From 7754b46dc4932a6e019b173713bfa5c80ad18f32 Mon Sep 17 00:00:00 2001
From: H1JK <hell0jack@protonmail.com>
Date: Fri, 8 Mar 2024 22:45:10 +0800
Subject: [PATCH] fix: MaxMind MMDB code character case

---
 component/mmdb/reader.go | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/component/mmdb/reader.go b/component/mmdb/reader.go
index 6247cd8a8..787bdfe8f 100644
--- a/component/mmdb/reader.go
+++ b/component/mmdb/reader.go
@@ -3,6 +3,7 @@ package mmdb
 import (
 	"fmt"
 	"net"
+	"strings"
 
 	"github.com/oschwald/maxminddb-golang"
 )
@@ -26,7 +27,7 @@ func (r Reader) LookupCode(ipAddress net.IP) []string {
 		if country.Country.IsoCode == "" {
 			return []string{}
 		}
-		return []string{country.Country.IsoCode}
+		return []string{strings.ToLower(country.Country.IsoCode)}
 
 	case typeSing:
 		var code string