diff --git a/third_party/google_api_python_client/MODIFICATIONS.diff b/third_party/google_api_python_client/MODIFICATIONS.diff
new file mode 100644
index 0000000..efa382a
--- /dev/null
+++ b/third_party/google_api_python_client/MODIFICATIONS.diff
@@ -0,0 +1,125 @@
+diff --git a/third_party/google_api_python_client/apiclient/__init__.py b/third_party/google_api_python_client/apiclient/__init__.py
+index 5efb142..acb1a23 100644
+--- a/third_party/google_api_python_client/apiclient/__init__.py
++++ b/third_party/google_api_python_client/apiclient/__init__.py
+@@ -3,7 +3,7 @@
+ import googleapiclient
+ 
+ try:
+-  import oauth2client
++  from third_party import oauth2client
+ except ImportError:
+   raise RuntimeError(
+       'Previous version of google-api-python-client detected; due to a '
+diff --git a/third_party/google_api_python_client/googleapiclient/channel.py b/third_party/google_api_python_client/googleapiclient/channel.py
+index 68a3b89..4626094 100644
+--- a/third_party/google_api_python_client/googleapiclient/channel.py
++++ b/third_party/google_api_python_client/googleapiclient/channel.py
+@@ -60,7 +60,7 @@ import datetime
+ import uuid
+ 
+ from googleapiclient import errors
+-from ...oauth2client import util
++from third_party.oauth2client import util
+ 
+ 
+ # The unix time epoch starts at midnight 1970.
+diff --git a/third_party/google_api_python_client/googleapiclient/discovery.py b/third_party/google_api_python_client/googleapiclient/discovery.py
+index 3ddac57..0e9e5cf 100644
+--- a/third_party/google_api_python_client/googleapiclient/discovery.py
++++ b/third_party/google_api_python_client/googleapiclient/discovery.py
+@@ -47,9 +47,9 @@ except ImportError:
+   from cgi import parse_qsl
+ 
+ # Third-party imports
+-from ... import httplib2
++from third_party import httplib2
++from third_party.uritemplate import uritemplate
+ import mimeparse
+-from ... import uritemplate
+ 
+ # Local imports
+ from googleapiclient.errors import HttpError
+@@ -65,9 +65,9 @@ from googleapiclient.model import JsonModel
+ from googleapiclient.model import MediaModel
+ from googleapiclient.model import RawModel
+ from googleapiclient.schema import Schemas
+-from oauth2client.client import GoogleCredentials
+-from oauth2client.util import _add_query_parameter
+-from oauth2client.util import positional
++from third_party.oauth2client.client import GoogleCredentials
++from third_party.oauth2client.util import _add_query_parameter
++from third_party.oauth2client.util import positional
+ 
+ 
+ # The client library requires a version of httplib2 that supports RETRIES.
+diff --git a/third_party/google_api_python_client/googleapiclient/errors.py b/third_party/google_api_python_client/googleapiclient/errors.py
+index a1999fd..18c52e6 100644
+--- a/third_party/google_api_python_client/googleapiclient/errors.py
++++ b/third_party/google_api_python_client/googleapiclient/errors.py
+@@ -24,7 +24,7 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
+ 
+ import json
+ 
+-from ...oauth2client import util
++from third_party.oauth2client import util
+ 
+ 
+ class Error(Exception):
+diff --git a/third_party/google_api_python_client/googleapiclient/http.py b/third_party/google_api_python_client/googleapiclient/http.py
+index 8638279..d2ce70c 100644
+--- a/third_party/google_api_python_client/googleapiclient/http.py
++++ b/third_party/google_api_python_client/googleapiclient/http.py
+@@ -25,7 +25,6 @@ import StringIO
+ import base64
+ import copy
+ import gzip
+-import httplib2
+ import json
+ import logging
+ import mimeparse
+@@ -49,7 +48,8 @@ from errors import ResumableUploadError
+ from errors import UnexpectedBodyError
+ from errors import UnexpectedMethodError
+ from model import JsonModel
+-from ...oauth2client import util
++from third_party import httplib2
++from third_party.oauth2client import util
+ 
+ 
+ DEFAULT_CHUNK_SIZE = 512*1024
+diff --git a/third_party/google_api_python_client/googleapiclient/sample_tools.py b/third_party/google_api_python_client/googleapiclient/sample_tools.py
+index cbd6d6f..cc0790b 100644
+--- a/third_party/google_api_python_client/googleapiclient/sample_tools.py
++++ b/third_party/google_api_python_client/googleapiclient/sample_tools.py
+@@ -22,13 +22,13 @@ __all__ = ['init']
+ 
+ 
+ import argparse
+-import httplib2
+ import os
+ 
+ from googleapiclient import discovery
+-from ...oauth2client import client
+-from ...oauth2client import file
+-from ...oauth2client import tools
++from third_party import httplib2
++from third_party.oauth2client import client
++from third_party.oauth2client import file
++from third_party.oauth2client import tools
+ 
+ 
+ def init(argv, name, version, doc, filename, scope=None, parents=[], discovery_filename=None):
+diff --git a/third_party/google_api_python_client/googleapiclient/schema.py b/third_party/google_api_python_client/googleapiclient/schema.py
+index af41317..92543ec 100644
+--- a/third_party/google_api_python_client/googleapiclient/schema.py
++++ b/third_party/google_api_python_client/googleapiclient/schema.py
+@@ -63,7 +63,7 @@ __author__ = 'jcgregorio@google.com (Joe Gregorio)'
+ 
+ import copy
+ 
+-from oauth2client import util
++from third_party.oauth2client import util
+ 
+ 
+ class Schemas(object):
diff --git a/third_party/google_api_python_client/README.chromium b/third_party/google_api_python_client/README.chromium
index eb7a00d..a7e9583 100644
--- a/third_party/google_api_python_client/README.chromium
+++ b/third_party/google_api_python_client/README.chromium
@@ -3,4 +3,8 @@
 Revision: 49d45a6c3318b75e551c3022020f46c78655f365
 License: Apache License, Version 2.0 (the "License")
 
-No local changes
+Local modifications:
+See also MODIFICATIONS.diff
+
+Notes:
+Requires the httplib2 and oauth2client library.
diff --git a/third_party/google_api_python_client/apiclient/__init__.py b/third_party/google_api_python_client/apiclient/__init__.py
index 5efb142..acb1a23 100644
--- a/third_party/google_api_python_client/apiclient/__init__.py
+++ b/third_party/google_api_python_client/apiclient/__init__.py
@@ -3,7 +3,7 @@
 import googleapiclient
 
 try:
-  import oauth2client
+  from third_party import oauth2client
 except ImportError:
   raise RuntimeError(
       'Previous version of google-api-python-client detected; due to a '
diff --git a/third_party/google_api_python_client/googleapiclient/channel.py b/third_party/google_api_python_client/googleapiclient/channel.py
index 68a3b89..4626094 100644
--- a/third_party/google_api_python_client/googleapiclient/channel.py
+++ b/third_party/google_api_python_client/googleapiclient/channel.py
@@ -60,7 +60,7 @@
 import uuid
 
 from googleapiclient import errors
-from ...oauth2client import util
+from third_party.oauth2client import util
 
 
 # The unix time epoch starts at midnight 1970.
diff --git a/third_party/google_api_python_client/googleapiclient/discovery.py b/third_party/google_api_python_client/googleapiclient/discovery.py
index 3ddac57..0e9e5cf 100644
--- a/third_party/google_api_python_client/googleapiclient/discovery.py
+++ b/third_party/google_api_python_client/googleapiclient/discovery.py
@@ -47,9 +47,9 @@
   from cgi import parse_qsl
 
 # Third-party imports
-from ... import httplib2
+from third_party import httplib2
+from third_party.uritemplate import uritemplate
 import mimeparse
-from ... import uritemplate
 
 # Local imports
 from googleapiclient.errors import HttpError
@@ -65,9 +65,9 @@
 from googleapiclient.model import MediaModel
 from googleapiclient.model import RawModel
 from googleapiclient.schema import Schemas
-from oauth2client.client import GoogleCredentials
-from oauth2client.util import _add_query_parameter
-from oauth2client.util import positional
+from third_party.oauth2client.client import GoogleCredentials
+from third_party.oauth2client.util import _add_query_parameter
+from third_party.oauth2client.util import positional
 
 
 # The client library requires a version of httplib2 that supports RETRIES.
diff --git a/third_party/google_api_python_client/googleapiclient/errors.py b/third_party/google_api_python_client/googleapiclient/errors.py
index a1999fd..18c52e6 100644
--- a/third_party/google_api_python_client/googleapiclient/errors.py
+++ b/third_party/google_api_python_client/googleapiclient/errors.py
@@ -24,7 +24,7 @@
 
 import json
 
-from ...oauth2client import util
+from third_party.oauth2client import util
 
 
 class Error(Exception):
diff --git a/third_party/google_api_python_client/googleapiclient/http.py b/third_party/google_api_python_client/googleapiclient/http.py
index 8638279..d2ce70c 100644
--- a/third_party/google_api_python_client/googleapiclient/http.py
+++ b/third_party/google_api_python_client/googleapiclient/http.py
@@ -25,7 +25,6 @@
 import base64
 import copy
 import gzip
-import httplib2
 import json
 import logging
 import mimeparse
@@ -49,7 +48,8 @@
 from errors import UnexpectedBodyError
 from errors import UnexpectedMethodError
 from model import JsonModel
-from ...oauth2client import util
+from third_party import httplib2
+from third_party.oauth2client import util
 
