The newest keycloak library supporst a mode for doing the redirect in an iframe
with a separate page that needs to be whitelisted in keycloak.

The newer version also finally fixes the native promise bugs so we might as well
use the one from npm instead of fetching it from the keycloak server at runtime.

No final design, just a start.

Neuber, Eugen Ramon authored 5 years ago and Reiter, Christoph committed 4 years ago

TODO: rollup.config.js cleanup

We keep the login state in the session storage and force a login in case the user was
logged in before.

This means a page refresh will try to restore the login state (which usually should mean
that it just flashes becasue of redirects). And new visitors get the logged out state by default.

The main entry point is now src/index.js when included in other packages.