Check uris before applying them

logo.go

@@ -11,8 +11,12 @@ type Logo struct {
 }
 
 // NewLogo creates a new Logo. It returns a *Logo.
-func NewLogo(uri string) *Logo {
-	return &Logo{URI: IRI(uri)}
+func NewLogo(uri IRI) (*Logo, error) {
+	if !isValidIRI(uri) {
+		return nil, fmt.Errorf("uri %v not correctly formatted", uri)
+	}
+
+	return &Logo{URI: uri}, nil
 }
 
 // Check checks the Logo for incompatibilities with RFC4287. It returns an