Merge pull request #9215 from brave/bugfix/fingerprinting/dark-mode-settings

Bugfix: dark mode broken for settings when strict fingerprinting

browser/brave_content_browser_client.cc

@@ -691,12 +691,14 @@ bool BraveContentBrowserClient::OverrideWebPreferencesAfterNavigation(
           web_contents, prefs);
   Profile* profile =
       Profile::FromBrowserContext(web_contents->GetBrowserContext());
+  const GURL url = web_contents->GetLastCommittedURL();
+  const bool shields_up = brave_shields::GetBraveShieldsEnabled(
+      HostContentSettingsMapFactory::GetForProfile(profile), url);
   auto fingerprinting_type = brave_shields::GetFingerprintingControlType(
-      HostContentSettingsMapFactory::GetForProfile(profile),
-      web_contents->GetLastCommittedURL());
+      HostContentSettingsMapFactory::GetForProfile(profile), url);
   // https://github.com/brave/brave-browser/issues/15265
   // Always use color scheme Light if fingerprinting mode strict
-  if (fingerprinting_type == ControlType::BLOCK) {
+  if (shields_up && fingerprinting_type == ControlType::BLOCK) {
     prefs->preferred_color_scheme = blink::mojom::PreferredColorScheme::kLight;
     changed = true;
   }

browser/farbling/brave_dark_mode_fingerprint_protection_browsertest.cc

@@ -27,6 +27,9 @@
 using brave_shields::ControlType;
 
 const char kEmbeddedTestServerDirectory[] = "dark_mode_block";
+const char kMatchDarkMode[] =
+    "window.domAutomationController.send(window.matchMedia('(prefers-color-"
+    "scheme: dark)').matches)";
 
 class BraveDarkModeFingerprintProtection : public InProcessBrowserTest {
  public:
@@ -143,3 +146,14 @@ IN_PROC_BROWSER_TEST_F(BraveDarkModeFingerprintProtection, RegressionCheck) {
   ASSERT_TRUE(ui_test_utils::GetCurrentTabTitle(browser(), &tab_title));
   EXPECT_EQ(base::ASCIIToUTF16("light"), tab_title);
 }
+
+IN_PROC_BROWSER_TEST_F(BraveDarkModeFingerprintProtection, SettingsPagesCheck) {
+  // On settings page should get dark mode with fingerprinting strict
+  test_theme_.SetDarkMode(true);
+  BlockFingerprinting();
+  NavigateToURLUntilLoadStop(GURL("brave://settings"));
+  bool result;
+  ASSERT_TRUE(content::ExecuteScriptAndExtractBool(contents(), kMatchDarkMode,
+                                                   &result));
+  EXPECT_TRUE(result);
+}