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// A 1x1 PNG image.
// Source: https://commons.wikimedia.org/wiki/File:1x1.png (Public Domain)
const IMAGE = atob(
"iVBORw0KGgoAAAANSUhEUgAAAAEAAAABAQMAAAAl21bKAAAAA1BMVEUAA" +
"ACnej3aAAAAAXRSTlMAQObYZgAAAApJREFUCNdjYAAAAAIAAeIhvDMAAAAASUVORK5CYII="
);
const IFRAME =
"<!DOCTYPE html>\n" +
"<script>\n" +
"onmessage = event => {\n" +
"parent.postMessage(document.referrer, '*');\n" +
"};\n" +
"</script>";
function handleRequest(aRequest, aResponse) {
aResponse.setStatusLine(aRequest.httpVersion, 200);
let key;
if (aRequest.queryString.includes("what=script")) {
key = "script";
} else if (aRequest.queryString.includes("what=image")) {
key = "image";
} else {
key = "iframe";
}
if (aRequest.queryString.includes("result")) {
aResponse.write(getState(key));
setState(key, "");
return;
}
if (aRequest.hasHeader("Referer")) {
let referrer = aRequest.getHeader("Referer");
setState(key, referrer);
}
if (key == "script") {
aResponse.setHeader("Content-Type", "text/javascript", false);
aResponse.write("42;");
} else if (key == "image") {
aResponse.setHeader("Content-Type", "image/png", false);
aResponse.write(IMAGE);
} else {
aResponse.setHeader("Content-Type", "text/html", false);
aResponse.write(IFRAME);
}
}
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