Feat: [FN-297] 그룹 조회 API 구현

src/main/java/flipnote/group/adapter/in/web/GroupController.java

@@ -1,6 +1,7 @@
 package flipnote.group.adapter.in.web;
 
 import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
 import org.springframework.web.bind.annotation.PathVariable;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.PutMapping;
@@ -13,10 +14,13 @@
 import flipnote.group.api.dto.request.CreateGroupRequestDto;
 import flipnote.group.api.dto.response.ChangeGroupResponseDto;
 import flipnote.group.api.dto.response.CreateGroupResponseDto;
+import flipnote.group.api.dto.response.FindGroupResponseDto;
 import flipnote.group.application.port.in.ChangeGroupUseCase;
 import flipnote.group.application.port.in.CreateGroupUseCase;
+import flipnote.group.application.port.in.FindGroupUseCase;
 import flipnote.group.application.port.in.command.ChangeGroupCommand;
 import flipnote.group.application.port.in.command.CreateGroupCommand;
+import flipnote.group.application.port.in.command.FindGroupCommand;
 import jakarta.validation.Valid;
 import lombok.RequiredArgsConstructor;
 
@@ -27,6 +31,7 @@ public class GroupController {
 
 	private final CreateGroupUseCase createGroupUseCase;
 	private final ChangeGroupUseCase changeGroupUseCase;
+	private final FindGroupUseCase findGroupUseCase;
 
 	/**
 	 * 그룹 생성 API
@@ -86,4 +91,24 @@ public ResponseEntity<ChangeGroupResponseDto> changeGroup(
 		return ResponseEntity.ok(res);
 	}
 
+	/**
+	 * 그룹 상세 조회 API
+	 * @param userId
+	 * @param groupId
+	 * @return
+	 */
+	@GetMapping("/{groupId}")
+	public ResponseEntity<FindGroupResponseDto> findGroup(
+		@RequestHeader("X-USER-ID") Long userId,
+		@PathVariable("groupId") Long groupId) {
+
+		FindGroupCommand cmd = new FindGroupCommand(userId, groupId);
+
+		var result = findGroupUseCase.findGroup(cmd);
+
+		FindGroupResponseDto res = FindGroupResponseDto.from(result);
+
+		return ResponseEntity.ok(res);
+	}
+
 }

src/main/java/flipnote/group/adapter/out/persistence/GroupRepositoryAdapter.java

@@ -35,29 +35,4 @@ public Group findById(Long id) {
 		);
 		return GroupMapper.toDomain(groupEntity);
 	}
-
-	/**
-	 * 그룹 수정
-	 * @param group
-	 */
-	@Override
-	public Group update(Group group) {
-
-		GroupEntity groupEntity = groupRepository.findById(group.getId()).orElseThrow(
-			() -> new IllegalArgumentException("group not Exist")
-		);
-
-		groupEntity.change(
-			group.getName(),
-			group.getCategory(),
-			group.getDescription(),
-			group.getJoinPolicy(),
-			group.getVisibility(),
-			group.getMaxMember(),
-			group.getImageRefId()
-		);
-
-		return GroupMapper.toDomain(groupEntity);
-	}
-
 }

src/main/java/flipnote/group/api/dto/response/ChangeGroupResponseDto.java

@@ -9,6 +9,8 @@
 import flipnote.group.domain.model.group.Visibility;
 
 public record ChangeGroupResponseDto(
+	Long groupId,
+
 	String name,
 
 	Category category,
@@ -32,6 +34,7 @@ public static ChangeGroupResponseDto from(ChangeGroupResult result) {
 		Group group = result.group();
 
 		return new ChangeGroupResponseDto(
+			group.getId(),
 			group.getName(),
 			group.getCategory(),
 			group.getDescription(),

