rekor v2: Workaround mypys issue with enums

Signed-off-by: Jussi Kukkonen <[email protected]>

Author: jku

sigstore/_internal/rekor/client_v2.py

@@ -20,6 +20,7 @@
 
 import json
 import logging
+from typing import cast
 
 import rekor_types
 import requests
@@ -106,7 +107,10 @@ def _get_key_details(certificate: Certificate) -> common_v1.PublicKeyDetails:
         public_key = certificate.public_key()
         if isinstance(public_key, EllipticCurvePublicKey):
             if public_key.curve.name == "secp256r1":
-                return common_v1.PublicKeyDetails.PKIX_ECDSA_P256_SHA_256
+                return cast(
+                    common_v1.PublicKeyDetails,
+                    common_v1.PublicKeyDetails.PKIX_ECDSA_P256_SHA_256,
+                )
             raise ValueError(f"Unsupported EC curve: {public_key.curve.name}")
         raise ValueError(f"Unsupported public key type: {type(public_key)}")