fix(edge): nested lists and attribute > leaks in markdown negotiation - #732
fix(edge): nested lists and attribute > leaks in markdown negotiation#732Anshumancanrock wants to merge 2 commits into
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Signed-off-by: anshumancanrock <anshu.1239.as@gmail.com>
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📝 WalkthroughWalkthroughThe Markdown negotiation converter now protects ChangesMarkdown negotiation parsing
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: 🔵 Low · up to Markdown conversion still mishandles valid ordered lists declared with start="0", causing those lists to display with the wrong numbering. The impact is localized and the PR is otherwise mergeable with explicit owner awareness or a follow-up fix and regression test. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 1
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Verify each finding against current code. Fix only still-valid issues, skip the
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Inline comments:
In `@netlify/edge-functions/markdown-negotiation.js`:
- Line 321: Update the HTML processing flow around the `<main>` extraction to
protect html before scanning the title, description, and main tags, preventing
`>` inside attributes from ending the match early. Keep protected characters
encoded throughout intermediate scans and restore them only in the final
Markdown result, then add a regression test covering a `<main>` attribute
containing `>`.
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mesutoezdil
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solid fix, good tests. ci build is green even though the checklist box is empty.
| // tag scans don't stop early. | ||
| const ATTR_GT = "\u0001"; | ||
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| function findTagClose(html, openIndex) { |
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a stray unescaped < in text opens a fake tag here and can mask real tags up to the next >. docusaurus should always emit <, so likely fine, just confirming you considered it.
| } | ||
| return items | ||
| .map((item, index) => { | ||
| const marker = ordered ? `${index + 1}. ` : `- `; |
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ol start="3" is ignored, numbering restarts at 1. rare in docs but easy to read from the open tag.
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done, we read start off the open tag now and number from there. covered with a test.
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| // Same idea as the block-store marker: hide `>` inside quoted attrs so `[^>]*` | ||
| // tag scans don't stop early. | ||
| const ATTR_GT = "\u0001"; |
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if the page body ever contains a literal \u0001 it gets turned into >. a longer private marker would be safer.
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fair point. switched to a longer private-use marker (\uE000ATTRGT\uE000).
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| }); | ||
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| it("keeps nested ordered lists nested", async () => { |
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no test for a three level list. the recursion should handle it, one case would lock it in.
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added one. also fixed a small indent bug trimStart was wiping on continuation lines past two levels.
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Inline comments:
In `@netlify/edge-functions/markdown-negotiation.js`:
- Line 266: Update the ordered-list start-value handling to preserve a finite
start of zero instead of replacing it with 1, while retaining the fallback for
invalid or absent values. Add a regression test covering <ol start="0"> and
verify the rendered numbering starts at zero.
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hii @mesutoezdil , please take a look now. Thanks! |
Signed-off-by: anshumancanrock <anshu.1239.as@gmail.com>
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| const rawDescription = | ||
| html.match(/<meta[^>]+name=["']description["'][^>]+content=["']([^"']*)["'][^>]*>/i)?.[1] ?? ""; | ||
| html = protectQuotedAngles(html); | ||
| const rawTitle = restoreQuotedAngles(html.match(/<title[^>]*>([\s\S]*?)<\/title>/i)?.[1] ?? ""); |
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the new tests cover the body but not this path. is there a case for a title or meta description whose attribute contains a >?
| return -1; | ||
| } | ||
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| function protectQuotedAngles(html) { |
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this walks every character of the page html on each request, inside an edge function. did you measure the added time on a large docs page?
| while ((match = open.exec(html))) { | ||
| result += html.slice(cursor, match.index); | ||
| const ordered = match[1].toLowerCase() === "ol"; | ||
| const startAttr = ordered ? match[0].match(/\bstart\s*=\s*["']?(-?\d+)/i)?.[1] : null; |
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the -? accepts a negative start, and <ol start="-2"> then emits -2. a, which markdown renders as text rather than a list. i doubt docusaurus ever emits it, but is the sign wanted here?
| const rawDescription = | ||
| html.match(/<meta[^>]+name=["']description["'][^>]+content=["']([^"']*)["'][^>]*>/i)?.[1] ?? ""; | ||
| html = protectQuotedAngles(html); | ||
| const rawTitle = restoreQuotedAngles(html.match(/<title[^>]*>([\s\S]*?)<\/title>/i)?.[1] ?? ""); |
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answering my own two earlier questions: i ran the branch. a > inside a title or description attribute comes out right, and 378 KB of html takes about 7 ms, so neither is a problem. the 79 tests pass.
2 participants
What type of PR is this?
/kind bug
What this PR does / why we need it:
Fixes the two follow-ups from #688.
Nested lists were getting flattened because
<li>.*?</li>closed at the first nested</li>, so sub-items got promoted and parent steps renumbered. Walkul/ol/liby depth instead, and unwrap<p>before list conversion so Docusaurus-style items don't come out as1.\n\ntext.Quoted
>in attributes was leaking into the body (title="a > b"→b">…) because tag scans use[^>]*. Mask those before the scans, restore after.Also keep leading indent when collapsing spaces, otherwise nested list markers get wiped.
Which issue(s) this PR fixes:
Fixes #731
Checklist:
npm run lintandnpm run format:checkpassnpm run buildsucceeds for bothenandzhgit commit -s)Summary by CodeRabbit
Bug Fixes
>characters inside quoted HTML attributes from disrupting conversion.<characters in text unchanged.Tests