Refactor/xml protection - #3194
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… introduce XMLLimits This update removes XMLProtectionException in favor of XMLProtectionResult, introduces XMLLimits for simplified XML constraint management, and refactors XMLProtector and XMLProtectionInterceptor for improved readability and modularity.
Introduced a configurable limit for attribute name length, enhancing XML protection capabilities. Updated `XMLLimits`, `XMLProtector`, and `XMLProtectionInterceptor` to implement and enforce this limit, along with corresponding tests and documentation.
Eliminated the `count` method from `CollectionsUtil` and its corresponding test case in `CollectionsUtilTest` to reduce unused code and improve maintainability.
…tection Introduced `Rewritten` result type to distinguish documents with removed DTDs from those left unchanged. Updated `XMLProtectionInterceptor`, `XMLProtector`, tests, and documentation to reflect this change, ensuring precise behavior handling.
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe XML protection flow now uses shared limits, hardened StAX factories, structured results, DTD inspection, and charset-aware rewriting. It validates names, attributes, depth, and DTD content. The interceptor maps policy violations to 400 responses and non-XML content to 415 responses. ChangesXML protection redesign
Utility and roadmap updates
Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant Request
participant XMLProtectionInterceptor
participant HardenedStaxInputFactory
participant XMLProtector
participant Exchange
Request->>XMLProtectionInterceptor: submit XML body
XMLProtectionInterceptor->>HardenedStaxInputFactory: create hardened DTD-aware factory
XMLProtectionInterceptor->>XMLProtector: validate and protect XML
XMLProtector-->>XMLProtectionInterceptor: Accepted, Rewritten, or Rejected
XMLProtectionInterceptor->>Exchange: forward original or rewritten body
XMLProtectionInterceptor->>Exchange: return policy or content-type response
Poem
🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (4 passed)
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Inline comments:
In
`@core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptor.java`:
- Line 125: Update the DTD-removal flow in XMLProtectionInterceptor so the input
reader does not force UTF-8 when the HTTP charset is absent; preserve and
consistently use the XML declaration’s encoding for input decoding, output
writing, and the resulting declaration. Add a regression test using ISO-8859-1
encoded non-ASCII text with a removable DTD, verifying the text remains intact
after rewriting.
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core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLLimits.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionException.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptor.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionResult.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtector.javacore/src/main/java/com/predic8/membrane/core/util/CollectionsUtil.javacore/src/main/java/com/predic8/membrane/core/util/xml/parser/HardenedStaxInputFactory.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLLimitsTest.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptorTest.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectorTest.javacore/src/test/java/com/predic8/membrane/core/util/CollectionsUtilTest.javadocs/ROADMAP.md
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- core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionException.java
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Replaced `getCharsetOrDefault` with a new `resolveCharset` method in `XMLProtectionInterceptor` to prioritize HTTP-declared charset and fallback to XML declaration. Added test to ensure character encoding preservation and proper handling of non-UTF-8 documents.
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Inline comments:
In
`@core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptor.java`:
- Line 149: Update resolveCharset and its caller handleRequest so
XMLStreamException from the XML probe is converted into the existing Rejected
policy path, producing HTTP 400 with X-Protection; keep body-decoding failures
mapped to HTTP 500. Add a regression test covering malformed XML declarations
and asserting both status 400 and the X-Protection header.
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core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLLimits.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionException.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptor.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionResult.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtector.javacore/src/main/java/com/predic8/membrane/core/util/CollectionsUtil.javacore/src/main/java/com/predic8/membrane/core/util/xml/parser/HardenedStaxInputFactory.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLLimitsTest.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptorTest.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectorTest.javacore/src/test/java/com/predic8/membrane/core/util/CollectionsUtilTest.javadocs/ROADMAP.md
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- core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionException.java
🚧 Files skipped from review as they are similar to previous changes (10)
- core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionResult.java
- docs/ROADMAP.md
- core/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLLimitsTest.java
- core/src/test/java/com/predic8/membrane/core/util/CollectionsUtilTest.java
- core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtector.java
- core/src/main/java/com/predic8/membrane/core/util/xml/parser/HardenedStaxInputFactory.java
- core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLLimits.java
- core/src/main/java/com/predic8/membrane/core/util/CollectionsUtil.java
- core/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectorTest.java
- core/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptorTest.java
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Added handling for invalid or unsupported `encoding` attributes during XML charset resolution in `XMLProtectionInterceptor`. Provides detailed rejection messages pinpointing the issue. Introduced corresponding test case for malformed XML declarations.
Added `DoctypeInspector` utility to analyze DOCTYPE declarations for external entity references or subset references. Updated `XMLProtector` to leverage this utility, improving modularization and clarity, along with dedicated tests for `DoctypeInspector`.
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🤖 Prompt for all review comments with AI agents
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Inline comments:
In
`@core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptor.java`:
- Line 128: Update scanAndRewrite and its XMLProtector rewrite path so a
Rewritten result emits an XML declaration matching charset.name(), or omits the
declaration, instead of preserving the original encoding declaration. Add a
regression test covering a differing HTTP charset and non-ASCII content after
DTD removal.
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📒 Files selected for processing (6)
core/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/DoctypeInspector.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionInterceptor.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectionResult.javacore/src/main/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtector.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/DoctypeInspectorTest.javacore/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectorTest.java
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- core/src/test/java/com/predic8/membrane/core/interceptor/xmlprotection/XMLProtectorTest.java
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Added charset handling to `XMLProtector` and updated `XMLProtectionInterceptor` to ensure rewritten XML documents declare the correct actual encoding instead of their original declared encoding. Includes updated tests to verify this behavior.
…rt handling Introduced `AbstractBodyProtectionInterceptor` for document-level checks on requests and responses, supporting both plain and multipart bodies with rewriting capabilities. Added multipart support utilities, including `PartRewriter` for reconstructing modified parts and `Origin` for violation tracing. Includes new tests for multipart handling and JSON limits.
rrayst
approved these changes
Sep 4, 2026
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Summary by CodeRabbit
New Features
Bug Fixes
Documentation