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# Copyright 2014 Google Inc. All rights reserved.
#
# 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.
"""
import collections
import copy
import datetime
import json
import logging
import os
import shutil
import socket
import sys
import tempfile
import six
from six.moves import http_client
from six.moves import urllib
import oauth2client
from oauth2client import _helpers
from oauth2client import _pkce
from oauth2client import clientsecrets
from oauth2client import transport
HAS_OPENSSL = False
HAS_CRYPTO = False
try:
from oauth2client import crypt
HAS_CRYPTO = True
HAS_OPENSSL = crypt.OpenSSLVerifier is not None
except ImportError: # pragma: NO COVER
pass
logger = logging.getLogger(__name__)
# Expiry is stored in RFC3339 UTC format
EXPIRY_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
# Which certs to use to validate id_tokens received.
ID_TOKEN_VERIFICATION_CERTS = 'https://www.googleapis.com/oauth2/v1/certs'
# This symbol previously had a typo in the name; we keep the old name
# around for now, but will remove it in the future.
ID_TOKEN_VERIFICATON_CERTS = ID_TOKEN_VERIFICATION_CERTS
# Constant to use for the out of band OAuth 2.0 flow.
OOB_CALLBACK_URN = 'urn:ietf:wg:oauth:2.0:oob'
# The value representing user credentials.
AUTHORIZED_USER = 'authorized_user'
# The value representing service account credentials.
SERVICE_ACCOUNT = 'service_account'
# The environment variable pointing the file with local
# Application Default Credentials.
GOOGLE_APPLICATION_CREDENTIALS = 'GOOGLE_APPLICATION_CREDENTIALS'
# The ~/.config subdirectory containing gcloud credentials. Intended
# to be swapped out in tests.
_CLOUDSDK_CONFIG_DIRECTORY = 'gcloud'
# The environment variable name which can replace ~/.config if set.
_CLOUDSDK_CONFIG_ENV_VAR = 'CLOUDSDK_CONFIG'
# The error message we show users when we can't find the Application
# Default Credentials.
ADC_HELP_MSG = (
'The Application Default Credentials are not available. They are '
'available if running in Google Compute Engine. Otherwise, the '
'environment variable ' +
GOOGLE_APPLICATION_CREDENTIALS +
' must be defined pointing to a file defining the credentials. See '
'https://developers.google.com/accounts/docs/'
'application-default-credentials for more information.')
_WELL_KNOWN_CREDENTIALS_FILE = 'application_default_credentials.json'
# The access token along with the seconds in which it expires.
AccessTokenInfo = collections.namedtuple(
'AccessTokenInfo', ['access_token', 'expires_in'])
DEFAULT_ENV_NAME = 'UNKNOWN'
# If set to True _get_environment avoid GCE check (_detect_gce_environment)
NO_GCE_CHECK = os.getenv('NO_GCE_CHECK', 'False')
# Timeout in seconds to wait for the GCE metadata server when detecting the
# GCE environment.
try:
GCE_METADATA_TIMEOUT = int(os.getenv('GCE_METADATA_TIMEOUT', 3))
except ValueError: # pragma: NO COVER
GCE_METADATA_TIMEOUT = 3
_SERVER_SOFTWARE = 'SERVER_SOFTWARE'
_GCE_METADATA_URI = 'http://' + os.getenv('GCE_METADATA_IP', '169.254.169.254')
_METADATA_FLAVOR_HEADER = 'metadata-flavor' # lowercase header
_DESIRED_METADATA_FLAVOR = 'Google'
_GCE_HEADERS = {_METADATA_FLAVOR_HEADER: _DESIRED_METADATA_FLAVOR}
# Expose utcnow() at module level to allow for
# easier testing (by replacing with a stub).
_UTCNOW = datetime.datetime.utcnow
# NOTE: These names were previously defined in this module but have been
# moved into `oauth2client.transport`,
clean_headers = transport.clean_headers
MemoryCache = transport.MemoryCache
REFRESH_STATUS_CODES = transport.REFRESH_STATUS_CODES
class SETTINGS(object):
"""Settings namespace for globally defined values."""
env_name = None
class Error(Exception):
"""Base error for this module."""
class FlowExchangeError(Error):
"""Error trying to exchange an authorization grant for an access token."""
class AccessTokenRefreshError(Error):
"""Error trying to refresh an expired access token."""
class HttpAccessTokenRefreshError(AccessTokenRefreshError):
"""Error (with HTTP status) trying to refresh an expired access token."""
def __init__(self, *args, **kwargs):
super(HttpAccessTokenRefreshError, self).__init__(*args)
self.status = kwargs.get('status')
class TokenRevokeError(Error):
"""Error trying to revoke a token."""
class UnknownClientSecretsFlowError(Error):
"""The client secrets file called for an unknown type of OAuth 2.0 flow."""
class AccessTokenCredentialsError(Error):
"""Having only the access_token means no refresh is possible."""
class VerifyJwtTokenError(Error):
"""Could not retrieve certificates for validation."""
class NonAsciiHeaderError(Error):
"""Header names and values must be ASCII strings."""
class ApplicationDefaultCredentialsError(Error):
"""Error retrieving the Application Default Credentials."""
class OAuth2DeviceCodeError(Error):
"""Error trying to retrieve a device code."""
class CryptoUnavailableError(Error, NotImplementedError):
"""Raised when a crypto library is required, but none is available."""
def _parse_expiry(expiry):
if expiry and isinstance(expiry, datetime.datetime):
return expiry.strftime(EXPIRY_FORMAT)
else:
return None
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 instantiated Credentials object.
"""
NON_SERIALIZED_MEMBERS = frozenset(['store'])
def authorize(self, http):
"""Take an httplib2.Http instance (or equivalent) and authorizes it.
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.
Args:
http: httplib2.Http, an http object to be used to make the refresh
request.
"""
raise NotImplementedError
def refresh(self, http):
"""Forces a refresh of the access_token.
Args:
http: httplib2.Http, an http object to be used to make the refresh
request.
"""
raise NotImplementedError
def revoke(self, http):
"""Revokes a refresh_token and makes the credentials void.
Args:
http: httplib2.Http, an http object to be used to make the revoke
request.
"""
raise NotImplementedError
def apply(self, headers):
"""Add the authorization to the headers.
Args:
headers: dict, the headers to add the Authorization header to.
"""
raise NotImplementedError
def _to_json(self, strip, to_serialize=None):
"""Utility function that creates JSON repr. of a Credentials object.
Args:
strip: array, An array of names of members to exclude from the
JSON.
to_serialize: dict, (Optional) The properties for this object
that will be serialized. This allows callers to
modify before serializing.
Returns:
string, a JSON representation of this instance, suitable to pass to
from_json().
"""
curr_type = self.__class__
if to_serialize is None:
to_serialize = copy.copy(self.__dict__)
else:
# Assumes it is a str->str dictionary, so we don't deep copy.
to_serialize = copy.copy(to_serialize)
for member in strip:
if member in to_serialize:
del to_serialize[member]
to_serialize['token_expiry'] = _parse_expiry(
to_serialize.get('token_expiry'))
# Add in information we will need later to reconstitute this instance.
to_serialize['_class'] = curr_type.__name__
to_serialize['_module'] = curr_type.__module__
for key, val in to_serialize.items():
if isinstance(val, bytes):
to_serialize[key] = val.decode('utf-8')
if isinstance(val, set):
to_serialize[key] = list(val)
return json.dumps(to_serialize)
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(self.NON_SERIALIZED_MEMBERS)
@classmethod
def new_from_json(cls, json_data):
"""Utility class method to instantiate a Credentials subclass from JSON.
Expects the JSON string to have been produced by to_json().
Args:
json_data: string or bytes, JSON from to_json().
Returns:
An instance of the subclass of Credentials that was serialized with
to_json().
"""
json_data_as_unicode = _helpers._from_bytes(json_data)
data = json.loads(json_data_as_unicode)
# Find and call the right classmethod from_json() to restore
# the object.
module_name = data['_module']
try:
module_obj = __import__(module_name)
except ImportError:
# In case there's an object from the old package structure,
# update it
module_name = module_name.replace('.googleapiclient', '')
module_obj = __import__(module_name)
module_obj = __import__(module_name,
fromlist=module_name.split('.')[:-1])
kls = getattr(module_obj, data['_class'])
return kls.from_json(json_data_as_unicode)
@classmethod
def from_json(cls, unused_data):
"""Instantiate a Credentials object from a JSON description of it.
