Add a deprecated_redirect interstitial view.

sumo.views.deprecated_redirect shows a message informing the user that the
URL has changed and they should update their bookmarks. It takes one required
argument, `url` which is passed directly to `reverse()`. Any additional kwargs
are also passed to `reverse()` as the `kwargs` argument.

apps/sumo/templates/sumo/deprecated.html

@@ -0,0 +1,19 @@
+{# vim: set ts=2 et sts=2 sw=2: #}
+{% extends "base.html" %}
+{% set title = _('Redirecting') %}
+{% set refresh = (dest, 10) %}
+
+{% block content %}
+<article id="error-page" class="main">
+  <h1>{{ _('A URL has changed!') }}</h1>
+
+  <p>
+    {% trans %}
+      It looks like you've bookmarked an old URL. The new URL for this page
+      is below. You should update your bookmarks. We will forward you to the
+      new URL in 10 seconds.
+    {% endtrans %}
+  </p>
+  <p><strong>{{ proto }}{{ host }}{{ dest }}</strong></p>
+</article>
+{% endblock %}

apps/sumo/tests/test_views.py

@@ -1,15 +1,19 @@
 from django.conf import settings
+from django.contrib.sites.models import Site
 from django.http import HttpResponseRedirect, HttpResponsePermanentRedirect
 
+import mock
 from nose.tools import eq_
+from pyquery import PyQuery as pq
 from test_utils import RequestFactory
 
+from sumo.middleware import LocaleURLMiddleware
 from sumo.tests import TestCase
 from sumo.urlresolvers import reverse
-from sumo.views import redirect_to
+from sumo.views import deprecated_redirect, redirect_to
 
 
-class RedirectToTestcase(TestCase):
+class RedirectTests(TestCase):
     rf = RequestFactory()
 
     def test_redirect_to(self):
@@ -28,6 +32,21 @@ def test_redirect_kwargs(self):
         eq_(reverse('users.confirm_email', args=['1234']),
             resp['location'])
 
+    @mock.patch.object(Site.objects, 'get_current')
+    def test_deprecated_redirect(self, get_current):
+        get_current.return_value.domain = 'su.mo.com'
+        req = self.rf.get('/en-US/')
+        # Since we're rendering a template we need this to run.
+        LocaleURLMiddleware().process_request(req)
+        resp = deprecated_redirect(req, url='home')
+        eq_(200, resp.status_code)
+        doc = pq(resp.content)
+        assert doc('meta[http-equiv=refresh]')
+        refresh = doc('meta[http-equiv=refresh]')
+        timeout, url = refresh.attr('content').split(';url=')
+        eq_('10', timeout)
+        eq_(reverse('home'), url)
+
 
 class RobotsTestCase(TestCase):
     # Use the hard-coded URL because it's well-known.

apps/sumo/views.py

@@ -4,6 +4,7 @@
 import StringIO
 
 from django.conf import settings
+from django.contrib.sites.models import Site
 from django.core.cache import parse_backend_uri
 from django.http import (HttpResponsePermanentRedirect, HttpResponseRedirect,
                          HttpResponse)
@@ -48,6 +49,17 @@ def redirect_to(request, url, permanent=True, **kwargs):
     return HttpResponseRedirect(dest)
 
 
+def deprecated_redirect(request, url, **kwargs):
+    """Redirect with an interstitial page telling folks to update their
+    bookmarks.
+    """
+    dest = reverse(url, kwargs=kwargs)
+    proto = 'https://' if request.is_secure() else 'http://'
+    host = Site.objects.get_current().domain
+    return jingo.render(request, 'sumo/deprecated.html',
+                        {'dest': dest, 'proto': proto, 'host': host})
+
+
 def robots(request):
     """Generate a robots.txt."""
     if not settings.ENGAGE_ROBOTS:

templates/base.html

@@ -38,6 +38,10 @@
   {% endfor %}
 {% endif %}
 
+{% if refresh %}
+  <meta http-equiv="refresh" content="{{ refresh[1] }};url={{ refresh[0] }}"/>
+{% endif %}
+
 {% if canonical_url %}
   <link rel="canonical" href="{{ canonical_url }}" />
 {% endif %}