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Date: Thu, 23 Nov 2023 19:34:14 +0900
Subject: [PATCH] =?UTF-8?q?fix(backend):=20=E6=8B=9B=E5=BE=85=E3=82=B3?=
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* (fix) 招待コードを一度のみ利用できるように

* Update Changelog
---
 CHANGELOG.md                                        | 1 +
 packages/backend/src/server/api/SignupApiService.ts | 2 +-
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index bc39e423c0..23bd05ea8b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -27,6 +27,7 @@
 - Fix: 時間経過により無効化されたアンテナを再有効化したとき、サーバ再起動までその状況が反映されないのを修正 #12303
 - Fix: ロールタイムラインが保存されない問題を修正
 - Fix: api.jsonの生成ロジックを改善 #12402
+- Fix: 招待コードが使い回せる問題を修正
 
 ## 2023.11.1
 
diff --git a/packages/backend/src/server/api/SignupApiService.ts b/packages/backend/src/server/api/SignupApiService.ts
index d6f4df7f13..753984ef52 100644
--- a/packages/backend/src/server/api/SignupApiService.ts
+++ b/packages/backend/src/server/api/SignupApiService.ts
@@ -126,7 +126,7 @@ export class SignupApiService {
 				code: invitationCode,
 			});
 
-			if (ticket == null) {
+			if (ticket == null || ticket.usedById != null) {
 				reply.code(400);
 				return;
 			}