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venv/Lib/site-packages/django/middleware/locale.py

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+from django.conf import settings
+from django.conf.urls.i18n import is_language_prefix_patterns_used
+from django.http import HttpResponseRedirect
+from django.urls import get_script_prefix, is_valid_path
+from django.utils import translation
+from django.utils.cache import patch_vary_headers
+from django.utils.deprecation import MiddlewareMixin
+
+
+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