openapi2conv: expose loader and location to ToV3

openapi2conv/openapi2_conv.go

@@ -13,6 +13,10 @@ import (
 
 // ToV3 converts an OpenAPIv2 spec to an OpenAPIv3 spec
 func ToV3(doc2 *openapi2.T) (*openapi3.T, error) {
+	return ToV3WithLoader(doc2, openapi3.NewLoader(), nil)
+}
+
+func ToV3WithLoader(doc2 *openapi2.T, loader *openapi3.Loader, location *url.URL) (*openapi3.T, error) {
 	doc3 := &openapi3.T{
 		OpenAPI:      "3.0.3",
 		Info:         &doc2.Info,
@@ -107,8 +111,7 @@ func ToV3(doc2 *openapi2.T) (*openapi3.T, error) {
 
 	doc3.Security = ToV3SecurityRequirements(doc2.Security)
 	{
-		sl := openapi3.NewLoader()
-		if err := sl.ResolveRefsIn(doc3, nil); err != nil {
+		if err := loader.ResolveRefsIn(doc3, location); err != nil {
 			return nil, err
 		}
 	}