721 lines
22 KiB
Python
721 lines
22 KiB
Python
# Copyright (C) 2010 Google Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
"""An OAuth 2.0 client.
|
|
|
|
Tools for interacting with OAuth 2.0 protected resources.
|
|
"""
|
|
|
|
__author__ = 'jcgregorio@google.com (Joe Gregorio)'
|
|
|
|
import copy
|
|
import datetime
|
|
import httplib2
|
|
import logging
|
|
import urllib
|
|
import urlparse
|
|
|
|
try: # pragma: no cover
|
|
import simplejson
|
|
except ImportError: # pragma: no cover
|
|
try:
|
|
# Try to import from django, should work on App Engine
|
|
from django.utils import simplejson
|
|
except ImportError:
|
|
# Should work for Python2.6 and higher.
|
|
import json as simplejson
|
|
|
|
try:
|
|
from urlparse import parse_qsl
|
|
except ImportError:
|
|
from cgi import parse_qsl
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
# Expiry is stored in RFC3339 UTC format
|
|
EXPIRY_FORMAT = "%Y-%m-%dT%H:%M:%S.%fZ"
|
|
|
|
|
|
class Error(Exception):
|
|
"""Base error for this module."""
|
|
pass
|
|
|
|
|
|
class FlowExchangeError(Error):
|
|
"""Error trying to exchange an authorization grant for an access token."""
|
|
pass
|
|
|
|
|
|
class AccessTokenRefreshError(Error):
|
|
"""Error trying to refresh an expired access token."""
|
|
pass
|
|
|
|
|
|
class AccessTokenCredentialsError(Error):
|
|
"""Having only the access_token means no refresh is possible."""
|
|
pass
|
|
|
|
|
|
def _abstract():
|
|
raise NotImplementedError('You need to override this function')
|
|
|
|
|
|
class Credentials(object):
|
|
"""Base class for all Credentials objects.
|
|
|
|
Subclasses must define an authorize() method that applies the credentials to
|
|
an HTTP transport.
|
|
|
|
Subclasses must also specify a classmethod named 'from_json' that takes a JSON
|
|
string as input and returns an instaniated Crentials object.
|
|
"""
|
|
|
|
NON_SERIALIZED_MEMBERS = ['store']
|
|
|
|
def authorize(self, http):
|
|
"""Take an httplib2.Http instance (or equivalent) and
|
|
authorizes it for the set of credentials, usually by
|
|
replacing http.request() with a method that adds in
|
|
the appropriate headers and then delegates to the original
|
|
Http.request() method.
|
|
"""
|
|
_abstract()
|
|
|
|
def _to_json(self, strip):
|
|
"""Utility function for creating a JSON representation of an instance of Credentials.
|
|
|
|
Args:
|
|
strip: array, An array of names of members to not include in the JSON.
|
|
|
|
Returns:
|
|
string, a JSON representation of this instance, suitable to pass to
|
|
from_json().
|
|
"""
|
|
t = type(self)
|
|
d = copy.copy(self.__dict__)
|
|
for member in strip:
|
|
del d[member]
|
|
if 'token_expiry' in d and isinstance(d['token_expiry'], datetime.datetime):
|
|
d['token_expiry'] = d['token_expiry'].strftime(EXPIRY_FORMAT)
|
|
# Add in information we will need later to reconsistitue this instance.
|
|
d['_class'] = t.__name__
|
|
d['_module'] = t.__module__
|
|
return simplejson.dumps(d)
|
|
|
|
def to_json(self):
|
|
"""Creating a JSON representation of an instance of Credentials.
|
|
|
|
Returns:
|
|
string, a JSON representation of this instance, suitable to pass to
|
|
from_json().
|
|
"""
|
|
return self._to_json(Credentials.NON_SERIALIZED_MEMBERS)
|
|
|
|
@classmethod
|
|
def new_from_json(cls, s):
|
|
"""Utility class method to instantiate a Credentials subclass from a JSON
|
|
representation produced by to_json().
|
|
|
|
Args:
|
|
s: string, JSON from to_json().
|
|
|
|
Returns:
|
|
An instance of the subclass of Credentials that was serialized with
|
|
to_json().
