get_signing_serializer() — flask Function Reference

Architecture documentation for the get_signing_serializer() function in sessions.py from the flask codebase.

Function python ApplicationCore Scaffolding called by 2

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ApplicationCore→ Scaffolding→ get_signing_serializer() — flask Function Reference

Dependency Diagram

graph TD
  e5e2a111_00ef_e01a_ff8b_016b8e6f11af["get_signing_serializer()"]
  6e107b72_bfbc_d580_f6b3_676e4292673a["SecureCookieSessionInterface"]
  e5e2a111_00ef_e01a_ff8b_016b8e6f11af -->|defined in| 6e107b72_bfbc_d580_f6b3_676e4292673a
  d601925b_3494_f541_847b_645b340fc0a1["open_session()"]
  d601925b_3494_f541_847b_645b340fc0a1 -->|calls| e5e2a111_00ef_e01a_ff8b_016b8e6f11af
  58643c3f_4184_c18b_8361_a7d628d93359["save_session()"]
  58643c3f_4184_c18b_8361_a7d628d93359 -->|calls| e5e2a111_00ef_e01a_ff8b_016b8e6f11af
  style e5e2a111_00ef_e01a_ff8b_016b8e6f11af fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

src/flask/sessions.py lines 317–335

    def get_signing_serializer(self, app: Flask) -> URLSafeTimedSerializer | None:
        if not app.secret_key:
            return None

        keys: list[str | bytes] = []

        if fallbacks := app.config["SECRET_KEY_FALLBACKS"]:
            keys.extend(fallbacks)

        keys.append(app.secret_key)  # itsdangerous expects current key at top
        return URLSafeTimedSerializer(
            keys,  # type: ignore[arg-type]
            salt=self.salt,
            serializer=self.serializer,
            signer_kwargs={
                "key_derivation": self.key_derivation,
                "digest_method": self.digest_method,
            },
        )