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LEASH / SOURCEmerchant-trust-data / processing/entity_resolution.pyOpen live demo ↗

processing/entity_resolution.py

63 lines2,200 bytessha256 bf3bb2db3b4a
  1. """Entity resolution v0:
  3. - Threat-feed records aggregate to one entity per root domain, preserving
  4. per-source context (threat_sources, first/last seen, sample URLs).
  5. - GLEIF companies are unique by LEI.
  6. - Deterministic merchant_id: sha1 of entity key.
  7. """
  9. from __future__ import annotations
  11. import hashlib
  14. def merchant_id_for(entity_key: str) -> str:
  15. return "md_" + hashlib.sha1(entity_key.encode()).hexdigest()[:12]
  18. def merge_threat_records(records: list[dict]) -> list[dict]:
  19. """records: parsed feed rows with keys root_domain, source, url, threat_type,
  20. first_seen, url_source. Returns one merged dict per root domain."""
  21. by_root: dict[str, dict] = {}
  22. for r in records:
  23. root = r["root_domain"]
  24. if not root:
  25. continue
  26. agg = by_root.setdefault(root, {
  27. "entity_key": root,
  28. "root_domain": root,
  29. "sources": set(),
  30. "threat_types": set(),
  31. "urls": [],
  32. "url_sources": [],
  33. "first_seen": None,
  34. "last_seen": None,
  35. })
  36. agg["sources"].add(r["source"])
  37. if r.get("threat_type"):
  38. agg["threat_types"].add(r["threat_type"])
  39. if r.get("url"):
  40. if len(agg["urls"]) < 3:
  41. agg["urls"].append(r["url"])
  42. if r.get("url_source"):
  43. if len(agg["url_sources"]) < 5:
  44. agg["url_sources"].append(r["url_source"])
  45. fs, ls = r.get("first_seen"), r.get("last_seen")
  46. if fs and (agg["first_seen"] is None or fs < agg["first_seen"]):
  47. agg["first_seen"] = fs
  48. if ls and (agg["last_seen"] is None or ls > agg["last_seen"]):
  49. agg["last_seen"] = ls
  50. for agg in by_root.values():
  51. agg["sources"] = sorted(agg["sources"])
  52. agg["threat_types"] = sorted(agg["threat_types"])
  53. return list(by_root.values())
  56. def dedupe_by_entity_key(rows: list[dict]) -> list[dict]:
  57. """Final safety net: one row per entity_key (keeps the first)."""
  58. seen: dict[str, dict] = {}
  59. for row in rows:
  60. key = row.get("entity_key")
  61. if key and key not in seen:
  62. seen[key] = row
  63. return list(seen.values())