|
|
"""
|
|
data = simplejson.loads(s)
|
|
# Find and call the right classmethod from_json() to restore the object.
|
|
module = data['_module']
|
|
m = __import__(module)
|
|
for sub_module in module.split('.')[1:]:
|
|
m = getattr(m, sub_module)
|
|
kls = getattr(m, data['_class'])
|
|
from_json = getattr(kls, 'from_json')
|
|
return from_json(s)
|
|
|
|
|
|
class Flow(object):
|
|
"""Base class for all Flow objects."""
|
|
pass
|
|
|
|
|
|
class Storage(object):
|
|
"""Base class for all Storage objects.
|
|
|
|
Store and retrieve a single credential. This class supports locking
|
|
such that multiple processes and threads can operate on a single
|
|
store.
|
|
"""
|
|
|
|
def acquire_lock(self):
|
|
"""Acquires any lock necessary to access this Storage.
|
|
|
|
This lock is not reentrant."""
|
|
pass
|
|
|
|
def release_lock(self):
|
|
"""Release the Storage lock.
|
|
|
|
Trying to release a lock that isn't held will result in a
|
|
RuntimeError.
|
|
"""
|
|
pass
|
|
|
|
def locked_get(self):
|
|
"""Retrieve credential.
|
|
|
|
The Storage lock must be held when this is called.
|
|
|
|
Returns:
|
|
oauth2client.client.Credentials
|
|
"""
|
|
_abstract()
|
|
|
|
def locked_put(self, credentials):
|
|
"""Write a credential.
|
|
|
|
The Storage lock must be held when this is called.
|
|
|
|
Args:
|
|
credentials: Credentials, the credentials to store.
|
|
"""
|
|
_abstract()
|
|
|
|
def get(self):
|
|
"""Retrieve credential.
|
|
|
|
The Storage lock must *not* be held when this is called.
|
|
|
|
Returns:
|
|
oauth2client.client.Credentials
|
|
"""
|
|
self.acquire_lock()
|
|
try:
|
|
return self.locked_get()
|
|
finally:
|
|
self.release_lock()
|
|
|
|
def put(self, credentials):
|
|
"""Write a credential.
|
|
|
|
The Storage lock must be held when this is called.
|
|
|
|
Args:
|
|
credentials: Credentials, the credentials to store.
|
|
"""
|
|
self.acquire_lock()
|
|
try:
|
|
self.locked_put(credentials)
|
|
finally:
|
|
self.release_lock()
|
|
|
|
|
|
class OAuth2Credentials(Credentials):
|
|
"""Credentials object for OAuth 2.0.
|
|
|
|
Credentials can be applied to an httplib2.Http object using the authorize()
|
|
method, which then signs each request from that object with the OAuth 2.0
|
|
access token.
|
|
|
|
OAuth2Credentials objects may be safely pickled and unpickled.
|
|
"""
|
|
|
|
def __init__(self, access_token, client_id, client_secret, refresh_token,
|
|
token_expiry, token_uri, user_agent):
|
|
"""Create an instance of OAuth2Credentials.
|
|
|
|
This constructor is not usually called by the user, instead
|
|
OAuth2Credentials objects are instantiated by the OAuth2WebServerFlow.
|
|
|
|
Args:
|
|
access_token: string, access token.
|
|
client_id: string, client identifier.
|
|
client_secret: string, client secret.
|
|
refresh_token: string, refresh token.
|
|
token_expiry: datetime, when the access_token expires.
|
|
token_uri: string, URI of token endpoint.
|
|
user_agent: string, The HTTP User-Agent to provide for this application.
|
|
|
|
Notes:
|
|
store: callable, a callable that when passed a Credential
|
|
will store the credential back to where it came from.
|
|
This is needed to store the latest access_token if it
|
|
has expired and been refreshed.
|
|
"""
|
|
self.access_token = access_token
|
|
self.client_id = client_id
|
|
self.client_secret = client_secret
|
|
self.refresh_token = refresh_token
|
|
self.store = None
|
|
self.token_expiry = token_expiry
|
|
self.token_uri = token_uri
|
|
self.user_agent = user_agent
|
|
|
|
# True if the credentials have been revoked or expired and can't be
|
|
# refreshed.
|
|
self.invalid = False
|
|
|
|
def to_json(self):
|
|
return self._to_json(Credentials.NON_SERIALIZED_MEMBERS)
|
|
|
|
@classmethod
|
|
def from_json(cls, s):
|
|
"""Instantiate a Credentials object from a JSON description of it. The JSON
|
|
should have been produced by calling .to_json() on the object.