 
 DEFAULT_CHUNK_SIZE = 512*1024
diff --git a/third_party/google_api_python_client/googleapiclient/sample_tools.py b/third_party/google_api_python_client/googleapiclient/sample_tools.py
index cbd6d6f..cc0790b 100644
--- a/third_party/google_api_python_client/googleapiclient/sample_tools.py
+++ b/third_party/google_api_python_client/googleapiclient/sample_tools.py
@@ -22,13 +22,13 @@
 
 
 import argparse
-import httplib2
 import os
 
 from googleapiclient import discovery
-from ...oauth2client import client
-from ...oauth2client import file
-from ...oauth2client import tools
+from third_party import httplib2
+from third_party.oauth2client import client
+from third_party.oauth2client import file
+from third_party.oauth2client import tools
 
 
 def init(argv, name, version, doc, filename, scope=None, parents=[], discovery_filename=None):
diff --git a/third_party/google_api_python_client/googleapiclient/schema.py b/third_party/google_api_python_client/googleapiclient/schema.py
index af41317..92543ec 100644
--- a/third_party/google_api_python_client/googleapiclient/schema.py
+++ b/third_party/google_api_python_client/googleapiclient/schema.py
@@ -63,7 +63,7 @@
 
 import copy
 
-from oauth2client import util
+from third_party.oauth2client import util
 
 
 class Schemas(object):
diff --git a/third_party/oauth2client/README.chromium b/third_party/oauth2client/README.chromium
index ea15b96..bfc4a01 100644
--- a/third_party/oauth2client/README.chromium
+++ b/third_party/oauth2client/README.chromium
@@ -1,7 +1,7 @@
 Name: oauth2client
 Short Name: oauth2client
-URL: https://pypi.python.org/packages/source/o/oauth2client/oauth2client-1.2.tar.gz
-Version: 1.2
+URL: https://pypi.python.org/packages/source/o/oauth2client/oauth2client-1.4.7.tar.gz
+Version: 1.4.7
 License: Apache License 2.0
 
 Description:
diff --git a/third_party/oauth2client/__init__.py b/third_party/oauth2client/__init__.py
index ac84748..fea30ca 100644
--- a/third_party/oauth2client/__init__.py
+++ b/third_party/oauth2client/__init__.py
@@ -1,5 +1,8 @@
-__version__ = "1.2"
+"""Client library for using OAuth2, especially with Google APIs."""
+
+__version__ = '1.4.7'
 
 GOOGLE_AUTH_URI = 'https://accounts.google.com/o/oauth2/auth'
+GOOGLE_DEVICE_URI = 'https://accounts.google.com/o/oauth2/device/code'
 GOOGLE_REVOKE_URI = 'https://accounts.google.com/o/oauth2/revoke'
-GOOGLE_TOKEN_URI = 'https://accounts.google.com/o/oauth2/token'
+GOOGLE_TOKEN_URI = 'https://accounts.google.com/o/oauth2/token'
\ No newline at end of file
diff --git a/third_party/oauth2client/anyjson.py b/third_party/oauth2client/anyjson.py
deleted file mode 100644
index ae21c33..0000000
--- a/third_party/oauth2client/anyjson.py
+++ /dev/null
@@ -1,32 +0,0 @@
-# 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.
-
-"""Utility module to import a JSON module
-
-Hides all the messy details of exactly where
-we get a simplejson module from.
-"""
-
-__author__ = 'jcgregorio@google.com (Joe Gregorio)'
-
-
-try: # pragma: no cover
-  # Should work for Python2.6 and higher.
-  import json as simplejson
-except ImportError: # pragma: no cover
-  try:
-    import simplejson
-  except ImportError:
-    # Try to import from django, should work on App Engine
-    from django.utils import simplejson
diff --git a/third_party/oauth2client/appengine.py b/third_party/oauth2client/appengine.py
index 5cd3f4b..4131513 100644
--- a/third_party/oauth2client/appengine.py
+++ b/third_party/oauth2client/appengine.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2010 Google Inc.
+# 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.
@@ -19,14 +19,14 @@
 
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
-import base64
 import cgi
-import httplib2
+import json
 import logging
 import os
 import pickle
 import threading
-import time
+
+import httplib2
 
 from google.appengine.api import app_identity
 from google.appengine.api import memcache
@@ -41,7 +41,6 @@
 from oauth2client import clientsecrets
 from oauth2client import util
 from oauth2client import xsrfutil
-from oauth2client.anyjson import simplejson
 from oauth2client.client import AccessTokenRefreshError
 from oauth2client.client import AssertionCredentials
 from oauth2client.client import Credentials
@@ -159,15 +158,20 @@
     Args:
       scope: string or iterable of strings, scope(s) of the credentials being
         requested.
+      **kwargs: optional keyword args, including:
+        service_account_id: service account id of the application. If None or
+          unspecified, the default service account for the app is used.
     """
     self.scope = util.scopes_to_string(scope)
+    self._kwargs = kwargs
+    self.service_account_id = kwargs.get('service_account_id', None)
 
     # 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)
+  def from_json(cls, json_data):
+    data = json.loads(json_data)
     return AppAssertionCredentials(data['scope'])
 
   def _refresh(self, http_request):
@@ -186,11 +190,22 @@
     """
     try:
       scopes = self.scope.split()
-      (token, _) = app_identity.get_access_token(scopes)
-    except app_identity.Error, e:
+      (token, _) = app_identity.get_access_token(
+          scopes, service_account_id=self.service_account_id)
+    except app_identity.Error as e:
       raise AccessTokenRefreshError(str(e))
     self.access_token = token
 
+  @property
+  def serialization_data(self):
+    raise NotImplementedError('Cannot serialize credentials for AppEngine.')
+
+  def create_scoped_required(self):
+    return not self.scope
+
+  def create_scoped(self, scopes):
+    return AppAssertionCredentials(scopes, **self._kwargs)
+
 
 class FlowProperty(db.Property):
   """App Engine datastore Property for Flow.
@@ -434,6 +449,7 @@
       entity_key = db.Key.from_path(self._model.kind(), self._key_name)
       db.delete(entity_key)
 
+  @db.non_transactional(allow_existing=True)
   def locked_get(self):
     """Retrieve Credential from datastore.
 
@@ -456,6 +472,7 @@
       credentials.set_store(self)
     return credentials
 
+  @db.non_transactional(allow_existing=True)
   def locked_put(self, credentials):
     """Write a Credentials to the datastore.
 
@@ -468,6 +485,7 @@
     if self._cache:
       self._cache.set(self._key_name, credentials.to_json())
 
+  @db.non_transactional(allow_existing=True)
   def locked_delete(self):
     """Delete Credential from datastore."""
 
@@ -553,16 +571,14 @@
   Instantiate and then use with oauth_required or oauth_aware
   as decorators on webapp.RequestHandler methods.
 
-  Example:
+  ::
 
     decorator = OAuth2Decorator(
         client_id='837...ent.com',
         client_secret='Qh...wwI',
         scope='https://www.googleapis.com/auth/plus')
 
-
     class MainHandler(webapp.RequestHandler):
-
       @decorator.oauth_required
       def get(self):
         http = decorator.http()
@@ -650,8 +666,9 @@
         provided to this constructor. A string indicating the name of the field
         on the _credentials_class where a Credentials object will be stored.
         Defaults to 'credentials'.
-      **kwargs: dict, Keyword arguments are be passed along as kwargs to the
-        OAuth2WebServerFlow constructor.
+      **kwargs: dict, Keyword arguments are passed along as kwargs to
+        the OAuth2WebServerFlow constructor.
+
     """
     self._tls = threading.local()
     self.flow = None
@@ -798,14 +815,18 @@
     url = self.flow.step1_get_authorize_url()
     return str(url)
 
-  def http(self):
+  def http(self, *args, **kwargs):
     """Returns an authorized http instance.
 
     Must only be called from within an @oauth_required decorated method, or
     from within an @oauth_aware decorated method where has_credentials()
     returns True.
+
+    Args:
+        *args: Positional arguments passed to httplib2.Http constructor.
+        **kwargs: Positional arguments passed to httplib2.Http constructor.
     """
-    return self.credentials.authorize(httplib2.Http())
+    return self.credentials.authorize(httplib2.Http(*args, **kwargs))
 
   @property
   def callback_path(self):
@@ -824,7 +845,8 @@
   def callback_handler(self):
     """RequestHandler for the OAuth 2.0 redirect callback.
 
-    Usage:
+    Usage::
+
        app = webapp.WSGIApplication([
          ('/index', MyIndexHandler),
          ...,
@@ -858,7 +880,7 @@
                                             user)
 
           if decorator._token_response_param and credentials.token_response:
-            resp_json = simplejson.dumps(credentials.token_response)
+            resp_json = json.dumps(credentials.token_response)
             redirect_uri = util._add_query_parameter(
                 redirect_uri, decorator._token_response_param, resp_json)
 
@@ -887,24 +909,23 @@
   Uses a clientsecrets file as the source for all the information when
   constructing an OAuth2Decorator.
 
-  Example:
+  ::
 
     decorator = OAuth2DecoratorFromClientSecrets(
       os.path.join(os.path.dirname(__file__), 'client_secrets.json')
       scope='https://www.googleapis.com/auth/plus')
 
-
     class MainHandler(webapp.RequestHandler):
-
       @decorator.oauth_required
       def get(self):
         http = decorator.http()
         # http is authorized with the user's Credentials and can be used
         # in API calls
+
   """
 
   @util.positional(3)
-  def __init__(self, filename, scope, message=None, cache=None):
+  def __init__(self, filename, scope, message=None, cache=None, **kwargs):
     """Constructor
 
     Args:
@@ -917,17 +938,20 @@
         decorator.
       cache: An optional cache service client that implements get() and set()
         methods. See clientsecrets.loadfile() for details.
+      **kwargs: dict, Keyword arguments are passed along as kwargs to
+        the OAuth2WebServerFlow constructor.
     """
     client_type, client_info = clientsecrets.loadfile(filename, cache=cache)
     if client_type not in [
         clientsecrets.TYPE_WEB, clientsecrets.TYPE_INSTALLED]:
       raise InvalidClientSecretsError(
-          'OAuth2Decorator doesn\'t support this OAuth 2.0 flow.')
-    constructor_kwargs = {
-      'auth_uri': client_info['auth_uri'],
-      'token_uri': client_info['token_uri'],
-      'message': message,
-    }
+          "OAuth2Decorator doesn't support this OAuth 2.0 flow.")
+    constructor_kwargs = dict(kwargs)
+    constructor_kwargs.update({
+        'auth_uri': client_info['auth_uri'],
+        'token_uri': client_info['token_uri'],
+        'message': message,
+    })
     revoke_uri = client_info.get('revoke_uri')
     if revoke_uri is not None:
       constructor_kwargs['revoke_uri'] = revoke_uri
@@ -960,4 +984,4 @@
 
