splitted app/imageoper/manififest.go

app/imageoper/manexist.go

@@ -0,0 +1,77 @@
+/*
+ * 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 ManifestExistsParams struct {
+	Name      string
+	Reference string
+}
+type ManifestExistsResult struct {
+	ContentLength       string
+	ContentType         string
+	DockerContentDigest string
+	Exists              bool
+}
+
+func (oper *Operator) ManifestExists(ctx context.Context, params *ManifestExistsParams) (*ManifestExistsResult, int, error) {
+	var err error
+	res := &ManifestExistsResult{}
+
+	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
+	}
+
+	var manifest descr.Manifest
+	manifests := make([]descr.Manifest, 0)
+	var exists bool
+	if stringLikeSHA256Digest(params.Reference) {
+		digest := fmt.Sprintf("%s:%s", sha256prefix, params.Reference)
+		exists, manifest, err = oper.mdb.GetManifestByDigest(ctx, params.Name, digest)
+		if err != nil {
+			return res, http.StatusInternalServerError, err
+		}
+		if !exists {
+			return res, http.StatusNotFound, err
+		}
+	} else {
+		exists, manifests, err = oper.mdb.GetManifestsByReference(ctx, params.Name, params.Reference)
+		if err != nil {
+			return res, http.StatusInternalServerError, err
+		}
+		if !exists {
+			return res, http.StatusNotFound, err
+		}
+		manifest = manifests[0] // TODO: tmp
+	}
+
+	digest := auxoci.SHA256DigestFromString(manifest.Payload)
+	payloadSize := len(manifest.Payload)
+	res.ContentLength = strconv.FormatInt(int64(payloadSize), 10)
+	res.ContentType = manifest.ContentType
+	res.DockerContentDigest = digest.String()
+	res.Exists = exists
+
+	return res, http.StatusOK, err
+}