|
|
|
|
Args:
|
|
data: dict, A deserialized JSON object.
|
|
|
|
Returns:
|
|
An instance of a Credentials subclass.
|
|
"""
|
|
data = simplejson.loads(s)
|
|
if 'token_expiry' in data and not isinstance(data['token_expiry'],
|
|
datetime.datetime):
|
|
data['token_expiry'] = datetime.datetime.strptime(
|
|
data['token_expiry'], EXPIRY_FORMAT)
|
|
retval = OAuth2Credentials(
|
|
data['access_token'],
|
|
data['client_id'],
|
|
data['client_secret'],
|
|
data['refresh_token'],
|
|
data['token_expiry'],
|
|
data['token_uri'],
|
|
data['user_agent'])
|
|
retval.invalid = data['invalid']
|
|
return retval
|
|
|
|
@property
|
|
def access_token_expired(self):
|
|
"""True if the credential is expired or invalid.
|
|
|
|
If the token_expiry isn't set, we assume the token doesn't expire.
|
|
"""
|
|
if self.invalid:
|
|
return True
|
|
|
|
if not self.token_expiry:
|
|
return False
|
|
|
|
now = datetime.datetime.utcnow()
|
|
if now >= self.token_expiry:
|
|
logger.info('access_token is expired. Now: %s, token_expiry: %s',
|
|
now, self.token_expiry)
|
|
return True
|
|
return False
|
|
|
|
def set_store(self, store):
|
|
"""Set the Storage for the credential.
|
|
|
|
Args:
|
|
store: Storage, an implementation of Stroage object.
|
|
This is needed to store the latest access_token if it
|
|
has expired and been refreshed. This implementation uses
|
|
locking to check for updates before updating the
|
|
access_token.
|
|
"""
|
|
self.store = store
|
|
|
|
def _updateFromCredential(self, other):
|
|
"""Update this Credential from another instance."""
|
|
self.__dict__.update(other.__getstate__())
|
|
|
|
def __getstate__(self):
|
|
"""Trim the state down to something that can be pickled."""
|
|
d = copy.copy(self.__dict__)
|
|
del d['store']
|
|
return d
|
|
|
|
def __setstate__(self, state):
|
|
"""Reconstitute the state of the object from being pickled."""
|
|
self.__dict__.update(state)
|
|
self.store = None
|
|
|
|
def _generate_refresh_request_body(self):
|
|
"""Generate the body that will be used in the refresh request."""
|
|
body = urllib.urlencode({
|
|
'grant_type': 'refresh_token',
|
|
'client_id': self.client_id,
|
|
'client_secret': self.client_secret,
|
|
'refresh_token': self.refresh_token,
|
|
})
|
|
return body
|
|
|
|
def _generate_refresh_request_headers(self):
|
|
"""Generate the headers that will be used in the refresh request."""
|
|
headers = {
|
|
'content-type': 'application/x-www-form-urlencoded',
|
|
}
|
|
|
|
if self.user_agent is not None:
|
|
headers['user-agent'] = self.user_agent
|
|
|
|
return headers
|
|
|
|
def _refresh(self, http_request):
|
|
"""Refreshes the access_token.
|
|
|
|
This method first checks by reading the Storage object if available.
|
|
If a refresh is still needed, it holds the Storage lock until the
|
|
refresh is completed.
|
|
"""
|
|
if not self.store:
|
|
self._do_refresh_request(http_request)
|
|
else:
|
|
self.store.acquire_lock()
|
|
try:
|
|
new_cred = self.store.locked_get()
|
|
if (new_cred and not new_cred.invalid and
|
|
new_cred.access_token != self.access_token):
|
|
logger.info('Updated access_token read from Storage')
|
|
self._updateFromCredential(new_cred)
|
|
else:
|
|
self._do_refresh_request(http_request)
|
|
finally:
|
|
self.store.release_lock()
|
|
|
|
def _do_refresh_request(self, http_request):
|
|
"""Refresh the access_token using the refresh_token.
