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eeed488a34
get_language_from_request() uses Accept-Language and/or Cookie to determine the correct redirect. Upstream caches need the matching Vary header to cache the result.
67 lines
3.2 KiB
Python
67 lines
3.2 KiB
Python
from django.conf import settings
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from django.conf.urls.i18n import is_language_prefix_patterns_used
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from django.http import HttpResponseRedirect
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from django.urls import get_script_prefix, is_valid_path
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from django.utils import translation
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from django.utils.cache import patch_vary_headers
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from django.utils.deprecation import MiddlewareMixin
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class LocaleMiddleware(MiddlewareMixin):
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"""
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Parse a request and decide what translation object to install in the
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current thread context. This allows pages to be dynamically translated to
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the language the user desires (if the language is available).
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"""
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response_redirect_class = HttpResponseRedirect
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def process_request(self, request):
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urlconf = getattr(request, 'urlconf', settings.ROOT_URLCONF)
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i18n_patterns_used, prefixed_default_language = is_language_prefix_patterns_used(urlconf)
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language = translation.get_language_from_request(request, check_path=i18n_patterns_used)
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language_from_path = translation.get_language_from_path(request.path_info)
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if not language_from_path and i18n_patterns_used and not prefixed_default_language:
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language = settings.LANGUAGE_CODE
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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(request.path_info)
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urlconf = getattr(request, 'urlconf', settings.ROOT_URLCONF)
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i18n_patterns_used, prefixed_default_language = is_language_prefix_patterns_used(urlconf)
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if (response.status_code == 404 and not language_from_path and
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i18n_patterns_used and prefixed_default_language):
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# Maybe the language code is missing in the URL? Try adding the
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# language prefix and redirecting to that URL.
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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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path_needs_slash = (
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not path_valid and (
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settings.APPEND_SLASH and not language_path.endswith('/') and
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is_valid_path('%s/' % language_path, urlconf)
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)
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)
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if path_valid or path_needs_slash:
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script_prefix = get_script_prefix()
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# Insert language after the script prefix and before the
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# rest of the URL
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language_url = request.get_full_path(force_append_slash=path_needs_slash).replace(
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script_prefix,
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'%s%s/' % (script_prefix, language),
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1
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)
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# Redirect to the language-specific URL as detected by
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# get_language_from_request(). HTTP caches may cache this
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# redirect, so add the Vary header.
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redirect = self.response_redirect_class(language_url)
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patch_vary_headers(redirect, ('Accept-Language', 'Cookie'))
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return redirect
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if not (i18n_patterns_used and language_from_path):
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patch_vary_headers(response, ('Accept-Language',))
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response.headers.setdefault('Content-Language', language)
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return response
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