Make: drop o2's control classes from comment HTML - #879
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Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T1kfkymZDgMdeVRpDUUQL7
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe comment filter now calls the global ChangesComment filtering
Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Severity of issue fixed: Medium Merge Risk: ⚪ Minimal · up to Comment HTML filtering now safely obtains and adjusts the post allowlist, preventing the PHP type error while preserving the intended filtering behavior. The change is ready to merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In
`@wordpress.org/public_html/wp-content/mu-plugins/pub/wporg-allow-more-html-in-comments.php`:
- Line 75: Update strip_o2_control_classes() to remove the stripos($html, 'o2-')
early-return fast path, ensuring encoded o2- control classes are still
discovered through WP_HTML_Tag_Processor::class_list() after decoding.
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A comment is prose, so drop <textarea> and <button> from the tag list its content is filtered against, following the <title> removal already in this file. o2 reads meaning into both elements, and neither has a use in a comment. Also drop the short-circuit at the top of the class strip. It saved nothing measurable and made the function depend on kses having already decoded the class attribute. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G7igwqfoFf4H6DHLA2QquM
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Inline comments:
In
`@wordpress.org/public_html/wp-content/mu-plugins/pub/wporg-allow-more-html-in-comments.php`:
- Line 74: Update the allowlist initialization in the comment-filtering function
to call the global WordPress wp_kses_allowed_html function explicitly, avoiding
the namespaced callback and ensuring $tags receives the post allowlist array
before unset operations.
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The file declares its own wp_kses_allowed_html() as a filter callback, so inside the namespace the unqualified call bound to that instead of the core function and came back with the string it was passed. Qualify it. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G7igwqfoFf4H6DHLA2QquM
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P2 and o2 comments go through the post HTML filters rather than the comment ones, so a comment can carry structural markup and arbitrary classes. o2 binds its post actions, and the lookup that picks which editor to read, to class names across the whole post article, and comments sit inside that article.
Comment HTML is author-supplied, so it should not be able to present itself as one of o2's own controls.
pre_comment_contentnow runs the post filters and then drops anyo2--prefixed class.Comments are also filtered against a slightly narrower tag list than posts:
<textarea>and<button>come out, following the<title>removal already in this file. A comment is prose, so a field the reader can type into or a button they can press has no use in one, and o2 reads meaning into both.<input>,<select>and<form>were never in the post list to begin with, so this is two tags rather than the whole form family.The plugin already dropped
<title>from the allowlist for a similar reason. Classes added by o2 at render time, such as the xpost highlight, are unaffected: this only touches what gets stored.The short-circuit at the top of the class strip is gone. It saved nothing measurable, and it left the function's correctness resting on kses having already decoded the class attribute.
There is no test suite for
mu-plugins/pub, so this ships without one. Behaviour was checked by hand against WP 7.0.2: the two tags are dropped,o2-classes are removed whether written literally or as numeric character references, and ordinary comment markup (paragraph classes, code blocks, lists, images) is untouched.🤖 Generated with Claude Code
https://claude.ai/code/session_01T1kfkymZDgMdeVRpDUUQL7
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