1 files changed, 0 insertions, 48 deletions
diff --git a/middleware/kubernetes/subzone.go b/middleware/kubernetes/subzone.go
deleted file mode 100644
index 6c4a79126..000000000
--- a/middleware/kubernetes/subzone.go
+++ /dev/null
@@ -1,48 +0,0 @@
-package kubernetes
-
-import (
-	"log"
-
-	"github.com/miekg/dns"
-)
-
-// NormalizeZoneList filters the zones argument to remove
-// array items that conflict with other items in zones.
-// For example, providing the following zones array:
-//    [ "a.b.c", "b.c", "a", "e.d.f", "a.b" ]
-// Returns:
-//    [ "a.b.c", "a", "e.d.f", "a.b" ]
-// Zones filted out:
-//    - "b.c" because "a.b.c" and "b.c" share the common top
-//      level "b.c". First listed zone wins if there is a conflict.
-//
-// Note: This may prove to be too restrictive in practice.
-//       Need to find counter-example use-cases.
-func NormalizeZoneList(zones []string) []string {
-	filteredZones := []string{}
-
-	for _, z := range zones {
-		zoneConflict, _ := subzoneConflict(filteredZones, z)
-		if zoneConflict {
-			log.Printf("[WARN] new zone '%v' from Corefile conflicts with existing zones: %v\n        Ignoring zone '%v'\n", z, filteredZones, z)
-		} else {
-			filteredZones = append(filteredZones, z)
-		}
-	}
-
-	return filteredZones
-}
-
-// subzoneConflict returns true if name is a child or parent zone of
-// any element in zones. If conflicts exist, return the conflicting zones.
-func subzoneConflict(zones []string, name string) (bool, []string) {
-	conflicts := []string{}
-
-	for _, z := range zones {
-		if dns.IsSubDomain(z, name) || dns.IsSubDomain(name, z) {
-			conflicts = append(conflicts, z)
-		}
-	}
-
-	return (len(conflicts) != 0), conflicts
-}