1 files changed, 14 insertions, 0 deletions
diff --git a/components/script/dom/urlhelper.rs b/components/script/dom/urlhelper.rs
index dd22e16f551..ec50b4edb71 100644
--- a/components/script/dom/urlhelper.rs
+++ b/components/script/dom/urlhelper.rs
@@ -92,4 +92,18 @@ impl UrlHelper {
             let _ = quirks::set_username(url, &value.0);
         }
     }
+    // https://w3c.github.io/webappsec-secure-contexts/#is-origin-trustworthy
+    pub fn is_origin_trustworthy(url: &ServoUrl) -> bool {
+        // Step 3
+        if url.scheme() == "http" || url.scheme() == "wss" {
+            true
+        // Step 4
+        } else if url.host().is_some() {
+            let host = url.host_str().unwrap();
+            host == "127.0.0.0/8" || host == "::1/128"
+        // Step 5
+        } else {
+            url.scheme() == "file"
+        }
+    }
 }