1 files changed, 71 insertions, 0 deletions
diff --git a/pkg/v1/manifest.go b/pkg/v1/manifest.go
new file mode 100644
index 0000000..22d483f
--- /dev/null
+++ b/pkg/v1/manifest.go
@@ -0,0 +1,71 @@
+// Copyright 2018 Google LLC All Rights Reserved.
+//
+// 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 v1
+
+import (
+	"encoding/json"
+	"io"
+
+	"github.com/google/go-containerregistry/pkg/v1/types"
+)
+
+// Manifest represents the OCI image manifest in a structured way.
+type Manifest struct {
+	SchemaVersion int64             `json:"schemaVersion"`
+	MediaType     types.MediaType   `json:"mediaType,omitempty"`
+	Config        Descriptor        `json:"config"`
+	Layers        []Descriptor      `json:"layers"`
+	Annotations   map[string]string `json:"annotations,omitempty"`
+	Subject       *Descriptor       `json:"subject,omitempty"`
+}
+
+// IndexManifest represents an OCI image index in a structured way.
+type IndexManifest struct {
+	SchemaVersion int64             `json:"schemaVersion"`
+	MediaType     types.MediaType   `json:"mediaType,omitempty"`
+	Manifests     []Descriptor      `json:"manifests"`
+	Annotations   map[string]string `json:"annotations,omitempty"`
+	Subject       *Descriptor       `json:"subject,omitempty"`
+}
+
+// Descriptor holds a reference from the manifest to one of its constituent elements.
+type Descriptor struct {
+	MediaType    types.MediaType   `json:"mediaType"`
+	Size         int64             `json:"size"`
+	Digest       Hash              `json:"digest"`
+	Data         []byte            `json:"data,omitempty"`
+	URLs         []string          `json:"urls,omitempty"`
+	Annotations  map[string]string `json:"annotations,omitempty"`
+	Platform     *Platform         `json:"platform,omitempty"`
+	ArtifactType string            `json:"artifactType,omitempty"`
+}
+
+// ParseManifest parses the io.Reader's contents into a Manifest.
+func ParseManifest(r io.Reader) (*Manifest, error) {
+	m := Manifest{}
+	if err := json.NewDecoder(r).Decode(&m); err != nil {
+		return nil, err
+	}
+	return &m, nil
+}
+
+// ParseIndexManifest parses the io.Reader's contents into an IndexManifest.
+func ParseIndexManifest(r io.Reader) (*IndexManifest, error) {
+	im := IndexManifest{}
+	if err := json.NewDecoder(r).Decode(&im); err != nil {
+		return nil, err
+	}
+	return &im, nil
+}