add undo (resub) to landing page of forum unsub link

lms/djangoapps/notification_prefs/tests.py

@@ -12,10 +12,11 @@ from notification_prefs import NOTIFICATION_PREF_KEY
 from notification_prefs.views import ajax_enable, ajax_disable, ajax_status, unsubscribe
 from student.tests.factories import UserFactory
 from user_api.models import UserPreference
+from util.testing import UrlResetMixin
 
 
 @override_settings(SECRET_KEY="test secret key")
-class NotificationPrefViewTest(TestCase):
+class NotificationPrefViewTest(UrlResetMixin, TestCase):
     INITIALIZATION_VECTOR = "\x00" * 16
 
     @classmethod
@@ -23,7 +24,9 @@ class NotificationPrefViewTest(TestCase):
         # Make sure global state is set up appropriately
         Client().get("/")
 
+    @patch.dict("django.conf.settings.FEATURES", {"ENABLE_DISCUSSION_SERVICE": True})
     def setUp(self):
+        super(NotificationPrefViewTest, self).setUp()
         self.user = UserFactory.create(username="testuser")
         # Tokens are intentionally hard-coded instead of computed to help us
         # avoid breaking existing links.
@@ -230,3 +233,17 @@ class NotificationPrefViewTest(TestCase):
         response = unsubscribe(request, self.tokens[self.user])
         self.assertEqual(response.status_code, 200)
         self.assertNotPrefExists(self.user)
+
+    def test_resubscribe_success(self):
+        def test_user(user):
+            # start without a pref key
+            self.assertFalse(UserPreference.objects.filter(user=user, key=NOTIFICATION_PREF_KEY))
+            request = self.request_factory.get("dummy")
+            request.user = AnonymousUser()
+            response = unsubscribe(request, self.tokens[user], resubscribe=True)
+            self.assertEqual(response.status_code, 200)
+            # this new DB entry will have a new value, so can't use assertPrefValid.  Just check existence
+            self.assertTrue(UserPreference.objects.filter(user=user, key=NOTIFICATION_PREF_KEY))
+
+        for user in self.tokens.keys():
+            test_user(user)

lms/djangoapps/notification_prefs/views.py

@@ -153,12 +153,13 @@ def ajax_status(request):
 
 
 @require_GET
-def unsubscribe(request, token):
+def unsubscribe(request, token, resubscribe=False):  # pylint: disable=unused-argument
     """
-    A view that disables notifications for a user who may not be authenticated
+    A view that disables or re-enables notifications for a user who may not be authenticated
 
     This view is meant to be the target of an unsubscribe link. The request
     must be a GET, and the `token` parameter must decrypt to a valid username.
+    The resubscribe feature allows "undo" of accidentally clicking on unsubscribe
 
     A 405 will be returned if the request method is not GET. A 404 will be
     returned if the token parameter does not decrypt to a valid username. On
@@ -174,6 +175,13 @@ def unsubscribe(request, token):
     except User.DoesNotExist:
         raise Http404("username")
 
+    if not resubscribe:
         UserPreference.objects.filter(user=user, key=NOTIFICATION_PREF_KEY).delete()
-
-    return render_to_response("unsubscribe.html", {})
+        return render_to_response("unsubscribe.html", {'token': token})
+    else:
+        UserPreference.objects.get_or_create(user=user,
+                                             key=NOTIFICATION_PREF_KEY,
+                                             defaults={
+                                                 "value": UsernameCipher.encrypt(user.username)
+                                             })
+        return render_to_response("resubscribe.html", {'token': token})

lms/templates/resubscribe.html

+<%!
+from django.core.urlresolvers import reverse
+from django.utils.translation import ugettext as _
+from django.conf import settings
+%>
+<%inherit file="main.html" />
+
+<%namespace name='static' file='static_content.html'/>
+
+<section class="container unsubscribe">
+
+  <section class="message">
+    <h1>${_("Re-subscribe Successful!")}</h1>
+    <hr class="horizontal-divider">
+    
+    <p>
+      ${_("You have re-enabled forum notification emails from {platform_name}. "
+          "Click {dashboard_link_start}here{link_end} to return to your dashboard. ").format(
+             platform_name=settings.PLATFORM_NAME,
+             dashboard_link_start="<a href='{}'>".format(reverse('dashboard')),
+             link_end="</a>",)}
+    </p>
+  </section>
+</section>

lms/templates/unsubscribe.html

-<%! from django.core.urlresolvers import reverse %>
+<%!
+from django.core.urlresolvers import reverse
+from django.utils.translation import ugettext as _
+from django.conf import settings
+%>
 <%inherit file="main.html" />
 
 <%namespace name='static' file='static_content.html'/>
@@ -6,12 +10,17 @@
 <section class="container unsubscribe">
 
   <section class="message">
-    <h1>Unsubscribe Successful!</h1>
+    <h1>${_("Unsubscribe Successful!")}</h1>
     <hr class="horizontal-divider">
     
     <p>
-      You will no longer receive notification emails from edX.
-      Click <a href="${reverse('dashboard')}">here</a> to return to your dashboard.
+      ${_("You will no longer receive forum notification emails from {platform_name}. "
+          "Click {dashboard_link_start}here{link_end} to return to your dashboard. "
+          "If you did not mean to do this, click {undo_link_start}here{link_end} to re-subscribe.").format(
+             platform_name=settings.PLATFORM_NAME,
+             dashboard_link_start="<a href='{}'>".format(reverse('dashboard')),
+             undo_link_start="<a id='resub_link' href='{}'>".format(reverse('resubscribe_forum_update', args=[token])),
+             link_end="</a>",)}
     </p>
   </section>
 </section>

lms/urls.py

@@ -339,6 +339,8 @@ if settings.COURSEWARE_ENABLED:
             url(r'^notification_prefs/disable/', 'notification_prefs.views.ajax_disable'),
             url(r'^notification_prefs/status/', 'notification_prefs.views.ajax_status'),
             url(r'^notification_prefs/unsubscribe/(?P<token>[a-zA-Z0-9-_=]+)/', 'notification_prefs.views.unsubscribe'),
+            url(r'^notification_prefs/resubscribe/(?P<token>[a-zA-Z0-9-_=]+)/',
+                'notification_prefs.views.unsubscribe', {'resubscribe': True}, name="resubscribe_forum_update"),
         )
     urlpatterns += (
         # This MUST be the last view in the courseware--it's a catch-all for custom tabs.