Add mapping function

Signed-off-by: Yogesh Deshpande <[email protected]>

Author: yogeshbdeshpande

vts/compositeevidenceparser/compositeevidenceparser.go

@@ -0,0 +1,28 @@
+// Copyright 2026 Contributors to the Veraison project.
+// SPDX-License-Identifier: Apache-2.0
+
+package compositeevidenceparser
+
+import (
+	"fmt"
+	"mime"
+)
+
+// present MediaType to Composite Parser is maintained locally within the compositeevidenceparser package
+var mtToCeParser = map[string]ICompositeEvidenceParser{
+	"application/cmw-collection+cbor": &cmwParser{},
+	"application/cmw-collection+json": &cmwParser{},
+}
+
+func GetParserFromMediaType(mt string) (ICompositeEvidenceParser, error) {
+	// Check if its a valid mediaType
+	if _, _, err := mime.ParseMediaType(mt); err != nil {
+		return nil, fmt.Errorf("bad media type: %w", err)
+	}
+	switch mt {
+	case "application/cmw-collection+cbor", "application/cmw-collection+json":
+		return mtToCeParser[mt], nil
+	default:
+		return nil, fmt.Errorf("unsupported media type:%s", mt)
+	}
+}