|
|
|
|
Args:
|
|
http: An instance of httplib2.Http.request
|
|
or something that acts like it.
|
|
|
|
Raises:
|
|
AccessTokenRefreshError: When the refresh fails.
|
|
"""
|
|
body = self._generate_refresh_request_body()
|
|
headers = self._generate_refresh_request_headers()
|
|
|
|
logger.info('Refresing access_token')
|
|
resp, content = http_request(
|
|
self.token_uri, method='POST', body=body, headers=headers)
|
|
if resp.status == 200:
|
|
# TODO(jcgregorio) Raise an error if loads fails?
|
|
d = simplejson.loads(content)
|
|
self.access_token = d['access_token']
|
|
self.refresh_token = d.get('refresh_token', self.refresh_token)
|
|
if 'expires_in' in d:
|
|
self.token_expiry = datetime.timedelta(
|
|
seconds=int(d['expires_in'])) + datetime.datetime.utcnow()
|
|
else:
|
|
self.token_expiry = None
|
|
if self.store:
|
|
self.store.locked_put(self)
|
|
else:
|
|
# An {'error':...} response body means the token is expired or revoked,
|
|
# so we flag the credentials as such.
|
|
logger.error('Failed to retrieve access token: %s' % content)
|
|
error_msg = 'Invalid response %s.' % resp['status']
|
|
try:
|
|
d = simplejson.loads(content)
|
|
if 'error' in d:
|
|
error_msg = d['error']
|
|
self.invalid = True
|
|
if self.store:
|
|
self.store.locked_put(self)
|
|
except:
|
|
pass
|
|
raise AccessTokenRefreshError(error_msg)
|
|
|
|
def authorize(self, http):
|
|
"""Authorize an httplib2.Http instance with these credentials.
|
|
|
|
Args:
|
|
http: An instance of httplib2.Http
|
|
or something that acts like it.
|
|
|
|
Returns:
|
|
A modified instance of http that was passed in.
|
|
|
|
Example:
|
|
|
|
h = httplib2.Http()
|
|
h = credentials.authorize(h)
|
|
|
|
You can't create a new OAuth subclass of httplib2.Authenication
|
|
because it never gets passed the absolute URI, which is needed for
|
|
signing. So instead we have to overload 'request' with a closure
|
|
that adds in the Authorization header and then calls the original
|
|
version of 'request()'.
|
|
"""
|
|
request_orig = http.request
|
|
|
|
# The closure that will replace 'httplib2.Http.request'.
|
|
def new_request(uri, method='GET', body=None, headers=None,
|
|
redirections=httplib2.DEFAULT_MAX_REDIRECTS,
|
|
connection_type=None):
|
|
if not self.access_token:
|
|
logger.info('Attempting refresh to obtain initial access_token')
|
|
self._refresh(request_orig)
|
|
|
|
# Modify the request headers to add the appropriate
|
|
# Authorization header.
|
|
if headers is None:
|
|
headers = {}
|
|
headers['authorization'] = 'OAuth ' + self.access_token
|
|
|
|
if self.user_agent is not None:
|
|
if 'user-agent' in headers:
|
|
headers['user-agent'] = self.user_agent + ' ' + headers['user-agent']
|
|
else:
|
|
headers['user-agent'] = self.user_agent
|
|
|
|
resp, content = request_orig(uri, method, body, headers,
|
|
redirections, connection_type)
|
|
|
|
if resp.status == 401:
|
|
logger.info('Refreshing due to a 401')
|
|
self._refresh(request_orig)
|
|
headers['authorization'] = 'OAuth ' + self.access_token
|
|
return request_orig(uri, method, body, headers,
|
|
redirections, connection_type)
|
|
else:
|
|
return (resp, content)
|
|
|
|
http.request = new_request
|
|
return http
|
|
|
|
|
|
class AccessTokenCredentials(OAuth2Credentials):
|
|
"""Credentials object for OAuth 2.0.
