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// Step 1. Send request with redirect queryString (eg. file_redirect.sjs?302)
// Step 2. Server responds with corresponding redirect code to http://example.com/../file_redirect.sjs?check
// Step 3. Response from ?check indicates whether the redirected request was secure or not.
const RESPONSE_ERROR = "unexpected-query";
// An onload postmessage to window opener
const RESPONSE_SECURE = `
<html>
<body>
send onload message...
<script type="application/javascript">
window.opener.postMessage({result: 'secure'}, '*');
</script>
</body>
</html>`;
const RESPONSE_INSECURE = `
<html>
<body>
send onload message...
<script type="application/javascript">
window.opener.postMessage({result: 'insecure'}, '*');
</script>
</body>
</html>`;
function handleRequest(request, response) {
response.setHeader("Cache-Control", "no-cache", false);
const query = request.queryString;
// Send redirect header
if ((query >= 301 && query <= 303) || query == 307) {
// our upgrade downgrade endless loop break mechanism kicks in
const loc =
response.setStatusLine(request.httpVersion, query, "Found");
response.setHeader("Location", loc, false);
return;
}
// Check if scheme is http:// or https://
if (query == "check") {
const secure =
request.scheme == "https" ? RESPONSE_SECURE : RESPONSE_INSECURE;
response.setStatusLine(request.httpVersion, 200, "OK");
response.write(secure);
return;
}
// This should not happen
response.setStatusLine(request.httpVersion, 500, "OK");
response.write(RESPONSE_ERROR);
}