69 lines
2.3 KiB
Python
69 lines
2.3 KiB
Python
#
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# Copyright (c) 2021 Airbyte, Inc., all rights reserved.
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#
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from typing import Any, Mapping, Tuple
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import pendulum
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import requests
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from base_python.cdk.streams.auth.core import HttpAuthenticator
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class Oauth2Authenticator(HttpAuthenticator):
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"""
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Generates OAuth2.0 access tokens from an OAuth2.0 refresh token and client credentials.
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The generated access token is attached to each request via the Authorization header.
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"""
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def __init__(self, token_refresh_endpoint: str, client_id: str, client_secret: str, refresh_token: str, scopes: [str] = None):
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self.token_refresh_endpoint = token_refresh_endpoint
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self.client_secret = client_secret
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self.client_id = client_id
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self.refresh_token = refresh_token
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self.scopes = scopes
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self._token_expiry_date = pendulum.now().subtract(days=1)
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self._access_token = None
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def get_auth_header(self) -> Mapping[str, Any]:
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return {"Authorization": f"Bearer {self.get_access_token()}"}
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def get_access_token(self):
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if self.token_has_expired():
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t0 = pendulum.now()
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token, expires_in = self.refresh_access_token()
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self._access_token = token
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self._token_expiry_date = t0.add(seconds=expires_in)
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return self._access_token
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def token_has_expired(self) -> bool:
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return pendulum.now() > self._token_expiry_date
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def get_refresh_request_body(self) -> Mapping[str, any]:
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""" Override to define additional parameters """
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payload = {
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"grant_type": "refresh_token",
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"client_id": self.client_id,
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"client_secret": self.client_secret,
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"refresh_token": self.refresh_token,
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}
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if self.scopes:
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payload["scopes"] = self.scopes
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return payload
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def refresh_access_token(self) -> Tuple[str, int]:
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"""
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returns a tuple of (access_token, token_lifespan_in_seconds)
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"""
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try:
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response = requests.request(method="POST", url=self.token_refresh_endpoint, data=self.get_refresh_request_body())
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response.raise_for_status()
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response_json = response.json()
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return response_json["access_token"], response_json["expires_in"]
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except Exception as e:
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raise Exception(f"Error while refreshing access token: {e}") from e
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