|
|
|
|
Credentials can be applied to an httplib2.Http object using the
|
|
authorize() method, which then signs each request from that object
|
|
with the OAuth 2.0 access token. This set of credentials is for the
|
|
use case where you have acquired an OAuth 2.0 access_token from
|
|
another place such as a JavaScript client or another web
|
|
application, and wish to use it from Python. Because only the
|
|
access_token is present it can not be refreshed and will in time
|
|
expire.
|
|
|
|
AccessTokenCredentials objects may be safely pickled and unpickled.
|
|
|
|
Usage:
|
|
credentials = AccessTokenCredentials('<an access token>',
|
|
'my-user-agent/1.0')
|
|
http = httplib2.Http()
|
|
http = credentials.authorize(http)
|
|
|
|
Exceptions:
|
|
AccessTokenCredentialsExpired: raised when the access_token expires or is
|
|
revoked.
|
|
"""
|
|
|
|
def __init__(self, access_token, user_agent):
|
|
"""Create an instance of OAuth2Credentials
|
|
|
|
This is one of the few types if Credentials that you should contrust,
|
|
Credentials objects are usually instantiated by a Flow.
|
|
|
|
Args:
|
|
access_token: string, access token.
|
|
user_agent: string, The HTTP User-Agent to provide for this application.
|
|
|
|
Notes:
|
|
store: callable, a callable that when passed a Credential
|
|
will store the credential back to where it came from.
|
|
"""
|
|
super(AccessTokenCredentials, self).__init__(
|
|
access_token,
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
user_agent)
|
|
|
|
|
|
@classmethod
|
|
def from_json(cls, s):
|
|
data = simplejson.loads(s)
|
|
retval = AccessTokenCredentials(
|
|
data['access_token'],
|
|
data['user_agent'])
|
|
return retval
|
|
|
|
def _refresh(self, http_request):
|
|
raise AccessTokenCredentialsError(
|
|
"The access_token is expired or invalid and can't be refreshed.")
|
|
|
|
|
|
class AssertionCredentials(OAuth2Credentials):
|
|
"""Abstract Credentials object used for OAuth 2.0 assertion grants.
|
|
|
|
This credential does not require a flow to instantiate because it
|
|
represents a two legged flow, and therefore has all of the required
|
|
information to generate and refresh its own access tokens. It must
|
|
be subclassed to generate the appropriate assertion string.
|
|
|
|
AssertionCredentials objects may be safely pickled and unpickled.
|
|
"""
|
|
|
|
def __init__(self, assertion_type, user_agent,
|
|
token_uri='https://accounts.google.com/o/oauth2/token',
|
|
**unused_kwargs):
|
|
"""Constructor for AssertionFlowCredentials.
|
|
|
|
Args:
|
|
assertion_type: string, assertion type that will be declared to the auth
|
|
server
|
|
user_agent: string, The HTTP User-Agent to provide for this application.
|
|
token_uri: string, URI for token endpoint. For convenience
|
|
defaults to Google's endpoints but any OAuth 2.0 provider can be used.
|
|
"""
|
|
super(AssertionCredentials, self).__init__(
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
None,
|
|
token_uri,
|
|
user_agent)
|
|
self.assertion_type = assertion_type
|
|
|
|
def _generate_refresh_request_body(self):
|
|
assertion = self._generate_assertion()
|
|
|
|
body = urllib.urlencode({
|
|
'assertion_type': self.assertion_type,
|
|
'assertion': assertion,
|
|
'grant_type': 'assertion',
|
|
})
|
|
|
|
return body
|
|
|
|
def _generate_assertion(self):
|
|
"""Generate the assertion string that will be used in the access token
|
|
request.
|
|
"""
|
|
_abstract()
|
|
|
|
|
|
class OAuth2WebServerFlow(Flow):
|
|
"""Does the Web Server Flow for OAuth 2.0.
|
|
|
|
OAuth2Credentials objects may be safely pickled and unpickled.
|
|
"""
|
|
|
|
def __init__(self, client_id, client_secret, scope, user_agent,
|
|
auth_uri='https://accounts.google.com/o/oauth2/auth',
|
|
token_uri='https://accounts.google.com/o/oauth2/token',
|
|
**kwargs):
|
|
"""Constructor for OAuth2WebServerFlow.
|
|
|
|
Args:
|
|
client_id: string, client identifier.
|
|
client_secret: string client secret.
|
|
scope: string, scope of the credentials being requested.
