fix: block duplicate error in image creation

스크랩당 이미지 생성 하나만 하게 수정

src/main/java/capstone/bookdiary/exception/GlobalControllerAdvice.java

@@ -3,6 +3,7 @@
 import capstone.bookdiary.exception.error.ErrorCode;
 import capstone.bookdiary.exception.exceptions.DataNotFoundException;
 import capstone.bookdiary.exception.exceptions.EmailDuplicateException;
+import capstone.bookdiary.exception.exceptions.ImageAlreadyExistException;
 import capstone.bookdiary.exception.exceptions.UserNotFoundException;
 import capstone.bookdiary.exception.response.ApiErrorResponse;
 import org.springframework.http.HttpStatus;
@@ -37,4 +38,9 @@ ResponseEntity<ApiErrorResponse> emailDuplicationExceptionHandle(EmailDuplicateE
     protected ResponseEntity handleMethodArgumentNotValidException(MethodArgumentNotValidException e) {
         return new ResponseEntity<>(e.getBindingResult().getFieldErrors().get(0).getDefaultMessage() , HttpStatus.BAD_REQUEST);
     }
+
+    @ExceptionHandler(ImageAlreadyExistException.class)
+    ResponseEntity<ApiErrorResponse> imageAlreadyExistException(ImageAlreadyExistException e){
+        return ApiErrorResponse.toResponseEntity(e.getErrorCode());
+    }
 }

src/main/java/capstone/bookdiary/exception/error/ErrorCode.java

@@ -11,7 +11,8 @@ public enum ErrorCode {
     EMAIL_DUPLICATE(HttpStatus.CONFLICT, "해당 이메일은 이미 존재합니다."),
     DATA_NOT_FOUND(HttpStatus.NOT_FOUND, "해당 데이터가 존재하지 않습니다."),
     UNAUTHORIZED(HttpStatus.UNAUTHORIZED, "접근 권한이 없습니다."),
-    API_REQUEST_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "도서관 정보나루 API에 문제가 있습니다");
+    API_REQUEST_ERROR(HttpStatus.INTERNAL_SERVER_ERROR, "외부 API 호출에 문제가 있습니다"),
+    IMAGE_ALREADY_EXIST(HttpStatus.CONFLICT, "해당 스크랩은 이미 이미지가 생성 됐습니다.");
 
     private final HttpStatus httpStatus;
     private final String message;

src/main/java/capstone/bookdiary/exception/exceptions/ImageAlreadyExistException.java

@@ -0,0 +1,14 @@
+package capstone.bookdiary.exception.exceptions;
+
+import capstone.bookdiary.exception.error.ErrorCode;
+
+public class ImageAlreadyExistException extends CustomException{
+    public ImageAlreadyExistException() {
+        super(ErrorCode.IMAGE_ALREADY_EXIST);
+    }
+
+    @Override
+    public ErrorCode getErrorCode() {
+        return super.getErrorCode();
+    }
+}

src/main/java/capstone/bookdiary/service/ImageService.java

@@ -5,11 +5,13 @@
 import capstone.bookdiary.domain.entity.Image;
 import capstone.bookdiary.domain.entity.Scrap;
 import capstone.bookdiary.exception.exceptions.DataNotFoundException;
+import capstone.bookdiary.exception.exceptions.ImageAlreadyExistException;
 import capstone.bookdiary.feign.ImageClient;
 import capstone.bookdiary.repository.ImageRepository;
 import capstone.bookdiary.repository.ScrapRepository;
 import java.util.HashMap;
 import java.util.Map;
+import java.util.Optional;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
 
@@ -22,20 +24,28 @@ public class ImageService {
 
     public Map<String, Object> generateImage(ImageRequestDto imageRequestDto) {
         Map<String, String> data = new HashMap<>();
-        String messageString = imageRequestDto.getContent() + " " + imageRequestDto.getMemo();
-        data.put("message", messageString);
-
-        //AI로 전송 using FeignClient
-        ImageResponseDto imageResponseDto = imageClient.getImageUrl(data);
-        String imageUrl = imageResponseDto.getBody().substring(1, imageResponseDto.getBody().length() - 1);
 
         Scrap scrap = scrapRepository.findById(imageRequestDto.getScrapId())
                 .orElseThrow(DataNotFoundException::new);
-        Image savedImage = imageRepository.save(new Image(scrap, imageUrl));
+        Optional<Image> optionalImage = imageRepository.findByScrap(scrap);
+
+        if(optionalImage.isPresent()){
+            throw new ImageAlreadyExistException();
+        }else{
+            String messageString = imageRequestDto.getContent() + " " + imageRequestDto.getMemo();
+            data.put("message", messageString);
+
+            //AI로 전송 using FeignClient
+            ImageResponseDto imageResponseDto = imageClient.getImageUrl(data);
+            String imageUrl = imageResponseDto.getBody().substring(1, imageResponseDto.getBody().length() - 1);
+
+            Image savedImage = imageRepository.save(new Image(scrap, imageUrl));
+            Map<String, Object> response = new HashMap<>();
+            response.put("imageId", savedImage.getImageId());
+            response.put("imageUrl", savedImage.getImageUrl());
 
-        //return: DB에 저장된 ImageId
-        Map<String, Object> response = new HashMap<>();
-        response.put("imageId", savedImage.getImageId());
-        return response;
+            //return: DB에 저장된 ImageId
+            return response;
+        }
     }
 }