app/imageoper: index only for OCI manifests

app/imageoper/const.go

@@ -0,0 +1,19 @@
+/*
+ * Copyright 2026 Oleg Borodin <onborodin@gmail.com>
+ *
+ * This work is published and licensed under a Creative Commons
+ * Attribution-NonCommercial-NoDerivatives 4.0 International License.
+ *
+ * Distribution of this work is permitted, but commercial use and
+ * modifications are strictly prohibited.
+ */
+package imageoper
+
+const (
+	ddmMediaType = "application/vnd.docker.distribution.manifest.v2+json"
+	oimMediaType = "application/vnd.oci.image.manifest.v1+json"
+	oiiMediaType = "application/vnd.oci.image.index.v1+json"
+
+	XXXoicMediaType = "application/vnd.oci.image.config.v1+json"
+	XXXdciMediaType = "application/vnd.docker.container.image.v1+json"
+)

app/imageoper/ociaux.go

@@ -21,11 +21,6 @@ import (
 	ocispec "github.com/opencontainers/image-spec/specs-go/v1"
 )
 
-const (
-	oiiMediaType = "application/vnd.oci.image.index.v1+json"
-	oimMediaType = "application/vnd.oci.image.manifest.v1+json"
-)
-
 func indexFromManigestDescrs(mandescrs []descr.Manifest) (ocispec.Index, []byte, error) {
 	var err error
 	var indexdata []byte
@@ -37,6 +32,10 @@ func indexFromManigestDescrs(mandescrs []descr.Manifest) (ocispec.Index, []byte,
 	for _, mandescr := range mandescrs {
 		var man ocispec.Manifest
 
+		if mandescr.ContentType != oimMediaType && mandescr.ContentType != ddmMediaType {
+			continue
+		}
+
 		man.Subject = &ocispec.Descriptor{}
 		man.Subject.Platform = &ocispec.Platform{}
 		man.Config = ocispec.Descriptor{}

app/imageoper/putman.go

@@ -33,14 +33,6 @@ type PutManifestResult struct {
 	Location string
 }
 
-const (
-	ddmMimeType = "application/vnd.docker.distribution.manifest.v2+json"
-	oimMimeType = "application/vnd.oci.image.manifest.v1+json"
-
-	XXXoicMimeType = "application/vnd.oci.image.config.v1+json"
-	XXXdciMimeType = "application/vnd.docker.container.image.v1+json"
-)
-
 // TODO: lock for the name-reference or simular?
 func (oper *Operator) PutManifest(ctx context.Context, params *PutManifestParams) (*PutManifestResult, int, error) {
 	var err error
@@ -55,7 +47,7 @@ func (oper *Operator) PutManifest(ctx context.Context, params *PutManifestParams
 		return res, http.StatusBadRequest, err
 	}
 	// Check Content-Type
-	if params.ContentType != oimMimeType && params.ContentType != ddmMimeType {
+	if params.ContentType != oimMediaType && params.ContentType != ddmMediaType {
 		err = fmt.Errorf("Unknown or empty Content-Type: %s", params.ContentType)
 		return res, http.StatusNotFound, err
 	}