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"""Utilities dealing with JSON Web Keys (JWK)"""
from urllib.parse import urljoin
import requests
from flask import current_app as app
from authlib.jose.errors import BadSignatureError
from authlib.jose import KeySet, JsonWebKey, JsonWebToken
from gn3.oauth2.errors import TokenValidationError
def fetch_jwks(authserveruri: str, path: str = "auth/public-jwks") -> KeySet:
"""Fetch the JWKs from a particular URI"""
try:
response = requests.get(urljoin(authserveruri, path))
if response.status_code == 200:
return KeySet([
JsonWebKey.import_key(key) for key in response.json()["jwks"]])
# XXXX: TODO: Catch specific exception we need.
# pylint: disable=W0703
except Exception as _exc:
app.logger.debug("There was an error fetching the JSON Web Keys.",
exc_info=True)
return KeySet([])
def validate_token(token: str, keys: KeySet) -> dict:
"""Validate the token against the given keys."""
for key in keys.keys:
try:
return JsonWebToken(["RS256"]).decode(token, key=key)
except BadSignatureError as _bse:
pass
raise TokenValidationError("No key was found for validation.")
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