From b0dbb8fd608cd18a70916d24a7236709904a9f58 Mon Sep 17 00:00:00 2001
From: Darren Shepherd <darren@rancher.com>
Date: Mon, 9 Nov 2020 21:52:17 -0700
Subject: [PATCH] Add filter helper method

(cherry picked from commit 9b1b7d3132e8b0dad6493f257386aa3bfb7b69f8)
---
 filter.go | 12 ++++++++++++
 1 file changed, 12 insertions(+)
 create mode 100644 filter.go

diff --git a/filter.go b/filter.go
new file mode 100644
index 0000000..d178966
--- /dev/null
+++ b/filter.go
@@ -0,0 +1,12 @@
+package dynamiclistener
+
+func OnlyAllow(str string) func(...string) []string {
+	return func(s2 ...string) []string {
+		for _, s := range s2 {
+			if s == str {
+				return []string{s}
+			}
+		}
+		return nil
+	}
+}