Add creator URL, creator base URL and creator origin in browsing context

3 files changed, 135 insertions, 10 deletions

diff --git a/components/script/dom/document.rs b/components/script/dom/document.rs
index 4577835d24e..f548907d6a2 100644
--- a/components/script/dom/document.rs
+++ b/components/script/dom/document.rs
@@ -575,10 +575,19 @@ impl Document {
 
     // https://html.spec.whatwg.org/multipage/#fallback-base-url
     pub fn fallback_base_url(&self) -> ServoUrl {
-        // Step 1: iframe srcdoc (#4767).
-        // Step 2: about:blank with a creator browsing context.
-        // Step 3.
-        self.url()
+        let document_url = self.url();
+        if let Some(browsing_context) = self.browsing_context() {
+            // Step 1: If document is an iframe srcdoc document, then return the
+            // document base URL of document's browsing context's container document.
+
+            // Step 2: If document's URL is about:blank, and document's browsing
+            // context's creator base URL is non-null, then return that creator base URL.
+            if document_url.as_str() == "about:blank" && browsing_context.has_creator_base_url() {
+                return browsing_context.creator_base_url().unwrap();
+            }
+        }
+        // Step 3: Return document's URL.
+        document_url
     }
 
     // https://html.spec.whatwg.org/multipage/#document-base-url
diff --git a/components/script/dom/windowproxy.rs b/components/script/dom/windowproxy.rs
index 14f9f80e20a..23e4641c4f9 100644
--- a/components/script/dom/windowproxy.rs
+++ b/components/script/dom/windowproxy.rs
@@ -52,7 +52,7 @@ use script_traits::{
     AuxiliaryBrowsingContextLoadInfo, HistoryEntryReplacement, LoadData, LoadOrigin,
 };
 use script_traits::{NewLayoutInfo, ScriptMsg};
-use servo_url::ServoUrl;
+use servo_url::{ImmutableOrigin, ServoUrl};
 use std::cell::Cell;
 use std::ptr;
 use style::attr::parse_integer;
@@ -108,6 +108,15 @@ pub struct WindowProxy {
 
     /// https://html.spec.whatwg.org/multipage/#delaying-load-events-mode
     delaying_load_events_mode: Cell<bool>,
+
+    /// The creator browsing context's base url.
+    creator_base_url: Option<ServoUrl>,
+
+    /// The creator browsing context's url.
+    creator_url: Option<ServoUrl>,
+
+    /// The creator browsing context's origin.
+    creator_origin: Option<ImmutableOrigin>,
 }
 
 impl WindowProxy {
@@ -118,6 +127,7 @@ impl WindowProxy {
         frame_element: Option<&Element>,
         parent: Option<&WindowProxy>,
         opener: Option<BrowsingContextId>,
+        creator: CreatorBrowsingContextInfo,
     ) -> WindowProxy {
         let name = frame_element.map_or(DOMString::new(), |e| {
             e.get_string_attribute(&local_name!("name"))
@@ -135,6 +145,9 @@ impl WindowProxy {
             parent: parent.map(Dom::from_ref),
             delaying_load_events_mode: Cell::new(false),
             opener,
+            creator_base_url: creator.base_url,
+            creator_url: creator.url,
+            creator_origin: creator.origin,
         }
     }
 
@@ -146,6 +159,7 @@ impl WindowProxy {
         frame_element: Option<&Element>,
         parent: Option<&WindowProxy>,
         opener: Option<BrowsingContextId>,
+        creator: CreatorBrowsingContextInfo,
     ) -> DomRoot<WindowProxy> {
         unsafe {
             let WindowProxyHandler(handler) = window.windowproxy_handler();
@@ -173,6 +187,7 @@ impl WindowProxy {
                 frame_element,
                 parent,
                 opener,
+                creator,
             ));
 
