3ba86f2421
* Updating comment to remove references to Caddy * Updating README to mark TODO items complete * Changing all debug print statements over to use logging package
48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
package kubernetes
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import (
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"log"
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"github.com/miekg/dns"
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)
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// NormalizeZoneList filters the zones argument to remove
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// array items that conflict with other items in zones.
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// For example, providing the following zones array:
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// [ "a.b.c", "b.c", "a", "e.d.f", "a.b" ]
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// Returns:
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// [ "a.b.c", "a", "e.d.f", "a.b" ]
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// Zones filted out:
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// - "b.c" because "a.b.c" and "b.c" share the common top
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// level "b.c". First listed zone wins if there is a conflict.
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//
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// Note: This may prove to be too restrictive in practice.
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// Need to find counter-example use-cases.
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func NormalizeZoneList(zones []string) []string {
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filteredZones := []string{}
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for _, z := range zones {
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zoneConflict, _ := subzoneConflict(filteredZones, z)
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if zoneConflict {
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log.Printf("[WARN] new zone '%v' from Corefile conflicts with existing zones: %v\n Ignoring zone '%v'\n", z, filteredZones, z)
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} else {
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filteredZones = append(filteredZones, z)
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}
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}
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return filteredZones
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}
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// subzoneConflict returns true if name is a child or parent zone of
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// any element in zones. If conflicts exist, return the conflicting zones.
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func subzoneConflict(zones []string, name string) (bool, []string) {
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conflicts := []string{}
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for _, z := range zones {
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if dns.IsSubDomain(z, name) || dns.IsSubDomain(name, z) {
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conflicts = append(conflicts, z)
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}
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}
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return (len(conflicts) != 0), conflicts
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}
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