echo-allow-csp-from.py

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import json

def main(request, response):

    headers = [(b"Content-Type", b"text/html")]

    if b"allow_csp_from" in request.GET:

        headers.append((b"Allow-CSP-From", request.GET[b"allow_csp_from"]))

    message = request.GET[b"id"]

    return headers, b'''

<!DOCTYPE html>

<html>

<head>

    <title>This page enforces embedder's policies</title>

    <script nonce="123">

        document.addEventListener("securitypolicyviolation", function(e) {

            var response = {};

            response["id"] = "%s";

            response["securitypolicyviolation"] = true;

            response["blockedURI"] = e.blockedURI;

            response["lineNumber"] = e.lineNumber;

            window.top.postMessage(response, '*');

});

    </script>

</head>

<body>

    <script nonce="123">

        let img = document.createElement('img');

        img.src = "../../support/pass.png";

        img.onload = function() { window.top.postMessage("img loaded", '*'); }

        document.body.appendChild(img);

    </script>

    <style>

        body {

            background-color: maroon;

    </style>

    <script nonce="abc">

        var response = {};

        response["id"] = "%s";

        response["loaded"] = true;

        window.top.postMessage(response, '*');

    </script>

</body>

</html>

''' % (message, message)