32 lines
1.2 KiB
HTML
32 lines
1.2 KiB
HTML
<!DOCTYPE html>
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<body>
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<script>
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// This document will contain an iframe which will either host echo-policy.py,
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// or will host another copy of this document, with the nesting level reduced
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// by one. This way, an arbitrary nesting depth can be achieved, with the
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// final inner-most frame reporting back the advertised required policy.
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// The 'id' URL parameter will be passed to the nested document.
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// The 'level' URL paramater will be reduced by 1 and passed to the nested
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// document if it was at least 1. (If it was 0, then echo-policy.py will be
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// nested instead, and the level parameter will not be passed.)
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// This document is served with a Document Policy header that should satisfy
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// any requests that include a required policy for the
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// 'lossless-images-max-bpp' feature.
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const params = new URLSearchParams(window.location.search);
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const id = params.get('id');
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const level = params.get('level');
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const iframe = document.createElement('iframe');
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var hostname;
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if (level >= 1) {
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params.set('level',level-1);
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hostname = document.location.pathname + "?" + params.toString();
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} else {
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params.delete('level');
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hostname = "/document-policy/echo-policy.py?" + params.toString();
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}
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iframe.src = hostname;
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document.body.appendChild(iframe);
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</script>
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