def openstack(request):
    """Context processor necessary for OpenStack Dashboard functionality.

    The following variables are added to the request context:

    ``authorized_tenants``
        A list of tenant objects which the current user has access to.

    ``regions``

        A dictionary containing information about region support, the current
        region, and available regions.
    """
    context = {}

    # Auth/Keystone context
    context.setdefault('authorized_tenants', [])
    if request.user.is_authenticated():
        context['authorized_tenants'] = [
            tenant for tenant in
            request.user.authorized_tenants if tenant.enabled]

    # Region context/support
    available_regions = getattr(settings, 'AVAILABLE_REGIONS', [])
    regions = {'support': len(available_regions) > 1,
               'current': {'endpoint': request.session.get('region_endpoint'),
                           'name': request.session.get('region_name')},
               'available': [{'endpoint': region[0], 'name':region[1]} for
                             region in available_regions]}
    context['regions'] = regions

    return context
dataset/ETHPy150Open CiscoSystems/avos/openstack_dashboard/context_processors.py/openstack/original