add optional rootHost

api/v1alpha1/dnsrecord_types.go

@@ -26,6 +26,11 @@ import (
 
 // DNSRecordSpec defines the desired state of DNSRecord
 type DNSRecordSpec struct {
+
+	// rootHost is the single root for all endpoints in a DNSRecord.
+	//If rootHost is set, it is expected all defined endpoints are children 	of or equal to this rootHost
+	// +optional
+	RootHost *string `json:"rootHost,omitempty"`
 	// +kubebuilder:validation:Required
 	// +required
 	ManagedZoneRef *ManagedZoneReference `json:"managedZone,omitempty"`
@@ -104,6 +109,12 @@ const (
 // GetRootDomain returns the shortest domain that is shared across all spec.Endpoints dns names.
 // Validates that all endpoints share an equal root domain and returns an error if they don't.
 func (s *DNSRecord) GetRootDomain() (string, error) {
+	if err := s.Validate(); err != nil {
+		return "", err
+	}
+	if s.Spec.RootHost != nil {
+		return *s.Spec.RootHost, nil
+	}
 	domain := ""
 	dnsNames := []string{}
 	for idx := range s.Spec.Endpoints {
@@ -128,6 +139,20 @@ func (s *DNSRecord) GetRootDomain() (string, error) {
 	return domain, nil
 }
 
+func (s *DNSRecord) Validate() error {
+	if s.Spec.RootHost != nil {
+		if len(strings.Split(*s.Spec.RootHost, ".")) <= 1 {
+			return fmt.Errorf("invalid domain format no tld discovered")
+		}
+		for _, ep := range s.Spec.Endpoints {
+			if !strings.HasSuffix(ep.DNSName, *s.Spec.RootHost) {
+				return fmt.Errorf("invalid endpoint discoverd %s all endpoints should be equal to or end with the rootHost %s", ep.DNSName, *s.Spec.RootHost)
+			}
+		}
+	}
+	return nil
+}
+
 func init() {
 	SchemeBuilder.Register(&DNSRecord{}, &DNSRecordList{})
 }

api/v1alpha1/dnsrecord_types_test.go

@@ -8,14 +8,20 @@ import (
 )
 
 func TestDNSRecord_GetRootDomain(t *testing.T) {
+	var (
+		rootTestExample = "test.example.com"
+		example         = "example.com"
+	)
 	tests := []struct {
 		name     string
+		rootHost *string
 		dnsNames []string
 		want     string
 		wantErr  bool
 	}{
 		{
-			name: "single endpoint",
+			name:     "single endpoint",
+			rootHost: &rootTestExample,
 			dnsNames: []string{
 				"test.example.com",
 			},
@@ -40,12 +46,34 @@ func TestDNSRecord_GetRootDomain(t *testing.T) {
 			wantErr:  true,
 		},
 		{
-			name: "multiple endpoints mismatching",
+			rootHost: &example,
+			name:     "multiple endpoints",
 			dnsNames: []string{
 				"foo.bar.test.example.com",
 				"bar.test.example.com",
 				"baz.example.com",
 			},
+			want:    "example.com",
+			wantErr: false,
+		},
+		{
+			rootHost: &example,
+			name:     "multiple endpoints mismatching",
+			dnsNames: []string{
+				"foo.bar.test.other.com",
+				"bar.test.example.com",
+				"baz.example.com",
+			},
+			want:    "",
+			wantErr: true,
+		},
+		{
+			name: "multiple endpoints no rootHost",
+			dnsNames: []string{
+				"foo.bar.test.other.com",
+				"bar.test.example.com",
+				"baz.example.com",
+			},
 			want:    "",
 			wantErr: true,
 		},
@@ -65,6 +93,9 @@ func TestDNSRecord_GetRootDomain(t *testing.T) {
 					Endpoints: []*endpoint.Endpoint{},
 				},
 			}
+			if tt.rootHost != nil {
+				s.Spec.RootHost = tt.rootHost
+			}
 			for idx := range tt.dnsNames {
 				s.Spec.Endpoints = append(s.Spec.Endpoints, &endpoint.Endpoint{DNSName: tt.dnsNames[idx]})
 			}
@@ -79,3 +110,45 @@ func TestDNSRecord_GetRootDomain(t *testing.T) {
 		})
 	}
 }
+
+func TestValidate(t *testing.T) {
+	tests := []struct {
+		name     string
+		rootHost string
+		dnsNames []string
+		wantErr  bool
+	}{
+		{
+			name:     "invalid domain",
+			rootHost: "example",
+			wantErr:  true,
+		},
+		{
+			name:     "valid domain",
+			rootHost: "example.com",
+			dnsNames: []string{
+				"example.com",
+				"a.b.example.com",
+				"b.a.example.com",
+				"a.example.com",
+				"b.example.com",
+			},
+			wantErr: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			record := &DNSRecord{
+				Spec: DNSRecordSpec{
+					RootHost: &tt.rootHost,
+				},
+			}
+			err := record.Validate()
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Validate() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+		})
+	}
+}

config/crd/bases/kuadrant.io_dnsrecords.yaml

@@ -94,6 +94,11 @@ spec:
                 required:
                 - name
                 type: object
+              rootHost:
+                description: "rootHost is the single root for all endpoints in a DNSRecord.
+                  If rootHost is set, it is expected all defined endpoints are children
+                  \tof or equal to this rootHost"
+                type: string
             type: object
           status:
             description: DNSRecordStatus defines the observed state of DNSRecord