   """
   return OAuth2DecoratorFromClientSecrets(filename, scope,
-                                          message=message, cache=cache)
+                                          message=message, cache=cache)
\ No newline at end of file
diff --git a/third_party/oauth2client/client.py b/third_party/oauth2client/client.py
index 6901f3f..8fe28a3 100644
--- a/third_party/oauth2client/client.py
+++ b/third_party/oauth2client/client.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2010 Google Inc.
+# 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.
@@ -20,44 +20,48 @@
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 import base64
-import clientsecrets
+import collections
 import copy
 import datetime
-from .. import httplib2
+import json
 import logging
+import os
+import socket
 import sys
+import tempfile
 import time
-import urllib
-import urlparse
+import shutil
 
+from .. import httplib2
+from . import clientsecrets
 from . import GOOGLE_AUTH_URI
+from . import GOOGLE_DEVICE_URI
 from . import GOOGLE_REVOKE_URI
 from . import GOOGLE_TOKEN_URI
 from . import util
-from .anyjson import simplejson
+from third_party import six
+from third_party.six.moves import urllib
 
 HAS_OPENSSL = False
 HAS_CRYPTO = False
 try:
-  from . import crypt
+  from oauth2client import crypt
   HAS_CRYPTO = True
   if crypt.OpenSSLVerifier is not None:
     HAS_OPENSSL = True
 except ImportError:
   pass
 
-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:%SZ'
 
 # Which certs to use to validate id_tokens received.
-ID_TOKEN_VERIFICATON_CERTS = 'https://www.googleapis.com/oauth2/v1/certs'
+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'
@@ -65,6 +69,42 @@
 # Google Data client libraries may need to set this to [401, 403].
 REFRESH_STATUS_CODES = [401]
 
+# 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 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'  # pylint:disable=line-too-long
+    ' for more information.')
+
+# 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.environ.setdefault('NO_GCE_CHECK', 'False')
+
+class SETTINGS(object):
+  """Settings namespace for globally defined values."""
+  env_name = None
+
 
 class Error(Exception):
   """Base error for this module."""
@@ -91,13 +131,25 @@
 
 
 class VerifyJwtTokenError(Error):
-  """Could on retrieve certificates for validation."""
+  """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 _abstract():
   raise NotImplementedError('You need to override this function')
 
@@ -125,11 +177,12 @@
   an HTTP transport.
 
   Subclasses must also specify a classmethod named 'from_json' that takes a JSON
-  string as input and returns an instaniated Credentials object.
+  string as input and returns an instantiated Credentials object.
   """
 
   NON_SERIALIZED_MEMBERS = ['store']
 
+
   def authorize(self, http):
     """Take an httplib2.Http instance (or equivalent) and authorizes it.
 
@@ -143,6 +196,7 @@
     """
     _abstract()
 
+
   def refresh(self, http):
     """Forces a refresh of the access_token.
 
@@ -152,6 +206,7 @@
     """
     _abstract()
 
+
   def revoke(self, http):
     """Revokes a refresh_token and makes the credentials void.
 
@@ -161,6 +216,7 @@
     """
     _abstract()
 
+
   def apply(self, headers):
     """Add the authorization to the headers.
 
@@ -184,12 +240,16 @@
     for member in strip:
       if member in d:
         del d[member]
-    if 'token_expiry' in d and isinstance(d['token_expiry'], datetime.datetime):
+    if (d.get('token_expiry') 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)
+    for key, val in d.items():
+      if isinstance(val, bytes):
+        d[key] = val.decode('utf-8')
+    return json.dumps(d)
 
   def to_json(self):
     """Creating a JSON representation of an instance of Credentials.
@@ -212,14 +272,16 @@
       An instance of the subclass of Credentials that was serialized with
       to_json().
     """
-    data = simplejson.loads(s)
+    if six.PY3 and isinstance(s, bytes):
+      s = s.decode('utf-8')
+    data = json.loads(s)
     # Find and call the right classmethod from_json() to restore the object.
     module = data['_module']
     try:
       m = __import__(module)
     except ImportError:
       # In case there's an object from the old package structure, update it
-      module = module.replace('.apiclient', '')
+      module = module.replace('.googleapiclient', '')
       m = __import__(module)
 
     m = __import__(module, fromlist=module.split('.')[:-1])
@@ -228,13 +290,13 @@
     return from_json(s)
 
   @classmethod
-  def from_json(cls, s):
+  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:
-      data: dict, A deserialized JSON object.
+      unused_data: dict, A deserialized JSON object.
 
     Returns:
       An instance of a Credentials subclass.
@@ -356,8 +418,10 @@
   """
   clean = {}
   try:
-    for k, v in headers.iteritems():
-      clean[str(k)] = str(v)
+    for k, v in six.iteritems(headers):
+      clean_k = k if isinstance(k, bytes) else str(k).encode('ascii')
+      clean_v = v if isinstance(v, bytes) else str(v).encode('ascii')
+      clean[clean_k] = clean_v
   except UnicodeEncodeError:
     raise NonAsciiHeaderError(k + ': ' + v)
   return clean
@@ -373,11 +437,11 @@
   Returns:
     The same URI but with the new query parameters added.
   """
-  parts = list(urlparse.urlparse(uri))
-  query_params = dict(parse_qsl(parts[4])) # 4 is the index of the query part
+  parts = urllib.parse.urlparse(uri)
+  query_params = dict(urllib.parse.parse_qsl(parts.query))
   query_params.update(params)
-  parts[4] = urllib.urlencode(query_params)
-  return urlparse.urlunparse(parts)
+  new_parts = parts._replace(query=urllib.parse.urlencode(query_params))
+  return urllib.parse.urlunparse(new_parts)
 
 
 class OAuth2Credentials(Credentials):
@@ -445,22 +509,23 @@
     it.
 
     Args:
-       http: An instance of httplib2.Http
-         or something that acts like it.
+       http: An instance of ``httplib2.Http`` or something that acts
+         like it.
 
     Returns:
        A modified instance of http that was passed in.
 
-    Example:
+    Example::
 
       h = httplib2.Http()
       h = credentials.authorize(h)
 
-    You can't create a new OAuth subclass of httplib2.Authenication
+    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()'.
+
     """
     request_orig = http.request
 
@@ -473,10 +538,12 @@
         logger.info('Attempting refresh to obtain initial access_token')
         self._refresh(request_orig)
 
-      # Modify the request headers to add the appropriate
+      # Clone and modify the request headers to add the appropriate
       # Authorization header.
       if headers is None:
         headers = {}
+      else:
+        headers = dict(headers)
       self.apply(headers)
 
       if self.user_agent is not None:
@@ -489,7 +556,7 @@
                                    redirections, connection_type)
 
       if resp.status in REFRESH_STATUS_CODES:
-        logger.info('Refreshing due to a %s' % str(resp.status))
+        logger.info('Refreshing due to a %s', resp.status)
         self._refresh(request_orig)
         self.apply(headers)
         return request_orig(uri, method, body, clean_headers(headers),
@@ -545,13 +612,15 @@
     Returns:
       An instance of a Credentials subclass.
     """
-    data = simplejson.loads(s)
-    if 'token_expiry' in data and not isinstance(data['token_expiry'],
-        datetime.datetime):
+    if six.PY3 and isinstance(s, bytes):
+      s = s.decode('utf-8')
+    data = json.loads(s)
+    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:
+      except ValueError:
         data['token_expiry'] = None
     retval = cls(
         data['access_token'],
@@ -586,11 +655,24 @@
       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 = httplib2.Http()
+      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 Stroage object.
+      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
@@ -598,6 +680,25 @@
     """
     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 = datetime.datetime.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__())
@@ -615,7 +716,7 @@
 
   def _generate_refresh_request_body(self):
     """Generate the body that will be used in the refresh request."""
-    body = urllib.urlencode({
+    body = urllib.parse.urlencode({
         'grant_type': 'refresh_token',
         'client_id': self.client_id,
         'client_secret': self.client_secret,
@@ -679,9 +780,10 @@
     logger.info('Refreshing access_token')
     resp, content = http_request(
         self.token_uri, method='POST', body=body, headers=headers)
+    if six.PY3 and isinstance(content, bytes):
+      content = content.decode('utf-8')
     if resp.status == 200:
-      # TODO(jcgregorio) Raise an error if loads fails?
-      d = simplejson.loads(content)
+      d = json.loads(content)
       self.token_response = d
       self.access_token = d['access_token']
       self.refresh_token = d.get('refresh_token', self.refresh_token)
@@ -690,35 +792,40 @@
             seconds=int(d['expires_in'])) + datetime.datetime.utcnow()
       else:
         self.token_expiry = 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)
+      logger.info('Failed to retrieve access token: %s', content)
       error_msg = 'Invalid response %s.' % resp['status']
       try:
-        d = simplejson.loads(content)
+        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:
             self.store.locked_put(self)
-      except StandardError:
+      except (TypeError, ValueError):
         pass
       raise AccessTokenRefreshError(error_msg)
 
   def _revoke(self, http_request):
-    """Revokes the refresh_token and deletes the store if available.
+    """Revokes this credential and deletes the stored copy (if it exists).
 
     Args:
       http_request: callable, a callable that matches the method signature of
         httplib2.Http.request, used to make the revoke request.
     """
-    self._do_revoke(http_request, self.refresh_token)
+    self._do_revoke(http_request, self.refresh_token or self.access_token)
 
   def _do_revoke(self, http_request, token):
-    """Revokes the credentials and deletes the store if available.
+    """Revokes this credential and deletes the stored copy (if it exists).
 
     Args:
       http_request: callable, a callable that matches the method signature of
@@ -738,10 +845,10 @@
     else:
       error_msg = 'Invalid response %s.' % resp.status
       try:
-        d = simplejson.loads(content)
+        d = json.loads(content)
         if 'error' in d:
           error_msg = d['error']
-      except StandardError:
+      except (TypeError, ValueError):
         pass
       raise TokenRevokeError(error_msg)
 
@@ -763,7 +870,8 @@
 
   AccessTokenCredentials objects may be safely pickled and unpickled.
 
