Add reproducible evaluation and provenance research

src/aaisa/models.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 from dataclasses import asdict, dataclass, field
 from enum import IntEnum
+import hashlib
 from pathlib import Path
 from typing import Any
 
@@ -58,10 +59,21 @@ class Finding:
     remediation: str | None = None
     tags: tuple[str, ...] = ()
 
+    def fingerprint(self) -> str:
+        material = "\0".join((
+            self.rule_id,
+            self.artifact_path,
+            str(self.line or 0),
+            str(self.column or 0),
+            self.message,
+        )).encode("utf-8")
+        return hashlib.sha256(material).hexdigest()
+
     def to_dict(self) -> dict[str, Any]:
         result = asdict(self)
         result["severity"] = self.severity.label()
         result["tags"] = list(self.tags)
+        result["fingerprint"] = self.fingerprint()
         return result