chore: vendor

vendor/github.com/docker/distribution/manifest/ocischema/manifest.go

@@ -0,0 +1,146 @@
+package ocischema
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/docker/distribution"
+	"github.com/docker/distribution/manifest"
+	"github.com/opencontainers/go-digest"
+	v1 "github.com/opencontainers/image-spec/specs-go/v1"
+)
+
+var (
+	// SchemaVersion provides a pre-initialized version structure for this
+	// packages version of the manifest.
+	SchemaVersion = manifest.Versioned{
+		SchemaVersion: 2, // historical value here.. does not pertain to OCI or docker version
+		MediaType:     v1.MediaTypeImageManifest,
+	}
+)
+
+func init() {
+	ocischemaFunc := func(b []byte) (distribution.Manifest, distribution.Descriptor, error) {
+		if err := validateManifest(b); err != nil {
+			return nil, distribution.Descriptor{}, err
+		}
+		m := new(DeserializedManifest)
+		err := m.UnmarshalJSON(b)
+		if err != nil {
+			return nil, distribution.Descriptor{}, err
+		}
+
+		dgst := digest.FromBytes(b)
+		return m, distribution.Descriptor{Digest: dgst, Size: int64(len(b)), MediaType: v1.MediaTypeImageManifest}, err
+	}
+	err := distribution.RegisterManifestSchema(v1.MediaTypeImageManifest, ocischemaFunc)
+	if err != nil {
+		panic(fmt.Sprintf("Unable to register manifest: %s", err))
+	}
+}
+
+// Manifest defines a ocischema manifest.
+type Manifest struct {
+	manifest.Versioned
+
+	// Config references the image configuration as a blob.
+	Config distribution.Descriptor `json:"config"`
+
+	// Layers lists descriptors for the layers referenced by the
+	// configuration.
+	Layers []distribution.Descriptor `json:"layers"`
+
+	// Annotations contains arbitrary metadata for the image manifest.
+	Annotations map[string]string `json:"annotations,omitempty"`
+}
+
+// References returns the descriptors of this manifests references.
+func (m Manifest) References() []distribution.Descriptor {
+	references := make([]distribution.Descriptor, 0, 1+len(m.Layers))
+	references = append(references, m.Config)
+	references = append(references, m.Layers...)
+	return references
+}
+
+// Target returns the target of this manifest.
+func (m Manifest) Target() distribution.Descriptor {
+	return m.Config
+}
+
+// DeserializedManifest wraps Manifest with a copy of the original JSON.
+// It satisfies the distribution.Manifest interface.
+type DeserializedManifest struct {
+	Manifest
+
+	// canonical is the canonical byte representation of the Manifest.
+	canonical []byte
+}
+
+// FromStruct takes a Manifest structure, marshals it to JSON, and returns a
+// DeserializedManifest which contains the manifest and its JSON representation.
+func FromStruct(m Manifest) (*DeserializedManifest, error) {
+	var deserialized DeserializedManifest
+	deserialized.Manifest = m
+
+	var err error
+	deserialized.canonical, err = json.MarshalIndent(&m, "", "   ")
+	return &deserialized, err
+}
+
+// UnmarshalJSON populates a new Manifest struct from JSON data.
+func (m *DeserializedManifest) UnmarshalJSON(b []byte) error {
+	m.canonical = make([]byte, len(b))
+	// store manifest in canonical
+	copy(m.canonical, b)
+
+	// Unmarshal canonical JSON into Manifest object
+	var manifest Manifest
+	if err := json.Unmarshal(m.canonical, &manifest); err != nil {
+		return err
+	}
+
+	if manifest.MediaType != "" && manifest.MediaType != v1.MediaTypeImageManifest {
+		return fmt.Errorf("if present, mediaType in manifest should be '%s' not '%s'",
+			v1.MediaTypeImageManifest, manifest.MediaType)
+	}
+
+	m.Manifest = manifest
+
+	return nil
+}
+
+// MarshalJSON returns the contents of canonical. If canonical is empty,
+// marshals the inner contents.
+func (m *DeserializedManifest) MarshalJSON() ([]byte, error) {
+	if len(m.canonical) > 0 {
+		return m.canonical, nil
+	}
+
+	return nil, errors.New("JSON representation not initialized in DeserializedManifest")
+}
+
+// Payload returns the raw content of the manifest. The contents can be used to
+// calculate the content identifier.
+func (m DeserializedManifest) Payload() (string, []byte, error) {
+	return v1.MediaTypeImageManifest, m.canonical, nil
+}
+
+// unknownDocument represents a manifest, manifest list, or index that has not
+// yet been validated
+type unknownDocument struct {
+	Manifests interface{} `json:"manifests,omitempty"`
+}
+
+// validateManifest returns an error if the byte slice is invalid JSON or if it
+// contains fields that belong to a index
+func validateManifest(b []byte) error {
+	var doc unknownDocument
+	if err := json.Unmarshal(b, &doc); err != nil {
+		return err
+	}
+	if doc.Manifests != nil {
+		return errors.New("ocimanifest: expected manifest but found index")
+	}
+	return nil
+}