[FEAT] pick v2 도메인 개발

backend/src/main/java/kernel360/techpick/feature/infrastructure/folder/reader/FolderReader.java

@@ -1,4 +1,9 @@
 package kernel360.techpick.feature.infrastructure.folder.reader;
 
+import kernel360.techpick.core.model.folder.Folder;
+import kernel360.techpick.core.model.user.User;
+
 public interface FolderReader {
+
+    Folder read(User user, Long folderId);
 }

backend/src/main/java/kernel360/techpick/feature/infrastructure/folder/reader/FolderReaderImpl.java

@@ -1,4 +1,25 @@
 package kernel360.techpick.feature.infrastructure.folder.reader;
 
+import org.apache.commons.lang3.ObjectUtils;
+import org.springframework.stereotype.Component;
+
+import kernel360.techpick.core.model.folder.Folder;
+import kernel360.techpick.core.model.folder.FolderRepository;
+import kernel360.techpick.core.model.user.User;
+import kernel360.techpick.feature.domain.folder.exception.ApiFolderException;
+import lombok.RequiredArgsConstructor;
+
+@Component
+@RequiredArgsConstructor
 public class FolderReaderImpl implements FolderReader {
+    FolderRepository folderRepository;
+
+    @Override
+    public Folder read(User user, Long folderId) {
+        Folder folder = folderRepository.findById(folderId).orElseThrow(ApiFolderException::FOLDER_NOT_FOUND);
+        if (ObjectUtils.notEqual(folder.getUser(), user)) {
+            throw ApiFolderException.FOLDER_ACCESS_DENIED();
+        }
+        return folder;
+    }
 }