style: rename controllers to login, cancel internal/pkg

internal/dns/util/domain.go

@@ -0,0 +1,18 @@
+package dnsUtil
+
+import (
+	"errors"
+	"strings"
+)
+
+func DecodeDomain(domain string) (subStr string, rootDomain string, e error) {
+	t := strings.Split(domain, ".")
+	if len(t) == 1 {
+		return "", "", errors.New("域名不合法")
+	} else if len(t) == 2 {
+		return "@", domain, nil
+	}
+
+	l := len(t)
+	return strings.Join(t[:l-2], "."), strings.Join(t[l-2:l], "."), nil
+}