From 7812491622fc50022065992edd69b420060ace5b Mon Sep 17 00:00:00 2001
From: Tim Huang <tihuang@mozilla.com>
Date: Wed, 26 Jul 2023 10:14:37 +0000
Subject: [PATCH] Bug 1842030 - Part 1: Adding
 CanonicalBrowsingContext::IsPrivateBrowsingActive(). r=nika

The CanonicalBrowsingContext::IsPrivateBrowsingActive() function allows
us to know if private browsing is active. We need it to prevent setting
cookies if there is no active private browsing session.

Differential Revision: https://phabricator.services.mozilla.com/D184010
---
 docshell/base/CanonicalBrowsingContext.cpp | 5 +++++
 docshell/base/CanonicalBrowsingContext.h   | 3 +++
 2 files changed, 8 insertions(+)

diff --git a/docshell/base/CanonicalBrowsingContext.cpp b/docshell/base/CanonicalBrowsingContext.cpp
index 31c97e2680530..385d7f367c2e1 100644
--- a/docshell/base/CanonicalBrowsingContext.cpp
+++ b/docshell/base/CanonicalBrowsingContext.cpp
@@ -1433,6 +1433,11 @@ uint32_t CanonicalBrowsingContext::CountSiteOrigins(
   return uniqueSiteOrigins.Count();
 }
 
+/* static */
+bool CanonicalBrowsingContext::IsPrivateBrowsingActive() {
+  return gNumberOfPrivateContexts > 0;
+}
+
 void CanonicalBrowsingContext::UpdateMediaControlAction(
     const MediaControlAction& aAction) {
   if (IsDiscarded()) {
diff --git a/docshell/base/CanonicalBrowsingContext.h b/docshell/base/CanonicalBrowsingContext.h
index 244f95e36e8a5..3bf1db6cb2b62 100644
--- a/docshell/base/CanonicalBrowsingContext.h
+++ b/docshell/base/CanonicalBrowsingContext.h
@@ -203,6 +203,9 @@ class CanonicalBrowsingContext final : public BrowsingContext {
       GlobalObject& aGlobal,
       const Sequence<mozilla::OwningNonNull<BrowsingContext>>& aRoots);
 
+  // Return true if a private browsing session is active.
+  static bool IsPrivateBrowsingActive();
+
   // This function would propogate the action to its all child browsing contexts
   // in content processes.
   void UpdateMediaControlAction(const MediaControlAction& aAction);