[SAMBAD-275] 모임 코드 조회 API 추가 (#124)

src/main/java/org/depromeet/sambad/moring/meeting/meeting/application/MeetingService.java

@@ -57,6 +57,11 @@ public MeetingNameResponse getMeetingNameByCode(String code) {
 		return MeetingNameResponse.from(meeting);
 	}
 
+	public Meeting getMeeting(Long meetingId) {
+		return meetingRepository.findById(meetingId)
+			.orElseThrow(MeetingNotFoundException::new);
+	}
+
 	private void addTypesToMeeting(MeetingPersistRequest request, Meeting meeting) {
 		List<TypesPerMeeting> types = meetingTypeRepository.findByIdIn(request.meetingTypeIds())
 			.stream()

src/main/java/org/depromeet/sambad/moring/meeting/meeting/presentation/MeetingController.java

@@ -9,20 +9,23 @@
 import org.depromeet.sambad.moring.meeting.meeting.domain.Meeting;
 import org.depromeet.sambad.moring.meeting.meeting.domain.MeetingType;
 import org.depromeet.sambad.moring.meeting.meeting.presentation.request.MeetingPersistRequest;
+import org.depromeet.sambad.moring.meeting.meeting.presentation.response.MeetingCodeResponse;
+import org.depromeet.sambad.moring.meeting.meeting.presentation.response.MeetingNameResponse;
 import org.depromeet.sambad.moring.meeting.meeting.presentation.response.MeetingPersistResponse;
 import org.depromeet.sambad.moring.meeting.meeting.presentation.response.MeetingResponse;
-import org.depromeet.sambad.moring.meeting.meeting.presentation.response.MeetingNameResponse;
 import org.depromeet.sambad.moring.meeting.meeting.presentation.response.MeetingTypeResponse;
 import org.depromeet.sambad.moring.user.presentation.resolver.UserId;
 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.RequestBody;
 import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RequestParam;
 import org.springframework.web.bind.annotation.RestController;
 
 import io.swagger.v3.oas.annotations.Operation;
+import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.responses.ApiResponse;
 import io.swagger.v3.oas.annotations.responses.ApiResponses;
 import io.swagger.v3.oas.annotations.tags.Tag;
@@ -41,6 +44,7 @@ public class MeetingController {
 	@Operation(summary = "모임 조회", description = "가입되어 있는 모임 목록을 조회합니다.")
 	@ApiResponses({
 		@ApiResponse(responseCode = "200", description = "모임 조회 성공"),
+		@ApiResponse(responseCode = "404", description = "NOT_JOINED_ANY_MEETING"),
 	})
 	@GetMapping
 	public ResponseEntity<MeetingResponse> getMeetings(@UserId Long userId) {
@@ -61,6 +65,21 @@ public ResponseEntity<MeetingNameResponse> getMeetingName(@RequestParam String c
 		return ResponseEntity.ok(response);
 	}
 
+	@Operation(summary = "모임의 초대 코드 조회", description = "특정 모임의 초대 코드를 조회합니다.")
+	@ApiResponses({
+		@ApiResponse(responseCode = "200", description = "초대 코드 조회 성공"),
+		@ApiResponse(responseCode = "404", description = "MEETING_NOT_FOUND"),
+	})
+	@GetMapping("/{meetingId}/code")
+	public ResponseEntity<MeetingCodeResponse> getMeetingCode(
+		@Parameter(description = "모임 ID", example = "1", required = true) @PathVariable Long meetingId
+	) {
+		Meeting meeting = meetingService.getMeeting(meetingId);
+		MeetingCodeResponse response = MeetingCodeResponse.from(meeting);
+
+		return ResponseEntity.ok(response);
+	}
+
 	@Operation(summary = "모임 생성", description = "모임을 생성합니다.")
 	@ApiResponses({
 		@ApiResponse(responseCode = "201", description = "모임 생성 성공"),

src/main/java/org/depromeet/sambad/moring/meeting/meeting/presentation/response/MeetingCodeResponse.java

@@ -0,0 +1,16 @@
+package org.depromeet.sambad.moring.meeting.meeting.presentation.response;
+
+import static io.swagger.v3.oas.annotations.media.Schema.RequiredMode.*;
+
+import org.depromeet.sambad.moring.meeting.meeting.domain.Meeting;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+
+public record MeetingCodeResponse(
+	@Schema(description = "초대 코드", example = "ABCDEF", requiredMode = REQUIRED)
+	String code
+) {
+	public static MeetingCodeResponse from(Meeting meeting) {
+		return new MeetingCodeResponse(meeting.getCode());
+	}
+}