-  Usage:
+  Usage::
+
     credentials = AccessTokenCredentials('<an access token>',
       'my-user-agent/1.0')
     http = httplib2.Http()
@@ -799,10 +907,12 @@
 
   @classmethod
   def from_json(cls, s):
-    data = simplejson.loads(s)
+    if six.PY3 and isinstance(s, bytes):
+      s = s.decode('utf-8')
+    data = json.loads(s)
     retval = AccessTokenCredentials(
-        data['access_token'],
-        data['user_agent'])
+      data['access_token'],
+      data['user_agent'])
     return retval
 
   def _refresh(self, http_request):
@@ -819,7 +929,434 @@
     self._do_revoke(http_request, self.access_token)
 
 
-class AssertionCredentials(OAuth2Credentials):
+def _detect_gce_environment(urlopen=None):
+  """Determine if the current environment is Compute Engine.
+
+  Args:
+      urlopen: Optional argument. Function used to open a connection to a URL.
+
+  Returns:
+      Boolean indicating whether or not the current environment is Google
+          Compute Engine.
+  """
+  urlopen = urlopen or urllib.request.urlopen
+  # Note: the explicit `timeout` below 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".
+  try:
+    response = urlopen('http://169.254.169.254/', timeout=1)
+    return response.info().get('Metadata-Flavor', '') == 'Google'
+  except socket.timeout:
+    logger.info('Timeout attempting to reach GCE metadata service.')
+    return False
+  except urllib.error.URLError as e:
+    if isinstance(getattr(e, 'reason', None), socket.timeout):
+      logger.info('Timeout attempting to reach GCE metadata service.')
+    return False
+
+
+def _get_environment(urlopen=None):
+  """Detect the environment the code is being run on.
+
+  Args:
+      urlopen: Optional argument. Function used to open a connection to a URL.
+
+  Returns:
+      The value of SETTINGS.env_name after being set. If already
+          set, simply returns the value.
+  """
+  if SETTINGS.env_name is not None:
+    return SETTINGS.env_name
+
+  # None is an unset value, not the default.
+  SETTINGS.env_name = DEFAULT_ENV_NAME
+
+  server_software = os.environ.get('SERVER_SOFTWARE', '')
+  if server_software.startswith('Google App Engine/'):
+    SETTINGS.env_name = 'GAE_PRODUCTION'
+  elif server_software.startswith('Development/'):
+    SETTINGS.env_name = 'GAE_LOCAL'
+  elif NO_GCE_CHECK != 'True' and _detect_gce_environment(urlopen=urlopen):
+    SETTINGS.env_name = 'GCE_PRODUCTION'
+
+  return SETTINGS.env_name
+
+
+class GoogleCredentials(OAuth2Credentials):
+  """Application Default Credentials for use in calling Google APIs.
+
+  The Application Default Credentials are being constructed as a function of
+  the environment where the code is being run.
+  More details can be found on this page:
+  https://developers.google.com/accounts/docs/application-default-credentials
+
+  Here is an example of how to use the Application Default Credentials for a
+  service that requires authentication:
+
+      from googleapiclient.discovery import build
+      from oauth2client.client import GoogleCredentials
+
+      credentials = GoogleCredentials.get_application_default()
+      service = build('compute', 'v1', credentials=credentials)
+
+      PROJECT = 'bamboo-machine-422'
+      ZONE = 'us-central1-a'
+      request = service.instances().list(project=PROJECT, zone=ZONE)
+      response = request.execute()
+
+      print(response)
+ """
+
+  def __init__(self, access_token, client_id, client_secret, refresh_token,
+               token_expiry, token_uri, user_agent,
+               revoke_uri=GOOGLE_REVOKE_URI):
+    """Create an instance of GoogleCredentials.
+
+    This constructor is not usually called by the user, instead
+    GoogleCredentials objects are instantiated by
+    GoogleCredentials.from_stream() or
+    GoogleCredentials.get_application_default().
+
+    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 GOOGLE_REVOKE_URI; a token can't be revoked if this is None.
+    """
+    super(GoogleCredentials, self).__init__(
+        access_token, client_id, client_secret, refresh_token, token_expiry,
+        token_uri, user_agent, revoke_uri=revoke_uri)
+
+  def create_scoped_required(self):
+    """Whether this Credentials object is scopeless.
+
+    create_scoped(scopes) method needs to be called in order to create
+    a Credentials object for API calls.
+    """
+    return False
+
+  def create_scoped(self, scopes):
+    """Create a Credentials object for the given scopes.
+
+    The Credentials type is preserved.
+    """
+    return self
+
+  @property
+  def serialization_data(self):
+    """Get the fields and their values identifying the current credentials."""
+    return {
+        'type': 'authorized_user',
+        'client_id': self.client_id,
+        'client_secret': self.client_secret,
+        'refresh_token': self.refresh_token
+    }
+
+  @staticmethod
+  def _implicit_credentials_from_gae(env_name=None):
+    """Attempts to get implicit credentials in Google App Engine env.
+
+    If the current environment is not detected as App Engine, returns None,
+    indicating no Google App Engine credentials can be detected from the
+    current environment.
+
+    Args:
+        env_name: String, indicating current environment.
+
+    Returns:
+        None, if not in GAE, else an appengine.AppAssertionCredentials object.
+    """
+    env_name = env_name or _get_environment()
+    if env_name not in ('GAE_PRODUCTION', 'GAE_LOCAL'):
+      return None
+
+    return _get_application_default_credential_GAE()
+
+  @staticmethod
+  def _implicit_credentials_from_gce(env_name=None):
+    """Attempts to get implicit credentials in Google Compute Engine env.
+
+    If the current environment is not detected as Compute Engine, returns None,
+    indicating no Google Compute Engine credentials can be detected from the
+    current environment.
+
+    Args:
+        env_name: String, indicating current environment.
+
+    Returns:
+        None, if not in GCE, else a gce.AppAssertionCredentials object.
+    """
+    env_name = env_name or _get_environment()
+    if env_name != 'GCE_PRODUCTION':
+      return None
+
+    return _get_application_default_credential_GCE()
+
+  @staticmethod
+  def _implicit_credentials_from_files(env_name=None):
+    """Attempts to get implicit credentials from local credential files.
+
+    First checks if the environment variable GOOGLE_APPLICATION_CREDENTIALS
+    is set with a filename and then falls back to a configuration file (the
+    "well known" file) associated with the 'gcloud' command line tool.
+
+    Args:
+        env_name: Unused argument.
+
+    Returns:
+        Credentials object associated with the GOOGLE_APPLICATION_CREDENTIALS
+            file or the "well known" file if either exist. If neither file is
+            define, returns None, indicating no credentials from a file can
+            detected from the current environment.
+    """
+    credentials_filename = _get_environment_variable_file()
+    if not credentials_filename:
+      credentials_filename = _get_well_known_file()
+      if os.path.isfile(credentials_filename):
+        extra_help = (' (produced automatically when running'
+                      ' "gcloud auth login" command)')
+      else:
+        credentials_filename = None
+    else:
+      extra_help = (' (pointed to by ' + GOOGLE_APPLICATION_CREDENTIALS +
+                    ' environment variable)')
+
+    if not credentials_filename:
+      return
+
+    try:
+      return _get_application_default_credential_from_file(credentials_filename)
+    except (ApplicationDefaultCredentialsError, ValueError) as error:
+      _raise_exception_for_reading_json(credentials_filename, extra_help, error)
+
+  @classmethod
+  def _get_implicit_credentials(cls):
+    """Gets credentials implicitly from the environment.
+
+    Checks environment in order of precedence:
+    - Google App Engine (production and testing)
+    - Environment variable GOOGLE_APPLICATION_CREDENTIALS pointing to
+      a file with stored credentials information.
+    - Stored "well known" file associated with `gcloud` command line tool.
+    - Google Compute Engine production environment.
+
+    Exceptions:
+      ApplicationDefaultCredentialsError: raised when the credentials fail
+          to be retrieved.
+    """
+    env_name = _get_environment()
+
+    # Environ checks (in order). Assumes each checker takes `env_name`
+    # as a kwarg.
+    environ_checkers = [
+      cls._implicit_credentials_from_gae,
+      cls._implicit_credentials_from_files,
+      cls._implicit_credentials_from_gce,
+    ]
+
+    for checker in environ_checkers:
+      credentials = checker(env_name=env_name)
+      if credentials is not None:
+        return credentials
+
+    # If no credentials, fail.
+    raise ApplicationDefaultCredentialsError(ADC_HELP_MSG)
+
+  @staticmethod
+  def get_application_default():
+    """Get the Application Default Credentials for the current environment.
+
+    Exceptions:
+      ApplicationDefaultCredentialsError: raised when the credentials fail
+                                          to be retrieved.
+    """
+    return GoogleCredentials._get_implicit_credentials()
+
+  @staticmethod
+  def from_stream(credential_filename):
+    """Create a Credentials object by reading the information from a given file.
+
+    It returns an object of type GoogleCredentials.
+
+    Args:
+      credential_filename: the path to the file from where the credentials
+        are to be read
+
+    Exceptions:
+      ApplicationDefaultCredentialsError: raised when the credentials fail
+                                          to be retrieved.
+    """
+
+    if credential_filename and os.path.isfile(credential_filename):
+      try:
+        return _get_application_default_credential_from_file(
+            credential_filename)
+      except (ApplicationDefaultCredentialsError, ValueError) as error:
+        extra_help = ' (provided as parameter to the from_stream() method)'
+        _raise_exception_for_reading_json(credential_filename,
+                                          extra_help,
+                                          error)
+    else:
+      raise ApplicationDefaultCredentialsError(
+          'The parameter passed to the from_stream() '
+          'method should point to a file.')
+
+
+def _save_private_file(filename, json_contents):
+  """Saves a file with read-write permissions on for the owner.
+
+  Args:
+    filename: String. Absolute path to file.
+    json_contents: JSON serializable object to be saved.
+  """
+  temp_filename = tempfile.mktemp()
+  file_desc = os.open(temp_filename, os.O_WRONLY | os.O_CREAT, 0o600)
+  with os.fdopen(file_desc, 'w') as file_handle:
+    json.dump(json_contents, file_handle, sort_keys=True,
+              indent=2, separators=(',', ': '))
+  shutil.move(temp_filename, filename)
+
+
+def save_to_well_known_file(credentials, well_known_file=None):
+  """Save the provided GoogleCredentials to the well known file.
+
+  Args:
+    credentials:
+      the credentials to be saved to the well known file;
+      it should be an instance of GoogleCredentials
+    well_known_file:
+      the name of the file where the credentials are to be saved;
+      this parameter is supposed to be used for testing only
+  """
+  # TODO(orestica): move this method to tools.py
+  # once the argparse import gets fixed (it is not present in Python 2.6)
+
+  if well_known_file is None:
+    well_known_file = _get_well_known_file()
+
+  credentials_data = credentials.serialization_data
+  _save_private_file(well_known_file, credentials_data)
+
+
+def _get_environment_variable_file():
+  application_default_credential_filename = (
+      os.environ.get(GOOGLE_APPLICATION_CREDENTIALS,
+                     None))
+
+  if application_default_credential_filename:
+    if os.path.isfile(application_default_credential_filename):
+      return application_default_credential_filename
+    else:
+      raise ApplicationDefaultCredentialsError(
+          'File ' + application_default_credential_filename + ' (pointed by ' +
+          GOOGLE_APPLICATION_CREDENTIALS +
+          ' environment variable) does not exist!')
+
+
+def _get_well_known_file():
+  """Get the well known file produced by command 'gcloud auth login'."""
+  # TODO(orestica): Revisit this method once gcloud provides a better way
+  # of pinpointing the exact location of the file.
+
+  WELL_KNOWN_CREDENTIALS_FILE = 'application_default_credentials.json'
+
+  if os.name == 'nt':
+    try:
+      default_config_path = os.path.join(os.environ['APPDATA'],
+                                         _CLOUDSDK_CONFIG_DIRECTORY)
+    except KeyError:
+      # This should never happen unless someone is really messing with things.
+      drive = os.environ.get('SystemDrive', 'C:')
+      default_config_path = os.path.join(drive, '\\',
+                                         _CLOUDSDK_CONFIG_DIRECTORY)
+  else:
+    default_config_path = os.path.join(os.path.expanduser('~'),
+                                       '.config',
+                                       _CLOUDSDK_CONFIG_DIRECTORY)
+
+  default_config_path = os.path.join(default_config_path,
+                                     WELL_KNOWN_CREDENTIALS_FILE)
+
+  return default_config_path
+
+
+def _get_application_default_credential_from_file(filename):
+  """Build the Application Default Credentials from file."""
+
+  from oauth2client import service_account
+
+  # read the credentials from the file
+  with open(filename) as file_obj:
+    client_credentials = json.load(file_obj)
+
+  credentials_type = client_credentials.get('type')
+  if credentials_type == AUTHORIZED_USER:
+    required_fields = set(['client_id', 'client_secret', 'refresh_token'])
+  elif credentials_type == SERVICE_ACCOUNT:
+    required_fields = set(['client_id', 'client_email', 'private_key_id',
+                           'private_key'])
+  else:
+    raise ApplicationDefaultCredentialsError(
+        "'type' field should be defined (and have one of the '" +
+        AUTHORIZED_USER + "' or '" + SERVICE_ACCOUNT + "' values)")
+
+  missing_fields = required_fields.difference(client_credentials.keys())
+
+  if missing_fields:
+    _raise_exception_for_missing_fields(missing_fields)
+
+  if client_credentials['type'] == AUTHORIZED_USER:
+    return GoogleCredentials(
+        access_token=None,
+        client_id=client_credentials['client_id'],
+        client_secret=client_credentials['client_secret'],
+        refresh_token=client_credentials['refresh_token'],
+        token_expiry=None,
+        token_uri=GOOGLE_TOKEN_URI,
+        user_agent='Python client library')
+  else:  # client_credentials['type'] == SERVICE_ACCOUNT
+    return service_account._ServiceAccountCredentials(
+        service_account_id=client_credentials['client_id'],
+        service_account_email=client_credentials['client_email'],
+        private_key_id=client_credentials['private_key_id'],
+        private_key_pkcs8_text=client_credentials['private_key'],
+        scopes=[])
+
+
+def _raise_exception_for_missing_fields(missing_fields):
+  raise ApplicationDefaultCredentialsError(
+      'The following field(s) must be defined: ' + ', '.join(missing_fields))
+
+
+def _raise_exception_for_reading_json(credential_file,
+                                      extra_help,
+                                      error):
+  raise ApplicationDefaultCredentialsError(
+      'An error was encountered while reading json file: '+
+      credential_file + extra_help + ': ' + str(error))
+
+
+def _get_application_default_credential_GAE():
+  from oauth2client.appengine import AppAssertionCredentials
+
+  return AppAssertionCredentials([])
+
+
+def _get_application_default_credential_GCE():
+  from oauth2client.gce import AppAssertionCredentials
+
+  return AppAssertionCredentials([])
+
+
+class AssertionCredentials(GoogleCredentials):
   """Abstract Credentials object used for OAuth 2.0 assertion grants.
 
