51 lines
1.9 KiB
Python
51 lines
1.9 KiB
Python
from django.apps import apps
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from django.conf import settings
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from django.contrib.redirects.models import Redirect
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from django.contrib.sites.shortcuts import get_current_site
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from django.core.exceptions import ImproperlyConfigured
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from django.http import HttpResponseGone, HttpResponsePermanentRedirect
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from django.utils.deprecation import MiddlewareMixin
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class RedirectFallbackMiddleware(MiddlewareMixin):
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# Defined as class-level attributes to be subclassing-friendly.
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response_gone_class = HttpResponseGone
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response_redirect_class = HttpResponsePermanentRedirect
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def __init__(self, get_response):
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if not apps.is_installed("django.contrib.sites"):
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raise ImproperlyConfigured(
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"You cannot use RedirectFallbackMiddleware when "
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"django.contrib.sites is not installed."
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)
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super().__init__(get_response)
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def process_response(self, request, response):
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# No need to check for a redirect for non-404 responses.
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if response.status_code != 404:
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return response
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full_path = request.get_full_path()
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current_site = get_current_site(request)
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r = None
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try:
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r = Redirect.objects.get(site=current_site, old_path=full_path)
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except Redirect.DoesNotExist:
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pass
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if r is None and settings.APPEND_SLASH and not request.path.endswith("/"):
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try:
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r = Redirect.objects.get(
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site=current_site,
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old_path=request.get_full_path(force_append_slash=True),
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)
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except Redirect.DoesNotExist:
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pass
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if r is not None:
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if r.new_path == "":
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return self.response_gone_class()
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return self.response_redirect_class(r.new_path)
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# No redirect was found. Return the response.
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return response
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