add automatic localhost and local ip to allow origin

utils/utils.go

@@ -1,5 +1,10 @@
 package utils
 
+import (
+	"fmt"
+	"net"
+)
+
 func ListofA2ZZ() (list []string) {
 	for i := 'A'; i <= 'Z'; i++ {
 		list = append(list, string(i))
@@ -9,12 +14,21 @@ func ListofA2ZZ() (list []string) {
 			list = append(list, string(i)+string(j))
 		}
 	}
-	// for i := 'A'; i <= 'Z'; i++ {
-	// 	for j := 'A'; j <= 'Z'; j++ {
-	// 		for k := 'A'; k <= 'Z'; k++ {
-	// 			list = append(list, string(i)+string(j)+string(k))
-	// 		}
-	// 	}
-	// }
 	return
 }
+
+func GetLocalIP() (string, error) {
+	addrs, err := net.InterfaceAddrs()
+	if err != nil {
+		return "", err
+	}
+
+	for _, addr := range addrs {
+		if ipNet, ok := addr.(*net.IPNet); ok && !ipNet.IP.IsLoopback() {
+			if ipNet.IP.To4() != nil {
+				return ipNet.IP.String(), nil
+			}
+		}
+	}
+	return "", fmt.Errorf("no local IP address found")
+}