1 files changed, 61 insertions, 0 deletions
diff --git a/type.go b/type.go
new file mode 100644
index 0000000..c64d98d
--- /dev/null
+++ b/type.go
@@ -0,0 +1,61 @@
+package main
+
+import (
+	"fmt"
+	"net"
+	"strings"
+)
+
+type (
+	ipList     []net.IP
+	stringList []string
+)
+
+// return list of IPs as comma separated list
+func (il *ipList) String() string {
+	var res string
+	list := ([]net.IP)(*il)
+	for i := range list {
+		if i > 0 {
+			res += ", "
+		}
+		res += list[i].String()
+	}
+	return res
+}
+
+// receive multiple ip lists as comma separated strings
+func (il *ipList) Set(value string) error {
+	if len(value) == 0 {
+		return nil
+	}
+	var ip net.IP
+
+	parts := strings.Split(value, ",")
+	for i := range parts {
+		ip = net.ParseIP(strings.Trim(parts[i], " \t"))
+		if ip == nil {
+			// TODO encapsulate error in meaningfull error
+			return fmt.Errorf("not a valid IP")
+		}
+		*il = append(*il, ip)
+	}
+	return nil
+}
+
+// return string list as a comma separated list
+func (al *stringList) String() string {
+	return strings.Join(([]string)(*al), ", ")
+}
+
+// receive multiple string lists as comma separated strings
+func (al *stringList) Set(value string) error {
+	if len(value) == 0 {
+		return nil
+	}
+	parts := strings.Split(value, ",")
+	for i := range parts {
+		*al = append(*al, strings.Trim(parts[i], " \t"))
+	}
+	return nil
+}