The JSON should have been produced by calling .to_json() on the object.
Args:
unused_data: dict, A deserialized JSON object.
Returns:
An instance of a Credentials subclass.
"""
return Credentials()
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 __init__(self, lock=None):
"""Create a Storage instance.
Args:
lock: An optional threading.Lock-like object. Must implement at
least acquire() and release(). Does not need to be
re-entrant.
"""
self._lock = lock
def acquire_lock(self):
"""Acquires any lock necessary to access this Storage.
This lock is not reentrant.
"""
if self._lock is not None:
self._lock.acquire()
def release_lock(self):
"""Release the Storage lock.
Trying to release a lock that isn't held will result in a
RuntimeError in the case of a threading.Lock or multiprocessing.Lock.
"""
if self._lock is not None:
self._lock.release()
def locked_get(self):
"""Retrieve credential.
The Storage lock must be held when this is called.
Returns:
oauth2client.client.Credentials
"""
raise NotImplementedError
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.
"""
raise NotImplementedError
def locked_delete(self):
"""Delete a credential.
The Storage lock must be held when this is called.
"""
raise NotImplementedError
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()
def delete(self):
"""Delete credential.
Frees any resources associated with storing the credential.
The Storage lock must *not* be held when this is called.
Returns:
None
"""
self.acquire_lock()
try:
return self.locked_delete()
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 adds the OAuth 2.0 access token to each request.
OAuth2Credentials objects may be safely pickled and unpickled.
"""
@_helpers.positional(8)
def __init__(self, access_token, client_id, client_secret, refresh_token,
token_expiry, token_uri, user_agent, revoke_uri=None,
id_token=None, token_response=None, scopes=None,
token_info_uri=None, id_token_jwt=None):
"""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.
revoke_uri: string, URI for revoke endpoint. Defaults to None; a
token can't be revoked if this is None.
id_token: object, The identity of the resource owner.
token_response: dict, the decoded response to the token request.
None if a token hasn't been requested yet. Stored
because some providers (e.g. wordpress.com) include
extra fields that clients may want.
scopes: list, authorized scopes for these credentials.
token_info_uri: string, the URI for the token info endpoint.
Defaults to None; scopes can not be refreshed if
this is None.
id_token_jwt: string, the encoded and signed identity JWT. The
decoded version of this is stored in id_token.
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
self.revoke_uri = revoke_uri
self.id_token = id_token
self.id_token_jwt = id_token_jwt
self.token_response = token_response
self.scopes = set(_helpers.string_to_scopes(scopes or []))
self.token_info_uri = token_info_uri
# True if the credentials have been revoked or expired and can't be
# refreshed.
self.invalid = False
def authorize(self, http):
"""Authorize an httplib2.Http instance with these credentials.
The modified http.request method will add authentication headers to
each request and will refresh access_tokens when a 401 is received on a
request. In addition the http.request method has a credentials
property, http.request.credentials, which is the Credentials object
that authorized it.
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.Authentication
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()'.
"""
transport.wrap_http_for_auth(self, http)
return http
def refresh(self, http):
"""Forces a refresh of the access_token.
Args:
http: httplib2.Http, an http object to be used to make the refresh
request.
"""
self._refresh(http)
def revoke(self, http):
"""Revokes a refresh_token and makes the credentials void.
Args:
http: httplib2.Http, an http object to be used to make the revoke
request.
"""
self._revoke(http)
def apply(self, headers):
"""Add the authorization to the headers.
Args:
headers: dict, the headers to add the Authorization header to.
"""
headers['Authorization'] = 'Bearer ' + self.access_token
def has_scopes(self, scopes):
"""Verify that the credentials are authorized for the given scopes.
Returns True if the credentials authorized scopes contain all of the
scopes given.
Args:
scopes: list or string, the scopes to check.
Notes:
There are cases where the credentials are unaware of which scopes
are authorized. Notably, credentials obtained and stored before
this code was added will not have scopes, AccessTokenCredentials do
not have scopes. In both cases, you can use refresh_scopes() to
obtain the canonical set of scopes.
"""
scopes = _helpers.string_to_scopes(scopes)
return set(scopes).issubset(self.scopes)
def retrieve_scopes(self, http):
"""Retrieves the canonical list of scopes for this access token.
