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authentik/passbook/oauth_client/clients.py

247 lines
9.1 KiB
Python

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