   This credential does not require a flow to instantiate because it
@@ -859,7 +1396,7 @@
   def _generate_refresh_request_body(self):
     assertion = self._generate_assertion()
 
-    body = urllib.urlencode({
+    body = urllib.parse.urlencode({
         'assertion': assertion,
         'grant_type': 'urn:ietf:params:oauth:grant-type:jwt-bearer',
         })
@@ -882,141 +1419,157 @@
     self._do_revoke(http_request, self.access_token)
 
 
-if HAS_CRYPTO:
-  # PyOpenSSL and PyCrypto are not prerequisites for oauth2client, so if it is
-  # missing then don't create the SignedJwtAssertionCredentials or the
-  # verify_id_token() method.
+def _RequireCryptoOrDie():
+  """Ensure we have a crypto library, or throw CryptoUnavailableError.
 
-  class SignedJwtAssertionCredentials(AssertionCredentials):
-    """Credentials object used for OAuth 2.0 Signed JWT assertion grants.
+  The oauth2client.crypt module requires either PyCrypto or PyOpenSSL
+  to be available in order to function, but these are optional
+  dependencies.
+  """
+  if not HAS_CRYPTO:
+    raise CryptoUnavailableError('No crypto library available')
 
-    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.
 
-    SignedJwtAssertionCredentials requires either PyOpenSSL, or PyCrypto 2.6 or
-    later. For App Engine you may also consider using AppAssertionCredentials.
-    """
+class SignedJwtAssertionCredentials(AssertionCredentials):
+  """Credentials object used for OAuth 2.0 Signed JWT assertion grants.
 
-    MAX_TOKEN_LIFETIME_SECS = 3600 # 1 hour in seconds
+  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(4)
-    def __init__(self,
-        service_account_name,
-        private_key,
-        scope,
-        private_key_password='notasecret',
-        user_agent=None,
-        token_uri=GOOGLE_TOKEN_URI,
-        revoke_uri=GOOGLE_REVOKE_URI,
-        **kwargs):
-      """Constructor for SignedJwtAssertionCredentials.
+  SignedJwtAssertionCredentials requires either PyOpenSSL, or PyCrypto
+  2.6 or later. For App Engine you may also consider using
+  AppAssertionCredentials.
+  """
 
-      Args:
-        service_account_name: string, id for account, usually an email address.
-        private_key: string, private key in PKCS12 or PEM format.
-        scope: string or iterable of strings, scope(s) of the credentials being
-          requested.
-        private_key_password: string, password for private_key, unused if
-          private_key is in PEM format.
-        user_agent: string, 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.
-        revoke_uri: string, URI for revoke endpoint.
-        kwargs: kwargs, Additional parameters to add to the JWT token, for
-          example sub=joe@xample.org."""
+  MAX_TOKEN_LIFETIME_SECS = 3600  # 1 hour in seconds
 
-      super(SignedJwtAssertionCredentials, self).__init__(
-          None,
-          user_agent=user_agent,
-          token_uri=token_uri,
-          revoke_uri=revoke_uri,
-          )
-
-      self.scope = util.scopes_to_string(scope)
-
-      # Keep base64 encoded so it can be stored in JSON.
-      self.private_key = base64.b64encode(private_key)
-
-      self.private_key_password = private_key_password
-      self.service_account_name = service_account_name
-      self.kwargs = kwargs
-
-    @classmethod
-    def from_json(cls, s):
-      data = simplejson.loads(s)
-      retval = SignedJwtAssertionCredentials(
-          data['service_account_name'],
-          base64.b64decode(data['private_key']),
-          data['scope'],
-          private_key_password=data['private_key_password'],
-          user_agent=data['user_agent'],
-          token_uri=data['token_uri'],
-          **data['kwargs']
-          )
-      retval.invalid = data['invalid']
-      retval.access_token = data['access_token']
-      return retval
-
-    def _generate_assertion(self):
-      """Generate the assertion that will be used in the request."""
-      now = long(time.time())
-      payload = {
-          'aud': self.token_uri,
-          'scope': self.scope,
-          'iat': now,
-          'exp': now + SignedJwtAssertionCredentials.MAX_TOKEN_LIFETIME_SECS,
-          'iss': self.service_account_name
-      }
-      payload.update(self.kwargs)
-      logger.debug(str(payload))
-
-      private_key = base64.b64decode(self.private_key)
-      return crypt.make_signed_jwt(crypt.Signer.from_string(
-          private_key, self.private_key_password), payload)
-
-  # Only used in verify_id_token(), which is always calling to the same URI
-  # for the certs.
-  _cached_http = httplib2.Http(MemoryCache())
-
-  @util.positional(2)
-  def verify_id_token(id_token, audience, http=None,
-      cert_uri=ID_TOKEN_VERIFICATON_CERTS):
-    """Verifies a signed JWT id_token.
-
-    This function requires PyOpenSSL and because of that it does not work on
-    App Engine.
+  @util.positional(4)
+  def __init__(self,
+               service_account_name,
+               private_key,
+               scope,
+               private_key_password='notasecret',
+               user_agent=None,
+               token_uri=GOOGLE_TOKEN_URI,
+               revoke_uri=GOOGLE_REVOKE_URI,
+               **kwargs):
+    """Constructor for SignedJwtAssertionCredentials.
 
