add kube CSR access

cmd/dkl-local-server/parsers_test.go

@@ -0,0 +1,23 @@
+package main
+
+import (
+	"fmt"
+	"time"
+)
+
+func Example_parseCertDuration() {
+	now := time.Date(2020, time.April, 28, 12, 30, 0, 0, time.UTC)
+
+	fmt.Println(parseCertDuration("", now))
+	fmt.Println(parseCertDuration("hi!", now))
+	fmt.Println(parseCertDuration("-2d3h", now))
+	fmt.Println(parseCertDuration("2d3h", now))
+	fmt.Println(parseCertDuration("+1y-1s", now))
+
+	// output:
+	// 0001-01-01 00:00:00 +0000 UTC <nil>
+	// 0001-01-01 00:00:00 +0000 UTC invalid duration: "hi!"
+	// 2020-04-26 09:30:00 +0000 UTC <nil>
+	// 2020-04-30 15:30:00 +0000 UTC <nil>
+	// 2021-04-28 12:29:59 +0000 UTC <nil>
+}