Add top-level creation URL for global scope (#37342)

Global scopes have two creation URLs: one for itself and one for the
"top-level" scope. It's not immediately obvious what is considered
top-level here (it is not strictly defined in the specification).

In any case, reports need the creation URL of the scope itself, not the
top-level version. Therefore, propagate this information from all
scopes, where the worker and worklets remain to pass in `None` for their
top-level scope.

Part of #37328

---------

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script/dom/dissimilaroriginwindow.rs

@@ -61,6 +61,7 @@ impl DissimilarOriginWindow {
                 global_to_clone_from.resource_threads().clone(),
                 global_to_clone_from.origin().clone(),
                 global_to_clone_from.creation_url().clone(),
+                global_to_clone_from.top_level_creation_url().clone(),
                 // FIXME(nox): The microtask queue is probably not important
                 // here, but this whole DOM interface is a hack anyway.
                 global_to_clone_from.microtask_queue().clone(),

components/script/dom/globalscope.rs

@@ -283,7 +283,11 @@ pub(crate) struct GlobalScope {
 
     /// <https://html.spec.whatwg.org/multipage/#concept-environment-creation-url>
     #[no_trace]
-    creation_url: Option<ServoUrl>,
+    creation_url: ServoUrl,
+
+    /// <https://html.spec.whatwg.org/multipage/#concept-environment-top-level-creation-url>
+    #[no_trace]
+    top_level_creation_url: Option<ServoUrl>,
 
     /// A map for storing the previous permission state read results.
     permission_state_invocation_results: DomRefCell<HashMap<PermissionName, PermissionState>>,
@@ -740,7 +744,8 @@ impl GlobalScope {
         script_to_constellation_chan: ScriptToConstellationChan,
         resource_threads: ResourceThreads,
         origin: MutableOrigin,
-        creation_url: Option<ServoUrl>,
+        creation_url: ServoUrl,
+        top_level_creation_url: Option<ServoUrl>,
         microtask_queue: Rc<MicrotaskQueue>,
         #[cfg(feature = "webgpu")] gpu_id_hub: Arc<IdentityHub>,
         inherited_secure_context: Option<bool>,
@@ -769,6 +774,7 @@ impl GlobalScope {
             timers: OnceCell::default(),
             origin,
             creation_url,
+            top_level_creation_url,
             permission_state_invocation_results: Default::default(),
             microtask_queue,
             list_auto_close_worker: Default::default(),
@@ -2474,10 +2480,15 @@ impl GlobalScope {
     }
 
     /// Get the creation_url for this global scope
-    pub(crate) fn creation_url(&self) -> &Option<ServoUrl> {
+    pub(crate) fn creation_url(&self) -> &ServoUrl {
         &self.creation_url
     }
 
+    /// Get the top_level_creation_url for this global scope
+    pub(crate) fn top_level_creation_url(&self) -> &Option<ServoUrl> {
+        &self.top_level_creation_url
+    }
+
     pub(crate) fn image_cache(&self) -> Arc<dyn ImageCache> {
         if let Some(window) = self.downcast::<Window>() {
             return window.image_cache();
@@ -3525,13 +3536,30 @@ impl GlobalScope {
         if Some(false) == self.inherited_secure_context {
             return false;
         }
-        if let Some(creation_url) = self.creation_url() {
-            if creation_url.scheme() == "blob" && Some(true) == self.inherited_secure_context {
-                return true;
-            }
-            return creation_url.is_potentially_trustworthy();
+        // Step 1. If environment is an environment settings object, then:
+        // Step 1.1. Let global be environment's global object.
+        match self.top_level_creation_url() {
+            None => {
+                // Workers and worklets don't have a top-level creation URL
+                assert!(
+                    self.downcast::<WorkerGlobalScope>().is_some() ||
+                        self.downcast::<WorkletGlobalScope>().is_some()
+                );
+                true
+            },
+            Some(top_level_creation_url) => {
+                assert!(self.downcast::<Window>().is_some());
+                // Step 2. If the result of Is url potentially trustworthy?
+                // given environment's top-level creation URL is "Potentially Trustworthy", then return true.
+                // Step 3. Return false.
+                if top_level_creation_url.scheme() == "blob" &&
+                    Some(true) == self.inherited_secure_context
+                {
+                    return true;
+                }
+                top_level_creation_url.is_potentially_trustworthy()
+            },
         }
-        false
     }
 
     /// <https://www.w3.org/TR/CSP/#get-csp-of-object>

components/script/dom/window.rs

@@ -3052,7 +3052,8 @@ impl Window {
         parent_info: Option<PipelineId>,
         viewport_details: ViewportDetails,
         origin: MutableOrigin,
-        creator_url: ServoUrl,
+        creation_url: ServoUrl,
+        top_level_creation_url: ServoUrl,
         navigation_start: CrossProcessInstant,
         webgl_chan: Option<WebGLChan>,
         #[cfg(feature = "webxr")] webxr_registry: Option<webxr_api::Registry>,
@@ -3088,7 +3089,8 @@ impl Window {
                 constellation_chan,
                 resource_threads,
                 origin,
-                Some(creator_url),
+                creation_url,
+                Some(top_level_creation_url),
                 microtask_queue,
                 #[cfg(feature = "webgpu")]
                 gpu_id_hub,

components/script/dom/workerglobalscope.rs

@@ -171,6 +171,7 @@ impl WorkerGlobalScope {
                 init.resource_threads,
                 MutableOrigin::new(init.origin),
                 init.creation_url,
+                None,
                 runtime.microtask_queue.clone(),
                 #[cfg(feature = "webgpu")]
                 gpu_id_hub,

components/script/dom/workletglobalscope.rs

@@ -104,6 +104,7 @@ impl WorkletGlobalScope {
                 script_to_constellation_chan,
                 init.resource_threads.clone(),
                 MutableOrigin::new(ImmutableOrigin::new_opaque()),
+                base_url.clone(),
                 None,
                 Default::default(),
                 #[cfg(feature = "webgpu")]

components/script/script_thread.rs

@@ -3395,6 +3395,11 @@ impl ScriptThread {
             incomplete.viewport_details,
             origin.clone(),
             final_url.clone(),
+            // TODO(37417): Set correct top-level URL here. Currently, we only specify the
+            // url of the current window. However, in case this is an iframe, we should
+            // pass in the URL from the frame that includes the iframe (which potentially
+            // is another nested iframe in a frame).
+            final_url.clone(),
             incomplete.navigation_start,
             self.webgl_chan.as_ref().map(|chan| chan.channel()),
             #[cfg(feature = "webxr")]

components/shared/constellation/from_script_message.rs

@@ -443,7 +443,7 @@ pub struct WorkerGlobalScopeInit {
     /// The origin
     pub origin: ImmutableOrigin,
     /// The creation URL
-    pub creation_url: Option<ServoUrl>,
+    pub creation_url: ServoUrl,
     /// True if secure context
     pub inherited_secure_context: Option<bool>,
 }