             // The window proxy owns the browsing context.
@@ -204,6 +219,7 @@ impl WindowProxy {
         top_level_browsing_context_id: TopLevelBrowsingContextId,
         parent: Option<&WindowProxy>,
         opener: Option<BrowsingContextId>,
+        creator: CreatorBrowsingContextInfo,
     ) -> DomRoot<WindowProxy> {
         unsafe {
             let handler = CreateWrapperProxyHandler(&XORIGIN_PROXY_HANDLER);
@@ -219,6 +235,7 @@ impl WindowProxy {
                 None,
                 parent,
                 opener,
+                creator,
             ));
 
             // Create a new dissimilar-origin window.
@@ -368,6 +385,33 @@ impl WindowProxy {
         self.is_closing.get()
     }
 
+    /// https://html.spec.whatwg.org/multipage/browsers.html#creator-base-url
+    pub fn creator_base_url(&self) -> Option<ServoUrl> {
+        self.creator_base_url.clone()
+    }
+
+    pub fn has_creator_base_url(&self) -> bool {
+        self.creator_base_url.is_some()
+    }
+
+    /// https://html.spec.whatwg.org/multipage/browsers.html#creator-url
+    pub fn creator_url(&self) -> Option<ServoUrl> {
+        self.creator_url.clone()
+    }
+
+    pub fn has_creator_url(&self) -> bool {
+        self.creator_base_url.is_some()
+    }
+
+    /// https://html.spec.whatwg.org/multipage/browsers.html#creator-origin
+    pub fn creator_origin(&self) -> Option<ImmutableOrigin> {
+        self.creator_origin.clone()
+    }
+
+    pub fn has_creator_origin(&self) -> bool {
+        self.creator_origin.is_some()
+    }
+
     #[allow(unsafe_code)]
     // https://html.spec.whatwg.org/multipage/#dom-opener
     pub fn opener(&self, cx: *mut JSContext, in_realm_proof: InRealm) -> JSVal {
@@ -378,6 +422,7 @@ impl WindowProxy {
             Some(opener_browsing_context_id) => opener_browsing_context_id,
             None => return NullValue(),
         };
+        let parent_browsing_context = self.parent.as_deref();
         let opener_proxy = match ScriptThread::find_window_proxy(opener_id) {
             Some(window_proxy) => window_proxy,
             None => {
@@ -389,12 +434,15 @@ impl WindowProxy {
                     Some(opener_top_id) => {
                         let global_to_clone_from =
                             unsafe { GlobalScope::from_context(cx, in_realm_proof) };
+                        let creator =
+                            CreatorBrowsingContextInfo::from(parent_browsing_context, None);
                         WindowProxy::new_dissimilar_origin(
                             &*global_to_clone_from,
                             opener_id,
                             opener_top_id,
                             None,
                             None,
+                            creator,
                         )
                     },
                     None => return NullValue(),
@@ -655,6 +703,56 @@ impl WindowProxy {
     }
 }
 
