refactor: urlEncoded 파일명 decode 로직 추가

src/main/java/ddingdong/ddingdongBE/file/controller/S3FileController.java

@@ -8,6 +8,8 @@
 import ddingdong.ddingdongBE.file.service.dto.command.GeneratePreSignedUrlRequestCommand;
 import ddingdong.ddingdongBE.file.service.dto.query.GeneratePreSignedUrlRequestQuery;
 import java.net.URL;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
 import java.time.LocalDateTime;
 import lombok.RequiredArgsConstructor;
 import org.springframework.web.bind.annotation.RestController;
@@ -22,9 +24,10 @@ public class S3FileController implements S3FileAPi {
     public UploadUrlResponse getPreSignedUrl(PrincipalDetails principalDetails, String fileName) {
         User user = principalDetails.getUser();
         LocalDateTime now = LocalDateTime.now();
+        String decodedFileName = URLDecoder.decode(fileName, StandardCharsets.UTF_8);
         GeneratePreSignedUrlRequestQuery query =
                 s3FileService.generatePresignedUrlRequest(
-                        new GeneratePreSignedUrlRequestCommand(now, user.getId(), fileName));
+                        new GeneratePreSignedUrlRequestCommand(now, user.getId(), decodedFileName));
         URL presingedUrl = s3FileService.getPresignedUrl(query.generatePresignedUrlRequest());
         return UploadUrlResponse.of(query, presingedUrl);
     }