|
|
user_agent: string, HTTP User-Agent to provide for this application.
|
|
auth_uri: string, URI for authorization endpoint. For convenience
|
|
defaults to Google's endpoints but any OAuth 2.0 provider can be used.
|
|
token_uri: string, URI for token endpoint. For convenience
|
|
defaults to Google's endpoints but any OAuth 2.0 provider can be used.
|
|
**kwargs: dict, The keyword arguments are all optional and required
|
|
parameters for the OAuth calls.
|
|
"""
|
|
self.client_id = client_id
|
|
self.client_secret = client_secret
|
|
self.scope = scope
|
|
self.user_agent = user_agent
|
|
self.auth_uri = auth_uri
|
|
self.token_uri = token_uri
|
|
self.params = kwargs
|
|
self.redirect_uri = None
|
|
|
|
def step1_get_authorize_url(self, redirect_uri='oob'):
|
|
"""Returns a URI to redirect to the provider.
|
|
|
|
Args:
|
|
redirect_uri: string, Either the string 'oob' for a non-web-based
|
|
application, or a URI that handles the callback from
|
|
the authorization server.
|
|
|
|
If redirect_uri is 'oob' then pass in the
|
|
generated verification code to step2_exchange,
|
|
otherwise pass in the query parameters received
|
|
at the callback uri to step2_exchange.
|
|
"""
|
|
|
|
self.redirect_uri = redirect_uri
|
|
query = {
|
|
'response_type': 'code',
|
|
'client_id': self.client_id,
|
|
'redirect_uri': redirect_uri,
|
|
'scope': self.scope,
|
|
}
|
|
query.update(self.params)
|
|
parts = list(urlparse.urlparse(self.auth_uri))
|
|
query.update(dict(parse_qsl(parts[4]))) # 4 is the index of the query part
|
|
parts[4] = urllib.urlencode(query)
|
|
return urlparse.urlunparse(parts)
|
|
|
|
def step2_exchange(self, code, http=None):
|
|
"""Exhanges a code for OAuth2Credentials.
|
|
|
|
Args:
|
|
code: string or dict, either the code as a string, or a dictionary
|
|
of the query parameters to the redirect_uri, which contains
|
|
the code.
|
|
http: httplib2.Http, optional http instance to use to do the fetch
|
|
"""
|
|
|
|
if not (isinstance(code, str) or isinstance(code, unicode)):
|
|
code = code['code']
|
|
|
|
body = urllib.urlencode({
|
|
'grant_type': 'authorization_code',
|
|
'client_id': self.client_id,
|
|
'client_secret': self.client_secret,
|
|
'code': code,
|
|
'redirect_uri': self.redirect_uri,
|
|
'scope': self.scope,
|
|
})
|
|
headers = {
|
|
'content-type': 'application/x-www-form-urlencoded',
|
|
}
|
|
|
|
if self.user_agent is not None:
|
|
headers['user-agent'] = self.user_agent
|
|
|
|
if http is None:
|
|
http = httplib2.Http()
|
|
resp, content = http.request(self.token_uri, method='POST', body=body,
|
|
headers=headers)
|
|
if resp.status == 200:
|
|
# TODO(jcgregorio) Raise an error if simplejson.loads fails?
|
|
d = simplejson.loads(content)
|
|
access_token = d['access_token']
|
|
refresh_token = d.get('refresh_token', None)
|
|
token_expiry = None
|
|
if 'expires_in' in d:
|
|
token_expiry = datetime.datetime.utcnow() + datetime.timedelta(
|
|
seconds=int(d['expires_in']))
|
|
|
|
logger.info('Successfully retrieved access token: %s' % content)
|
|
return OAuth2Credentials(access_token, self.client_id,
|
|
self.client_secret, refresh_token, token_expiry,
|
|
self.token_uri, self.user_agent)
|
|
else:
|
|
logger.error('Failed to retrieve access token: %s' % content)
|
|
error_msg = 'Invalid response %s.' % resp['status']
|
|
try:
|
|
d = simplejson.loads(content)
|
|
if 'error' in d:
|
|
error_msg = d['error']
|
|
except:
|
|
pass
|
|
|
|
raise FlowExchangeError(error_msg)
|