Squash Odysseus development history

tests/test_markdown_dom_xss_helpers.py

@@ -0,0 +1,38 @@
+"""Regression guards for markdown raw-HTML sanitizer helpers."""
+
+from pathlib import Path
+
+
+_REPO = Path(__file__).resolve().parent.parent
+
+
+def test_markdown_raw_html_sanitizer_checks_url_attr_edge_cases():
+    src = (_REPO / "static" / "js" / "markdown.js").read_text(encoding="utf-8")
+
+    assert "function _compactUrlSchemeValue(value)" in src
+    assert "function _isDangerousUrl(value)" in src
+    assert "function _isDangerousSrcset(value)" in src
+    assert "'srcset'" in src
+    assert "candidate => _isDangerousUrl(candidate)" in src
+    assert "name === 'srcset' ? _isDangerousSrcset(attr.value) : _isDangerousUrl(attr.value)" in src
+
+
+def test_markdown_raw_html_sanitizer_strips_scriptable_css():
+    src = (_REPO / "static" / "js" / "markdown.js").read_text(encoding="utf-8")
+
+    assert "if (name === 'style')" in src
+    assert r"javascript:|vbscript:|data:|expression\(" in src
+    assert "el.removeAttribute(attr.name);" in src
+
+
+def test_email_rich_body_render_path_reuses_raw_html_sanitizer():
+    markdown_src = (_REPO / "static" / "js" / "markdown.js").read_text(encoding="utf-8")
+    document_src = (_REPO / "static" / "js" / "document.js").read_text(encoding="utf-8")
+    email_body_helper = document_src.split("function _emailBodyToHtml(text)", 1)[1].split(
+        "  // Mirror the rich body's plain text", 1
+    )[0]
+
+    assert "export function sanitizeAllowedHtml(html)" in markdown_src
+    assert "sanitizeAllowedHtml," in markdown_src
+    assert "markdownModule.sanitizeAllowedHtml(t)" in email_body_helper
+    assert "return t;" not in email_body_helper