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from __future__ import annotations
import json
import time
from typing import Any
from .algorithms import get_default_algorithms, has_crypto, requires_cryptography
from .exceptions import InvalidKeyError, PyJWKError, PyJWKSetError, PyJWTError
from .types import JWKDict
class PyJWK:
def __init__(self, jwk_data: JWKDict, algorithm: str | None = None) -> None:
self._algorithms = get_default_algorithms()
self._jwk_data = jwk_data
kty = self._jwk_data.get("kty", None)
if not kty:
raise InvalidKeyError(f"kty is not found: {self._jwk_data}")
if not algorithm and isinstance(self._jwk_data, dict):
algorithm = self._jwk_data.get("alg", None)
if not algorithm:
# Determine alg with kty (and crv).
crv = self._jwk_data.get("crv", None)
if kty == "EC":
if crv == "P-256" or not crv:
algorithm = "ES256"
elif crv == "P-384":
algorithm = "ES384"
elif crv == "P-521":
algorithm = "ES512"
elif crv == "secp256k1":
algorithm = "ES256K"
else:
raise InvalidKeyError(f"Unsupported crv: {crv}")
elif kty == "RSA":
algorithm = "RS256"
elif kty == "oct":
algorithm = "HS256"
elif kty == "OKP":
if not crv:
raise InvalidKeyError(f"crv is not found: {self._jwk_data}")
if crv == "Ed25519":
algorithm = "EdDSA"
else:
raise InvalidKeyError(f"Unsupported crv: {crv}")
else:
raise InvalidKeyError(f"Unsupported kty: {kty}")
if not has_crypto and algorithm in requires_cryptography:
raise PyJWKError(f"{algorithm} requires 'cryptography' to be installed.")
self.Algorithm = self._algorithms.get(algorithm)
if not self.Algorithm:
raise PyJWKError(f"Unable to find an algorithm for key: {self._jwk_data}")
self.key = self.Algorithm.from_jwk(self._jwk_data)
@staticmethod
def from_dict(obj: JWKDict, algorithm: str | None = None) -> "PyJWK":
return PyJWK(obj, algorithm)
@staticmethod
def from_json(data: str, algorithm: None = None) -> "PyJWK":
obj = json.loads(data)
return PyJWK.from_dict(obj, algorithm)
@property
def key_type(self) -> str | None:
return self._jwk_data.get("kty", None)
@property
def key_id(self) -> str | None:
return self._jwk_data.get("kid", None)
@property
def public_key_use(self) -> str | None:
return self._jwk_data.get("use", None)
class PyJWKSet:
def __init__(self, keys: list[JWKDict]) -> None:
self.keys = []
if not keys:
raise PyJWKSetError("The JWK Set did not contain any keys")
if not isinstance(keys, list):
raise PyJWKSetError("Invalid JWK Set value")
for key in keys:
try:
self.keys.append(PyJWK(key))
except PyJWTError:
# skip unusable keys
continue
if len(self.keys) == 0:
raise PyJWKSetError(
"The JWK Set did not contain any usable keys. Perhaps 'cryptography' is not installed?"
)
@staticmethod
def from_dict(obj: dict[str, Any]) -> "PyJWKSet":
keys = obj.get("keys", [])
return PyJWKSet(keys)
@staticmethod
def from_json(data: str) -> "PyJWKSet":
obj = json.loads(data)
return PyJWKSet.from_dict(obj)
def __getitem__(self, kid: str) -> "PyJWK":
for key in self.keys:
if key.key_id == kid:
return key
raise KeyError(f"keyset has no key for kid: {kid}")
class PyJWTSetWithTimestamp:
def __init__(self, jwk_set: PyJWKSet):
self.jwk_set = jwk_set
self.timestamp = time.monotonic()
def get_jwk_set(self) -> PyJWKSet:
return self.jwk_set
def get_timestamp(self) -> float:
return self.timestamp