공유된 스페이스의 정보 조회 (스페이스 이름)

src/main/java/com/example/gp_backend_data/space/controller/SharedSpaceController.java

@@ -0,0 +1,28 @@
+package com.example.gp_backend_data.space.controller;
+
+import com.example.gp_backend_data.space.domain.dto.response.SharedSpaceResponse;
+import com.example.gp_backend_data.space.service.SharedSpaceService;
+import jakarta.persistence.EntityNotFoundException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.*;
+
+import java.util.UUID;
+
+@RestController
+@RequestMapping("/share")
+@RequiredArgsConstructor
+public class SharedSpaceController {
+
+    private final SharedSpaceService sharedSpaceService;
+
+    @GetMapping("/{sharingId}/space")
+    public ResponseEntity<SharedSpaceResponse> getSharedSpaceInfo(@PathVariable UUID sharingId) {
+        try {
+            SharedSpaceResponse response = sharedSpaceService.getSharedSpaceInfo(sharingId);
+            return ResponseEntity.ok(response);
+        } catch (EntityNotFoundException e) {
+            throw new EntityNotFoundException("404 Not Found: " + e.getMessage());
+        }
+    }
+}

src/main/java/com/example/gp_backend_data/space/domain/dto/response/SharedSpaceResponse.java

@@ -0,0 +1,12 @@
+package com.example.gp_backend_data.space.domain.dto.response;
+
+import lombok.*;
+
+@Getter
+@Setter
+@NoArgsConstructor
+@AllArgsConstructor
+@Builder
+public class SharedSpaceResponse {
+    private String title;
+}

src/main/java/com/example/gp_backend_data/space/repository/SpaceRepository.java

@@ -14,4 +14,5 @@ public interface SpaceRepository extends JpaRepository<Space, byte[]> {
     Optional<Space> findBySpaceIdAndUserId(byte[] spaceId, byte[] userId);
     List<Space> findByUserId(byte[] userId);
     Optional<Space> findBySharingIdAndIsShared(byte[] sharingId, boolean isShared);
+    Optional<Space> findBySharingId(byte[] sharingId);
 }

src/main/java/com/example/gp_backend_data/space/service/SharedSpaceService.java

@@ -0,0 +1,32 @@
+package com.example.gp_backend_data.space.service;
+
+import com.example.gp_backend_data.space.domain.dto.response.SharedSpaceResponse;
+import com.example.gp_backend_data.space.domain.entity.Space;
+import com.example.gp_backend_data.space.repository.SpaceRepository;
+import com.example.gp_backend_data.utils.UUIDHelper;
+import jakarta.persistence.EntityNotFoundException;
+import lombok.RequiredArgsConstructor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.UUID;
+
+@Service
+@RequiredArgsConstructor
+@Transactional
+public class SharedSpaceService {
+
+    private final SpaceRepository spaceRepository;
+    private final UUIDHelper uuidHelper;
+
+    @Transactional(readOnly = true)
+    public SharedSpaceResponse getSharedSpaceInfo(UUID sharingId) {
+        Space space = spaceRepository.findBySharingId(
+                uuidHelper.convertUUIDToByteArray(sharingId))
+                .orElseThrow(() -> new EntityNotFoundException("Shared space not found."));
+
+        return SharedSpaceResponse.builder()
+                .title(space.getTitle())
+                .build();
+    }
+}