User", description = "사용자 관련 API")
-    public ApiResponse<UserResponseDTO.UserBlockResponseDto> blockUser(HttpServletRequest request,@PathVariable Long userId) {
+    public ApiResponse<UserResponseDTO.UserActionResponseDto> blockUser(HttpServletRequest request, @PathVariable Long userId) {
         return ApiResponse.onSuccess(userService.blockUser(request,userId));
     }
 
+    @Operation(summary = "팔로잉")
+    @PostMapping("/follow/{userId}")
+    public ApiResponse<UserResponseDTO.UserActionResponseDto> followUser(HttpServletRequest request, @PathVariable Long userId) {
+        return ApiResponse.onSuccess(userService.followUser(request,userId));
+    }
+    @Operation(summary = "팔로잉 취소")
+    @DeleteMapping("/follow/{userId}")
+    public ApiResponse<UserResponseDTO.UserActionResponseDto> unfollowUser(HttpServletRequest request, @PathVariable Long userId) {
+        return ApiResponse.onSuccess(userService.unfollowUser(request,userId));
+    }
+
 }

src/main/java/EatPic/spring/domain/user/converter/UserConverter.java

@@ -83,10 +83,17 @@ public static SearchResponseDTO.GetAccountResponseDto toAccountDto(User user) {
                 .build();
     }
 
-    public static UserResponseDTO.UserBlockResponseDto toUserBlockResponseDto(UserBlock userBlock) {
-        return UserResponseDTO.UserBlockResponseDto.builder()
+    public static UserResponseDTO.UserActionResponseDto toUserActionResponseDto(UserBlock userBlock) {
+        return UserResponseDTO.UserActionResponseDto.builder()
                 .userId(userBlock.getUser().getId())
                 .targetUserId(userBlock.getBlockedUser().getId())
                 .build();
     }
+
+    public static UserResponseDTO.UserActionResponseDto toUserActionResponseDto(UserFollow userFollow) {
+        return UserResponseDTO.UserActionResponseDto.builder()
+                .userId(userFollow.getUser().getId())
+                .targetUserId(userFollow.getTargetUser().getId())
+                .build();
+    }
 }

src/main/java/EatPic/spring/domain/user/dto/response/UserResponseDTO.java

@@ -36,9 +36,11 @@ public static class UserIconListResponseDto{
     @Builder
     @AllArgsConstructor
     @NoArgsConstructor
-    public static class UserBlockResponseDto{
+    public static class UserActionResponseDto {
         Long userId;
         Long targetUserId;
     }
 
+
+
 }

src/main/java/EatPic/spring/domain/user/repository/UserFollowRepository.java

@@ -21,4 +21,6 @@ public interface UserFollowRepository extends JpaRepository<UserFollow,Long> {
         WHERE uf.user.id = :userId
     """)
     List<Long> findFollowingUserIds(@Param("userId") Long userId);
+
+    UserFollow findByUserAndTargetUser(User user, User target);
 }

src/main/java/EatPic/spring/domain/user/service/UserService.java

@@ -15,12 +15,13 @@ public interface UserService {
     LoginResponseDTO loginUser(LoginRequestDTO request);
     UserResponseDTO.UserIconListResponseDto followingUserIconList(HttpServletRequest request, int page, int size);
     UserResponseDTO.ProfileDto getMyIcon(HttpServletRequest request);
-    UserResponseDTO.UserBlockResponseDto blockUser(HttpServletRequest request,Long targetUserId);
+    UserResponseDTO.UserActionResponseDto blockUser(HttpServletRequest request, Long targetUserId);
     boolean isEmailDuplicate(String email);
     boolean isnameIdDuplicate(String nameId);
     // UserQueryService
     UserInfoDTO getUserInfo(HttpServletRequest request);
-
+    UserResponseDTO.UserActionResponseDto followUser(HttpServletRequest request, Long targetUserId);
+    UserResponseDTO.UserActionResponseDto unfollowUser(HttpServletRequest request, Long targetUserId);
     User getLoginUser(HttpServletRequest request);
 }
 

src/main/java/EatPic/spring/domain/user/service/UserServiceImpl.java

@@ -23,14 +23,13 @@
 import org.springframework.data.domain.PageRequest;
 import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
 import org.springframework.security.core.Authentication;
-import org.springframework.security.core.userdetails.UserDetailsService;
 import org.springframework.security.crypto.password.PasswordEncoder;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
 
 import java.util.Collections;
 