     Args:
-      id_token: string, A Signed JWT.
-      audience: string, The audience 'aud' that the token should be for.
-      http: httplib2.Http, instance to use to make the HTTP request. Callers
-        should supply an instance that has caching enabled.
-      cert_uri: string, URI of the certificates in JSON format to
-        verify the JWT against.
-
-    Returns:
-      The deserialized JSON in the JWT.
+      service_account_name: string, id for account, usually an email address.
+      private_key: string, private key in PKCS12 or PEM format.
+      scope: string or iterable of strings, scope(s) of the credentials being
+        requested.
+      private_key_password: string, password for private_key, unused if
+        private_key is in PEM format.
+      user_agent: string, 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.
+      revoke_uri: string, URI for revoke endpoint.
+      kwargs: kwargs, Additional parameters to add to the JWT token, for
+        example sub=joe@xample.org.
 
     Raises:
-      oauth2client.crypt.AppIdentityError if the JWT fails to verify.
+      CryptoUnavailableError if no crypto library is available.
     """
-    if http is None:
-      http = _cached_http
+    _RequireCryptoOrDie()
+    super(SignedJwtAssertionCredentials, self).__init__(
+        None,
+        user_agent=user_agent,
+        token_uri=token_uri,
+        revoke_uri=revoke_uri,
+        )
 
-    resp, content = http.request(cert_uri)
+    self.scope = util.scopes_to_string(scope)
 
-    if resp.status == 200:
-      certs = simplejson.loads(content)
-      return crypt.verify_signed_jwt_with_certs(id_token, certs, audience)
-    else:
-      raise VerifyJwtTokenError('Status code: %d' % resp.status)
+    # Keep base64 encoded so it can be stored in JSON.
+    self.private_key = base64.b64encode(private_key)
+    if isinstance(self.private_key, six.text_type):
+      self.private_key = self.private_key.encode('utf-8')
+
+    self.private_key_password = private_key_password
+    self.service_account_name = service_account_name
+    self.kwargs = kwargs
+
+  @classmethod
+  def from_json(cls, s):
+    data = json.loads(s)
+    retval = SignedJwtAssertionCredentials(
+        data['service_account_name'],
+        base64.b64decode(data['private_key']),
+        data['scope'],
+        private_key_password=data['private_key_password'],
+        user_agent=data['user_agent'],
+        token_uri=data['token_uri'],
+        **data['kwargs']
+        )
+    retval.invalid = data['invalid']
+    retval.access_token = data['access_token']
+    return retval
+
+  def _generate_assertion(self):
+    """Generate the assertion that will be used in the request."""
+    now = int(time.time())
+    payload = {
+        'aud': self.token_uri,
+        'scope': self.scope,
+        'iat': now,
+        'exp': now + SignedJwtAssertionCredentials.MAX_TOKEN_LIFETIME_SECS,
+        'iss': self.service_account_name
+    }
+    payload.update(self.kwargs)
+    logger.debug(str(payload))
+
+    private_key = base64.b64decode(self.private_key)
+    return crypt.make_signed_jwt(crypt.Signer.from_string(
+        private_key, self.private_key_password), payload)
+
+# Only used in verify_id_token(), which is always calling to the same URI
+# for the certs.
+_cached_http = httplib2.Http(MemoryCache())
+
+@util.positional(2)
+def verify_id_token(id_token, audience, http=None,
+                    cert_uri=ID_TOKEN_VERIFICATION_CERTS):
+  """Verifies a signed JWT id_token.
+
+  This function requires PyOpenSSL and because of that it does not work on
+  App Engine.
+
+  Args:
+    id_token: string, A Signed JWT.
+    audience: string, The audience 'aud' that the token should be for.
+    http: httplib2.Http, instance to use to make the HTTP request. Callers
+      should supply an instance that has caching enabled.
+    cert_uri: string, URI of the certificates in JSON format to
+      verify the JWT against.
+
+  Returns:
+    The deserialized JSON in the JWT.
+
+  Raises:
+    oauth2client.crypt.AppIdentityError: if the JWT fails to verify.
+    CryptoUnavailableError: if no crypto library is available.
+  """
+  _RequireCryptoOrDie()
+  if http is None:
+    http = _cached_http
+
+  resp, content = http.request(cert_uri)
+
+  if resp.status == 200:
+    certs = json.loads(content.decode('utf-8'))
+    return crypt.verify_signed_jwt_with_certs(id_token, certs, audience)
+  else:
+    raise VerifyJwtTokenError('Status code: %d' % resp.status)
 
 
 def _urlsafe_b64decode(b64string):
   # Guard against unicode strings, which base64 can't handle.
-  b64string = b64string.encode('ascii')
-  padded = b64string + '=' * (4 - len(b64string) % 4)
+  if isinstance(b64string, six.text_type):
+    b64string = b64string.encode('ascii')
+  padded = b64string + b'=' * (4 - len(b64string) % 4)
   return base64.urlsafe_b64decode(padded)
 
 
@@ -1026,18 +1579,21 @@
   Does the extraction w/o checking the signature.
 
   Args:
-    id_token: string, OAuth 2.0 id_token.
+    id_token: string or bytestring, OAuth 2.0 id_token.
 
   Returns:
     object, The deserialized JSON payload.
   """
-  segments = id_token.split('.')
+  if type(id_token) == bytes:
+    segments = id_token.split(b'.')
+  else:
+    segments = id_token.split(u'.')
 
-  if (len(segments) != 3):
+  if len(segments) != 3:
     raise VerifyJwtTokenError(
-      'Wrong number of segments in token: %s' % id_token)
+        'Wrong number of segments in token: %s' % id_token)
 
-  return simplejson.loads(_urlsafe_b64decode(segments[1]))
+  return json.loads(_urlsafe_b64decode(segments[1]).decode('utf-8'))
 
 
 def _parse_exchange_token_response(content):
@@ -1055,11 +1611,12 @@
   """
   resp = {}
   try:
-    resp = simplejson.loads(content)
-  except StandardError:
+    resp = json.loads(content.decode('utf-8'))
+  except Exception:
     # different JSON libs raise different exceptions,
     # so we just do a catch-all here
-    resp = dict(parse_qsl(content))
+    content = content.decode('utf-8')
+    resp = dict(urllib.parse.parse_qsl(content))
 
   # some providers respond with 'expires', others with 'expires_in'
   if resp and 'expires' in resp:
@@ -1073,14 +1630,15 @@
                           redirect_uri='postmessage', http=None,
                           user_agent=None, token_uri=GOOGLE_TOKEN_URI,
                           auth_uri=GOOGLE_AUTH_URI,
-                          revoke_uri=GOOGLE_REVOKE_URI):
+                          revoke_uri=GOOGLE_REVOKE_URI,
+                          device_uri=GOOGLE_DEVICE_URI):
   """Exchanges an authorization code for an OAuth2Credentials object.
 
   Args:
     client_id: string, client identifier.
     client_secret: string, client secret.
     scope: string or iterable of strings, scope(s) to request.
-    code: string, An authroization code, most likely passed down from
+    code: string, An authorization code, most likely passed down from
       the client
     redirect_uri: string, this is generally set to 'postmessage' to match the
       redirect_uri that the client specified
@@ -1091,6 +1649,8 @@
       defaults to Google's endpoints but any OAuth 2.0 provider can be used.
     revoke_uri: string, URI for revoke endpoint. For convenience
       defaults to Google's endpoints but any OAuth 2.0 provider can be used.
+    device_uri: string, URI for device authorization endpoint. For convenience
+      defaults to Google's endpoints but any OAuth 2.0 provider can be used.
 
   Returns:
     An OAuth2Credentials object.
@@ -1102,7 +1662,7 @@
   flow = OAuth2WebServerFlow(client_id, client_secret, scope,
                              redirect_uri=redirect_uri, user_agent=user_agent,
                              auth_uri=auth_uri, token_uri=token_uri,
-                             revoke_uri=revoke_uri)
+                             revoke_uri=revoke_uri, device_uri=device_uri)
 
   credentials = flow.step2_exchange(code, http=http)
   return credentials
@@ -1113,7 +1673,8 @@
                                             message = None,
                                             redirect_uri='postmessage',
                                             http=None,
-                                            cache=None):
+                                            cache=None,
+                                            device_uri=None):
   """Returns OAuth2Credentials from a clientsecrets file and an auth code.
 
   Will create the right kind of Flow based on the contents of the clientsecrets
@@ -1133,6 +1694,7 @@
     http: httplib2.Http, optional http instance to use to do the fetch
     cache: An optional cache service client that implements get() and set()
       methods. See clientsecrets.loadfile() for details.
+    device_uri: string, OAuth 2.0 device authorization endpoint
 
   Returns:
     An OAuth2Credentials object.
@@ -1145,11 +1707,49 @@
       invalid.
   """
   flow = flow_from_clientsecrets(filename, scope, message=message, cache=cache,
-                                 redirect_uri=redirect_uri)
+                                 redirect_uri=redirect_uri,
+                                 device_uri=device_uri)
   credentials = flow.step2_exchange(code, http=http)
   return credentials
 
 
+class DeviceFlowInfo(collections.namedtuple('DeviceFlowInfo', (
+    'device_code', 'user_code', 'interval', 'verification_url',
+    'user_code_expiry'))):
+  """Intermediate information the OAuth2 for devices flow."""
+
+  @classmethod
+  def FromResponse(cls, response):
+    """Create a DeviceFlowInfo from a server response.
+
+    The response should be a dict containing entries as described here:
+
+      http://tools.ietf.org/html/draft-ietf-oauth-v2-05#section-3.7.1
+    """
+    # device_code, user_code, and verification_url are required.
+    kwargs = {
+        'device_code': response['device_code'],
+        'user_code': response['user_code'],
+    }
+    # The response may list the verification address as either
+    # verification_url or verification_uri, so we check for both.
+    verification_url = response.get(
+        'verification_url', response.get('verification_uri'))
+    if verification_url is None:
+      raise OAuth2DeviceCodeError(
+          'No verification_url provided in server response')
+    kwargs['verification_url'] = verification_url
+    # expires_in and interval are optional.
+    kwargs.update({
+        'interval': response.get('interval'),
+        'user_code_expiry': None,
+    })
+    if 'expires_in' in response:
+      kwargs['user_code_expiry'] = datetime.datetime.now() + datetime.timedelta(
+          seconds=int(response['expires_in']))
+
+    return cls(**kwargs)
+
 class OAuth2WebServerFlow(Flow):
   """Does the Web Server Flow for OAuth 2.0.
 
