feat: 完成规格映射与采购任务创建 (#69)

admin/repository/client.go

@@ -184,6 +184,26 @@ func ListClientsForUser(db *sql.DB, keyword, visibleUserID string) ([]ClientWith
 	return listClientsForUserPage(db, keyword, visibleUserID, -1, 0)
 }
 
+// ClientVisibleToUser 校验客户端是否存在且位于当前账号可见范围。
+// visibleUserID 为空表示管理员，可选择任意已登记客户端。
+func ClientVisibleToUser(q Execer, clientID, visibleUserID string) (bool, error) {
+	query := `SELECT COUNT(*) FROM clients c`
+	args := []any{}
+	if visibleUserID != "" {
+		query += ` JOIN client_user_assignments a
+		             ON a.client_id = c.client_id AND a.ended_at IS NULL
+		            AND a.user_id = ?`
+		args = append(args, visibleUserID)
+	}
+	query += ` WHERE c.client_id = ?`
+	args = append(args, clientID)
+	var count int
+	if err := q.QueryRow(query, args...).Scan(&count); err != nil {
+		return false, fmt.Errorf("校验客户端可见范围失败: %w", err)
+	}
+	return count == 1, nil
+}
+
 // ListClientsForUserPage 返回一页客户端和同一可见范围内的总数。
 func ListClientsForUserPage(db *sql.DB, keyword, visibleUserID string, limit, offset int) ([]ClientWithAssignee, int, error) {
 	where, args := clientListFilter(keyword, visibleUserID)