added file checker, completation/size/digest

pkg/filecli/checkfiles.go

@@ -0,0 +1,60 @@
+/*
+ * Copyright 2026 Oleg Borodin <onborodin@gmail.com>
+ */
+package filecli
+
+import (
+	"bytes"
+	"context"
+	"fmt"
+	"net/http"
+	"strconv"
+)
+
+func (cli *Client) CheckFiles(ctx context.Context, rawpath string) ([]byte, error) {
+	var err error
+	var list []byte
+
+	ref, err := ParsePath(rawpath)
+	if err != nil {
+		return list, err
+	}
+	uri := ref.FilesEP()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, uri, nil)
+	if err != nil {
+		return list, err
+	}
+	req.Header.Set("User-Agent", cli.userAgent)
+	req.Header.Set("Accept", "*/*")
+	resp, err := cli.httpClient.Do(req)
+	if err != nil {
+		return list, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode == http.StatusNotFound {
+		return list, err
+	}
+	if resp.StatusCode != http.StatusOK {
+		err := fmt.Errorf("Unexpected response code %s", resp.Status)
+		return list, err
+	}
+	contentLength := resp.Header.Get("Content-Length")
+	if contentLength == "" {
+		err := fmt.Errorf("Content-Length header is missing")
+		return list, err
+	}
+	blobSize, err := strconv.ParseInt(contentLength, 10, 64)
+	if err != nil {
+		return list, err
+	}
+	buffer := bytes.NewBuffer(nil)
+	recSize, err := Copy(ctx, buffer, resp.Body)
+	if blobSize != recSize {
+		err := fmt.Errorf("Mismatch declared and actual body size: %d and %d", blobSize, recSize)
+		return list, err
+	}
+	list = buffer.Bytes()
+	return list, err
+}

pkg/filecli/referer.go

@@ -91,6 +91,11 @@ func (ref *Referer) CollectionsEP() string {
 	return curl.String()
 }
 
+func (ref *Referer) CheckEP() string {
+	curl := ref.urlobj.JoinPath("/v3/api/checker/", ref.resource)
+	return curl.String()
+}
+
 func (ref *Referer) Userinfo() (string, string) {
 	return ref.user, ref.pass
 }