From 7b45b7ae4b175afdfdb512ed87f425cc4f402f51 Mon Sep 17 00:00:00 2001
From: Ruslan Aliev <raliev@mirantis.com>
Date: Sun, 3 Dec 2017 12:27:40 +0400
Subject: [PATCH] Fix back button on Firefox and Safari

Firefox (and Safari) uses bfcache (back-forward cache)
to load re-visited pages. The solution is to force a reload
when page is loaded from bfcache, so back button will work
correctly.
More information can be found here [1] and here [2].

[1] https://madhatted.com/2013/6/16/you-do-not-understand-browser-history
[2] https://stackoverflow.com/questions/8788802/prevent-safari-loading-from-cache-when-back-button-is-clicked

Change-Id: If023bca7c73f983e55c383856e304379c7b8be3a
Closes-bug: #1686315
---
 horizon/static/horizon/js/horizon.hacks.js    | 24 +++++++++++++++++++
 .../templates/horizon/_scripts.html           |  1 +
 2 files changed, 25 insertions(+)
 create mode 100644 horizon/static/horizon/js/horizon.hacks.js

diff --git a/horizon/static/horizon/js/horizon.hacks.js b/horizon/static/horizon/js/horizon.hacks.js
new file mode 100644
index 0000000000..d1db9fa93a
--- /dev/null
+++ b/horizon/static/horizon/js/horizon.hacks.js
@@ -0,0 +1,24 @@
+/**
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+// Added so that we can break Firefox and Safari bfcache to
+// prevent loading previous page from cache.
+horizon.addInitFunction(function () {
+  $(window).bind('pageshow', function(event) {
+    if (event.originalEvent.persisted) {
+      window.location.reload();
+    }
+  });
+});
+
diff --git a/openstack_dashboard/templates/horizon/_scripts.html b/openstack_dashboard/templates/horizon/_scripts.html
index 78b0430ce4..49d75d8c94 100644
--- a/openstack_dashboard/templates/horizon/_scripts.html
+++ b/openstack_dashboard/templates/horizon/_scripts.html
@@ -27,6 +27,7 @@
 <script src='{{ STATIC_URL }}horizon/js/horizon.loader.js'></script>
 <script src='{{ STATIC_URL }}horizon/js/horizon.messages.js'></script>
 <script src='{{ STATIC_URL }}horizon/js/horizon.modals.js'></script>
+<script src='{{ STATIC_URL }}horizon/js/horizon.hacks.js'></script>
 <script type="text/javascript">
   horizon.modals.MODAL_BACKDROP = "{% firstof HORIZON_CONFIG.modal_backdrop 'static' %}";
 </script>