Distributed Cloud fix for switching between RegionOne and SystemController

Adds custom home lookup function and JS to automatically redirect
when authorization errors are hit to make the transition more seamless

Change-Id: I9dfda59ce216db4d562094b309ac7809c7a80735
Partial-Bug: 1846239
Signed-off-by: Tyler Smith <tyler.smith@windriver.com>

starlingx-dashboard/starlingx-dashboard/starlingx_dashboard/local/local_settings.d/_30_stx_local_settings.py

@@ -68,6 +68,9 @@ if distributed_cloud_role and distributed_cloud_role in ['systemcontroller',
                                                          'subcloud']:
     DC_MODE = True
 
+HORIZON_CONFIG["user_home"] = \
+    "starlingx_dashboard.utils.settings.get_user_home"
+
 OPENSTACK_ENDPOINT_TYPE = "internalURL"
 
 # Override Django tempory file upload directory

starlingx-dashboard/starlingx-dashboard/starlingx_dashboard/static/js/horizon.auto_redirect.js

@@ -0,0 +1,16 @@
+/**
+ *  Copyright (c) 2019 Wind River Systems, Inc.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ *
+ */
+
+horizon.addInitFunction(function () {
+  // This is a workaround to automatically redirect to the login page when an authorization error page is displayed.
+  // It occurs every time a user switches between RegionOne and SystemController in a distributed cloud setup
+  // since the same dashboards are not accessible to both regions.
+  // The login page will see the user is already logged in and redirect to the user's home page.
+  if ($("#content_body:contains('You are not authorized to access this page')").length > 0){
+    window.location.replace("/auth/login/")
+  }
+});

starlingx-dashboard/starlingx-dashboard/starlingx_dashboard/utils/settings.py

@@ -0,0 +1,35 @@
+#
+#  Copyright (c) 2019 Wind River Systems, Inc.
+#
+#  SPDX-License-Identifier: Apache-2.0
+#
+
+from django.conf import settings
+
+import horizon
+from horizon import base
+
+
+def get_user_home(user):
+    dashboard = horizon.get_default_dashboard()
+    dc_mode = getattr(settings, 'DC_MODE', False)
+
+    if user.is_superuser:
+        if getattr(user, 'services_region', None) == 'SystemController':
+            try:
+                dashboard = horizon.get_dashboard('dc_admin')
+            except base.NotRegistered:
+                pass
+
+    if getattr(user, 'services_region', None) == 'RegionOne' and dc_mode:
+        try:
+            if user.is_superuser:
+                dashboard = horizon.get_dashboard('admin'). \
+                    get_panel("inventory")
+            else:
+                dashboard = horizon.get_dashboard('project'). \
+                    get_panel("api_access")
+        except base.NotRegistered:
+            pass
+
+    return dashboard.get_absolute_url()