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CreateOrder 下单时的 HasPaidPurchase 只是裸 SELECT 无锁,并发/多挂起单可绕过 promo SKU「每账号限购一次」。两层修: ① webhook.go settle 在锁行、开通前对 item.Promo 的 SKU 复查一次(排除本单), 命中说明另一笔同 user+SKU 订单已抢先 settle,跳过发放(不二次 +N 天)、 仍 ack(否则 pay 无限重投)。新增 store.HasPaidPurchaseExcludingTx / MarkDuplicatePromoTx——重复单标记 canceled 而非 paid,避免自撞下面的 唯一索引、也避免整笔 500 触发死循环重投。 ② migration 000027(sqlite):部分唯一索引 ux_pay_promo_paid ON pay_purchases(user_id, sku) WHERE status='paid' AND sku='pro_month_promo', 兜底防止任何路径把同一用户的 promo 单二次写成 paid。mysql 8 不支持部分 索引,000027 mysql 侧是 no-op 占位(仅对齐编号),该场景 mysql 只靠①的 应用层复查兜底——两库防线强度不同,已在迁移文件与代码注释中记录。 副作用:新增迁移把 sqlite 迁移顶点从 26 推到 27,同步更新 internal/store/sqlite_migrate_test.go 的版本断言,以及 internal/store/codes_lib_migrate_test.go 手动 Steps(-1) 序列(补一步跳过 000027,才能精确落在 000022 边界,这条测试是硬编码步数的)。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
10 lines
696 B
SQL
10 lines
696 B
SQL
-- C2 安全修复(promo 限购 TOCTOU):CreateOrder 下单时的 HasPaidPurchase 只是裸
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-- SELECT(无锁),并发/多挂起单可绕过「每账号限购一次」。这里加部分唯一索引兜底:
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-- 同一 user_id 的 pro_month_promo 至多一条 status='paid'。sqlite 支持部分索引
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-- (WHERE 子句),精确限定 sku='pro_month_promo'(目前唯一的 Promo=true 档位),
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-- 不影响其余 SKU 正常复购。webhook.go settle 侧另有应用层复查作为第一道防线
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-- (mysql 侧 000027 是 no-op,不支持部分索引——见 mysql 版本注释)。
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CREATE UNIQUE INDEX ux_pay_promo_paid
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ON pay_purchases (user_id, sku)
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WHERE status = 'paid' AND sku = 'pro_month_promo';
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