초대코드 조회 API 구현

src/main/java/com/petlog/docs/PetGroupControllerDocs.java

@@ -35,7 +35,7 @@ public interface PetGroupControllerDocs {
 
     @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "초대코드 조회에 성공하였습니다.")
     @Operation(summary = "초대코드 조회 API")
-    ResponseEntity<ApiResponse<GetJoinCodeResponseDto>> getJoinCode(@PathVariable final Long groupId);
+    ResponseEntity<ApiResponse<GetJoinCodeResponseDto>> getJoinCode(@Authenticated final Long memberId, @PathVariable final Long groupId);
 
     @io.swagger.v3.oas.annotations.responses.ApiResponse(responseCode = "200", description = "참고사항 조회에 성공하였습니다.")
     @Operation(summary = "참고사항 조회 API")

src/main/java/com/petlog/petgroup/controller/PetGroupController.java

@@ -11,6 +11,7 @@
 import com.petlog.petgroup.controller.dto.response.GetNoteResponseDto;
 import com.petlog.petgroup.service.PetGroupService;
 import com.petlog.petgroup.service.dto.CreatePetGroupDto;
+import com.petlog.petgroup.service.dto.GetJoinCodeDto;
 import com.petlog.petgroup.service.dto.GetMyPetGroupDto;
 import lombok.RequiredArgsConstructor;
 import org.springframework.http.ResponseEntity;
@@ -89,9 +90,11 @@ public ResponseEntity<ApiResponse<Void>> leavePetGroup(
 
     @GetMapping("/{groupId}/invite")
     public ResponseEntity<ApiResponse<GetJoinCodeResponseDto>> getJoinCode(
+        @Authenticated final Long memberId,
         @PathVariable final Long groupId
     ) {
-        final GetJoinCodeResponseDto response = new GetJoinCodeResponseDto("123ABC");
+        final GetJoinCodeDto dto = petGroupService.getPetGroupJoinCode(memberId, groupId);
+        final GetJoinCodeResponseDto response = new GetJoinCodeResponseDto(dto.joinCode());
 
         return ResponseEntity.ok(
             ApiResponse.successWithData(GET_JOIN_CODE, response)

src/main/java/com/petlog/petgroup/controller/dto/response/GetJoinCodeResponseDto.java

@@ -8,8 +8,4 @@ public record GetJoinCodeResponseDto(
     String joinCode
 
 ) {
-
-    public GetJoinCodeResponseDto(final String joinCode) {
-        this.joinCode = joinCode;
-    }
 }

src/main/java/com/petlog/petgroup/repository/PetGroupMemberRepository.java

@@ -1,5 +1,7 @@
 package com.petlog.petgroup.repository;
 
+import com.petlog.member.entity.Member;
+import com.petlog.petgroup.entity.PetGroup;
 import com.petlog.petgroup.entity.PetGroupMember;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.data.jpa.repository.Modifying;
@@ -23,4 +25,6 @@ public interface PetGroupMemberRepository extends JpaRepository<PetGroupMember,
         AND pgm.petGroup.id = :groupId
     """)
     void deleteByMemberIdAndGroupId(final Long memberId, final Long groupId);
+
+    boolean existsByMemberAndPetGroup(final Member member, final PetGroup group);
 }

src/main/java/com/petlog/petgroup/service/PetGroupService.java

@@ -15,6 +15,7 @@
 import com.petlog.petgroup.repository.PetGroupMemberRepository;
 import com.petlog.petgroup.repository.PetGroupRepository;
 import com.petlog.petgroup.service.dto.CreatePetGroupDto;
+import com.petlog.petgroup.service.dto.GetJoinCodeDto;
 import com.petlog.petgroup.service.dto.GetMyPetGroupDto;
 import lombok.RequiredArgsConstructor;
 import org.springframework.stereotype.Service;
@@ -117,4 +118,23 @@ private void validatePetGroupIsExist(final Long petGroupId) {
         petGroupRepository.findById(petGroupId)
             .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 그룹입니다."));
     }
+
+    public GetJoinCodeDto getPetGroupJoinCode(final Long memberId, final Long groupId) {
+        final Member member = getMember(memberId);
+        final PetGroup petGroup = getPetGroup(groupId);
+        validateMemberInPetGroup(member, petGroup);
+
+        return new GetJoinCodeDto(petGroup.getJoinCode());
+    }
+
+    private PetGroup getPetGroup(final Long groupId) {
+        return petGroupRepository.findById(groupId)
+            .orElseThrow(() -> new IllegalArgumentException("존재하지 않는 그룹입니다."));
+    }
+
+    private void validateMemberInPetGroup(final Member member, final PetGroup petGroup) {
+        if(!petGroupMemberRepository.existsByMemberAndPetGroup(member, petGroup)) {
+            throw new IllegalArgumentException("그룹에 존재하지 않는 회원입니다.");
+        }
+    }
 }

src/main/java/com/petlog/petgroup/service/dto/GetJoinCodeDto.java

@@ -0,0 +1,8 @@
+package com.petlog.petgroup.service.dto;
+
+public record GetJoinCodeDto(
+
+    String joinCode
+
+) {
+}