Missing documentation for the new public method ex_find_or_import_keypair_by_key_material. Public methods should have docstrings that describe their purpose, parameters, return values, and any exceptions they may raise. Consider following the pattern from the EC2 driver's implementation for consistency.

Missing test coverage for the new auth parameter functionality. The existing test_create_node test does not cover the new authentication parameter flow. Consider adding tests for: 1) creating a node with the auth parameter and a new keypair, 2) creating a node with the auth parameter when the keypair already exists, and 3) the mutual exclusivity validation that raises AttributeError when both auth and ex_keyname are provided.

Trailing whitespace detected. Remove the trailing whitespace at the end of this line to maintain consistency with the rest of the codebase and adhere to Python style guidelines (PEP 8).

Trailing whitespace detected. Remove the trailing whitespace at the end of this line to maintain consistency with the rest of the codebase and adhere to Python style guidelines (PEP 8).

Potential issue with key name collision. If the same public key material already exists in OVH but with a different name than the generated one (computed from fingerprint and comment), attempting to import it on line 166 may fail if OVH enforces uniqueness on public key material. Consider handling potential exceptions from import_key_pair_from_string and checking if the failure is due to a duplicate key, in which case you should search for the existing key by its fingerprint or public key material and return that instead.

Missing space after comma. Should be self.ex_find_or_import_keypair_by_key_material(location, auth.pubkey) for consistency with Python style guidelines (PEP 8).

Missing space around assignment operator. Should be key_pair = self.import_key_pair_from_string(...) for consistency with Python style guidelines (PEP 8).

Inconsistent return value structure and potential issue with None value. Line 162 returns keyId (from key_pair.extra["id"]) but line 167 returns keyFingerprint (from key_pair.fingerprint). However, the _to_key_pair method (line 612) sets fingerprint=None for OVH keypairs, so this will return None instead of a valid fingerprint value. Both code paths should return the same dictionary structure with the same keys. Since the calling code on line 149 only uses key["keyName"], you should either: 1) return keyId in both cases (preferred, for consistency), or 2) ensure that only keyName is used and remove the extra keys from the return values.