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authentik/passbook/sources/oauth/clients/oauth2.py

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"""OAuth 2 Clients"""
from json import loads
from typing import Any, Dict, Optional
from urllib.parse import parse_qsl
from django.utils.crypto import constant_time_compare, get_random_string
from requests.exceptions import RequestException
from requests.models import Response
from structlog import get_logger
from passbook import __version__
from passbook.sources.oauth.clients.base import BaseOAuthClient
LOGGER = get_logger()
class OAuth2Client(BaseOAuthClient):
"""OAuth2 Client"""
_default_headers = {
"Accept": "application/json",
}
def check_application_state(self) -> bool:
"Check optional state parameter."
stored = self.request.session.get(self.session_key, None)
returned = self.request.GET.get("state", None)
check = False
if stored is not None:
if returned is not None:
check = constant_time_compare(stored, returned)
else:
LOGGER.warning("No state parameter returned by the source.")
else:
LOGGER.warning("No state stored in the session.")
return check
def get_application_state(self) -> str:
"Generate state optional parameter."
return get_random_string(32)
def get_access_token(self, **request_kwargs) -> Optional[Dict[str, Any]]:
"Fetch access token from callback request."
callback = self.request.build_absolute_uri(self.callback or self.request.path)
if not self.check_application_state():
LOGGER.warning("Application state check failed.")
return None
if "code" in self.request.GET:
args = {
"client_id": self.source.consumer_key,
"redirect_uri": callback,
"client_secret": self.source.consumer_secret,
"code": self.request.GET["code"],
"grant_type": "authorization_code",
}
else:
LOGGER.warning("No code returned by the source")
return None
try:
response = self.session.request(
"post",
self.source.access_token_url,
data=args,
headers=self._default_headers,
)
response.raise_for_status()
except RequestException as exc:
LOGGER.warning("Unable to fetch access token", exc=exc)
return None
else:
return response.json()
def get_redirect_args(self) -> Dict[str, str]:
"Get request parameters for redirect url."
callback = self.request.build_absolute_uri(self.callback)
client_id: str = self.source.consumer_key
args: Dict[str, str] = {
"client_id": client_id,
"redirect_uri": callback,
"response_type": "code",
}
state = self.get_application_state()
if state is not None:
args["state"] = state
self.request.session[self.session_key] = state
return args
def parse_raw_token(self, raw_token: str) -> Dict[str, Any]:
"Parse token and secret from raw token response."
# Load as json first then parse as query string
try:
token_data = loads(raw_token)
except ValueError:
return dict(parse_qsl(raw_token))
else:
return token_data
def do_request(self, method: str, url: str, **kwargs) -> Response:
"Build remote url request. Constructs necessary auth."
if "token" in kwargs:
token = self.parse_raw_token(kwargs.pop("token"))
params = kwargs.get("params", {})
params["access_token"] = token["access_token"]
kwargs["params"] = params
headers = kwargs.get("headers", {})
headers["Authorization"] = f"{token['token_type']} {token['access_token']}"
return super().do_request(method, url, **kwargs)
@property
def session_key(self):
return "oauth-client-{0}-request-state".format(self.source.name)