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Isolate HTML popup openers (#2501)

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This commit is contained in:
Vykos
2026-06-04 20:52:41 +02:00
committed by GitHub
parent ca8ca38a32
commit 9964f1382f
3 changed files with 39 additions and 0 deletions
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1
static/js/codeRunner.js
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@@ -362,6 +362,7 @@ export function runHTML(code, panel) {
addCloseBtn(panel); addCloseBtn(panel);
return; return;
} }
try { win.opener = null; } catch (_) {}
win.document.open(); win.document.open();
win.document.write(code); win.document.write(code);
win.document.close(); win.document.close();

1
static/js/compare/index.js
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@@ -1090,6 +1090,7 @@ function _exportPrint() {
// the system print dialog — user can pick "Save as PDF" from there. // the system print dialog — user can pick "Save as PDF" from there.
const w = window.open('', '_blank'); const w = window.open('', '_blank');
if (!w) return; if (!w) return;
try { w.opener = null; } catch (_) {}
const escape = (s) => s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;'); const escape = (s) => s.replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
const html = '<!doctype html><meta charset="utf-8"><title>Compare export</title>' + const html = '<!doctype html><meta charset="utf-8"><title>Compare export</title>' +
'<style>body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;max-width:780px;margin:32px auto;padding:0 24px;line-height:1.55;color:#222}' + '<style>body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;max-width:780px;margin:32px auto;padding:0 24px;line-height:1.55;color:#222}' +

37
tests/test_popup_opener_isolation_js.py Normal file
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@@ -0,0 +1,37 @@
import re
from pathlib import Path
ROOT = Path(__file__).resolve().parents[1]
def _source(path):
return (ROOT / path).read_text(encoding="utf-8")
def test_html_code_runner_detaches_opener_before_document_write():
src = _source("static/js/codeRunner.js")
match = re.search(
r"export function runHTML\(code, panel\) \{(?P<body>.*?)showOutput\(panel, 'Opened in new window'",
src,
re.S,
)
assert match
body = match.group("body")
assert "win.opener = null" in body
assert body.index("win.opener = null") < body.index("win.document.write(code)")
def test_compare_print_popup_detaches_opener_before_document_write():
src = _source("static/js/compare/index.js")
match = re.search(
r"function _exportPrint\(\) \{(?P<body>.*?)w\.document\.close\(\);",
src,
re.S,
)
assert match
body = match.group("body")
assert "w.opener = null" in body
assert body.index("w.opener = null") < body.index("w.document.write(html)")