working commit

app/operator/imgaux.go

@@ -6,6 +6,20 @@ import (
 )
 
 const sha256prefix = "sha256:"
+const sha512prefix = "sha512:"
+
+func normalizeSHADigest(digest string) string {
+	if stringLikeSHA256Digest(digest) && !strings.HasPrefix(digest, sha256prefix) {
+		digest = sha256prefix + digest
+	} else if stringLikeSHA512Digest(digest) && !strings.HasPrefix(digest, sha512prefix) {
+		digest = sha512prefix + digest
+	}
+	return digest
+}
+
+func stringLikeSHADigest(some string) bool {
+	return stringLikeSHA256Digest(some) || stringLikeSHA512Digest(some)
+}
 
 func stringLikeSHA256Digest(some string) bool {
 	if strings.HasPrefix(some, sha256prefix) {
@@ -20,3 +34,17 @@ func stringLikeSHA256Digest(some string) bool {
 	}
 	return false
 }
+
+func stringLikeSHA512Digest(some string) bool {
+	if strings.HasPrefix(some, sha512prefix) {
+		some = strings.TrimPrefix(some, sha512prefix)
+	}
+	_, err := hex.DecodeString(some)
+	if err != nil {
+		return false
+	}
+	if len(some) == 128 {
+		return true
+	}
+	return false
+}

app/operator/manifest.go

@@ -11,8 +11,6 @@ import (
 
 	"mstore/app/descr"
 	"mstore/pkg/auxoci"
-
-	ocidigest "github.com/opencontainers/go-digest"
 )
 
 const (
@@ -69,7 +67,7 @@ func (oper *Operator) ManifestExists(ctx context.Context, params *ManifestExists
 		}
 	}
 
-	digest := ocidigest.SHA256.FromString(manifest.Payload)
+	digest := auxoci.SHA256DigestFromString(manifest.Payload)
 	payloadSize := len(manifest.Payload)
 	res.ContentLength = strconv.FormatInt(int64(payloadSize), 10)
 	res.ContentType = manifest.ContentType
@@ -227,3 +225,52 @@ func (oper *Operator) PutManifest(ctx context.Context, params *PutManifestParams
 	return res, http.StatusCreated, err
 
 }
+
+type GetManifestParams struct {
+	Name      string
+	Reference string
+}
+type GetManifestResult struct {
+	ContentLength       string
+	ContentType         string
+	DockerContentDigest string
+	Payload             string
+}
+
+func (oper *Operator) GetManifest(ctx context.Context, params *GetManifestParams) (*GetManifestResult, int, error) {
+	var err error
+	res := &GetManifestResult{}
+	oper.logg.Debugf("Get manifest %s:%s", params.Name, params.Reference)
+
+	manifestDescr := descr.Manifest{}
+	var exists bool
+	if stringLikeSHADigest(params.Reference) {
+		digest := normalizeSHADigest(params.Reference)
+		oper.logg.Debugf("Get manifest %s with digest %s", params.Name, params.Reference)
+		exists, manifestDescr, err = oper.mdb.GetManifestByDigest(ctx, params.Name, digest)
+		if err != nil {
+			return res, http.StatusInternalServerError, err
+		}
+		if !exists {
+			return res, http.StatusNotFound, err
+		}
+	} else {
+		oper.logg.Debugf("Get manifest %s with tag %s", params.Name, params.Reference)
+		exists, manifestDescr, err = oper.mdb.GetManifestByReference(ctx, params.Name, params.Reference)
+		if err != nil {
+			return res, http.StatusInternalServerError, err
+		}
+		if !exists {
+			return res, http.StatusNotFound, err
+		}
+	}
+
+	manifestDigest := auxoci.SHA256DigestFromString(manifestDescr.Payload)
+	res.DockerContentDigest = manifestDigest.String()
+
+	res.ContentLength = strconv.FormatInt(int64(len(manifestDescr.Payload)), 10)
+	res.ContentType = manifestDescr.ContentType
+	res.Payload = manifestDescr.Payload
+
+	return res, http.StatusOK, err
+}