From f685b4a2489d7ed63907365f5a5a20891504838a Mon Sep 17 00:00:00 2001
From: Peter Rounce <peter@rounce.me.uk>
Date: Sun, 20 Nov 2022 13:02:06 +0000
Subject: [PATCH] check for unique card_name - fixes #17

---
 createboltcard/database.go | 21 +++++++++++++++++++++
 createboltcard/main.go     | 15 ++++++++++++++-
 2 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/createboltcard/database.go b/createboltcard/database.go
index ab4d472..29d4d7b 100644
--- a/createboltcard/database.go
+++ b/createboltcard/database.go
@@ -46,6 +46,27 @@ func db_delete_expired() error {
 	return nil
 }
 
+func db_get_card_name_count(card_name string) (card_count int, err error) {
+
+	card_count = 0
+
+	db, err := db_open()
+	if err != nil {
+		return 0, err
+	}
+	defer db.Close()
+
+	sqlStatement := `SELECT COUNT(card_id) FROM cards WHERE card_name = $1;`
+
+	row := db.QueryRow(sqlStatement, card_name)
+	err = row.Scan(&card_count)
+	if err != nil {
+		return 0, err
+	}
+
+	return card_count, nil
+}
+
 func db_insert_card(one_time_code string, k0_auth_key string, k2_cmac_key string, k3 string, k4 string,
 	tx_max_sats int, day_max_sats int, lnurlw_enable bool, card_name string) error {
 
diff --git a/createboltcard/main.go b/createboltcard/main.go
index f502afe..cf0bd15 100644
--- a/createboltcard/main.go
+++ b/createboltcard/main.go
@@ -36,6 +36,19 @@ func main() {
 		return
 	}
 
+	// check if card_name already exists
+
+	card_count, err := db_get_card_name_count(*card_name_ptr)
+	if err != nil {
+		log.Warn(err.Error())
+		return
+	}
+
+	if card_count > 0 {
+		fmt.Println("the card name already exists in the database")
+		return
+	}
+
 	// create the keys
 
 	one_time_code := random_hex()
@@ -46,7 +59,7 @@ func main() {
 
 	// create the new card record
 
-	err := db_insert_card(one_time_code, k0_auth_key, k2_cmac_key, k3, k4,
+	err = db_insert_card(one_time_code, k0_auth_key, k2_cmac_key, k3, k4,
 		*tx_max_ptr, *day_max_ptr, *enable_flag_ptr, *card_name_ptr)
 	if err != nil {
 		log.Warn(err.Error())