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File Name : jwks_client.py

import json
import urllib.request
from functools import lru_cache
from ssl import SSLContext
from typing import Any, Dict, List, Optional
from urllib.error import URLError

from .api_jwk import PyJWK, PyJWKSet
from .api_jwt import decode_complete as decode_token
from .exceptions import PyJWKClientConnectionError, PyJWKClientError
from .jwk_set_cache import JWKSetCache

class PyJWKClient:
    def __init__(
        self,
        uri: str,
        cache_keys: bool = False,
        max_cached_keys: int = 16,
        cache_jwk_set: bool = True,
        lifespan: int = 300,
        headers: Optional[Dict[str, Any]] = None,
        timeout: int = 30,
        ssl_context: Optional[SSLContext] = None,
    ):
        if headers is None:
            headers = {}
        self.uri = uri
        self.jwk_set_cache: Optional[JWKSetCache] = None
        self.headers = headers
        self.timeout = timeout
        self.ssl_context = ssl_context

if cache_jwk_set:
            # Init jwt set cache with default or given lifespan.
            # Default lifespan is 300 seconds (5 minutes).
            if lifespan <= 0:
                raise PyJWKClientError(
                    f'Lifespan must be greater than 0, the input is "{lifespan}"'
                )
            self.jwk_set_cache = JWKSetCache(lifespan)
        else:
            self.jwk_set_cache = None

if cache_keys:
            # Cache signing keys
            # Ignore mypy (https://github.com/python/mypy/issues/2427)
            self.get_signing_key = lru_cache(maxsize=max_cached_keys)(self.get_signing_key)  # type: ignore

def fetch_data(self) -> Any:
        jwk_set: Any = None
        try:
            r = urllib.request.Request(url=self.uri, headers=self.headers)
            with urllib.request.urlopen(
                r, timeout=self.timeout, context=self.ssl_context
            ) as response:
                jwk_set = json.load(response)
        except (URLError, TimeoutError) as e:
            raise PyJWKClientConnectionError(
                f'Fail to fetch data from the url, err: "{e}"'
            )
        else:
            return jwk_set
        finally:
            if self.jwk_set_cache is not None:
                self.jwk_set_cache.put(jwk_set)

def get_jwk_set(self, refresh: bool = False) -> PyJWKSet:
        data = None
        if self.jwk_set_cache is not None and not refresh:
            data = self.jwk_set_cache.get()

if data is None:
            data = self.fetch_data()

if not isinstance(data, dict):
            raise PyJWKClientError("The JWKS endpoint did not return a JSON object")

return PyJWKSet.from_dict(data)

def get_signing_keys(self, refresh: bool = False) -> List[PyJWK]:
        jwk_set = self.get_jwk_set(refresh)
        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 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:
        signing_keys = self.get_signing_keys()
        signing_key = self.match_kid(signing_keys, kid)

if not signing_key:
            # If no matching signing key from the jwk set, refresh the jwk set and try again.
            signing_keys = self.get_signing_keys(refresh=True)
            signing_key = self.match_kid(signing_keys, kid)

if not signing_key:
                raise PyJWKClientError(
                    f'Unable to find a signing key that matches: "{kid}"'
                )

return signing_key

def get_signing_key_from_jwt(self, token: str) -> PyJWK:
        unverified = decode_token(token, options={"verify_signature": False})
        header = unverified["header"]
        return self.get_signing_key(header.get("kid"))

@staticmethod
    def match_kid(signing_keys: List[PyJWK], kid: str) -> Optional[PyJWK]:
        signing_key = None

for key in signing_keys:
            if key.key_id == kid:
                signing_key = key
                break

return signing_key

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2026-02-11 06:19:23
..	dir	-	root/root	0755	2026-04-09 07:19:07
__pycache__	dir	-	root/root	0755	2026-02-11 06:19:23
__init__.py	text/x-python	1.63 KB	root/root	0644	2026-01-20 01:00:16
algorithms.py	text/x-python	29.1 KB	root/root	0644	2026-01-20 01:00:16
api_jwk.py	text/x-python	4.1 KB	root/root	0644	2026-01-20 01:00:16
api_jws.py	text/x-python	10.84 KB	root/root	0644	2026-01-20 01:00:16
api_jwt.py	text/x-python	12.34 KB	root/root	0644	2026-01-20 01:00:16
exceptions.py	text/x-python	1.02 KB	root/root	0644	2026-01-20 01:00:16
help.py	text/x-python	1.71 KB	root/root	0644	2026-01-20 01:00:16
jwk_set_cache.py	text/x-python	959 B	root/root	0644	2026-01-20 01:00:16
jwks_client.py	text/x-python	4.12 KB	root/root	0644	2026-01-20 01:00:16
py.typed	application/x-empty	0 B	root/root	0644	2026-01-20 01:00:16
types.py	text/x-python	99 B	root/root	0644	2026-01-20 01:00:16
utils.py	text/x-python	3.81 KB	root/root	0644	2026-01-20 01:00:16
warnings.py	text/plain	59 B	root/root	0644	2026-01-20 01:00:16

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