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django/django/middleware/locale.py
Bouke Haarsma 2bab9d6d9e Fixed #21389 -- Accept most valid language codes
By removing the 'supported' keyword from the detection methods and only relying
on a cached settings.LANGUAGES, the speed of said methods has been improved;
around 4x raw performance. This allows us to stop checking Python's incomplete
list of locales, and rely on a less restrictive regular expression for
accepting certain locales.

HTTP Accept-Language is defined as being case-insensitive, based on this fact
extra performance improvements have been made; it wouldn't make sense to
check for case differences.
2014-02-26 16:58:04 +01:00

66 lines
2.8 KiB
Python

"This is the locale selecting middleware that will look at accept headers"
from django.conf import settings
from django.core.urlresolvers import (is_valid_path, get_resolver,
LocaleRegexURLResolver)
from django.http import HttpResponseRedirect
from django.utils.cache import patch_vary_headers
from django.utils import translation
class LocaleMiddleware(object):
"""
This is a very simple middleware that parses a request
and decides what translation object to install in the current
thread context. This allows pages to be dynamically
translated to the language the user desires (if the language
is available, of course).
"""
response_redirect_class = HttpResponseRedirect
def __init__(self):
self._is_language_prefix_patterns_used = False
for url_pattern in get_resolver(None).url_patterns:
if isinstance(url_pattern, LocaleRegexURLResolver):
self._is_language_prefix_patterns_used = True
break
def process_request(self, request):
check_path = self.is_language_prefix_patterns_used()
language = translation.get_language_from_request(
request, check_path=check_path)
translation.activate(language)
request.LANGUAGE_CODE = translation.get_language()
def process_response(self, request, response):
language = translation.get_language()
language_from_path = translation.get_language_from_path(request.path_info)
if (response.status_code == 404 and not language_from_path
and self.is_language_prefix_patterns_used()):
urlconf = getattr(request, 'urlconf', None)
language_path = '/%s%s' % (language, request.path_info)
path_valid = is_valid_path(language_path, urlconf)
if (not path_valid and settings.APPEND_SLASH
and not language_path.endswith('/')):
path_valid = is_valid_path("%s/" % language_path, urlconf)
if path_valid:
language_url = "%s://%s/%s%s" % (
request.scheme, request.get_host(), language,
request.get_full_path())
return self.response_redirect_class(language_url)
if not (self.is_language_prefix_patterns_used()
and language_from_path):
patch_vary_headers(response, ('Accept-Language',))
if 'Content-Language' not in response:
response['Content-Language'] = language
return response
def is_language_prefix_patterns_used(self):
"""
Returns `True` if the `LocaleRegexURLResolver` is used
at root level of the urlpatterns, else it returns `False`.
"""
return self._is_language_prefix_patterns_used