React-router (0.13) + Flux - how to get an instance of the flux class in willTransitionTo?

I have a container component for all routes that need authorized access. But I need a universal lifecycle hook to ask the Flux store "is the user registered?" The problem is that it static willTransitionHook

doesn't have access to props (or context):

class AuthenticatedHandler extends React.Component {
    static willTransitionTo(transition) {
        // `this.props.flux` is not accessible
    }

    componentDidMount() {
        console.log('did mount', this.props);
    }

    render() {
        const { flux } = this.props;

        return (
            <FluxComponent flux={flux} connectToStores={{
                user: store => ({
                    isLoggedIn: store.isLoggedIn(),
                    user: store.getUser()
                })
            }}>
                <RouteHandler />
            </FluxComponent>
        );
    }
}

      

        
        
        
      

    

What solution do you suggest? Use componentDidMount

+ componentDidUpdate

? Thank!