fix: collect all subset namespace prefixes when filtering ancestor namespaces - #541
fix: collect all subset namespace prefixes when filtering ancestor namespaces#541msheby wants to merge 8 commits into
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…mespaces findNSPrefix returned only the first xmlns:* attribute on a subset element, so findAncestorNs filtered only that one prefix when deciding which ancestor namespace declarations to hoist. When a subset element in the default namespace also declared a prefixed namespace (e.g. <AuthenticatedPrivate xmlns:enc="…">), findNSPrefix returned "enc" and left the inherited default namespace in the ancestor list. The C14N serializer then rendered the default namespace twice — once from the element itself and once from the hoisted ancestor entry — producing a digest that no other implementation would ever match. Replace findNSPrefix with findSubsetNSPrefixes, which collects every xmlns:* attribute on the subset element into a Set and always includes the element's own namespace prefix (empty string for the default namespace). findAncestorNs now uses Set.has() to filter, so all already-declared prefixes are suppressed regardless of how many xmlns:* attributes appear on the subset. The change is backward-compatible: it filters more ancestor entries than before, so no previously-hoisted namespace starts being suppressed. The concrete trigger is SMPTE ST 430-3 ETMs, where the XML signature covers <AuthenticatedPrivate xmlns:enc="http://www.w3.org/2001/04/xmlenc#"> as a subset reference. Fixes node-saml#538
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Included review availability: Your plan provides up to 2 included reviews per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change updates non-exclusive C14N namespace filtering and default-namespace rendering. It filters all subset declarations, corrects namespace state during rendering, and adds regression coverage for canonicalization variants. ChangesNon-exclusive C14N namespace filtering
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to This change corrects namespace canonicalization so required local default declarations are retained without duplicating inherited declarations. The identified digest-mismatch regression is covered and no current merge-blocking risk remains. Suggested reviewers: 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
Full details: Linked Issues checkExplanation The changes implement the requested multi-prefix filtering for issue [ Resolution Fix default-namespace rendering for prefixed elements with a locally declared xmlns attribute. Ensure the local declaration is retained after ancestor filtering, then make the full test suite pass, including the two failing tests for [ ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@src/utils.ts`:
- Around line 242-245: Restrict the namespace detection in the loop over
subsetAttributes to XML namespace declaration names only: match the default
xmlns attribute or names beginning with xmlns: followed by a prefix, not
ordinary names such as xmlnsfoo. Update the condition and preserve the existing
prefix extraction and subsetNsPrefixes behavior for valid declarations.
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src/utils.tstest/c14n-non-exclusive-unit-tests.spec.ts
…Prefixes
The /^xmlns:?/ regex also matched ordinary attributes whose names start
with "xmlns" but have no colon (e.g. xmlnsfoo). Such attributes are not
namespace declarations, but the old code added "foo" to the suppression
set, causing findAncestorNs to incorrectly drop an inherited xmlns:foo
declaration that must be hoisted to the subset root.
Replace the regex test with an exact equality check:
nodeName === "xmlns" || nodeName.startsWith("xmlns:")
Adds a regression test to cover the xmlnsfoo case.
test: add comprehensive namespace canonicalization tests
```
Expands unit test coverage for namespace handling in both C14n (inclusive)
and Exclusive C14n algorithms.
These new tests address various edge cases and complex interactions to
ensure correct namespace propagation, suppression, and declaration
rendering according to W3C specifications. Specific scenarios covered
include:
* Preventing duplicate default namespace declarations for subset roots
(regression for node-saml#538).
* Correctly handling inherited, locally declared, and cleared default
namespaces.
* Validating inclusive C14N's behavior with unused ancestor prefixes.
* Verifying Exclusive C14N's `PrefixList` logic for retaining specified
inclusive namespaces.
Existing namespace-related tests are also refactored to run against
`WithComments` variants, and their descriptions are enhanced with W3C
specification references.
```
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Overall, this looks good @msheby. I’ve added tests focused on #538 and the namespace filtering changed by this PR. Each includes a short explanation and a link to the relevant W3C specification. The tests confirm that your fix resolves the reported duplicate-default-namespace problem, including the There’s one regression to address before merging. Given: <root xmlns="urn:default">
<p:child2 xmlns:p="urn:p" xmlns="urn:default"/>
</root>Canonicalizing <p:child2 xmlns="urn:default" xmlns:p="urn:p"></p:child2>Master produces that output, but this PR drops The suite currently reports 230 passing and 2 failing. Both failures cover this same regression—with and without comments. Do you think we should preserve the successful #538 fix while ensuring this namespace remains in the canonical output? |
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Inline comments:
In `@test/c14n-non-exclusive-unit-tests.spec.ts`:
- Line 313: Update C14nCanonicalization.renderNs and its findAncestorNs handling
so a prefixed apex still renders a non-empty local unprefixed default namespace
declaration; retain xmlns="" as the clearing state, and apply the behavior
consistently to both canonicalization variants.
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test/c14n-non-exclusive-unit-tests.spec.tstest/canonicalization-unit-tests.spec.ts
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The previous logic incorrectly relied on `node.namespaceURI` to determine the default namespace declaration (`xmlns=""` or `xmlns="..."`). `xmldom` reports `xmlns` as an attribute, and `node.namespaceURI` represents the element's own namespace, not always its declared default namespace. This change explicitly reads the `xmlns` attribute to correctly identify the local default namespace, ensuring compliant rendering according to the W3C C14n specification.
The C14N specification dictates that a default namespace declaration on a descendant element should be omitted if the same default namespace is already in scope from an ancestor. Previously, the algorithm might not have correctly tracked the active default namespace from ancestor elements. This change ensures that the inherited default namespace is properly identified and considered when constructing the namespace list for the canonicalized output, preventing redundant `xmlns="..."` declarations. A new test case verifies this behavior.
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@msheby , I'd like to land this. What do you think? |
Removes verbose or outdated comments and introduces direct references to the W3C C14n specification where applicable, enhancing readability and maintainability of namespace handling logic.
2 participants
Fixes #538
Problem
findNSPrefixreturned only the first xmlns:* attribute found on a subsetelement.
findAncestorNsthen used that single prefix to decide which ancestornamespace declarations to suppress — so any subset element that declared more
than one namespace would silently let the others through.
The concrete trigger is SMPTE ST 430-3 ETMs, where the XML signature covers
<AuthenticatedPrivate xmlns:enc="http://www.w3.org/2001/04/xmlenc#">as asubset reference. That element is in the default namespace inherited from the
document root, and also declares xmlns:enc. findNSPrefix returned "enc",
leaving
{prefix: "", namespaceURI: "…ETM…"}in the ancestor list. The C14Nserializer then rendered the default namespace twice — once from the element
itself via the defaultNs != currNs branch, and once from the hoisted ancestor
entry — producing a digest that no conformant implementation would ever match.
Fix
Replace
findNSPrefix(returns a single string) withfindSubsetNSPrefixes(returns a Set) that collects every xmlns:* attribute on the subset
element and always includes the element's own namespace prefix ("" for the
default namespace). findAncestorNs now uses Set.has() for the filter.
The change is backward-compatible: it can only suppress more ancestor entries
than before — no previously-hoisted namespace starts being retained.
Tests added
declares a prefixed namespace
in the same scenario
xmlns="…" declaration
Summary by CodeRabbit
Bug Fixes
xmlns.Tests