splitted app/imageoper/manififest.go

app/imageoper/getman.go

@@ -0,0 +1,102 @@
+/*
+ * 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
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"strconv"
+
+	"mstore/pkg/auxoci"
+	"mstore/pkg/descr"
+)
+
+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{}
+
+	if params.Name == "" {
+		err = fmt.Errorf("Empty name")
+		return res, http.StatusBadRequest, err
+	}
+	if params.Reference == "" {
+		err = fmt.Errorf("Empty reference")
+		return res, http.StatusBadRequest, err
+	}
+
+	resName := params.Name
+	oper.iLock.WaitAndLock(resName)
+	defer oper.iLock.Done(resName)
+
+	manifestDescr := descr.Manifest{}
+	var exists bool
+	// TODO: checking layers?
+	if stringLikeSHADigest(params.Reference) {
+		digest := normalizeSHADigest(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
+		}
+
+		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
+
+	} else {
+		// Create index of manifests
+		exists, manifestDescrs, err := oper.mdb.GetManifestsByReference(ctx, params.Name, params.Reference)
+		if err != nil {
+			return res, http.StatusInternalServerError, err
+		}
+		if !exists {
+			return res, http.StatusNotFound, err
+		}
+		/*
+			index, indexBytes, err := indexFromManigestDescrs(manifestDescrs)
+			if err != nil {
+				return res, http.StatusInternalServerError, err
+			}
+			indexDigest := auxoci.SHA256DigestFromString(indexBytes)
+			res.DockerContentDigest = indexDigest.String()
+
+			res.ContentLength = strconv.FormatInt(int64(len(indexBytes)), 10)
+			res.ContentType = index.MediaType
+			res.Payload = string(indexBytes)
+		*/
+		manifestDescr = manifestDescrs[0]
+
+		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
+}