migration-iframe.html

<!DOCTYPE html>
<html lang='en'>
	<head>
		<meta charset='utf-8'>
		<title>Migration IFrame</title>
	</head>
	<body>
		<p>This is a hidden page for migrating old Sprig games to the new Sprig account system. You probably won't find anything here :)</p>

		<script>
			const referrer = new URL(document.referrer)
			const allowed = [ 'localhost', '127.0.0.1' ].includes(referrer.hostname)
				|| referrer.hostname.endsWith('.hackclub.dev')
				|| referrer.hostname.endsWith('.hackclub.com')
			if (!allowed) throw new Error('Disallowed referrer')
				
			window.parent.postMessage({
				sprig: true,
				puzzleLab: window.localStorage.getItem('puzzle-lab') || ''
			}, '*')
		</script>
	</body>
</html>