feat: RFC 6570 URI templates with operator-aware security#2356

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maxisbey wants to merge 32 commits intomainfrom

feat/uri-template-rfc6570

Commits on Mar 26, 2026

feat: add RFC 6570 URI template utility with bidirectional support
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feat: add filesystem path safety primitives
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feat: integrate UriTemplate into MCPServer resource templates
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feat: wire ResourceSecurity into MCPServer configuration
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docs: add migration guide entry for resource template changes
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refactor: accept plain set for ResourceSecurity.exempt_params
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docs: add resources guide covering templates, security, and low-level usage
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feat: reject duplicate variable names in URI templates
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test: add adversarial security test cases for layered defense
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feat: add UriTemplate.is_template() static method
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feat: add URI length guard to UriTemplate.match()
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test: add edge-case coverage for literal handling and anchoring
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feat: reject null bytes in safe_join path components
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fix: decide template vs static purely on URI variables
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fix: correct ; operator matching and expansion per RFC 6570
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refactor: remove post-decode structural checks from UriTemplate.match
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feat: lenient query param matching for {?var} and {&var}
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fix: tighten parse-time validation and document matching limits
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fix: preserve pct-triplets in reserved expansion; allow empty match captures
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refactor: use lists instead of tuples for variable-length sequences
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docs: trim migration guide to breaking changes only
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docs: clarify query leniency and fix exempt_params example
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fix: reject template patterns causing O(n²) regex backtracking
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docs: address reviewer feedback on migration guide and resources doc
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test: close coverage gaps in lenient-query branch and test handlers
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fix: correct lenient query matching for +, fragments, and standalone {&var}
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docs: fix stale docstrings and export DEFAULT_MAX_* constants
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test: move new resource tests to module level per repo convention
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test: close coverage gaps in _parse_query and _split_query_tail fallbacks
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fix: preserve empty list items in explode matching
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refactor: simplify explode split since regex guarantees leading separator
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fix: fall back to strict regex when path contains {#...} or literal #
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