[keycloak-user] How to restore session for UI to REST API

[Marek Posolda]

On 21/06/16 00:13, Chris Pitman wrote:
> Hey everyone,
>
> I'm running into an issue with an application that I've ported over to using Keycloak. I believe that the token issued by keycloak is expiring, which causes XMLHttpRequest's from my front end to be redirected to KeyCloak which then tries to redirect to Google (my identity provider). By the time it gets to google, there have been redirects across two different domains causing the browser to not set an origin header in the request to google, which then causes the browser to not process the response.
Since keycloak automatically redirects to Google, it seems that you have 
"Authenticate by default" switch enabled for your google identity 
provider, right? Just replied to some other thread where user mentions 
some issue. We may have a bug in keycloak regarding this : 
http://lists.jboss.org/pipermail/keycloak-user/2016-June/006652.html

>
> What is the general way of handling a javascript ajax request when a token expires? Or to have a UI get a new token without requiring the entire ui to refresh to force the browser to redirect?
>
> For further background, here is my setup: I am using Google OpenID Connect as the identity provider. The application is protected with keycloak-proxy, which then passes requests on to the application. keycloak-proxy is the piece detecting the token is no longer valid and redirecting the ui to keycloak.
Hmm... for javascript apps, it's usually best to use keycloak.js 
adapter. Not sure why you need keycloak-proxy?

In keycloak.js you can automatically refresh tokens . Right before you 
send request to REST endpoint, you can call "keycloak.updateToken" which 
automatically refreshes token if it's expired or is going to expire in 5 
seconds or so (exact time is configurable based on argument to 
"updateToken" method. See docs or our examples - for example this 
https://github.com/keycloak/keycloak/blob/master/examples/demo-template/customer-app-js/src/main/webapp/customers/view.html#L93 
) .

Also in keycloak.js you can define callback "onTokenExpired" which is 
called when accessToken expires. Here you can implement sending refresh 
request as well.

In shortcut, you don't need to go through login flows and browser 
redirections to keycloak etc, but instead rely on refreshing tokens.

Marek
>
> Chris Pitman
> Architect, Red Hat Consulting
>
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