feat: add exported constants

internal/oci/oci.go

@@ -9,6 +9,7 @@ import (
 	"github.com/containerd/containerd/platforms"
 	"github.com/distribution/reference"
 	att "github.com/docker/attest/pkg/attestation"
+	"github.com/docker/attest/pkg/types"
 	"github.com/google/go-containerregistry/pkg/authn"
 	"github.com/google/go-containerregistry/pkg/name"
 	v1 "github.com/google/go-containerregistry/pkg/v1"
@@ -71,11 +72,11 @@ func attestationManifestFromOCILayout(path string, platformStr string) (*Attesta
 		}
 	}
 	for _, mf := range mfs2.Manifests {
-		if mf.Annotations[DockerReferenceType] != AttestationManifestType {
+		if mf.Annotations[types.DockerReferenceType] != types.AttestationManifestType {
 			continue
 		}
 
-		if mf.Annotations[DockerReferenceDigest] != imageDigest {
+		if mf.Annotations[types.DockerReferenceDigest] != imageDigest {
 			continue
 		}
 

internal/oci/types.go

@@ -1,8 +1,5 @@
 package oci
 
 const (
-	DockerReferenceType     = "vnd.docker.reference.type"
-	DockerReferenceDigest   = "vnd.docker.reference.digest"
-	AttestationManifestType = "attestation-manifest"
 	InTotoPredicateType     = "in-toto.io/predicate-type"
 )

pkg/types/types.go

@@ -0,0 +1,7 @@
+package types
+
+const (
+	DockerReferenceType     = "vnd.docker.reference.type"
+	DockerReferenceDigest   = "vnd.docker.reference.digest"
+	AttestationManifestType = "attestation-manifest"
+)