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Improve attribute removal in Html::clean() - #264
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The attribute strip matched from the start of a tag to the first ">", so a tag whose attribute value contained one was only partly processed, and everything from the matched attribute to the end of the tag was discarded along with it. Walk a tag's attributes as complete units instead, treating a quote as opening a value only where a value may legally begin, and remove just the attribute that is not safe to keep. The style strip is folded into the same pass, since it was a second copy of the same pattern.
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Priority: ➖ Normal Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔴 Critical · up to
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Docstring coverage is 55.56% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 9 functions across 2 files. | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: improving unsafe attribute removal in Html::clean(). Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request.
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Review comments at @src/Html/HtmlBuilder.php:
- Line 497: Update ATTRIBUTE_PATTERN and the attribute scan used by clean() so
malformed input such as an equals sign before an attribute name cannot leave
later attributes unexamined; reject the tag when the scan cannot consume its
attributes. Add the stated malformed img input as a regression test and verify
onerror is not preserved.
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src/Html/HtmlBuilder.phptests/Html/HtmlBuilderTest.php
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An equals sign could neither separate two attributes nor begin a name, so a tag carrying one where a name was expected ended the attribute scan early and left the attributes after it unexamined. Treat it as a separator, which makes the scan total: from anywhere in a tag it either consumes an attribute or reaches the end of the tag. Also trims the comments on the two patterns.
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Html::clean()removed event-handler,xmlnsandstyleattributes with a pattern that ran from the start of a tag to the first>. That is not correct when an attribute value contains a>of its own, and it also meant the match consumed everything from the offending attribute to the end of the tag, so unrelated attributes after it were discarded too.This walks a tag's attributes as complete units instead, treating a quote as opening a value only where a value may legally begin, and removes just the attribute that should not be kept while leaving its separator in place. The
stylestrip was a second copy of the same pattern, so it is folded into the same pass. Two inputs that the old pattern mangled now survive: a URL path beginning withon, and handler-like text inside a quoted value such asalt. On a 286 KB document the new pass is slightly faster than the two it replaces.Behaviour changes
<img onerror=x src=y>now cleans to<img src=y>rather than<img >.styleis now removed consistently wherever it appears in a tag, where previously it was only matched in some positions.styles="…"is no longer affected.on, e.g.href="https://example.com/one=1", is no longer truncated.Tests
tests/Html/HtmlBuilderTest.php:testCleanRemovesUnsafeAttributes— data-driven over the attribute shapes a tag can carry, asserting the named attribute is gone.testCleanPreservesSafeMarkup— asserts markup that should be untouched round-trips unchanged, including prose containingonboarding=trueand the URL case above.testCleanKeepsTheAttributesSurroundingARemovedOne— pins the first behaviour change.The existing
testCleanis unmodified and still passes. 21 of the 48 assertions in this file fail against the previous implementation and all 48 pass with this change.Summary by CodeRabbit
>while preserving existing protocol rewriting and unwanted-element removal.