Set cookie to persist language choices across sessions.

Author: rtibbles

kolibri/core/urls.py

@@ -33,11 +33,13 @@
 from __future__ import absolute_import, print_function, unicode_literals
 
 from django.conf import settings
-from django.conf.urls import include, url
+from django.conf.urls import url
 from django.conf.urls.static import static
 from kolibri.content.utils import paths
 from kolibri.plugins.registry import get_urls as plugin_urls
 
+from .views import set_language
+
 app_name = 'kolibri'
 
 
@@ -46,4 +48,4 @@
 urlpatterns += static(paths.get_content_storage_url("/"), document_root=settings.CONTENT_STORAGE_DIR)
 urlpatterns += static(paths.get_content_database_url("/"), document_root=settings.CONTENT_DATABASE_DIR)
 
-urlpatterns += [url(r'^i18n/', include('django.conf.urls.i18n'))]
+urlpatterns += [url(r'^i18n/setlang/$', set_language, name='set_language')]

kolibri/core/views.py

@@ -0,0 +1,39 @@
+from django import http
+from django.conf import settings
+from django.core.urlresolvers import translate_url
+from django.utils.http import is_safe_url
+from django.utils.translation import LANGUAGE_SESSION_KEY, check_for_language
+from django.views.i18n import LANGUAGE_QUERY_PARAMETER
+
+
+# Modified from django.views.i18n
+def set_language(request):
+    """
+    Redirect to a given url while setting the chosen language in the
+    session or cookie. The url and the language code need to be
+    specified in the request parameters.
+    Since this view changes how the user will see the rest of the site, it must
+    only be accessed as a POST request. If called as a GET request, it will
+    redirect to the page in the request (the 'next' parameter) without changing
+    any state.
+    """
+    next = request.POST.get('next', request.GET.get('next'))
+    if not is_safe_url(url=next, host=request.get_host()):
+        next = request.META.get('HTTP_REFERER')
+        if not is_safe_url(url=next, host=request.get_host()):
+            next = '/'
+    response = http.HttpResponseRedirect(next)
+    if request.method == 'POST':
+        lang_code = request.POST.get(LANGUAGE_QUERY_PARAMETER)
+        if lang_code and check_for_language(lang_code):
+            next_trans = translate_url(next, lang_code)
+            if next_trans != next:
+                response = http.HttpResponseRedirect(next_trans)
+            if hasattr(request, 'session'):
+                request.session[LANGUAGE_SESSION_KEY] = lang_code
+            # Always set cookie
+            response.set_cookie(settings.LANGUAGE_COOKIE_NAME, lang_code,
+                                max_age=settings.LANGUAGE_COOKIE_AGE,
+                                path=settings.LANGUAGE_COOKIE_PATH,
+                                domain=settings.LANGUAGE_COOKIE_DOMAIN)
+    return response