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zonespec.go
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/
zonespec.go
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package dns
import (
"fmt"
"github.com/golang/glog"
"k8s.io/kubernetes/federation/pkg/dnsprovider"
"strings"
)
type ZoneSpec struct {
Name string
ID string
}
func ParseZoneSpec(s string) (*ZoneSpec, error) {
s = strings.TrimSpace(s)
tokens := strings.SplitN(s, "/", 2)
if len(tokens) == 2 && tokens[0] == "*" {
// */1234: Match by ID
return &ZoneSpec{ID: tokens[1]}, nil
}
name := EnsureDotSuffix(tokens[0])
if len(tokens) == 1 {
// example.com: Match by name
return &ZoneSpec{Name: name}, nil
}
// example.com/1234: Match by name & id
return &ZoneSpec{Name: name, ID: tokens[1]}, nil
}
type ZoneRules struct {
// We don't use a map so we can support e.g. *.example.com later
Zones []*ZoneSpec
Wildcard bool
}
func ParseZoneRules(zones []string) (*ZoneRules, error) {
r := &ZoneRules{}
for _, s := range zones {
s = strings.TrimSpace(s)
if s == "*" || s == "*/*" {
r.Wildcard = true
continue
}
zoneSpec, err := ParseZoneSpec(s)
if err != nil {
return nil, fmt.Errorf("error parsing %q: %v", s, err)
}
r.Zones = append(r.Zones, zoneSpec)
}
if len(zones) == 0 {
glog.Infof("No rules specified, will permit management of all zones")
r.Wildcard = true
}
return r, nil
}
// MatchesExplicitly returns true if this matches an explicit rule (not a wildcard)
func (r *ZoneRules) MatchesExplicitly(zone dnsprovider.Zone) bool {
name := EnsureDotSuffix(zone.Name())
id := zone.ID()
for _, zoneSpec := range r.Zones {
if zoneSpec.Name != "" && zoneSpec.Name != name {
continue
}
if zoneSpec.ID != "" && zoneSpec.ID != id {
return false
}
return true
}
return false
}