153 lines
6.9 KiB
Python
153 lines
6.9 KiB
Python
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# ============================================================
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# 统一 EvidenceItem 与可追溯链 v1（moduleId: core-evidence, 可重生 ✅）
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# plan.md §3.4 / 矩阵「结论、动作、报告可追溯和可复算」：
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# 把 run-id、算法版本、种子、知识版本、用户确认串成一条可复算链
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# ============================================================
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from __future__ import annotations # 前向类型引用
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import hashlib # 链哈希
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import json # 规范化序列化
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from dataclasses import dataclass, field, asdict # 结构化记录
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from typing import Any # 类型标注
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# 证据引用语法：<kind>:<id>（与既有 schedule-version:<id> 协议兼容）
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_EVIDENCE_KINDS = frozenset({
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"schedule-version", "run", "algorithm", "seed", "knowledge", "confirm", "report",
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})
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def evidence_ref(kind: str, ref_id: Any) -> str:
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"""生成统一证据引用：<kind>:<id>（kind 白名单，防注入）。"""
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if kind not in _EVIDENCE_KINDS:
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raise ValueError(f"unknown evidence kind: {kind!r}")
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return f"{kind}:{ref_id}"
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def parse_evidence_ref(ref: str) -> tuple[str, str]:
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"""解析证据引用为 (kind, id)；非法引用抛 ValueError。"""
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if not isinstance(ref, str) or ":" not in ref:
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raise ValueError(f"malformed evidence ref: {ref!r}")
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kind, _, ref_id = ref.partition(":")
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if kind not in _EVIDENCE_KINDS:
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raise ValueError(f"unknown evidence kind: {kind!r}")
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return kind, ref_id
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@dataclass
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class EvidenceItem:
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"""一条结构化证据：可追溯链的原子元素。
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kind: 证据种类（schedule-version/run/algorithm/seed/knowledge/confirm/report）
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ref: 人类可读引用（如 run-<id>）
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version: 版本号（算法/知识/种子版本）
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runId: 求解运行 ID
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engine: 引擎类型（RULE/CP/GA/HYBRID/EXTERNAL）
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seed: 随机种子（复算用）
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inputsHash: 输入包哈希（复算用）
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knowledgeVersion: 知识库版本（RAG 出处）
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confirmId: 用户确认令牌（P2/P3 门禁）
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note: 审批意见/备注
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meta: 额外元数据
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"""
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kind: str
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ref: str
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version: str | None = None
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runId: str | None = None
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engine: str | None = None
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seed: Any = None
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inputsHash: str | None = None
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knowledgeVersion: str | None = None
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confirmId: str | None = None
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note: str | None = None
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meta: dict[str, Any] = field(default_factory=dict)
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def __post_init__(self) -> None:
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if self.kind not in _EVIDENCE_KINDS:
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raise ValueError(f"unknown evidence kind: {self.kind!r}")
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def _canonical_json(value: Any) -> str:
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return json.dumps(value, ensure_ascii=True, sort_keys=True, separators=(",", ":"), default=str)
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def trace_chain(items: list[EvidenceItem | dict[str, Any]]) -> dict[str, Any]:
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"""把多条证据串成可复算链。
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chainHash = SHA256(规范化 JSON 串联)，任何元素/顺序变化都会断链。
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返回 {items, chainHash, count}。
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"""
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normalized: list[dict[str, Any]] = []
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for item in items:
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if isinstance(item, EvidenceItem):
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normalized.append(asdict(item))
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elif isinstance(item, dict):
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normalized.append(dict(item))
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else:
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raise TypeError(f"evidence item must be EvidenceItem or dict, got {type(item)}")
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chain_hash = hashlib.sha256(_canonical_json(normalized).encode("utf-8")).hexdigest()
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return {"items": normalized, "chainHash": chain_hash, "count": len(normalized)}
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def verify_chain(items: list[EvidenceItem | dict[str, Any]], expected_hash: str) -> bool:
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"""校验链哈希（可复算/可追溯）。"""
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return trace_chain(items)["chainHash"] == expected_hash
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def verify_audit_trace(events: list[dict[str, Any]]) -> dict[str, Any]:
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"""审计链完整性校验（矩阵 114：trace 断链检测，重算链哈希逐条比对）。
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遍历 ALGO_RUN 审计的 traceChainHash，重算链哈希逐条比对：
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- 结构校验：哈希格式（64 位十六进制）、traceCount 与 traceSummary 条数一致、
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summary 条目 kind 白名单 + ref 非空；
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- 链重算：若审计 rationale 携带 canonical traceItems（ALGO_RUN 写入时落盘），
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用 trace_chain 重算并与期望 traceChainHash 比对（verify_chain 语义）；
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旧记录（无 traceItems）仅结构校验，避免误报。
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返回 {"ok", "checked", "broken"}；broken 明细：{eventId, expected, actual, reason}。
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"""
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import re as _re
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_hex64 = _re.compile(r"^[0-9a-f]{64}$")
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broken: list[dict[str, Any]] = []
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checked = 0
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for ev in events:
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rationale = ev.get("rationale") or {}
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expected = rationale.get("traceChainHash")
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if not expected:
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continue # 非 trace 审计（无链）跳过
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checked += 1
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event_id = ev.get("id")
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summary = rationale.get("traceSummary")
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count = rationale.get("traceCount")
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if not (isinstance(expected, str) and _hex64.match(expected)):
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broken.append({"eventId": event_id, "expected": str(expected),
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"actual": "invalid-hash", "reason": "bad-hash-format"})
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continue
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if not isinstance(summary, list):
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broken.append({"eventId": event_id, "expected": str(count),
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"actual": "missing-summary", "reason": "missing-summary"})
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continue
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if not isinstance(count, int) or count != len(summary):
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broken.append({"eventId": event_id, "expected": str(count),
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"actual": str(len(summary)), "reason": "count-mismatch"})
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continue
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bad = next((it for it in summary
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if not isinstance(it, dict)
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or it.get("kind") not in _EVIDENCE_KINDS
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or not isinstance(it.get("ref"), str) or not it["ref"]), None)
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if bad is not None:
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broken.append({"eventId": event_id, "expected": "valid-kind/ref",
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"actual": str(bad), "reason": "bad-summary-entry"})
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continue
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items = rationale.get("traceItems") # canonical 全量条目（写入时落盘）
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if isinstance(items, list) and items:
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actual = trace_chain(items)["chainHash"] # 重算链哈希（可复算）
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if actual != expected:
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broken.append({"eventId": event_id, "expected": expected,
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"actual": actual, "reason": "chain-hash-mismatch"})
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return {"ok": len(broken) == 0, "checked": checked, "broken": broken}
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def schedule_version_item(version_id: Any, **kwargs: Any) -> EvidenceItem:
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"""构造 schedule-version 证据项（与既有协议兼容）。"""
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return EvidenceItem(kind="schedule-version", ref=str(version_id), version=str(version_id), **kwargs)
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