Added arn to the main repository

arn/IDList.go

@@ -0,0 +1,20 @@
+package arn
+
+// IDList stores lists of IDs that are retrievable by name.
+type IDList []string
+
+// GetIDList ...
+func GetIDList(id string) (IDList, error) {
+	obj, err := DB.Get("IDList", id)
+
+	if err != nil {
+		return nil, err
+	}
+
+	return *obj.(*IDList), nil
+}
+
+// Append appends the given ID to the end of the list and returns the new IDList.
+func (idList IDList) Append(id string) IDList {
+	return append(idList, id)
+}