add origin to location and url api

components/script/dom/urlhelper.rs

@@ -6,7 +6,7 @@ use dom::bindings::str::USVString;
 use std::borrow::ToOwned;
 use std::fmt::Write;
 use url::urlutils::{UrlUtils, UrlUtilsWrapper};
-use url::{SchemeData, Url, UrlParser};
+use url::{Origin, SchemeData, Url, UrlParser};
 
 #[derive(HeapSizeOf)]
 pub struct UrlHelper;
@@ -43,6 +43,34 @@ impl UrlHelper {
         let _ = wrapper.set_host(&value.0);
     }
 
+    pub fn Origin(url: &Url) -> USVString {
+        USVString(match url.origin() {
+            Origin::UID(_) => {
+                // https://html.spec.whatwg.org/multipage/#unicode-serialisation-of-an-origin
+                // If the origin in question is not a scheme/host/port tuple,
+                // then return the literal string "null" and abort these steps.
+                "null".to_owned()
+            },
+            Origin::Tuple(protocol, host, _) => {
+                let mut origin =
+                    format!(
+                        "{protocol}://{host}",
+                        protocol = protocol,
+                        host = host
+                    );
+                if let Some(port) =
+                    // https://html.spec.whatwg.org/multipage/#unicode-serialisation-of-an-origin
+                    // only append the port # to the serialized origin if the port is different from
+                    // the default port for the protocol. If url.scheme_data.port is None, that
+                    // indicates that the port is a default port
+                    url.relative_scheme_data().and_then(|scheme| scheme.port) {
+                        write!(origin, ":{}", port).unwrap();
+                    };
+                origin
+            }
+        })
+    }
+
     pub fn Hostname(url: &Url) -> USVString {
         USVString(url.serialize_host().unwrap_or_else(|| "".to_owned()))
     }