return index on get magifest

app/operator/ociaux.go

@@ -10,6 +10,9 @@
 package operator
 
 import (
+	"encoding/json"
+
+	"mstore/pkg/auxoci"
 	"mstore/pkg/auxtool"
 	"mstore/pkg/auxuuid"
 	"mstore/pkg/descr"
@@ -18,6 +21,42 @@ import (
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
+func indexFromManigestDescrs(manifestDescrs []descr.Manifest) (ocispec.Index, string, error) {
+	var err error
+	var payload string
+	index := ocispec.Index{
+		MediaType: ocispec.MediaTypeImageIndex,
+		Manifests: make([]ocispec.Descriptor, 0),
+	}
+	index.Versioned.SchemaVersion = 2
+	for _, manifestDescr := range manifestDescrs {
+		var ociManifest ocispec.Manifest
+
+		ociManifest.Subject = &ocispec.Descriptor{}
+		ociManifest.Subject.Platform = &ocispec.Platform{}
+		ociManifest.Config = ocispec.Descriptor{}
+		ociManifest.Config.Platform = &ocispec.Platform{}
+
+		err = json.Unmarshal([]byte(manifestDescr.Payload), &ociManifest)
+		if err != nil {
+			return index, payload, err
+		}
+		descriptor := ocispec.Descriptor{
+			MediaType: ocispec.MediaTypeImageManifest,
+			Digest:    auxoci.SHA256DigestFromString(manifestDescr.Payload),
+			Size:      int64(len(manifestDescr.Payload)),
+			Platform:  ociManifest.Subject.Platform,
+		}
+		index.Manifests = append(index.Manifests, descriptor)
+	}
+	indexBytes, err := json.Marshal(index)
+	if err != nil {
+		return index, payload, err
+	}
+	payload = string(indexBytes)
+	return index, payload, err
+}
+
 func descrsFromManifest(name, reference string, manifest *ocispec.Manifest, rawManifest []byte) (descr.Manifest, []descr.Blob, error) {
 	var err error
 	manifestDescr := descr.Manifest{}