-import static EatPic.spring.global.common.code.status.ErrorStatus.USER_NOT_FOUND;
+import static EatPic.spring.global.common.code.status.ErrorStatus.*;
 
 @Service
 @RequiredArgsConstructor
@@ -147,7 +146,7 @@ public UserResponseDTO.ProfileDto getMyIcon(HttpServletRequest request) {
 
     // 유저 차단
     @Transactional
-    public UserResponseDTO.UserBlockResponseDto blockUser(HttpServletRequest request,Long targetUserId) {
+    public UserResponseDTO.UserActionResponseDto blockUser(HttpServletRequest request, Long targetUserId) {
         User user = getLoginUser(request);
         User targetUser = userRepository.findById(targetUserId)
                 .orElseThrow(() -> new ExceptionHandler(USER_NOT_FOUND));
@@ -159,7 +158,7 @@ public UserResponseDTO.UserBlockResponseDto blockUser(HttpServletRequest request
 
         userBlockRepository.save(userBlock);
 
-        return UserConverter.toUserBlockResponseDto(userBlock);
+        return UserConverter.toUserActionResponseDto(userBlock);
     }
 
     // 이메일 중복 검사
@@ -180,4 +179,34 @@ public User getLoginUser(HttpServletRequest request) {
         return userRepository.findByEmail(email)
                 .orElseThrow(() -> new ExceptionHandler(ErrorStatus.MEMBER_NOT_FOUND));
     }
+
+    @Override
+    public UserResponseDTO.UserActionResponseDto unfollowUser(HttpServletRequest request, Long targetUserId) {
+        User user = getLoginUser(request);
+        User target = userRepository.findUserById(targetUserId);
+
+        UserFollow prev = userFollowRepository.findByUserAndTargetUser(user,target);
+        if(prev == null) {
+            throw new ExceptionHandler(ErrorStatus.FOLLOW_NOT_EXISTS);
+        }
+
+        UserFollow follow = UserFollow.builder().user(user).targetUser(target).build();
+        userFollowRepository.delete(follow);
+        return UserConverter.toUserActionResponseDto(follow);
+    }
+
+    @Override
+    public UserResponseDTO.UserActionResponseDto followUser(HttpServletRequest request, Long targetUserId) {
+        User user = getLoginUser(request);
+        User target = userRepository.findUserById(targetUserId);
+
+        UserFollow prev = userFollowRepository.findByUserAndTargetUser(user,target);
+        UserFollow follow = UserFollow.builder().user(user).targetUser(target).build();
+        if(prev!=null && prev.getTargetUser().getId().equals(targetUserId)) {
+            throw new ExceptionHandler(FOLLOW_ALREADY_EXISTS);
+        }
+
+        userFollowRepository.save(follow);
+        return UserConverter.toUserActionResponseDto(follow);
+    }
 }

src/main/java/EatPic/spring/global/common/code/status/ErrorStatus.java

@@ -57,7 +57,11 @@ public enum ErrorStatus implements BaseErrorCode {
     MEMBER_NOT_FOUND(HttpStatus.BAD_REQUEST, "USER_404", "사용자가 없습니다."),
     INVALID_PASSWORD(HttpStatus.BAD_REQUEST, "USER_401", "비밀번호가 불일치합니다."),
     INVALID_TOKEN(HttpStatus.BAD_REQUEST, "USER_403", "유효하지 않은 토큰입니다."),
-    DUPLICATE_JOIN_REQUEST(HttpStatus.BAD_REQUEST, "USER_400", "해당 이메일로 이미 가입된 사용자가 존재합니다.");
+    DUPLICATE_JOIN_REQUEST(HttpStatus.BAD_REQUEST, "USER_400", "해당 이메일로 이미 가입된 사용자가 존재합니다."),
+
+    // 팔로우 관련 응답
+    FOLLOW_ALREADY_EXISTS(HttpStatus.BAD_REQUEST, "FOLLOW_001", "이미 팔로잉 중입니다"),
+    FOLLOW_NOT_EXISTS(HttpStatus.BAD_REQUEST, "FOLLOW_002", "팔로우 기록이 없습니다");
 
     private final HttpStatus httpStatus;
     private final String code;