Horizon not handles exception while trying to login using 'Keystone Google Federation With OpenID'

[Stanislav Kolenkin]

Checking 'Keystone Google Federation With OpenID' feature for future integration with the client's deployment here. Looks like an issue in Horizon in MOS 9.0:
If we set WEBSSO_ENABLED = True in config file /etc/openstack-dashboard/local_settings.py:
205 # Enables keystone web single-sign-on if set to True.
206 WEBSSO_ENABLED = True
207 WEBSSO_CHOICES = (
208 ("credentials", _("Keystone Credentials")),
209 ("oidc", _("Google Login")))
210 WEBSSO_INITIAL_CHOICE = "credentials"

Button connect is not active after you press back on your browser

Steps to reproduce:
1. Open Horizon and choose 'Authenticate using: Google Login' option
2. Left Click on 'Connect' button
3. [Issue] Browser navigates to other page showing raw JSON with Error from Google Accounts. Go 'Backfter that Buttom Connect isn't enabled

Expected: Error handled, login functionality active and can be re-used without page reload
Actual: Browser shows raw json, button connect is not active after you press 'Back' button in a browser

I have tested this in Firefox 47.0 and Safari 9.1.2

On the controller nodes have been installed the following horizon packages:
ii horizon-vendor-theme 1.0.0~mos8-2~u14.04+mos3 all SCSS theme package for horizon
ii python-django-horizon 2:9.0.1-2~u14.04+mos22 all Django module providing web interaction with OpenStack
ii openstack-dashboard 2:9.0.1-2~u14.04+mos22 all web application to control an OpenStack cloud
ii openstack-dashboard-apache 2:9.0.1-2~u14.04+mos22 all web application to control an OpenStack cloud - Apache support
ii python-murano-dashboard 1:2.0.0-4.1~u14.04+mos11 all cloud-ready application catalog - dashboard plugin

[Paul Karikh (pkarikh)]

Since we have workaround (reload page) and this issue exists with misconfigured WEBSSO (as we found out with Stanislav after hangouts call), I think this bug has medium importance.

[Timur Sufiev (tsufiev-x)]

Whatever the issue with disabled 'Connect' button was, it's gone in current 9.0/mitaka branch, tested on both Chrome 54 and Firefox 47.

[Ekaterina Shutova (eshutova)]

Verified on 9.2 snapshot #682
Problem is reproduced with scenario:
1. Open Horizon and choose 'Authenticate using: Google Login' option
2. Left Click on 'Connect' button
3. Browser navigates to other page showing raw JSON with Error from Google Accounts.
{"error": {"message": "The request you have made requires authentication.", "code": 401, "title": "Unauthorized"}}
After going 'Back'(<-) button 'Connect' isn't enabled.