Function _stable_model_digest

src/google/adk/auth/auth_tool.py:29–48

Returns a stable digest for a pydantic model. The digest is stable across: - Python hash seeds (does not use `hash()`). - Dict insertion ordering differences (canonicalizes via `sort_keys=True`). - Pydantic `model_extra` values (ignored).

(model: BaseModel)

def _stable_model_digest(model: BaseModel) -> str:
  """Returns a stable digest for a pydantic model.

  The digest is stable across:
  - Python hash seeds (does not use `hash()`).
  - Dict insertion ordering differences (canonicalizes via `sort_keys=True`).
  - Pydantic `model_extra` values (ignored).
  """
  if getattr(model, "model_extra", None):
    model = model.model_copy(deep=True)
    model.model_extra.clear()

  dumped = model.model_dump(by_alias=True, exclude_none=True, mode="json")
  canonical_json = json.dumps(
      dumped,
      sort_keys=True,
      ensure_ascii=False,
      separators=(",", ":"),
  )
  return hashlib.sha256(canonical_json.encode("utf-8")).hexdigest()[:16]


class AuthConfig(BaseModelWithConfig):