Websso link is contructed wrong in openstack_auth

[Andrey Grebennikov]

Federation is set up in Keystone
Openstack_auth is responsible for constructing the URL in order to properly redirect user's browser to Horizon after successful authentication with IdP.
By default it uses "/auth/websso/" as the origin, while MOS requires it to be "/horizon/auth/websso/".
It happens because Horizon operates within webroot "/horizon/" and all the links should contain this prefix.

[Andrey Grebennikov (agrebennikov)]

Here is the review:

https://review.openstack.org/#/c/288801/

[Timur Sufiev (tsufiev-x)]

Upstream bug: https://bugs.launchpad.net/horizon/+bug/1554024

[Robert Duncan (rduncan-t)]

I patched this is 8.0 with this:
https://review.openstack.org/#/c/173669/

works for me!

[Andrey Grebennikov (agrebennikov)]

MOS8.0 already should work properly, because it uses this:
url = utils.get_websso_url(request, auth_url, auth_type)

where utils.get_websso_url already uses WEBROOT var.