[tbb-commits] [tor-browser] branch tor-browser-91.9.0esr-11.5-1 updated: fixup! Bug 40309: Avoid using regional OS locales

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richard pushed a commit to branch tor-browser-91.9.0esr-11.5-1
in repository tor-browser.

The following commit(s) were added to refs/heads/tor-browser-91.9.0esr-11.5-1 by this push:
     new 65b1177a09f91 fixup! Bug 40309: Avoid using regional OS locales
65b1177a09f91 is described below

commit 65b1177a09f919d62f21d0b9ba35e165f4675a14
Author: Pier Angelo Vendrame <pierov at torproject.org>
AuthorDate: Wed May 18 19:22:37 2022 +0200

    fixup! Bug 40309: Avoid using regional OS locales
    
    Avoid regional OS locales if the pref
    `intl.regional_prefs.use_os_locales` is false but RFP is enabled.
---
 intl/locale/LocaleService.cpp | 34 ++++++++++++++++++++++++++++++----
 1 file changed, 30 insertions(+), 4 deletions(-)

diff --git a/intl/locale/LocaleService.cpp b/intl/locale/LocaleService.cpp
index ac001ee98991c..10342c6024998 100644
--- a/intl/locale/LocaleService.cpp
+++ b/intl/locale/LocaleService.cpp
@@ -15,6 +15,7 @@
 #include "mozilla/intl/OSPreferences.h"
 #include "nsDirectoryService.h"
 #include "nsDirectoryServiceDefs.h"
+#include "nsContentUtils.h"
 #include "nsIObserverService.h"
 #include "nsStringEnumerator.h"
 #include "nsXULAppAPI.h"
@@ -447,11 +448,36 @@ LocaleService::GetRegionalPrefsLocales(nsTArray<nsCString>& aRetVal) {
 
   // If the user specified that they want to use OS Regional Preferences
   // locales, try to retrieve them and use.
-  if (useOSLocales) {
-    if (NS_SUCCEEDED(
+  if (useOSLocales && NS_SUCCEEDED(
             OSPreferences::GetInstance()->GetRegionalPrefsLocales(aRetVal))) {
-      return NS_OK;
-    }
+    return NS_OK;
+  }
+  if (useOSLocales || nsContentUtils::ShouldResistFingerprinting()) {
+    // If we fail to retrieve them, or we have RFP enabled, just return the app
+    // locales.
+    GetAppLocalesAsBCP47(aRetVal);
+    return NS_OK;
+  }
+
+  // Otherwise, fetch OS Regional Preferences locales and compare the first one
+  // to the app locale. If the language subtag matches, we can safely use
+  // the OS Regional Preferences locale.
+  //
+  // This facilitates scenarios such as Firefox in "en-US" and User sets
+  // regional prefs to "en-GB".
+  nsAutoCString appLocale;
+  AutoTArray<nsCString, 10> regionalPrefsLocales;
+  LocaleService::GetInstance()->GetAppLocaleAsBCP47(appLocale);
+
+  if (NS_FAILED(OSPreferences::GetInstance()->GetRegionalPrefsLocales(
+          regionalPrefsLocales))) {
+    GetAppLocalesAsBCP47(aRetVal);
+    return NS_OK;
+  }
+
+  if (LocaleService::LanguagesMatch(appLocale, regionalPrefsLocales[0])) {
+    aRetVal = regionalPrefsLocales.Clone();
+    return NS_OK;
   }
 
   // Otherwise use the app locales.

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