Support mobile in DingTalk userinfo

util/validation.go

@@ -15,6 +15,7 @@
 package util
 
 import (
+	"fmt"
 	"net/mail"
 	"regexp"
 
@@ -48,3 +49,21 @@ func GetE164Number(phone string, countryCode string) (string, bool) {
 	phoneNumber, _ := phonenumbers.Parse(phone, countryCode)
 	return phonenumbers.Format(phoneNumber, phonenumbers.E164), phonenumbers.IsValidNumber(phoneNumber)
 }
+
+func GetCountryCode(prefix string, phone string) (string, error) {
+	if prefix == "" || phone == "" {
+		return "", nil
+	}
+
+	phoneNumber, err := phonenumbers.Parse(fmt.Sprintf("+%s%s", prefix, phone), "")
+	if err != nil {
+		return "", err
+	}
+
+	countryCode := phonenumbers.GetRegionCodeForNumber(phoneNumber)
+	if countryCode == "" {
+		return "", fmt.Errorf("country code not found for phone prefix: %s", prefix)
+	}
+
+	return countryCode, nil
+}