From 71da5f62dab825e015864fd5604be46815e24ff1 Mon Sep 17 00:00:00 2001
From: Jannis Leidel <jannis@leidel.info>
Date: Tue, 16 Feb 2010 12:13:48 +0000
Subject: [PATCH] Fixed #7720 - Fallback to the base language if the sub
 language given in the language cookie doesn't exist. Thanks, djoume and
 Ramiro Morales.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@12442 bcc190cf-cafb-0310-a4f2-bffc1f526a37
---
 django/utils/translation/trans_real.py |  4 +++
 tests/regressiontests/i18n/tests.py    | 43 ++++++++++++++++++++++++++
 2 files changed, 47 insertions(+)

diff --git a/django/utils/translation/trans_real.py b/django/utils/translation/trans_real.py
index 3f13d79290..42e3bcc0d7 100644
--- a/django/utils/translation/trans_real.py
+++ b/django/utils/translation/trans_real.py
@@ -356,6 +356,10 @@ def get_language_from_request(request):
             return lang_code
 
     lang_code = request.COOKIES.get(settings.LANGUAGE_COOKIE_NAME)
+
+    if lang_code and lang_code not in supported:
+        lang_code = lang_code.split('-')[0] # e.g. if fr-ca is not supported fallback to fr
+
     if lang_code and lang_code in supported and check_for_language(lang_code):
         return lang_code
 
diff --git a/tests/regressiontests/i18n/tests.py b/tests/regressiontests/i18n/tests.py
index 212f952add..588a7b607c 100644
--- a/tests/regressiontests/i18n/tests.py
+++ b/tests/regressiontests/i18n/tests.py
@@ -454,3 +454,46 @@ class MiscTests(TestCase):
         # by Django without falling back nor ignoring it.
         r.META = {'HTTP_ACCEPT_LANGUAGE': 'zh-cn,de'}
         self.assertEqual(g(r), 'zh-cn')
+
+    def test_parse_language_cookie(self):
+        """
+        Now test that we parse language preferences stored in a cookie correctly.
+        """
+        from django.utils.translation.trans_real import get_language_from_request
+        g = get_language_from_request
+        from django.http import HttpRequest
+        r = HttpRequest
+        r.COOKIES = {settings.LANGUAGE_COOKIE_NAME: 'pt-br'}
+        r.META = {}
+        self.assertEqual('pt-br', g(r))
+
+        r.COOKIES = {settings.LANGUAGE_COOKIE_NAME: 'pt'}
+        r.META = {}
+        self.assertEqual('pt', g(r))
+
+        r.COOKIES = {settings.LANGUAGE_COOKIE_NAME: 'es'}
+        r.META = {'HTTP_ACCEPT_LANGUAGE': 'de'}
+        self.assertEqual('es', g(r))
+
+        # Python 2.3 and 2.4 return slightly different results for completely
+        # bogus locales, so we omit this test for that anything below 2.4.
+        # It's relatively harmless in any cases (GIGO). This also means this
+        # won't be executed on Jython currently, but life's like that
+        # sometimes. (On those platforms, passing in a truly bogus locale
+        # will get you the default locale back.)
+        if sys.version_info >= (2, 5):
+            # This test assumes there won't be a Django translation to a US
+            # variation of the Spanish language, a safe assumption. When the
+            # user sets it as the preferred language, the main 'es'
+            # translation should be selected instead.
+            r.COOKIES = {settings.LANGUAGE_COOKIE_NAME: 'es-us'}
+            r.META = {}
+            self.assertEqual(g(r), 'es')
+
+        # This tests the following scenario: there isn't a main language (zh)
+        # translation of Django but there is a translation to variation (zh_CN)
+        # the user sets zh-cn as the preferred language, it should be selected
+        # by Django without falling back nor ignoring it.
+        r.COOKIES = {settings.LANGUAGE_COOKIE_NAME: 'zh-cn'}
+        r.META = {'HTTP_ACCEPT_LANGUAGE': 'de'}
+        self.assertEqual(g(r), 'zh-cn')