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