/usr/share/pyshared/oauth2client/gce.py is in python-oauth2client 1.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# 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.
"""Utilities for Google Compute Engine
Utilities for making it easier to use OAuth 2.0 on Google Compute Engine.
"""
__author__ = 'jcgregorio@google.com (Joe Gregorio)'
import httplib2
import logging
import uritemplate
from oauth2client import util
from oauth2client.anyjson import simplejson
from oauth2client.client import AccessTokenRefreshError
from oauth2client.client import AssertionCredentials
logger = logging.getLogger(__name__)
# URI Template for the endpoint that returns access_tokens.
META = ('http://metadata.google.internal/0.1/meta-data/service-accounts/'
'default/acquire{?scope}')
class AppAssertionCredentials(AssertionCredentials):
"""Credentials object for Compute Engine Assertion Grants
This object will allow a Compute Engine instance to identify itself to
Google and other OAuth 2.0 servers that can verify assertions. It can be used
for the purpose of accessing data stored under an account assigned to the
Compute Engine instance itself.
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.
"""
@util.positional(2)
def __init__(self, scope, **kwargs):
"""Constructor for AppAssertionCredentials
Args:
scope: string or iterable of strings, scope(s) of the credentials being
requested.
"""
self.scope = util.scopes_to_string(scope)
# Assertion type is no longer used, but still in the parent class signature.
super(AppAssertionCredentials, self).__init__(None)
@classmethod
def from_json(cls, json):
data = simplejson.loads(json)
return AppAssertionCredentials(data['scope'])
def _refresh(self, http_request):
"""Refreshes the access_token.
Skip all the storage hoops and just refresh using the API.
Args:
http_request: callable, a callable that matches the method signature of
httplib2.Http.request, used to make the refresh request.
Raises:
AccessTokenRefreshError: When the refresh fails.
"""
uri = uritemplate.expand(META, {'scope': self.scope})
response, content = http_request(uri)
if response.status == 200:
try:
d = simplejson.loads(content)
except StandardError, e:
raise AccessTokenRefreshError(str(e))
self.access_token = d['accessToken']
else:
raise AccessTokenRefreshError(content)
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