private Mono<Boolean> isAllowedToViewMeetingInfo(
            @NotNull Long requesterId,
            @NotNull Meeting meeting) {
        if (requesterId.equals(meeting.getCreatorId()) || requesterId.equals(meeting.getUserId())) {
            return PublisherPool.TRUE;
        }
        Long groupId = meeting.getGroupId();
        if (groupId == null) {
            return PublisherPool.TRUE;
        }
        return groupMemberService.isGroupMember(groupId, requesterId, false);
    }
TODO: Allow developers to configuring whether a meeting invitation can only be updated once.
turms-service/src/main/java/im/turms/service/domain/conference/service/ConferenceService.java