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Allow validating JWT against JWKS without kid #1073

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Allow validating JWT against JWKS without kid #1073

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4a52b38
First draft.
couling Jun 25, 2025
8e1915e
is None
couling Jun 25, 2025
7971a59
Reverse if as a simple way to please mypy
couling Jun 25, 2025
a056821
Move matching expression
couling Jun 25, 2025
0891a02
Update jwt/jwks_client.py
auvipy Jun 26, 2025
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11 changes: 8 additions & 3 deletions jwt/jwks_client.py
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Original file line number Diff line number Diff line change
Expand Up @@ -87,15 +87,15 @@ def get_signing_keys(self, refresh: bool = False) -> List[PyJWK]:
signing_keys = [
jwk_set_key
for jwk_set_key in jwk_set.keys
if jwk_set_key.public_key_use in ["sig", None] and jwk_set_key.key_id
if jwk_set_key.public_key_use in ["sig", None]
]

if not signing_keys:
raise PyJWKClientError("The JWKS endpoint did not contain any signing keys")

return signing_keys

def get_signing_key(self, kid: str) -> PyJWK:
def get_signing_key(self, kid: Optional[str]) -> PyJWK:
signing_keys = self.get_signing_keys()
signing_key = self.match_kid(signing_keys, kid)

Expand All @@ -117,7 +117,12 @@ def get_signing_key_from_jwt(self, token: str | bytes) -> PyJWK:
return self.get_signing_key(header.get("kid"))

@staticmethod
def match_kid(signing_keys: List[PyJWK], kid: str) -> Optional[PyJWK]:
def match_kid(signing_keys: List[PyJWK], kid: Optional[str]) -> Optional[PyJWK]:
if kid is None:
if len(signing_keys) == 1:
return signing_keys[0]
else:
return None
signing_key = None

for key in signing_keys:
Expand Down