DongHyeonkaandClaude Opus 5
b2963105a8
The keycloak project ended with four open questions that design could not
settle. A two-VM lab was built to answer them by measurement, and this is
that material: 26 experiments, 125 raw command outputs, 22 browser captures.
Follows the import procedure in README.md.
source/ the originating repository verbatim — 78 documents, 28 SVGs,
8 manifests, plus .source-revision recording the commit
final/ the SSOT
document.md 729 lines written from the 29 experiment documents, not
concatenated: what was predicted, what was measured, and
where the measurement itself was wrong
evidence/raw 125 outputs, flattened to <experiment>__<file> because
the originals collided (01-baseline.txt appeared three
times) and the audit only globs the top level
evidence/meta one per raw file; command and exitCode are null and the
README says why rather than inventing them
evidence/browser 22 captures
assets/ three diagrams through techviz
.techviz/ their VizSpecs
A separate project rather than an addition to keycloak: the B-layer answers
that project's four questions, but the A, C and D layers are about cluster
failure, SSO and operations, and one document.md should hold one subject.
The four question records there can point here through 관계.
Recorded rather than papered over: only three of the 28 diagrams were
remade. The repository forbids hand-drawn SVG and forbids titles inside the
canvas; all 28 originals carry both, so converting them is redrawing, not
reformatting. They stay in source/ and the gap is written into the document.
verify-pipeline.py passes. audit-records.py reports no issues.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
51 lines
2.9 KiB
Markdown
51 lines
2.9 KiB
Markdown
---
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kind: CONCEPT
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slug: adapter-outbound-fileserver-c02
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title: 파싱은 되지만 우리가 쓰지 않았을 형태를 전부 거부한다
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topic: schema-and-wire-models
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project: clean-architecture-backend-template
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status: 게시 전
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sourceRevision: 21234e38cdb9a926cbc92bb97a2aee2e4a7d2916
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rootTreeNode: concept:adapter-outbound-fileserver-c02
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evidenceCapturedOn: 2026-09-01
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assets:
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- key: adapter-outbound-fileserver-c02
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file: ../../../final/evidence/rendered/adapter-outbound-fileserver-c02.svg
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evidence:
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- ../../../final/evidence/raw/adapter-outbound-fileserver-c02.txt
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source:
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- 원본 분석 절은 analysis/08-adapter-outbound-fileserver.md#L168 이다.
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module: adapter-outbound-fileserver
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---
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# 파싱은 되지만 우리가 쓰지 않았을 형태를 전부 거부한다
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`FileserverControlRecordCodec`이 decode 직후 재encode해 바이트를 비교한다(`requireCanonical(bytes, encodeOperation(record))`).
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## 본문
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<!-- body:start -->
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`FileserverControlRecordCodec`은 세 레코드와 receipt snapshot에 대해 **decode 직후 재encode해 바이트를 비교**한다(`requireCanonical(bytes, encodeOperation(record))`). 그래서 "파싱은 되지만 우리가 쓰지 않았을 형태"가 전부 거부된다 — 공백, 필드 재배열, 이스케이프, `-0`·선행 0 같은 숫자 표기, 후행 콘텐츠.
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## FileserverControlRecordCodec 참조 위치
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:::evidence key="adapter-outbound-fileserver-c02" alt="코드베이스에서 FileserverControlRecordCodec 를 검색한 출력 12줄. 이 기록이 세는 참조가 그 출력에 그대로 보인다." caption="FileserverControlRecordCodec 코드베이스 검색 — 12줄 · exit 0" zoom="true"
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:::
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## 파서 자체도 좁다
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- 필드 집합을 **정확히 일치**시킨다(`values.keySet().equals(allowedFields)`) — 누락도 미지 필드도 거부
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- 중복 키를 거부한다(`putIfAbsent`)
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- UTF-8 디코딩이 `REPORT` 모드라 malformed 바이트가 대체문자로 조용히 바뀌지 않는다
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- `\b \f \n \r \t` 이스케이프를 **문법 수준에서 거부**한다("control characters are forbidden")
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- 짝 없는 서로게이트를 거부한다(`requireWellFormedUnicode`)
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- `Instant.parse` 후 `result.toString().equals(value)`로 **canonical UTC 표기**만 받는다
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- receipt snapshot은 `rsv1.` 접두사 + unpadded base64url이고, 디코딩 후 **재인코딩 문자열 비교**로 alias(후행 비트가 0이 아닌 변형)를 거부한다
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## 오버플로가 상한 검사를 무력화하지 못한다
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`requireFormulaCountWithinCells`가 `rowCount * columnCount` 곱을 하기 전에 `rowCount <= Long.MAX_VALUE / columnCount`를 먼저 본다. test가 그 하나하나를 이름으로 고정한다 — `canonicalDecoderRejectsWhitespaceReorderingEscapesNumbersUtf8AndTrailingContent`, `receiptSnapshotRejectsBase64urlAliasWithNonZeroTrailingBits`, `canonicalCodecRoundTripsSupplementaryUnicodeInOpaqueText`, `formulaMitigationCountCannotExceedCellsAndUsesOverflowSafeBounds`.
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<!-- body:end -->
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