feat: add policy.downloadLocation

pkg/tuf/registry.go

@@ -81,7 +81,7 @@ func NewRegistryFetcher(metadataRepo, metadataTag, targetsRepo string) *Registry
 func (d *RegistryFetcher) DownloadFile(urlPath string, maxLength int64, timeout time.Duration) ([]byte, error) {
 	d.timeout = timeout
 
-	imgRef, fileName, err := d.ParseImgRef(urlPath)
+	imgRef, fileName, err := d.parseImgRef(urlPath)
 	if err != nil {
 		return nil, err
 	}
@@ -186,7 +186,7 @@ func getDataFromLayer(fileLayer v1.Layer, maxLength int64) ([]byte, error) {
 }
 
 // parseImgRef maintains the Fetcher interface by parsing a URL path to an image reference and file name.
-func (d *RegistryFetcher) ParseImgRef(urlPath string) (imgRef, fileName string, err error) {
+func (d *RegistryFetcher) parseImgRef(urlPath string) (imgRef, fileName string, err error) {
 	// Check if repo is target or metadata
 	if strings.Contains(urlPath, d.targetsRepo) {
 		// determine if the target path contains subdirectories and set image name accordingly

pkg/tuf/registry_test.go

@@ -206,7 +206,7 @@ func TestParseImgRef(t *testing.T) {
 				metadataTag:  LatestTag,
 				targetsRepo:  targetsRepo,
 			}
-			imgRef, file, err := d.ParseImgRef(tc.ref)
+			imgRef, file, err := d.parseImgRef(tc.ref)
 			assert.NoError(t, err)
 			assert.Equal(t, tc.expectedRef, imgRef)
 			assert.Equal(t, tc.expectedFile, file)

pkg/tuf/tuf.go

@@ -144,11 +144,7 @@ func (t *Client) generateTargetURI(target *metadata.TargetFiles, digest string)
 
 	switch fetcher := t.cfg.Fetcher.(type) {
 	case *RegistryFetcher:
-		ref, _, err := fetcher.ParseImgRef(fullURL)
-		if err != nil {
-			return "", fmt.Errorf("failed to parse image reference: %w", err)
-		}
-		return ref, nil
+		return fmt.Sprintf("%s@sha256:%s", t.cfg.RemoteTargetsURL, digest), nil
 	case *fetcher.DefaultFetcher:
 		return fullURL, nil
 	default: