450 lines
18 KiB
Python
450 lines
18 KiB
Python
from authlib.common.security import generate_token
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from authlib.common.urls import url_decode
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from .rfc6749.parameters import (
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prepare_grant_uri,
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prepare_token_request,
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parse_authorization_code_response,
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parse_implicit_response,
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)
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from .rfc7009 import prepare_revoke_token_request
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from .rfc7636 import create_s256_code_challenge
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from .auth import TokenAuth, ClientAuth
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from .base import OAuth2Error
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DEFAULT_HEADERS = {
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'Accept': 'application/json',
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'Content-Type': 'application/x-www-form-urlencoded;charset=UTF-8'
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}
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class OAuth2Client:
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"""Construct a new OAuth 2 protocol client.
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:param session: Requests session object to communicate with
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authorization server.
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:param client_id: Client ID, which you get from client registration.
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:param client_secret: Client Secret, which you get from registration.
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:param token_endpoint_auth_method: client authentication method for
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token endpoint.
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:param revocation_endpoint_auth_method: client authentication method for
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revocation endpoint.
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:param scope: Scope that you needed to access user resources.
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:param state: Shared secret to prevent CSRF attack.
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:param redirect_uri: Redirect URI you registered as callback.
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:param code_challenge_method: PKCE method name, only S256 is supported.
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:param token: A dict of token attributes such as ``access_token``,
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``token_type`` and ``expires_at``.
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:param token_placement: The place to put token in HTTP request. Available
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values: "header", "body", "uri".
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:param update_token: A function for you to update token. It accept a
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:class:`OAuth2Token` as parameter.
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:param leeway: Time window in seconds before the actual expiration of the
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authentication token, that the token is considered expired and will
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be refreshed.
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"""
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client_auth_class = ClientAuth
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token_auth_class = TokenAuth
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oauth_error_class = OAuth2Error
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EXTRA_AUTHORIZE_PARAMS = (
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'response_mode', 'nonce', 'prompt', 'login_hint'
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)
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SESSION_REQUEST_PARAMS = []
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def __init__(self, session, client_id=None, client_secret=None,
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token_endpoint_auth_method=None,
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revocation_endpoint_auth_method=None,
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scope=None, state=None, redirect_uri=None, code_challenge_method=None,
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token=None, token_placement='header', update_token=None, leeway=60,
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**metadata):
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self.session = session
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self.client_id = client_id
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self.client_secret = client_secret
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self.state = state
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if token_endpoint_auth_method is None:
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if client_secret:
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token_endpoint_auth_method = 'client_secret_basic'
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else:
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token_endpoint_auth_method = 'none'
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self.token_endpoint_auth_method = token_endpoint_auth_method
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if revocation_endpoint_auth_method is None:
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if client_secret:
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revocation_endpoint_auth_method = 'client_secret_basic'
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else:
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revocation_endpoint_auth_method = 'none'
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self.revocation_endpoint_auth_method = revocation_endpoint_auth_method
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self.scope = scope
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self.redirect_uri = redirect_uri
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self.code_challenge_method = code_challenge_method
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self.token_auth = self.token_auth_class(token, token_placement, self)
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self.update_token = update_token
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token_updater = metadata.pop('token_updater', None)
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if token_updater:
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raise ValueError('update token has been redesigned, checkout the documentation')
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self.metadata = metadata
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self.compliance_hook = {
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'access_token_response': set(),
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'refresh_token_request': set(),
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'refresh_token_response': set(),
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'revoke_token_request': set(),
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'introspect_token_request': set(),
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}
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self._auth_methods = {}
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self.leeway = leeway
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def register_client_auth_method(self, auth):
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"""Extend client authenticate for token endpoint.
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:param auth: an instance to sign the request
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"""
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if isinstance(auth, tuple):
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self._auth_methods[auth[0]] = auth[1]
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else:
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self._auth_methods[auth.name] = auth
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def client_auth(self, auth_method):
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if isinstance(auth_method, str) and auth_method in self._auth_methods:
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auth_method = self._auth_methods[auth_method]
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return self.client_auth_class(
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client_id=self.client_id,
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client_secret=self.client_secret,
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auth_method=auth_method,
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)
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@property
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def token(self):
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return self.token_auth.token
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@token.setter
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def token(self, token):
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self.token_auth.set_token(token)
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def create_authorization_url(self, url, state=None, code_verifier=None, **kwargs):
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"""Generate an authorization URL and state.
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:param url: Authorization endpoint url, must be HTTPS.
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:param state: An optional state string for CSRF protection. If not
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given it will be generated for you.
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:param code_verifier: An optional code_verifier for code challenge.
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:param kwargs: Extra parameters to include.