@@ -1163,6 +1763,8 @@
                auth_uri=GOOGLE_AUTH_URI,
                token_uri=GOOGLE_TOKEN_URI,
                revoke_uri=GOOGLE_REVOKE_URI,
+               login_hint=None,
+               device_uri=GOOGLE_DEVICE_URI,
                **kwargs):
     """Constructor for OAuth2WebServerFlow.
 
@@ -1185,6 +1787,11 @@
         defaults to Google's endpoints but any OAuth 2.0 provider can be used.
       revoke_uri: string, URI for revoke endpoint. For convenience
         defaults to Google's endpoints but any OAuth 2.0 provider can be used.
+      login_hint: string, Either an email address or domain. Passing this hint
+        will either pre-fill the email box on the sign-in form or select the
+        proper multi-login session, thereby simplifying the login flow.
+      device_uri: string, URI for device authorization 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.
     """
@@ -1192,10 +1799,12 @@
     self.client_secret = client_secret
     self.scope = util.scopes_to_string(scope)
     self.redirect_uri = redirect_uri
+    self.login_hint = login_hint
     self.user_agent = user_agent
     self.auth_uri = auth_uri
     self.token_uri = token_uri
     self.revoke_uri = revoke_uri
+    self.device_uri = device_uri
     self.params = {
         'access_type': 'offline',
         'response_type': 'code',
@@ -1216,8 +1825,9 @@
       A URI as a string to redirect the user to begin the authorization flow.
     """
     if redirect_uri is not None:
-      logger.warning(('The redirect_uri parameter for'
-          'OAuth2WebServerFlow.step1_get_authorize_url is deprecated. Please'
+      logger.warning((
+          'The redirect_uri parameter for '
+          'OAuth2WebServerFlow.step1_get_authorize_url is deprecated. Please '
           'move to passing the redirect_uri in via the constructor.'))
       self.redirect_uri = redirect_uri
 
@@ -1229,45 +1839,107 @@
         'redirect_uri': self.redirect_uri,
         'scope': self.scope,
     }
+    if self.login_hint is not None:
+      query_params['login_hint'] = self.login_hint
     query_params.update(self.params)
     return _update_query_params(self.auth_uri, query_params)
 
+  @util.positional(1)
+  def step1_get_device_and_user_codes(self, http=None):
+    """Returns a user code and the verification URL where to enter it
+
+    Returns:
+      A user code as a string for the user to authorize the application
+      An URL as a string where the user has to enter the code
+    """
+    if self.device_uri is None:
+      raise ValueError('The value of device_uri must not be None.')
+
+    body = urllib.parse.urlencode({
+        'client_id': self.client_id,
+        '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.device_uri, method='POST', body=body,
+                                 headers=headers)
+    if resp.status == 200:
+      try:
+        flow_info = json.loads(content)
+      except ValueError as e:
+        raise OAuth2DeviceCodeError(
+            'Could not parse server response as JSON: "%s", error: "%s"' % (
+                content, e))
+      return DeviceFlowInfo.FromResponse(flow_info)
+    else:
+      error_msg = 'Invalid response %s.' % resp.status
+      try:
+        d = json.loads(content)
+        if 'error' in d:
+          error_msg += ' Error: %s' % d['error']
+      except ValueError:
+        # Couldn't decode a JSON response, stick with the default message.
+        pass
+      raise OAuth2DeviceCodeError(error_msg)
+
   @util.positional(2)
-  def step2_exchange(self, code, http=None):
-    """Exhanges a code for OAuth2Credentials.
+  def step2_exchange(self, code=None, http=None, device_flow_info=None):
+    """Exchanges 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
+
+      code: string, a dict-like object, or None. For a non-device
+          flow, this is either the response code as a string, or a
+          dictionary of query parameters to the redirect_uri. For a
+          device flow, this should be None.
+      http: httplib2.Http, optional http instance to use when fetching
+          credentials.
+      device_flow_info: DeviceFlowInfo, return value from step1 in the
+          case of a device flow.
 
     Returns:
       An OAuth2Credentials object that can be used to authorize requests.
 
     Raises:
-      FlowExchangeError if a problem occured exchanging the code for a
-      refresh_token.
+      FlowExchangeError: if a problem occurred exchanging the code for a
+          refresh_token.
+      ValueError: if code and device_flow_info are both provided or both
+          missing.
+
     """
+    if code is None and device_flow_info is None:
+      raise ValueError('No code or device_flow_info provided.')
+    if code is not None and device_flow_info is not None:
+      raise ValueError('Cannot provide both code and device_flow_info.')
 
-    if not (isinstance(code, str) or isinstance(code, unicode)):
+    if code is None:
+      code = device_flow_info.device_code
+    elif not isinstance(code, six.string_types):
       if 'code' not in code:
-        if 'error' in code:
-          error_msg = code['error']
-        else:
-          error_msg = 'No code was supplied in the query parameters.'
-        raise FlowExchangeError(error_msg)
-      else:
-        code = code['code']
+        raise FlowExchangeError(code.get(
+            'error', 'No code was supplied in the query parameters.'))
+      code = code['code']
 
-    body = urllib.urlencode({
-        'grant_type': 'authorization_code',
+    post_data = {
         'client_id': self.client_id,
         'client_secret': self.client_secret,
         'code': code,
-        'redirect_uri': self.redirect_uri,
         'scope': self.scope,
-        })
+    }
+    if device_flow_info is not None:
+      post_data['grant_type'] = 'http://oauth.net/grant_type/device/1.0'
+    else:
+      post_data['grant_type'] = 'authorization_code'
+      post_data['redirect_uri'] = self.redirect_uri
+    body = urllib.parse.urlencode(post_data)
     headers = {
         'content-type': 'application/x-www-form-urlencoded',
     }
@@ -1284,26 +1956,31 @@
     if resp.status == 200 and 'access_token' in d:
       access_token = d['access_token']
       refresh_token = d.get('refresh_token', None)
+      if not refresh_token:
+        logger.info(
+            'Received token response with no refresh_token. Consider '
+            "reauthenticating with approval_prompt='force'.")
       token_expiry = None
       if 'expires_in' in d:
         token_expiry = datetime.datetime.utcnow() + datetime.timedelta(
             seconds=int(d['expires_in']))
 
+      extracted_id_token = None
       if 'id_token' in d:
-        d['id_token'] = _extract_id_token(d['id_token'])
+        extracted_id_token = _extract_id_token(d['id_token'])
 
       logger.info('Successfully retrieved access token')
       return OAuth2Credentials(access_token, self.client_id,
                                self.client_secret, refresh_token, token_expiry,
                                self.token_uri, self.user_agent,
                                revoke_uri=self.revoke_uri,
-                               id_token=d.get('id_token', None),
+                               id_token=extracted_id_token,
                                token_response=d)
     else:
-      logger.info('Failed to retrieve access token: %s' % content)
+      logger.info('Failed to retrieve access token: %s', content)
       if 'error' in d:
         # you never know what those providers got to say
-        error_msg = unicode(d['error'])
+        error_msg = str(d['error']) + str(d.get('error_description', ''))
       else:
         error_msg = 'Invalid response: %s.' % str(resp.status)
       raise FlowExchangeError(error_msg)
@@ -1311,7 +1988,8 @@
 
 @util.positional(2)
 def flow_from_clientsecrets(filename, scope, redirect_uri=None,
-                            message=None, cache=None):
+                            message=None, cache=None, login_hint=None,
+                            device_uri=None):
   """Create a Flow from a clientsecrets file.
 
   Will create the right kind of Flow based on the contents of the clientsecrets
@@ -1329,6 +2007,11 @@
       provided then clientsecrets.InvalidClientSecretsError will be raised.
     cache: An optional cache service client that implements get() and set()
       methods. See clientsecrets.loadfile() for details.
+    login_hint: string, Either an email address or domain. Passing this hint
+      will either pre-fill the email box on the sign-in form or select the
+      proper multi-login session, thereby simplifying the login flow.
+    device_uri: string, URI for device authorization endpoint. For convenience
+      defaults to Google's endpoints but any OAuth 2.0 provider can be used.
 
   Returns:
     A Flow object.
@@ -1345,10 +2028,13 @@
           'redirect_uri': redirect_uri,
           'auth_uri': client_info['auth_uri'],
           'token_uri': client_info['token_uri'],
+          'login_hint': login_hint,
       }
       revoke_uri = client_info.get('revoke_uri')
       if revoke_uri is not None:
         constructor_kwargs['revoke_uri'] = revoke_uri
+      if device_uri is not None:
+        constructor_kwargs['device_uri'] = device_uri
       return OAuth2WebServerFlow(
           client_info['client_id'], client_info['client_secret'],
           scope, **constructor_kwargs)
@@ -1360,4 +2046,4 @@
       raise
   else:
     raise UnknownClientSecretsFlowError(
-        'This OAuth 2.0 flow is unsupported: %r' % client_type)
+        'This OAuth 2.0 flow is unsupported: %r' % client_type)
\ No newline at end of file
diff --git a/third_party/oauth2client/clientsecrets.py b/third_party/oauth2client/clientsecrets.py
index ac99aae..af079ec 100644
--- a/third_party/oauth2client/clientsecrets.py
+++ b/third_party/oauth2client/clientsecrets.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2011 Google Inc.
+# 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.
@@ -20,8 +20,10 @@
 
