Bug 1637194 - P2. Set firstPartyDomain to CookieJarSetting in nsHttpChannel::AsyncOpen r=necko-reviewers,timhuang,baku,kershaw

FirstPartyDomain is only set while loading a top-level document.
We added in nsHttpChannel::AsyncOpen to ensure that the value is updated
whenever we open a channel.

Differential Revision: https://phabricator.services.mozilla.com/D75277

netwerk/ipc/DocumentLoadListener.cpp

@@ -433,6 +433,7 @@ bool DocumentLoadListener::Open(
     httpBaseChannel->SetTopWindowURI(topWindowURI);
   }
 
+  // TODO: Remove this in Bug 1639140
   Unused << loadInfo->SetHasStoragePermission(
       AntiTrackingUtils::HasStoragePermissionInParent(mChannel));
 

netwerk/protocol/http/nsHttpChannel.cpp

@@ -1857,6 +1857,25 @@ void nsHttpChannel::SetCachedContentType() {
   mCacheEntry->SetContentType(contentType);
 }
 
+void nsHttpChannel::UpdateAntiTrackingInfo() {
+  Unused << mLoadInfo->SetHasStoragePermission(
+      AntiTrackingUtils::HasStoragePermissionInParent(this));
+
+  AntiTrackingUtils::ComputeIsThirdPartyToTopWindow(this);
+
+  // We only need to set FPD for top-level loads. FPD will automatically be
+  // propagated to non-top level loads via CookieJarSetting.
+  if (mLoadInfo->GetExternalContentPolicyType() ==
+      nsIContentPolicy::TYPE_DOCUMENT) {
+    nsCOMPtr<nsICookieJarSettings> cookieJarSettings;
+    Unused << mLoadInfo->GetCookieJarSettings(
+        getter_AddRefs(cookieJarSettings));
+
+    mozilla::net::CookieJarSettings::Cast(cookieJarSettings)
+        ->SetFirstPartyDomain(mURI);
+  }
+}
+
 nsresult nsHttpChannel::CallOnStartRequest() {
   LOG(("nsHttpChannel::CallOnStartRequest [this=%p]", this));
 
@@ -6506,11 +6525,6 @@ nsHttpChannel::AsyncOpen(nsIStreamListener* aListener) {
     return NS_ERROR_NOT_AVAILABLE;
   }
 
-  Unused << mLoadInfo->SetHasStoragePermission(
-      AntiTrackingUtils::HasStoragePermissionInParent(this));
-
-  AntiTrackingUtils::ComputeIsThirdPartyToTopWindow(this);
-
   static bool sRCWNInited = false;
   if (!sRCWNInited) {
     sRCWNInited = true;
@@ -6542,6 +6556,8 @@ nsHttpChannel::AsyncOpen(nsIStreamListener* aListener) {
     UpdatePrivateBrowsing();
   }
 
+  UpdateAntiTrackingInfo();
+
   if (WaitingForTailUnblock()) {
     // This channel is marked as Tail and is part of a request context
     // that has positive number of non-tailed requestst, hence this channel

netwerk/protocol/http/nsHttpChannel.h

@@ -569,6 +569,11 @@ class nsHttpChannel final : public HttpBaseChannel,
   // writing a new entry. The content type is used in cache internally only.
   void SetCachedContentType();
 
+  // This function updates all the fields used by anti-tracking when a channel
+  // is opened. We have to do this in the parent to access cross-origin info
+  // that is not exposed to child processes.
+  void UpdateAntiTrackingInfo();
+
  private:
   // this section is for main-thread-only object
   // all the references need to be proxy released on main thread.