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:return: authorization_url, state
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"""
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if state is None:
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state = generate_token()
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response_type = self.metadata.get('response_type', 'code')
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response_type = kwargs.pop('response_type', response_type)
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if 'redirect_uri' not in kwargs:
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kwargs['redirect_uri'] = self.redirect_uri
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if 'scope' not in kwargs:
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kwargs['scope'] = self.scope
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if code_verifier and response_type == 'code' and self.code_challenge_method == 'S256':
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kwargs['code_challenge'] = create_s256_code_challenge(code_verifier)
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kwargs['code_challenge_method'] = self.code_challenge_method
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for k in self.EXTRA_AUTHORIZE_PARAMS:
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if k not in kwargs and k in self.metadata:
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kwargs[k] = self.metadata[k]
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uri = prepare_grant_uri(
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url, client_id=self.client_id, response_type=response_type,
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state=state, **kwargs)
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return uri, state
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def fetch_token(self, url=None, body='', method='POST', headers=None,
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auth=None, grant_type=None, state=None, **kwargs):
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"""Generic method for fetching an access token from the token endpoint.
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:param url: Access Token endpoint URL, if not configured,
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``authorization_response`` is used to extract token from
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its fragment (implicit way).
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:param body: Optional application/x-www-form-urlencoded body to add the
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include in the token request. Prefer kwargs over body.
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:param method: The HTTP method used to make the request. Defaults
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to POST, but may also be GET. Other methods should
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be added as needed.
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:param headers: Dict to default request headers with.
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:param auth: An auth tuple or method as accepted by requests.
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:param grant_type: Use specified grant_type to fetch token
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:return: A :class:`OAuth2Token` object (a dict too).
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"""
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state = state or self.state
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# implicit grant_type
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authorization_response = kwargs.pop('authorization_response', None)
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if authorization_response and '#' in authorization_response:
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return self.token_from_fragment(authorization_response, state)
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session_kwargs = self._extract_session_request_params(kwargs)
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if authorization_response and 'code=' in authorization_response:
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grant_type = 'authorization_code'
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params = parse_authorization_code_response(
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authorization_response,
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state=state,
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)
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kwargs['code'] = params['code']
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if grant_type is None:
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grant_type = self.metadata.get('grant_type')
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if grant_type is None:
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grant_type = _guess_grant_type(kwargs)
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self.metadata['grant_type'] = grant_type
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body = self._prepare_token_endpoint_body(body, grant_type, **kwargs)
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if auth is None:
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auth = self.client_auth(self.token_endpoint_auth_method)
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if headers is None:
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headers = DEFAULT_HEADERS
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if url is None:
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url = self.metadata.get('token_endpoint')
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return self._fetch_token(
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url, body=body, auth=auth, method=method,
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headers=headers, **session_kwargs
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)
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def token_from_fragment(self, authorization_response, state=None):
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token = parse_implicit_response(authorization_response, state)
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if 'error' in token:
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raise self.oauth_error_class(
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error=token['error'],
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description=token.get('error_description')
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)
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self.token = token
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return token
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def refresh_token(self, url=None, refresh_token=None, body='',
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auth=None, headers=None, **kwargs):
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"""Fetch a new access token using a refresh token.
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:param url: Refresh Token endpoint, must be HTTPS.
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:param refresh_token: The refresh_token to use.
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:param body: Optional application/x-www-form-urlencoded body to add the
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include in the token request. Prefer kwargs over body.
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:param auth: An auth tuple or method as accepted by requests.
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:param headers: Dict to default request headers with.
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:return: A :class:`OAuth2Token` object (a dict too).
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"""
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session_kwargs = self._extract_session_request_params(kwargs)
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refresh_token = refresh_token or self.token.get('refresh_token')
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if 'scope' not in kwargs and self.scope:
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kwargs['scope'] = self.scope
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body = prepare_token_request(
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'refresh_token', body,
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refresh_token=refresh_token, **kwargs
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)
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if headers is None:
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headers = DEFAULT_HEADERS.copy()
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if url is None:
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url = self.metadata.get('token_endpoint')
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for hook in self.compliance_hook['refresh_token_request']:
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url, headers, body = hook(url, headers, body)
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if auth is None:
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auth = self.client_auth(self.token_endpoint_auth_method)
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return self._refresh_token(
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url, refresh_token=refresh_token, body=body, headers=headers,
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auth=auth, **session_kwargs)
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def ensure_active_token(self, token=None):
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if token is None:
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token = self.token
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if not token.is_expired(leeway=self.leeway):
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return True
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refresh_token = token.get('refresh_token')
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url = self.metadata.get('token_endpoint')
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if refresh_token and url:
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self.refresh_token(url, refresh_token=refresh_token)
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return True
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elif self.metadata.get('grant_type') == 'client_credentials':
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access_token = token['access_token']
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new_token = self.fetch_token(url, grant_type='client_credentials')
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if self.update_token:
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self.update_token(new_token, access_token=access_token)
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return True
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def revoke_token(self, url, token=None, token_type_hint=None,
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body=None, auth=None, headers=None, **kwargs):
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"""Revoke token method defined via `RFC7009`_.
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:param url: Revoke Token endpoint, must be HTTPS.
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:param token: The token to be revoked.
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:param token_type_hint: The type of the token that to be revoked.
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It can be "access_token" or "refresh_token".
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:param body: Optional application/x-www-form-urlencoded body to add the
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include in the token request. Prefer kwargs over body.
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:param auth: An auth tuple or method as accepted by requests.
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:param headers: Dict to default request headers with.
