Mithril example with control access for specific route - from Barney Carroll

mexample.js

m.route( document.body, "/dashboard/johndoe", {
    "/dashboard/:userID": {
        controller : function(){
            return m.request( {
                url         : "/permissions/" + m.route.param( "userID" ),
                deserialize : function( xml ){
                    return new DOMParser().parseFromString( xml, "text/xml" );
                }
            } ).then(
                function success(){},
                function failure(){
                    m.route( "/forbidden" )
                }
            )
        },
        view : function( request ){
            return m( ".root",
                m( "h1", "Welcome, ", m.route.param( "userID" ) )
                request()
        }
} );