keycloak-scim/adapters/oidc/js/src/main/resources/login-status-iframe.html

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  ~ Copyright 2016 Red Hat, Inc. and/or its affiliates
  ~ and other contributors as indicated by the @author tags.
  ~
  ~ Licensed under the Apache License, Version 2.0 (the "License");
  ~ you may not use this file except in compliance with the License.
  ~ You may obtain a copy of the License at
  ~
  ~ http://www.apache.org/licenses/LICENSE-2.0
  ~
  ~ Unless required by applicable law or agreed to in writing, software
  ~ distributed under the License is distributed on an "AS IS" BASIS,
  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<script>
    function getCookie(cname)
    {
        var name = cname + "=";
        var ca = document.cookie.split(';');
        for(var i=0; i<ca.length; i++)
        {
            var c = ca[i].trim();
            if (c.indexOf(name)==0) return c.substring(name.length,c.length);
        }
        return null;
    }
    function receiveMessage(event)
    {
        if (event.origin !== "ORIGIN") {
            console.log(event.origin + " does not match built origin");
            return;

        }
        var data = JSON.parse(event.data);
        var cookie = getCookie('KEYCLOAK_SESSION');
        var state;
        if (!data.sessionId || data.sessionId == cookie) {
            state = "unchanged";
        } else {
            state = "changed";
        }

        event.source.postMessage(state,
                event.origin);
    }
    window.addEventListener("message", receiveMessage, false);
</script>