app/views/auth/status.scala.html (12 lines of code) (raw):
@(userJson: String)
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script>(this.parent || this.opener).postMessage(@Html(userJson), '*');</script>
</head>
<body>
You are logged in.
</body>
</html>