from gingerdj.conf import settings
from gingerdj.conf.urls.i18n import is_language_prefix_patterns_used
from gingerdj.http import HttpResponseRedirect
from gingerdj.urls import get_script_prefix, is_valid_path
from gingerdj.utils import translation
from gingerdj.utils.cache import patch_vary_headers
from gingerdj.utils.deprecation import MiddlewareMixin
[docs]class LocaleMiddleware(MiddlewareMixin):
"""
Parse a request and decide 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).
"""
response_redirect_class = HttpResponseRedirect
def process_request(self, request):
urlconf = getattr(request, "urlconf", settings.ROOT_URLCONF)
(
i18n_patterns_used,
prefixed_default_language,
) = is_language_prefix_patterns_used(urlconf)
language = translation.get_language_from_request(
request, check_path=i18n_patterns_used
)
language_from_path = translation.get_language_from_path(request.path_info)
if (
not language_from_path
and i18n_patterns_used
and not prefixed_default_language
):
language = settings.LANGUAGE_CODE
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)
urlconf = getattr(request, "urlconf", settings.ROOT_URLCONF)
(
i18n_patterns_used,
prefixed_default_language,
) = is_language_prefix_patterns_used(urlconf)
if (
response.status_code == 404
and not language_from_path
and i18n_patterns_used
and prefixed_default_language
):
# Maybe the language code is missing in the URL? Try adding the
# language prefix and redirecting to that URL.
language_path = "/%s%s" % (language, request.path_info)
path_valid = is_valid_path(language_path, urlconf)
path_needs_slash = not path_valid and (
settings.APPEND_SLASH
and not language_path.endswith("/")
and is_valid_path("%s/" % language_path, urlconf)
)
if path_valid or path_needs_slash:
script_prefix = get_script_prefix()
# Insert language after the script prefix and before the
# rest of the URL
language_url = request.get_full_path(
force_append_slash=path_needs_slash
).replace(script_prefix, "%s%s/" % (script_prefix, language), 1)
# Redirect to the language-specific URL as detected by
# get_language_from_request(). HTTP caches may cache this
# redirect, so add the Vary header.
redirect = self.response_redirect_class(language_url)
patch_vary_headers(redirect, ("Accept-Language", "Cookie"))
return redirect
if not (i18n_patterns_used and language_from_path):
patch_vary_headers(response, ("Accept-Language",))
response.headers.setdefault("Content-Language", language)
return response