django1/django/contrib/redirects/middleware.py

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from django.models.redirects import redirects
from django.utils import httpwrappers
from django.conf.settings import APPEND_SLASH, SITE_ID
class RedirectFallbackMiddleware:
def process_response(self, request, response):
if response.status_code != 404:
return response # No need to check for a redirect for non-404 responses.
path = request.get_full_path()
try:
r = redirects.get_object(site__id__exact=SITE_ID, old_path__exact=path)
except redirects.RedirectDoesNotExist:
r = None
if r is None and APPEND_SLASH:
# Try removing the trailing slash.
try:
r = redirects.get_object(site__id__exact=SITE_ID,
old_path__exact=path[:path.rfind('/')]+path[path.rfind('/')+1:])
except redirects.RedirectDoesNotExist:
pass
if r is not None:
if r == '':
return httpwrappers.HttpResponseGone()
return httpwrappers.HttpResponseRedirect(r.new_path)
# No redirect was found. Return the response.
return response