Add missing file

internal/contour/dag/dag.go

@@ -0,0 +1,51 @@
+// Copyright Project Contour Authors
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Package dag provides a data model, in the form of a directed acyclic graph,
+// of the relationship between Kubernetes Ingress, Service, and Secret objects.
+package dag
+
+import (
+	core_v1 "k8s.io/api/core/v1"
+)
+
+// Secret represents a K8s Secret for TLS usage as a DAG Vertex. A Secret is
+// a leaf in the DAG.
+type Secret struct {
+	Object         *core_v1.Secret
+	ValidTLSSecret *SecretValidationStatus
+	ValidCASecret  *SecretValidationStatus
+	ValidCRLSecret *SecretValidationStatus
+}
+
+func (s *Secret) Name() string      { return s.Object.Name }
+func (s *Secret) Namespace() string { return s.Object.Namespace }
+
+// Data returns the contents of the backing secret's map.
+func (s *Secret) Data() map[string][]byte {
+	return s.Object.Data
+}
+
+// Cert returns the secret's tls certificate
+func (s *Secret) Cert() []byte {
+	return s.Object.Data[core_v1.TLSCertKey]
+}
+
+// PrivateKey returns the secret's tls private key
+func (s *Secret) PrivateKey() []byte {
+	return s.Object.Data[core_v1.TLSPrivateKeyKey]
+}
+
+type SecretValidationStatus struct {
+	Error error
+}