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# -*- coding: utf-8 -*-
from __future__ import with_statement
from cms.test_utils.util.context_managers import SettingsOverride
from cms.utils.i18n import get_default_language
from django.conf import settings
from django.core.urlresolvers import reverse
from django.middleware.locale import LocaleMiddleware
from django.utils import translation
import re
import urllib
import urlparse
HAS_LANG_PREFIX_RE = re.compile(r"^/(%s)/.*" % "|".join([re.escape(lang[0]) for lang in settings.CMS_LANGUAGES]))
def has_lang_prefix(path):
check = HAS_LANG_PREFIX_RE.match(path)
if check is not None:
return False
def patch_response(content, pages_root, language):
# Customarily user pages are served from
# When a user uses django-cms for his pages, the '~' of the url appears quoted in href links.
# We have to quote pages_root for the regular expression to match.
# The used regex is quite complex. The exact pattern depends on the used settings.
# The regex extracts the path of the url without the leading page root, but only matches urls
# that don't already contain a language string or aren't considered multilingual.
# Here is an annotated example pattern (_r_ is a shorthand for the value of pages_root):
# pattern: <a([^>]+)href=("|\')(?=_r_)(?!(/fr/|/de/|/en/|/pt-br/|/media/|/media/admin/))(_r_(.*?))("|\')(.*?)>
# |-\1--| |-\2-| |---------------------\3---------------------| | |-\5--|||-\6-||-\7-|
# |---\4---|
# input (_r_=/): <a href="/admin/password_change/" class="foo">
# matched groups: (u' ', None, u'/admin/password_change/', u'admin/password_change/', u' class="foo"')
# Notice that (?=...) and (?!=...) do not consume input or produce a group in the match object.
# If the regex matches, the extracted path we want is stored in the fourth group (\4).
quoted_root = urllib.quote(pages_root)
ignore_paths = ['%s%s/' % (quoted_root, lang[0]) for lang in settings.CMS_LANGUAGES]
ignore_paths += [settings.MEDIA_URL]
if getattr(settings, 'ADMIN_MEDIA_PREFIX', False):
ignore_paths += [settings.ADMIN_MEDIA_PREFIX]
if getattr(settings,'STATIC_URL', False):
ignore_paths += [settings.STATIC_URL]
HREF_URL_FIX_RE = re.compile(ur'<a([^>]+)href=("|\')(?=%s)(?!(%s))(%s(.*?))("|\')(.*?)>' % (
"|".join([re.escape(p) for p in ignore_paths]),
# Unlike in href links, the '~' (see above) the '~' in form actions appears unquoted.
# For understanding this regex, please read the documentation for HREF_URL_FIX_RE above.
ignore_paths = ['%s%s/' % (pages_root, lang[0]) for lang in settings.CMS_LANGUAGES]
ignore_paths += [settings.MEDIA_URL]
if getattr(settings, 'ADMIN_MEDIA_PREFIX', False):
ignore_paths += [settings.ADMIN_MEDIA_PREFIX]
if getattr(settings,'STATIC_URL', False):
ignore_paths += [settings.STATIC_URL]
FORM_URL_FIX_RE = re.compile(ur'<form([^>]+)action=("|\')(?=%s)(?!(%s))(%s(.*?))("|\')(.*?)>' % (
"|".join([re.escape(p) for p in ignore_paths]),
content = HREF_URL_FIX_RE.sub(ur'<a\1href=\2/%s%s\5\6\7>' % (language, pages_root), content)
content = FORM_URL_FIX_RE.sub(ur'<form\1action=\2/%s%s\5\6\7>' % (language, pages_root), content).encode("utf8")
return content
class MultilingualURLMiddleware(object):
def get_language_from_request(self, request):
prefix = has_lang_prefix(request.path_info)
lang = None
if prefix:
request.path = "/" + "/".join(request.path.split("/")[2:])
request.path_info = "/" + "/".join(request.path_info.split("/")[2:])
t = prefix
if t in settings.CMS_FRONTEND_LANGUAGES:
lang = t
if not lang:
languages = []
for frontend_lang in settings.CMS_FRONTEND_LANGUAGES:
with SettingsOverride(LANGUAGES=languages):
lang = translation.get_language_from_request(request)
if not lang:
lang = get_default_language()
old_lang = None
if hasattr(request, "session") and request.session.get("django_language", None):
old_lang = request.session["django_language"]
if not old_lang and hasattr(request, "COOKIES") and request.COOKIES.get(settings.LANGUAGE_COOKIE_NAME, None):
old_lang = request.COOKIES.get(settings.LANGUAGE_COOKIE_NAME)
if old_lang != lang:
if hasattr(request, 'session'):
request.session['django_language'] = lang
return lang
def process_request(self, request):
language = self.get_language_from_request(request)
request.LANGUAGE_CODE = language
def process_response(self, request, response):
language = getattr(request, 'LANGUAGE_CODE', self.get_language_from_request(request))
local_middleware = LocaleMiddleware()
response = local_middleware.process_response(request, response)
path = unicode(request.path)
if not hasattr(request, 'session') and request.COOKIES.get(settings.LANGUAGE_COOKIE_NAME) != language:
response.set_cookie(settings.LANGUAGE_COOKIE_NAME, language)
# note: pages_root is assumed to end in '/'.
# testing this and throwing an exception otherwise, would probably be a good idea
if (not path.startswith(settings.MEDIA_URL) and
not path.startswith(settings.STATIC_URL) and
not (getattr(settings, 'STATIC_URL', False) and path.startswith(settings.STATIC_URL)) and
response.status_code == 200 and
response.has_header('Content-Type') and
response._headers['content-type'][1].split(';')[0] == "text/html"):
pages_root = urllib.unquote(reverse("pages-root"))
decoded_response = response.content.decode('utf-8')
except UnicodeDecodeError:
decoded_response = response.content
response.content = patch_response(
if response.status_code == 301 or response.status_code == 302:
location = response['Location']
if location.startswith('.'):
location = urlparse.urljoin(request.path, location)
response['Location'] = location
if (not has_lang_prefix(location) and location.startswith("/") and
not location.startswith(settings.MEDIA_URL) and
not (getattr(settings, 'STATIC_URL', False) and location.startswith(settings.STATIC_URL))):
response['Location'] = "/%s%s" % (language, location)
if request.COOKIES.get('django_language') != language:
response.set_cookie("django_language", language)
return response
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