1 files changed, 17 insertions, 1 deletions
diff --git a/components/script/dom/servointernals.rs b/components/script/dom/servointernals.rs
index 295bd838443..58d749d8227 100644
--- a/components/script/dom/servointernals.rs
+++ b/components/script/dom/servointernals.rs
@@ -5,7 +5,10 @@
 use std::rc::Rc;
 
 use dom_struct::dom_struct;
+use js::rust::HandleObject;
 use profile_traits::mem::MemoryReportResult;
+use script_bindings::interfaces::ServoInternalsHelpers;
+use script_bindings::script_runtime::JSContext;
 use script_traits::ScriptMsg;
 
 use crate::dom::bindings::codegen::Bindings::ServoInternalsBinding::ServoInternalsMethods;
@@ -14,7 +17,7 @@ use crate::dom::bindings::reflector::{DomGlobal, Reflector, reflect_dom_object};
 use crate::dom::bindings::root::DomRoot;
 use crate::dom::globalscope::GlobalScope;
 use crate::dom::promise::Promise;
-use crate::realms::InRealm;
+use crate::realms::{AlreadyInRealm, InRealm};
 use crate::routed_promise::{RoutedPromiseListener, route_promise};
 use crate::script_runtime::CanGc;
 
@@ -57,3 +60,16 @@ impl RoutedPromiseListener<MemoryReportResult> for ServoInternals {
         promise.resolve_native(&response.content, can_gc);
     }
 }
+
+impl ServoInternalsHelpers for ServoInternals {
+    /// The navigator.servo api is only exposed to about: pages except about:blank
+    #[allow(unsafe_code)]
+    fn is_servo_internal(cx: JSContext, _global: HandleObject) -> bool {
+        unsafe {
+            let in_realm_proof = AlreadyInRealm::assert_for_cx(cx);
+            let global_scope = GlobalScope::from_context(*cx, InRealm::Already(&in_realm_proof));
+            let url = global_scope.get_url();
+            url.scheme() == "about" && url.as_str() != "about:blank"
+        }
+    }
+}