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