246 lines
9.1 KiB
Python
246 lines
9.1 KiB
Python
"""OAuth Clients"""
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import json
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from urllib.parse import parse_qs, urlencode
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from django.conf import settings
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from django.utils.crypto import constant_time_compare, get_random_string
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from django.utils.encoding import force_text
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from requests import Session
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from requests.exceptions import RequestException
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from requests_oauthlib import OAuth1
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from structlog import get_logger
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LOGGER = get_logger()
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class BaseOAuthClient:
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"""Base OAuth Client"""
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_session = None
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def __init__(self, source, token=''): # nosec
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self.source = source
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self.token = token
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self._session = Session()
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self._session.headers.update({'User-Agent': 'web:passbook:%s' % settings.VERSION})
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def get_access_token(self, request, callback=None):
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"Fetch access token from callback request."
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raise NotImplementedError('Defined in a sub-class') # pragma: no cover
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def get_profile_info(self, raw_token):
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"Fetch user profile information."
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try:
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response = self.request('get', self.source.profile_url, token=raw_token)
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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 user profile: %s', exc)
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return None
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else:
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return response.json() or response.text
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def get_redirect_args(self, request, callback):
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"Get request parameters for redirect url."
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raise NotImplementedError('Defined in a sub-class') # pragma: no cover
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def get_redirect_url(self, request, callback, parameters=None):
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"Build authentication redirect url."
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args = self.get_redirect_args(request, callback=callback)
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additional = parameters or {}
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args.update(additional)
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params = urlencode(args)
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LOGGER.info("Redirect args: %s", args)
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return '{0}?{1}'.format(self.source.authorization_url, params)
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def parse_raw_token(self, raw_token):
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"Parse token and secret from raw token response."
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raise NotImplementedError('Defined in a sub-class') # pragma: no cover
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def request(self, method, url, **kwargs):
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"Build remote url request."
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return self._session.request(method, url, **kwargs)
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@property
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def session_key(self):
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"""
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Return Session Key
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"""
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raise NotImplementedError('Defined in a sub-class') # pragma: no cover
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class OAuthClient(BaseOAuthClient):
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"""OAuth1 Client"""
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def get_access_token(self, request, callback=None):
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"Fetch access token from callback request."
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raw_token = request.session.get(self.session_key, None)
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verifier = request.GET.get('oauth_verifier', None)
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if raw_token is not None and verifier is not None:
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data = {'oauth_verifier': verifier}
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callback = request.build_absolute_uri(callback or request.path)
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callback = force_text(callback)
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try:
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response = self.request('post', self.source.access_token_url,
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token=raw_token, data=data, oauth_callback=callback)
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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: %s', exc)
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return None
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else:
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return response.text
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return None
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def get_request_token(self, request, callback):
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"Fetch the OAuth request token. Only required for OAuth 1.0."
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callback = force_text(request.build_absolute_uri(callback))
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try:
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response = self.request(
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'post', self.source.request_token_url, oauth_callback=callback)
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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 request token: %s', exc)
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return None
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else:
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return response.text
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def get_redirect_args(self, request, callback):
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"Get request parameters for redirect url."
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callback = force_text(request.build_absolute_uri(callback))
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raw_token = self.get_request_token(request, callback)
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token, secret = self.parse_raw_token(raw_token)
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if token is not None and secret is not None:
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request.session[self.session_key] = raw_token
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return {
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'oauth_token': token,
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'oauth_callback': callback,
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}
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def parse_raw_token(self, raw_token):
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"Parse token and secret from raw token response."
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if raw_token is None:
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return (None, None)
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query_string = parse_qs(raw_token)
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token = query_string.get('oauth_token', [None])[0]
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secret = query_string.get('oauth_token_secret', [None])[0]
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return (token, secret)
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def request(self, method, url, **kwargs):
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"Build remote url request. Constructs necessary auth."
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user_token = kwargs.pop('token', self.token)
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token, secret = self.parse_raw_token(user_token)
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callback = kwargs.pop('oauth_callback', None)
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verifier = kwargs.get('data', {}).pop('oauth_verifier', None)
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oauth = OAuth1(
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resource_owner_key=token,
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resource_owner_secret=secret,
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client_key=self.source.consumer_key,
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client_secret=self.source.consumer_secret,
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verifier=verifier,
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callback_uri=callback,
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)
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kwargs['auth'] = oauth
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return super(OAuthClient, self).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-token'.format(self.source.name)
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class OAuth2Client(BaseOAuthClient):
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"""OAuth2 Client"""
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def check_application_state(self, request, callback):
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"Check optional state parameter."
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stored = request.session.get(self.session_key, None)
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returned = 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 sesssion.')
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return check
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def get_access_token(self, request, callback=None, **request_kwargs):
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"Fetch access token from callback request."
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callback = request.build_absolute_uri(callback or request.path)
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if not self.check_application_state(request, callback):
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LOGGER.warning('Application state check failed.')
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return None
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if 'code' in 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': 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.request('post', self.source.access_token_url,
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data=args, **request_kwargs)
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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: %s', exc)
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return None
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else:
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return response.text
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def get_application_state(self, request, callback):
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"Generate state optional parameter."
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return get_random_string(32)
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def get_redirect_args(self, request, callback):
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"Get request parameters for redirect url."
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callback = request.build_absolute_uri(callback)
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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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'response_type': 'code',
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}
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state = self.get_application_state(request, callback)
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if state is not None:
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args['state'] = state
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request.session[self.session_key] = state
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return args
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def parse_raw_token(self, raw_token):
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"Parse token and secret from raw token response."
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if raw_token is None:
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return (None, None)
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# Load as json first then parse as query string
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try:
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token_data = json.loads(raw_token)
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except ValueError:
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token = parse_qs(raw_token).get('access_token', [None])[0]
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else:
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token = token_data.get('access_token', None)
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return (token, None)
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def request(self, method, url, **kwargs):
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"Build remote url request. Constructs necessary auth."
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user_token = kwargs.pop('token', self.token)
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token, _ = self.parse_raw_token(user_token)
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if token is not None:
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params = kwargs.get('params', {})
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params['access_token'] = token
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kwargs['params'] = params
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return super(OAuth2Client, self).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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def get_client(source, token=''): # nosec
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"Return the API client for the given source."
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cls = OAuth2Client
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if source.request_token_url:
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cls = OAuthClient
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return cls(source, token)
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