src/main/java/flipnote/group/api/dto/response/FindGroupResponseDto.java

@@ -0,0 +1,49 @@
+package flipnote.group.api.dto.response;
+
+import java.time.LocalDateTime;
+
+import flipnote.group.application.port.in.result.FindGroupResult;
+import flipnote.group.domain.model.group.Category;
+import flipnote.group.domain.model.group.Group;
+import flipnote.group.domain.model.group.JoinPolicy;
+import flipnote.group.domain.model.group.Visibility;
+
+public record FindGroupResponseDto(
+	Long groupId,
+
+	String name,
+
+	Category category,
+
+	String description,
+
+	JoinPolicy joinPolicy,
+
+	Visibility visibility,
+
+	Integer maxMember,
+
+	Long imageRefId,
+
+	LocalDateTime createdAt,
+
+	LocalDateTime modifiedAt
+) {
+	public static FindGroupResponseDto from(FindGroupResult result) {
+
+		Group group = result.group();
+
+		return new FindGroupResponseDto(
+			group.getId(),
+			group.getName(),
+			group.getCategory(),
+			group.getDescription(),
+			group.getJoinPolicy(),
+			group.getVisibility(),
+			group.getMaxMember(),
+			group.getImageRefId(),
+			group.getCreatedAt(),
+			group.getModifiedAt()
+		);
+	}
+}

src/main/java/flipnote/group/application/port/in/FindGroupUseCase.java

@@ -0,0 +1,8 @@
+package flipnote.group.application.port.in;
+
+import flipnote.group.application.port.in.command.FindGroupCommand;
+import flipnote.group.application.port.in.result.FindGroupResult;
+
+public interface FindGroupUseCase {
+	FindGroupResult findGroup(FindGroupCommand cmd);
+}

src/main/java/flipnote/group/application/port/in/command/FindGroupCommand.java

@@ -0,0 +1,7 @@
+package flipnote.group.application.port.in.command;
+
+public record FindGroupCommand(
+	Long userId,
+	Long groupId
+) {
+}

src/main/java/flipnote/group/application/port/in/result/FindGroupResult.java

@@ -0,0 +1,7 @@
+package flipnote.group.application.port.in.result;
+
+import flipnote.group.domain.model.group.Group;
+
+public record FindGroupResult(
+	Group group
+) { }

src/main/java/flipnote/group/application/port/out/GroupRepositoryPort.java

@@ -6,6 +6,4 @@ public interface GroupRepositoryPort {
     Long saveNewGroup(Group group);
 
     Group findById(Long id);
-
-    Group update(Group group);
 }

src/main/java/flipnote/group/application/service/ChangeGroupService.java

@@ -10,8 +10,6 @@
 import flipnote.group.application.port.in.ChangeGroupUseCase;
 import flipnote.group.application.port.in.command.ChangeGroupCommand;
 import flipnote.group.application.port.in.result.ChangeGroupResult;
-import flipnote.group.application.port.out.GroupRepositoryPort;
-import flipnote.group.domain.model.group.Group;
 import flipnote.group.infrastructure.persistence.jpa.GroupRepository;
 import lombok.RequiredArgsConstructor;
 

src/main/java/flipnote/group/application/service/FindGroupService.java

@@ -0,0 +1,34 @@
+package flipnote.group.application.service;
+
+import java.util.Optional;
+
+import org.springframework.stereotype.Service;
+
+import flipnote.group.adapter.out.entity.GroupEntity;
+import flipnote.group.adapter.out.persistence.mapper.GroupMapper;
+import flipnote.group.application.port.in.FindGroupUseCase;
+import flipnote.group.application.port.in.command.FindGroupCommand;
+import flipnote.group.application.port.in.result.FindGroupResult;
+import flipnote.group.application.port.out.GroupRepositoryPort;
+import flipnote.group.domain.model.group.Group;
+import lombok.RequiredArgsConstructor;
+
+@Service
+@RequiredArgsConstructor
+public class FindGroupService implements FindGroupUseCase {
+
+	private final GroupRepositoryPort groupRepository;
+
+	/**
+	 * 하나의 그룹에 대한 정보 조회
+	 * @param cmd
+	 * @return
+	 */
+	@Override
+	public FindGroupResult findGroup(FindGroupCommand cmd) {
+
+		Group group = groupRepository.findById(cmd.groupId());
+
+		return new FindGroupResult(group);
+	}
+}