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:return: Revocation Response
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.. _`RFC7009`: https://tools.ietf.org/html/rfc7009
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"""
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return self._handle_token_hint(
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'revoke_token_request', url,
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token=token, token_type_hint=token_type_hint,
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body=body, auth=auth, headers=headers, **kwargs)
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def introspect_token(self, url, token=None, token_type_hint=None,
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body=None, auth=None, headers=None, **kwargs):
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"""Implementation of OAuth 2.0 Token Introspection defined via `RFC7662`_.
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:param url: Introspection Endpoint, must be HTTPS.
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:param token: The token to be introspected.
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:param token_type_hint: The type of the token that to be revoked.
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It can be "access_token" or "refresh_token".
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:param body: Optional application/x-www-form-urlencoded body to add the
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include in the token request. Prefer kwargs over body.
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:param auth: An auth tuple or method as accepted by requests.
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:param headers: Dict to default request headers with.
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:return: Introspection Response
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.. _`RFC7662`: https://tools.ietf.org/html/rfc7662
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"""
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return self._handle_token_hint(
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'introspect_token_request', url,
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token=token, token_type_hint=token_type_hint,
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body=body, auth=auth, headers=headers, **kwargs)
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def register_compliance_hook(self, hook_type, hook):
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"""Register a hook for request/response tweaking.
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Available hooks are:
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* access_token_response: invoked before token parsing.
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* refresh_token_request: invoked before refreshing token.
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* refresh_token_response: invoked before refresh token parsing.
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* protected_request: invoked before making a request.
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* revoke_token_request: invoked before revoking a token.
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* introspect_token_request: invoked before introspecting a token.
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"""
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if hook_type == 'protected_request':
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self.token_auth.hooks.add(hook)
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return
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if hook_type not in self.compliance_hook:
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raise ValueError('Hook type %s is not in %s.',
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hook_type, self.compliance_hook)
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self.compliance_hook[hook_type].add(hook)
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def parse_response_token(self, resp):
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if resp.status_code >= 500:
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resp.raise_for_status()
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token = resp.json()
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if 'error' in token:
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raise self.oauth_error_class(
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error=token['error'],
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description=token.get('error_description')
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)
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self.token = token
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return self.token
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def _fetch_token(self, url, body='', headers=None, auth=None,
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method='POST', **kwargs):
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if method.upper() == 'POST':
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resp = self.session.post(
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url, data=dict(url_decode(body)),
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headers=headers, auth=auth, **kwargs)
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else:
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if '?' in url:
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url = '&'.join([url, body])
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else:
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url = '?'.join([url, body])
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resp = self.session.request(method, url, headers=headers, auth=auth, **kwargs)
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for hook in self.compliance_hook['access_token_response']:
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resp = hook(resp)
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return self.parse_response_token(resp)
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def _refresh_token(self, url, refresh_token=None, body='', headers=None,
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auth=None, **kwargs):
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resp = self._http_post(url, body=body, auth=auth, headers=headers, **kwargs)
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for hook in self.compliance_hook['refresh_token_response']:
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resp = hook(resp)
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token = self.parse_response_token(resp)
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if 'refresh_token' not in token:
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self.token['refresh_token'] = refresh_token
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if callable(self.update_token):
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self.update_token(self.token, refresh_token=refresh_token)
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return self.token
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def _handle_token_hint(self, hook, url, token=None, token_type_hint=None,
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body=None, auth=None, headers=None, **kwargs):
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if token is None and self.token:
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token = self.token.get('refresh_token') or self.token.get('access_token')
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if body is None:
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body = ''
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body, headers = prepare_revoke_token_request(
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token, token_type_hint, body, headers)
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for hook in self.compliance_hook[hook]:
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url, headers, body = hook(url, headers, body)
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if auth is None:
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auth = self.client_auth(self.revocation_endpoint_auth_method)
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session_kwargs = self._extract_session_request_params(kwargs)
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return self._http_post(
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url, body, auth=auth, headers=headers, **session_kwargs)
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def _prepare_token_endpoint_body(self, body, grant_type, **kwargs):
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if grant_type == 'authorization_code':
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if 'redirect_uri' not in kwargs:
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kwargs['redirect_uri'] = self.redirect_uri
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return prepare_token_request(grant_type, body, **kwargs)
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if 'scope' not in kwargs and self.scope:
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kwargs['scope'] = self.scope
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return prepare_token_request(grant_type, body, **kwargs)
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def _extract_session_request_params(self, kwargs):
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"""Extract parameters for session object from the passing ``**kwargs``."""
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rv = {}
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for k in self.SESSION_REQUEST_PARAMS:
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if k in kwargs:
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rv[k] = kwargs.pop(k)
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return rv
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def _http_post(self, url, body=None, auth=None, headers=None, **kwargs):
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return self.session.post(
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url, data=dict(url_decode(body)),
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headers=headers, auth=auth, **kwargs)
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def _guess_grant_type(kwargs):
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if 'code' in kwargs:
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grant_type = 'authorization_code'
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elif 'username' in kwargs and 'password' in kwargs:
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grant_type = 'password'
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else:
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grant_type = 'client_credentials'
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return grant_type
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