Initial commit

checker/abstract.go

@@ -0,0 +1,46 @@
+package checker
+
+import (
+	"encoding/json"
+
+	"github.com/miekg/dns"
+)
+
+// Service type identifiers as exposed by happyDomain core.
+const (
+	serviceTypeOrigin       = "abstract.Origin"
+	serviceTypeNSOnlyOrigin = "abstract.NSOnlyOrigin"
+)
+
+// originPayload is a minimal local copy of services/abstract.Origin keeping
+// only the field this checker reads. The JSON tag matches the upstream wire
+// format ("ns").
+type originPayload struct {
+	NameServers []*dns.NS `json:"ns"`
+}
+
+// nsOnlyOriginPayload is a minimal local copy of
+// services/abstract.NSOnlyOrigin keeping only the field this checker reads.
+type nsOnlyOriginPayload struct {
+	NameServers []*dns.NS `json:"ns"`
+}
+
+// nsFromService extracts the list of NS records from an Origin or
+// NSOnlyOrigin service payload.
+func nsFromService(svc *serviceMessage) []*dns.NS {
+	switch svc.Type {
+	case serviceTypeOrigin:
+		var o originPayload
+		if err := json.Unmarshal(svc.Service, &o); err != nil {
+			return nil
+		}
+		return o.NameServers
+	case serviceTypeNSOnlyOrigin:
+		var o nsOnlyOriginPayload
+		if err := json.Unmarshal(svc.Service, &o); err != nil {
+			return nil
+		}
+		return o.NameServers
+	}
+	return nil
+}