[feat] 모임 수정, 탈퇴 API 구현

src/main/java/org/kkumulkkum/server/controller/MeetingController.java

@@ -70,4 +70,24 @@ public ResponseEntity<MembersDto> getMembers(
         return ResponseEntity.ok(meetingService.getMembers(meetingId, exclude, userId));
     }
 
+    @IsMemberByMeetingId(meetingIdParamIndex = 0)
+    @PatchMapping("/v1/meetings/{meetingId}")
+    public ResponseEntity<Void> updateMeeting(
+            @PathVariable final Long meetingId,
+            @Valid @RequestBody final MeetingCreateDto meetingCreateDto
+    ) {
+        meetingService.updateMeeting(meetingId, meetingCreateDto);
+        return ResponseEntity.ok().build();
+    }
+
+    @IsMemberByMeetingId(meetingIdParamIndex = 1)
+    @DeleteMapping("/v1/meetings/{meetingId}")
+    public ResponseEntity<Void> leaveMeeting(
+            @UserId final Long userId,
+            @PathVariable final Long meetingId
+    ) {
+        meetingService.leaveMeeting(userId, meetingId);
+        return ResponseEntity.ok().build();
+    }
+
 }

src/main/java/org/kkumulkkum/server/domain/Meeting.java

@@ -31,4 +31,8 @@ public Meeting(String name, String invitationCode) {
         this.name = name;
         this.invitationCode = invitationCode;
     }
+
+    public void updateMeetingName(String name) {
+        this.name = name;
+    }
 }

src/main/java/org/kkumulkkum/server/repository/PromiseRepository.java

@@ -68,4 +68,6 @@ public interface PromiseRepository extends JpaRepository<Promise, Long> {
             WHERE pt.promise.id = :promiseId
             AND m.user.id = :userId""")
     Promise findByUserIdAndPromiseId(Long userId, Long promiseId);
+
+    void deleteByMeetingId(Long meetingId);
 }

src/main/java/org/kkumulkkum/server/service/meeting/MeetingEditor.java

@@ -0,0 +1,18 @@
+package org.kkumulkkum.server.service.meeting;
+
+import lombok.RequiredArgsConstructor;
+import org.kkumulkkum.server.domain.Meeting;
+import org.kkumulkkum.server.dto.meeting.request.MeetingCreateDto;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class MeetingEditor {
+
+    public void updateMeetingName(
+            final Meeting meeting,
+            final MeetingCreateDto meetingCreateDto
+    ) {
+        meeting.updateMeetingName(meetingCreateDto.name());
+    }
+}

src/main/java/org/kkumulkkum/server/service/meeting/MeetingRemover.java

@@ -0,0 +1,16 @@
+package org.kkumulkkum.server.service.meeting;
+
+import lombok.RequiredArgsConstructor;
+import org.kkumulkkum.server.repository.MeetingRepository;
+import org.springframework.stereotype.Component;
+
+@Component
+@RequiredArgsConstructor
+public class MeetingRemover {
+
+    private final MeetingRepository meetingRepository;
+
+    public void deleteById(final Long meetingId) {
+        meetingRepository.deleteById(meetingId);
+    }
+}

src/main/java/org/kkumulkkum/server/service/meeting/MeetingService.java

@@ -14,8 +14,11 @@
 import org.kkumulkkum.server.dto.member.response.MembersDto;
 import org.kkumulkkum.server.exception.MeetingException;
 import org.kkumulkkum.server.exception.code.MeetingErrorCode;
+import org.kkumulkkum.server.service.member.MemberRemover;
 import org.kkumulkkum.server.service.member.MemberRetreiver;
 import org.kkumulkkum.server.service.member.MemberSaver;
+import org.kkumulkkum.server.service.participant.ParticipantRemover;
+import org.kkumulkkum.server.service.promise.PromiseRemover;
 import org.kkumulkkum.server.service.user.UserRetriever;
 import org.springframework.stereotype.Service;
 import org.springframework.transaction.annotation.Transactional;
@@ -33,6 +36,11 @@ public class MeetingService {
     private final UserRetriever userRetriever;
     private final MemberSaver memberSaver;
     private final MemberRetreiver memberRetreiver;
+    private final MeetingEditor meetingEditor;
+    private final ParticipantRemover participantRemover;
+    private final MemberRemover memberRemover;
+    private final PromiseRemover promiseRemover;
+    private final MeetingRemover meetingRemover;
 
     @Transactional
     public CreatedMeetingDto createMeeting(
@@ -95,6 +103,32 @@ public MembersDto getMembers(final Long meetingId, final String exclude, final L
         return MembersDto.from(members);
     }
 
+    @Transactional
+    public void updateMeeting(
+            final Long meetingId,
+            final MeetingCreateDto meetingCreateDto
+    ) {
+        Meeting meeting = meetingRetriever.findById(meetingId);
+        meetingEditor.updateMeetingName(meeting, meetingCreateDto);
+    }
+
+    @Transactional
+    public void leaveMeeting(
+            final Long userId,
+            final Long meetingId) {
+        //모임 나가면 참여한 약속도 다 나가기
+        Member member = memberRetreiver.findByMeetingIdAndUserId(meetingId, userId);
+        participantRemover.deleteByMemberId(member.getId());
+        memberRemover.deleteById(member.getId());
+
+        // 모임 내 참여 인원이 전부 탈퇴 or 나가기로 없을 경우(모임 사라지면) 약속도 다 삭제하기
+        List<MemberDto> remainingMembers = memberRetreiver.findAllByMeetingId(meetingId);
+        if(remainingMembers.isEmpty()) {
+            promiseRemover.deleteByMeetingId(meetingId);
+            meetingRemover.deleteById(meetingId);
+        }
+    }
+
     private String generateInvitationCode() {
         String invitationCode;
 

src/main/java/org/kkumulkkum/server/service/member/MemberRemover.java

@@ -16,4 +16,8 @@ public class MemberRemover {
     public void deleteAll(final List<Member> members) {
         memberRepository.deleteAll(members);
     }
+
+    public void deleteById(final Long memberId) {
+        memberRepository.deleteById(memberId);
+    }
 }

src/main/java/org/kkumulkkum/server/service/promise/PromiseRemover.java

@@ -13,4 +13,8 @@ public class PromiseRemover {
     public void deleteById(final Long promiseId) {
         promiseRepository.deleteById(promiseId);
     }
+
+    public void deleteByMeetingId(final Long meetingId) {
+        promiseRepository.deleteByMeetingId(meetingId);
+    }
 }