Check uris before applying them

icon.go

@@ -10,9 +10,13 @@ type Icon struct {
 	URI IRI `xml:",chardata"`
 }
 
-// NewIcon creates a new Icon. It returns a *Icon.
-func NewIcon(uri string) *Icon {
-	return &Icon{URI: IRI(uri)}
+// NewIcon creates a new Icon. It returns a *Icon and an error.
+func NewIcon(uri IRI) (*Icon, error) {
+	if !isValidIRI(uri) {
+		return nil, fmt.Errorf("uri %v not correctly formatted", uri)
+	}
+
+	return &Icon{URI: uri}, nil
 }
 
 // Check checks the Icon for incompatibilities with RFC4287. It returns an