Gets the scopes from the OAuth2 provider.
Args:
http: httplib2.Http, an http object to be used to make the refresh
request.
Returns:
A set of strings containing the canonical list of scopes.
"""
self._retrieve_scopes(http)
return self.scopes
@classmethod
def from_json(cls, json_data):
"""Instantiate a Credentials object from a JSON description of it.
The JSON should have been produced by calling .to_json() on the object.
Args:
json_data: string or bytes, JSON to deserialize.
Returns:
An instance of a Credentials subclass.
"""
data = json.loads(_helpers._from_bytes(json_data))
if (data.get('token_expiry') and
not isinstance(data['token_expiry'], datetime.datetime)):
try:
data['token_expiry'] = datetime.datetime.strptime(
data['token_expiry'], EXPIRY_FORMAT)
except ValueError:
data['token_expiry'] = None
retval = cls(
data['access_token'],
data['client_id'],
data['client_secret'],
data['refresh_token'],
data['token_expiry'],
data['token_uri'],
data['user_agent'],
revoke_uri=data.get('revoke_uri', None),
id_token=data.get('id_token', None),
id_token_jwt=data.get('id_token_jwt', None),
token_response=data.get('token_response', None),
scopes=data.get('scopes', None),
token_info_uri=data.get('token_info_uri', None))
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 = _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 get_access_token(self, http=None):
"""Return the access token and its expiration information.
If the token does not exist, get one.
If the token expired, refresh it.
"""
if not self.access_token or self.access_token_expired:
if not http:
http = transport.get_http_object()
self.refresh(http)
return AccessTokenInfo(access_token=self.access_token,
expires_in=self._expires_in())
def set_store(self, store):
"""Set the Storage for the credential.
Args:
store: Storage, an implementation of Storage 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 _expires_in(self):
"""Return the number of seconds until this token expires.
If token_expiry is in the past, this method will return 0, meaning the
token has already expired.
If token_expiry is None, this method will return None. Note that
returning 0 in such a case would not be fair: the token may still be
valid; we just don't know anything about it.
"""
if self.token_expiry:
now = _UTCNOW()
if self.token_expiry > now:
time_delta = self.token_expiry - now
# TODO(orestica): return time_delta.total_seconds()
# once dropping support for Python 2.6
return time_delta.days * 86400 + time_delta.seconds
else:
return 0
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.parse.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):
"""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.
Args:
http: an object to be used to make HTTP requests.
Raises:
HttpAccessTokenRefreshError: When the refresh fails.
"""
if not self.store:
self._do_refresh_request(http)
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 and
not new_cred.access_token_expired):
logger.info('Updated access_token read from Storage')
self._updateFromCredential(new_cred)
else:
self._do_refresh_request(http)
finally:
self.store.release_lock()
def _do_refresh_request(self, http):
"""Refresh the access_token using the refresh_token.
Args:
http: an object to be used to make HTTP requests.
Raises:
HttpAccessTokenRefreshError: When the refresh fails.
"""
body = self._generate_refresh_request_body()
headers = self._generate_refresh_request_headers()
logger.info('Refreshing access_token')
resp, content = transport.request(
http, self.token_uri, method='POST',
body=body, headers=headers)
content = _helpers._from_bytes(content)
if resp.status == http_client.OK:
d = json.loads(content)
self.token_response = d
self.access_token = d['access_token']
self.refresh_token = d.get('refresh_token', self.refresh_token)
if 'expires_in' in d:
delta = datetime.timedelta(seconds=int(d['expires_in']))
self.token_expiry = delta + _UTCNOW()
else:
self.token_expiry = None
if 'id_token' in d:
self.id_token = _extract_id_token(d['id_token'])
self.id_token_jwt = d['id_token']
else:
self.id_token = None
self.id_token_jwt = None
# On temporary refresh errors, the user does not actually have to
# re-authorize, so we unflag here.
self.invalid = False
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.info('Failed to retrieve access token: %s', content)
error_msg = 'Invalid response {0}.'.format(resp.status)
try:
d = json.loads(content)
if 'error' in d:
error_msg = d['error']
if 'error_description' in d:
error_msg += ': ' + d['error_description']
self.invalid = True
if self.store is not None:
self.store.locked_put(self)
except (TypeError, ValueError):
pass
raise HttpAccessTokenRefreshError(error_msg, status=resp.status)
def _revoke(self, http):
"""Revokes this credential and deletes the stored copy (if it exists).
