Add helper for lowercase list of strings

consul/util.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"runtime"
 	"strconv"
+	"strings"
 
 	"github.com/hashicorp/serf/serf"
 )
@@ -68,6 +69,14 @@ func strContains(l []string, s string) bool {
 	return false
 }
 
+func ToLowerList(l []string) []string {
+	var out []string
+	for _, value := range l {
+		out = append(out, strings.ToLower(value))
+	}
+	return out
+}
+
 // ensurePath is used to make sure a path exists
 func ensurePath(path string, dir bool) error {
 	if !dir {

consul/util_test.go

@@ -18,6 +18,15 @@ func TestStrContains(t *testing.T) {
 	}
 }
 
+func TestToLowerList(t *testing.T) {
+	l := []string{"ABC", "Abc", "abc"}
+	for _, value := range ToLowerList(l) {
+		if value != "abc" {
+			t.Fatalf("failed lowercasing")
+		}
+	}
+}
+
 func TestIsPrivateIP(t *testing.T) {
 	if !isPrivateIP("192.168.1.1") {
 		t.Fatalf("bad")