1 files changed, 107 insertions, 0 deletions
diff --git a/toolkit/components/antitracking/bouncetrackingprotection/BounceTrackingStorageObserver.cpp b/toolkit/components/antitracking/bouncetrackingprotection/BounceTrackingStorageObserver.cpp
new file mode 100644
index 0000000000..cc9c3ce971
--- /dev/null
+++ b/toolkit/components/antitracking/bouncetrackingprotection/BounceTrackingStorageObserver.cpp
@@ -0,0 +1,107 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "BounceTrackingStorageObserver.h"
+
+#include "BounceTrackingState.h"
+#include "mozilla/Services.h"
+#include "mozilla/StaticPrefs_privacy.h"
+#include "mozilla/ClearOnShutdown.h"
+#include "mozilla/dom/CanonicalBrowsingContext.h"
+#include "nsCOMPtr.h"
+#include "nsICookieNotification.h"
+#include "nsIObserverService.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "nsICookie.h"
+
+namespace mozilla {
+
+NS_IMPL_ISUPPORTS(BounceTrackingStorageObserver, nsIObserver);
+
+nsresult BounceTrackingStorageObserver::Init() {
+  MOZ_ASSERT(XRE_IsParentProcess());
+
+  MOZ_LOG(gBounceTrackingProtectionLog, LogLevel::Debug, ("%s", __FUNCTION__));
+
+  // Add observers to listen for cookie changes.
+  nsCOMPtr<nsIObserverService> observerService =
+      mozilla::services::GetObserverService();
+  NS_ENSURE_TRUE(observerService, NS_ERROR_FAILURE);
+
+  nsresult rv = observerService->AddObserver(this, "cookie-changed", false);
+  NS_ENSURE_SUCCESS(rv, rv);
+  return observerService->AddObserver(this, "private-cookie-changed", false);
+}
+
+// nsIObserver
+NS_IMETHODIMP
+BounceTrackingStorageObserver::Observe(nsISupports* aSubject,
+                                       const char* aTopic,
+                                       const char16_t* aData) {
+  MOZ_LOG(gBounceTrackingProtectionLog, LogLevel::Verbose,
+          ("Observe topic %s", aTopic));
+
+  NS_ENSURE_TRUE(aSubject, NS_ERROR_FAILURE);
+
+  nsresult rv = NS_OK;
+  nsCOMPtr<nsICookieNotification> notification =
+      do_QueryInterface(aSubject, &rv);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  nsICookieNotification::Action action = notification->GetAction();
+  // Filter for cookies added, changed or deleted. We don't care about other
+  // actions such as clearing the entire cookie store.
+  if (action != nsICookieNotification::COOKIE_ADDED &&
+      action != nsICookieNotification::COOKIE_CHANGED &&
+      action != nsICookieNotification::COOKIE_DELETED) {
+    return NS_OK;
+  }
+
+  // Ensure the notification is associated with a BrowsingContext. It's only set
+  // for cases where a website updated a cookie.
+  RefPtr<dom::BrowsingContext> browsingContext;
+  rv = notification->GetBrowsingContext(getter_AddRefs(browsingContext));
+  NS_ENSURE_SUCCESS(rv, rv);
+  if (!browsingContext) {
+    MOZ_LOG(gBounceTrackingProtectionLog, LogLevel::Verbose,
+            ("Could not get BC for CookieNotification."));
+    return NS_OK;
+  }
+
+  // Check if the cookie is partitioned. Partitioned cookies can not be used for
+  // bounce tracking.
+  nsCOMPtr<nsICookie> cookie;
+  rv = notification->GetCookie(getter_AddRefs(cookie));
+  NS_ENSURE_SUCCESS(rv, rv);
+  MOZ_ASSERT(cookie);
+
+  if (!cookie->OriginAttributesNative().mPartitionKey.IsEmpty()) {
+    MOZ_LOG(gBounceTrackingProtectionLog, LogLevel::Verbose,
+            ("Skipping partitioned cookie."));
+    return NS_OK;
+  }
+
+  dom::BrowsingContext* topBC = browsingContext->Top();
+  dom::BrowsingContextWebProgress* webProgress =
+      topBC->Canonical()->GetWebProgress();
+  if (!webProgress) {
+    return NS_OK;
+  }
+
+  RefPtr<BounceTrackingState> bounceTrackingState =
+      webProgress->GetBounceTrackingState();
+  if (!bounceTrackingState) {
+    MOZ_LOG(gBounceTrackingProtectionLog, LogLevel::Verbose,
+            ("BC does not have BounceTrackingState."));
+    return NS_OK;
+  }
+
+  nsAutoCString baseDomain;
+  rv = notification->GetBaseDomain(baseDomain);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  return bounceTrackingState->OnCookieWrite(baseDomain);
+}
+
+}  // namespace mozilla