Args:
http: an object to be used to make HTTP requests.
"""
self._do_revoke(http, self.refresh_token or self.access_token)
def _do_revoke(self, http, token):
"""Revokes this credential and deletes the stored copy (if it exists).
Args:
http: an object to be used to make HTTP requests.
token: A string used as the token to be revoked. Can be either an
access_token or refresh_token.
Raises:
TokenRevokeError: If the revoke request does not return with a
200 OK.
"""
logger.info('Revoking token')
query_params = {'token': token}
token_revoke_uri = _helpers.update_query_params(
self.revoke_uri, query_params)
resp, content = transport.request(http, token_revoke_uri)
if resp.status == http_client.METHOD_NOT_ALLOWED:
body = urllib.parse.urlencode(query_params)
resp, content = transport.request(http, token_revoke_uri,
method='POST', body=body)
if resp.status == http_client.OK:
self.invalid = True
else:
error_msg = 'Invalid response {0}.'.format(resp.status)
try:
d = json.loads(_helpers._from_bytes(content))
if 'error' in d:
error_msg = d['error']
except (TypeError, ValueError):
pass
raise TokenRevokeError(error_msg)
if self.store:
self.store.delete()
def _retrieve_scopes(self, http):
"""Retrieves the list of authorized scopes from the OAuth2 provider.
Args:
http: an object to be used to make HTTP requests.
"""
self._do_retrieve_scopes(http, self.access_token)
def _do_retrieve_scopes(self, http, token):
"""Retrieves the list of authorized scopes from the OAuth2 provider.
Args:
http: an object to be used to make HTTP requests.
token: A string used as the token to identify the credentials to
the provider.
Raises:
Error: When refresh fails, indicating the the access token is
invalid.
"""
logger.info('Refreshing scopes')
query_params = {'access_token': token, 'fields': 'scope'}
token_info_uri = _helpers.update_query_params(
self.token_info_uri, query_params)
resp, content = transport.request(http, token_info_uri)
content = _helpers._from_bytes(content)
if resp.status == http_client.OK:
d = json.loads(content)
self.scopes = set(_helpers.string_to_scopes(d.get('scope', '')))
else:
error_msg = 'Invalid response {0}.'.format(resp.status)
try:
d = json.loads(content)
if 'error_description' in d:
error_msg = d['error_description']
except (TypeError, ValueError):
pass
raise Error(error_msg)
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)
Raises:
AccessTokenCredentialsExpired: raised when the access_token expires or
is revoked.
"""
def __init__(self, access_token, user_agent, revoke_uri=None):
"""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.
revoke_uri: string, URI for revoke endpoint. Defaults to None; a
token can't be revoked if this is None.
"""
super(AccessTokenCredentials, self).__init__(
access_token,
None,
None,
None,
None,
None,
user_agent,
revoke_uri=revoke_uri)
@classmethod
def from_json(cls, json_data):
data = json.loads(_helpers._from_bytes(json_data))
retval = AccessTokenCredentials(
data['access_token'],
data['user_agent'])
return retval
def _refresh(self, http):
"""Refreshes the access token.
Args:
http: unused HTTP object.
Raises:
AccessTokenCredentialsError: always
"""
raise AccessTokenCredentialsError(
'The access_token is expired or invalid and can\'t be refreshed.')
def _revoke(self, http):
"""Revokes the access_token and deletes the store if available.
Args:
http: an object to be used to make HTTP requests.
"""
self._do_revoke(http, self.access_token)
def _detect_gce_environment():
"""Determine if the current environment is Compute Engine.
Returns:
Boolean indicating whether or not the current environment is Google
Compute Engine.
"""
# NOTE: The explicit ``timeout`` is a workaround. The underlying
# issue is that resolving an unknown host on some networks will take
# 20-30 seconds; making this timeout short fixes the issue, but
# could lead to false negatives in the event that we are on GCE, but
# the metadata resolution was particularly slow. The latter case is
# "unlikely".
http = transport.get_http_object(timeout=GCE_METADATA_TIMEOUT)
try:
response, _ = transport.request(
http, _GCE_METADATA_URI, headers=_GCE_HEADERS)
return (