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Miguel Angel Simon Sierra
b2ef6192ed
Two rounds of regex/tokenizer patches to sanitizeSvg found new bypasses in the same shape each time (unquoted href, style= url(), aliased xlink prefix; then presentation-attribute url(), unquoted '=' handling, SMIL animate/set href rewrite, self-closing-slash tag corruption, data:image/ navigation via <a>). Denylisting attribute names against a hand-rolled tokenizer was the wrong approach regardless of how careful the regex. Rewrote sanitizeSvg (packages/core/src/figma/sanitizeSvg.ts) as a real DOM walk (linkedom, already a dependency of core and cli) with an allowlist: known-safe elements and attributes only, everything else dropped by construction rather than pattern-matched as dangerous. href/xlink:href (any namespace prefix) kept only for a same-document fragment, or data:image/ off non-<a> elements. Any attribute value or <style> text containing url() kept only when every url() argument is a fragment; @import/expression(/javascript: dropped from style content. Serializing from a real DOM means output is always well-formed, so the self-closing-slash corruption class of bug is gone by construction. media-use's own copy (packages/cli/src/media-use/lib/svg-sanitize.mjs) can't import linkedom directly: its CI test lane runs bare `node --test` with no install step, so even an external dependency fails to resolve, not just a workspace import. It's now a generated file instead of a hand-copy: scripts/generate-media-use-svg-sanitize.mjs bundles the core source (esbuild, minified, zero remaining imports) and scripts/check-media-use-svg-sanitize-generated.test.mjs fails the build on drift. Verified the generated file runs with plain node in an empty directory with no node_modules on the path. Every payload from both independent-review reports is now a table-driven test in sanitizeSvg.test.ts (46 cases) and the same corpus in check-svg-sanitize-parity.test.mjs (39 cases) asserts core and the generated media-use copy agree and each independently rejects every non-local url(), javascript:, data: href on <a>, and on* handler. Mutation-proved against the real pre-fix blob, not a synthetic case. Sampled 56 real theSVG icons across all 7 collections to check the allowlist doesn't over-strip legitimate content: found and fixed three missing attributes (fx/fy, enable-background, a blanket data-* allowance) and one real behavioral bug - <style> elements were being dropped outright, silently unstyling any Illustrator-exported logo that colors paths via CSS classes. Fixed by keeping <style> on the allowlist and content-checking its text the same way as an inline style= attribute, with a regression test using that exact shape. Full suite after the fix: sanitizeSvg.test.ts 46/46, parity+drift tests 39/39, media-use suite 298/298, tsc/oxlint/oxfmt clean.