+/// A browsing context can have a creator browsing context, the browsing context that
+/// was responsible for its creation. If a browsing context has a parent browsing context,
+/// then that is its creator browsing context. Otherwise, if the browsing context has an
+/// opener browsing context, then that is its creator browsing context. Otherwise, the
+/// browsing context has no creator browsing context.
+///
+/// If a browsing context A has a creator browsing context, then the Document that was the
+/// active document of that creator browsing context at the time A was created is the creator
+/// Document.
+///
+/// See: https://html.spec.whatwg.org/multipage/browsers.html#creating-browsing-contexts
+#[derive(Debug, Deserialize, Serialize)]
+pub struct CreatorBrowsingContextInfo {
+    /// Creator document URL.
+    url: Option<ServoUrl>,
+
+    /// Creator document base URL.
+    base_url: Option<ServoUrl>,
+
+    /// Creator document origin.
+    origin: Option<ImmutableOrigin>,
+}
+
+impl CreatorBrowsingContextInfo {
+    pub fn from(
+        parent: Option<&WindowProxy>,
+        opener: Option<&WindowProxy>,
+    ) -> CreatorBrowsingContextInfo {
+        let creator = if parent.is_some() {
+            parent.unwrap().document()
+        } else if opener.is_some() {
+            opener.unwrap().document()
+        } else {
+            None
+        };
+
+        let base_url = creator.as_deref().map(|document| document.base_url());
+        let url = creator.as_deref().map(|document| document.url());
+        let origin = creator
+            .as_deref()
+            .map(|document| document.origin().immutable().clone());
+
+        CreatorBrowsingContextInfo {
+            base_url,
+            url,
+            origin,
+        }
+    }
+}
+
 // https://html.spec.whatwg.org/multipage/#concept-window-open-features-tokenize
 fn tokenize_open_features(features: DOMString) -> IndexMap<String, String> {
     let is_feature_sep = |c: char| c.is_ascii_whitespace() || ['=', ','].contains(&c);
diff --git a/components/script/script_thread.rs b/components/script/script_thread.rs
index 6a2c4b09c1e..41dc5406b4a 100644
--- a/components/script/script_thread.rs
+++ b/components/script/script_thread.rs
@@ -68,7 +68,7 @@ use crate::dom::servoparser::{ParserContext, ServoParser};
 use crate::dom::transitionevent::TransitionEvent;
 use crate::dom::uievent::UIEvent;
 use crate::dom::window::{ReflowReason, Window};
-use crate::dom::windowproxy::WindowProxy;
+use crate::dom::windowproxy::{CreatorBrowsingContextInfo, WindowProxy};
 use crate::dom::worker::TrustedWorkerAddress;
 use crate::dom::worklet::WorkletThreadPool;
 use crate::dom::workletglobalscope::WorkletGlobalScopeInit;
@@ -3162,7 +3162,7 @@ impl ScriptThread {
             return Some(DomRoot::from_ref(window_proxy));
         }
 
-        let parent = parent_pipeline_id.and_then(|parent_id| {
+        let parent_browsing_context = parent_pipeline_id.and_then(|parent_id| {
             self.remote_window_proxy(
                 global_to_clone,
                 top_level_browsing_context_id,
@@ -3170,12 +3170,21 @@ impl ScriptThread {
                 opener,
             )
         });
+
+        let opener_browsing_context = opener.and_then(|id| ScriptThread::find_window_proxy(id));
+
+        let creator = CreatorBrowsingContextInfo::from(
+            parent_browsing_context.as_deref(),
+            opener_browsing_context.as_deref(),
+        );
+
         let window_proxy = WindowProxy::new_dissimilar_origin(
             global_to_clone,
             browsing_context_id,
             top_level_browsing_context_id,
-            parent.as_deref(),
+            parent_browsing_context.as_deref(),
             opener,
+            creator,
         );
         self.window_proxies
             .borrow_mut()
@@ -3207,7 +3216,7 @@ impl ScriptThread {
                 .borrow()
                 .find_iframe(parent_id, browsing_context_id)
         });
-        let parent = match (parent_info, iframe.as_ref()) {
+        let parent_browsing_context = match (parent_info, iframe.as_ref()) {
             (_, Some(iframe)) => Some(window_from_node(&**iframe).window_proxy()),
             (Some(parent_id), _) => self.remote_window_proxy(
                 window.upcast(),
@@ -3217,13 +3226,22 @@ impl ScriptThread {
             ),
             _ => None,
         };
+
+        let opener_browsing_context = opener.and_then(|id| ScriptThread::find_window_proxy(id));
+
+        let creator = CreatorBrowsingContextInfo::from(
+            parent_browsing_context.as_deref(),
+            opener_browsing_context.as_deref(),
+        );
+
         let window_proxy = WindowProxy::new(
             &window,
             browsing_context_id,
             top_level_browsing_context_id,
             iframe.as_deref().map(Castable::upcast),
-            parent.as_deref(),
+            parent_browsing_context.as_deref(),
             opener,
+            creator,
         );
         self.window_proxies
             .borrow_mut()