window.addEventListener('message', (event) => {
    if (event.source !== window)
        return;

    if (event.data.command && (event.data.command === 'authResult')) {
        chrome.runtime.sendMessage({
            command: event.data.command,
            code: event.data.code,
            state: event.data.state,
            referrer: event.source.location.hostname,
        });
    }
}, false);