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
+import json
 
-from anyjson import simplejson
+from third_party import six
+
 
 # Properties that make a client_secrets.json file valid.
 TYPE_WEB = 'web'
@@ -68,11 +70,21 @@
 
 
 def _validate_clientsecrets(obj):
-  if obj is None or len(obj) != 1:
-    raise InvalidClientSecretsError('Invalid file format.')
-  client_type = obj.keys()[0]
-  if client_type not in VALID_CLIENT.keys():
-    raise InvalidClientSecretsError('Unknown client type: %s.' % client_type)
+  _INVALID_FILE_FORMAT_MSG = (
+    'Invalid file format. See '
+    'https://developers.google.com/api-client-library/'
+    'python/guide/aaa_client_secrets')
+
+  if obj is None:
+    raise InvalidClientSecretsError(_INVALID_FILE_FORMAT_MSG)
+  if len(obj) != 1:
+    raise InvalidClientSecretsError(
+      _INVALID_FILE_FORMAT_MSG + ' '
+      'Expected a JSON object with a single property for a "web" or '
+      '"installed" application')
+  client_type = tuple(obj)[0]
+  if client_type not in VALID_CLIENT:
+    raise InvalidClientSecretsError('Unknown client type: %s.' % (client_type,))
   client_info = obj[client_type]
   for prop_name in VALID_CLIENT[client_type]['required']:
     if prop_name not in client_info:
@@ -87,22 +99,19 @@
 
 
 def load(fp):
-  obj = simplejson.load(fp)
+  obj = json.load(fp)
   return _validate_clientsecrets(obj)
 
 
 def loads(s):
-  obj = simplejson.loads(s)
+  obj = json.loads(s)
   return _validate_clientsecrets(obj)
 
 
 def _loadfile(filename):
   try:
-    fp = file(filename, 'r')
-    try:
-      obj = simplejson.load(fp)
-    finally:
-      fp.close()
+    with open(filename, 'r') as fp:
+      obj = json.load(fp)
   except IOError:
     raise InvalidClientSecretsError('File not found: "%s"' % filename)
   return _validate_clientsecrets(obj)
@@ -114,10 +123,12 @@
   Typical cache storage would be App Engine memcache service,
   but you can pass in any other cache client that implements
   these methods:
-    - get(key, namespace=ns)
-    - set(key, value, namespace=ns)
 
-  Usage:
+  * ``get(key, namespace=ns)``
+  * ``set(key, value, namespace=ns)``
+
+  Usage::
+
     # without caching
     client_type, client_info = loadfile('secrets.json')
     # using App Engine memcache service
@@ -150,4 +161,4 @@
     obj = {client_type: client_info}
     cache.set(filename, obj, namespace=_SECRET_NAMESPACE)
 
-  return obj.iteritems().next()
+  return next(six.iteritems(obj))
\ No newline at end of file
diff --git a/third_party/oauth2client/crypt.py b/third_party/oauth2client/crypt.py
index 2d31815..b5b8cab 100644
--- a/third_party/oauth2client/crypt.py
+++ b/third_party/oauth2client/crypt.py
@@ -1,7 +1,6 @@
-#!/usr/bin/python2.4
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2011 Google Inc.
+# 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.
@@ -14,13 +13,15 @@
 # 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.
+"""Crypto-related routines for oauth2client."""
 
 import base64
-import hashlib
+import json
 import logging
+import sys
 import time
 
-from anyjson import simplejson
+from third_party import six
 
 
 CLOCK_SKEW_SECS = 300  # 5 minutes in seconds
@@ -38,7 +39,6 @@
 try:
   from OpenSSL import crypto
 
-
   class OpenSSLVerifier(object):
     """Verifies the signature on a message."""
 
@@ -62,6 +62,8 @@
         key that this object was constructed with.
       """
       try:
+        if isinstance(message, six.text_type):
+          message = message.encode('utf-8')
         crypto.verify(self._pubkey, signature, message, 'sha256')
         return True
       except:
@@ -104,15 +106,17 @@
       """Signs a message.
 
       Args:
-        message: string, Message to be signed.
+        message: bytes, Message to be signed.
 
       Returns:
         string, The signature of the message for the given key.
       """
+      if isinstance(message, six.text_type):
+        message = message.encode('utf-8')
       return crypto.sign(self._key, message, 'sha256')
 
     @staticmethod
-    def from_string(key, password='notasecret'):
+    def from_string(key, password=b'notasecret'):
       """Construct a Signer instance from a string.
 
       Args:
@@ -125,21 +129,45 @@
       Raises:
         OpenSSL.crypto.Error if the key can't be parsed.
       """
-      if key.startswith('-----BEGIN '):
-        pkey = crypto.load_privatekey(crypto.FILETYPE_PEM, key)
+      parsed_pem_key = _parse_pem_key(key)
+      if parsed_pem_key:
+        pkey = crypto.load_privatekey(crypto.FILETYPE_PEM, parsed_pem_key)
       else:
+        if isinstance(password, six.text_type):
+          password = password.encode('utf-8')
         pkey = crypto.load_pkcs12(key, password).get_privatekey()
       return OpenSSLSigner(pkey)
 
+
+  def pkcs12_key_as_pem(private_key_text, private_key_password):
+    """Convert the contents of a PKCS12 key to PEM using OpenSSL.
+
+    Args:
+      private_key_text: String. Private key.
+      private_key_password: String. Password for PKCS12.
+
+    Returns:
+      String. PEM contents of ``private_key_text``.
+    """
+    decoded_body = base64.b64decode(private_key_text)
+    if isinstance(private_key_password, six.string_types):
+      private_key_password = private_key_password.encode('ascii')
+
+    pkcs12 = crypto.load_pkcs12(decoded_body, private_key_password)
+    return crypto.dump_privatekey(crypto.FILETYPE_PEM,
+                                  pkcs12.get_privatekey())
 except ImportError:
   OpenSSLVerifier = None
   OpenSSLSigner = None
+  def pkcs12_key_as_pem(*args, **kwargs):
+    raise NotImplementedError('pkcs12_key_as_pem requires OpenSSL.')
 
 
 try:
   from Crypto.PublicKey import RSA
   from Crypto.Hash import SHA256
   from Crypto.Signature import PKCS1_v1_5
+  from Crypto.Util.asn1 import DerSequence
 
 
   class PyCryptoVerifier(object):
@@ -181,14 +209,17 @@
 
       Returns:
         Verifier instance.
-
-      Raises:
-        NotImplementedError if is_x509_cert is true.
       """
       if is_x509_cert:
-        raise NotImplementedError(
-            'X509 certs are not supported by the PyCrypto library. '
-            'Try using PyOpenSSL if native code is an option.')
+        if isinstance(key_pem, six.text_type):
+          key_pem = key_pem.encode('ascii')
+        pemLines = key_pem.replace(b' ', b'').split()
+        certDer = _urlsafe_b64decode(b''.join(pemLines[1:-1]))
+        certSeq = DerSequence()
+        certSeq.decode(certDer)
+        tbsSeq = DerSequence()
+        tbsSeq.decode(certSeq[0])
+        pubkey = RSA.importKey(tbsSeq[6])
       else:
         pubkey = RSA.importKey(key_pem)
       return PyCryptoVerifier(pubkey)
@@ -214,6 +245,8 @@
       Returns:
         string, The signature of the message for the given key.
       """
+      if isinstance(message, six.text_type):
+        message = message.encode('utf-8')
       return PKCS1_v1_5.new(self._key).sign(SHA256.new(message))
 
     @staticmethod
@@ -230,11 +263,12 @@
       Raises:
         NotImplementedError if they key isn't in PEM format.
       """
-      if key.startswith('-----BEGIN '):
-        pkey = RSA.importKey(key)
+      parsed_pem_key = _parse_pem_key(key)
+      if parsed_pem_key:
+        pkey = RSA.importKey(parsed_pem_key)
       else:
         raise NotImplementedError(
-            'PKCS12 format is not supported by the PyCrpto library. '
+            'PKCS12 format is not supported by the PyCrypto library. '
             'Try converting to a "PEM" '
             '(openssl pkcs12 -in xxxxx.p12 -nodes -nocerts > privatekey.pem) '
             'or using PyOpenSSL if native code is an option.')
@@ -256,19 +290,39 @@
                     'PyOpenSSL, or PyCrypto 2.6 or later')
 
 
+def _parse_pem_key(raw_key_input):
+  """Identify and extract PEM keys.
+
+  Determines whether the given key is in the format of PEM key, and extracts
+  the relevant part of the key if it is.
+
+  Args:
+    raw_key_input: The contents of a private key file (either PEM or PKCS12).
+
+  Returns:
+    string, The actual key if the contents are from a PEM file, or else None.
+  """
+  offset = raw_key_input.find(b'-----BEGIN ')
+  if offset != -1:
+    return raw_key_input[offset:]
+
+
 def _urlsafe_b64encode(raw_bytes):
-  return base64.urlsafe_b64encode(raw_bytes).rstrip('=')
+  if isinstance(raw_bytes, six.text_type):
+    raw_bytes = raw_bytes.encode('utf-8')
+  return base64.urlsafe_b64encode(raw_bytes).decode('ascii').rstrip('=')
 
 
 def _urlsafe_b64decode(b64string):
   # Guard against unicode strings, which base64 can't handle.
-  b64string = b64string.encode('ascii')
-  padded = b64string + '=' * (4 - len(b64string) % 4)
+  if isinstance(b64string, six.text_type):
+    b64string = b64string.encode('ascii')
+  padded = b64string + b'=' * (4 - len(b64string) % 4)
   return base64.urlsafe_b64decode(padded)
 
 
 def _json_encode(data):
-  return simplejson.dumps(data, separators = (',', ':'))
+  return json.dumps(data, separators=(',', ':'))
 
 
 def make_signed_jwt(signer, payload):
@@ -286,8 +340,8 @@
   header = {'typ': 'JWT', 'alg': 'RS256'}
 
   segments = [
-          _urlsafe_b64encode(_json_encode(header)),
-          _urlsafe_b64encode(_json_encode(payload)),
+      _urlsafe_b64encode(_json_encode(header)),
+      _urlsafe_b64encode(_json_encode(payload)),
   ]
   signing_input = '.'.join(segments)
 
@@ -318,9 +372,8 @@
   """
   segments = jwt.split('.')
 
-  if (len(segments) != 3):
-    raise AppIdentityError(
-      'Wrong number of segments in token: %s' % jwt)
+  if len(segments) != 3:
+    raise AppIdentityError('Wrong number of segments in token: %s' % jwt)
   signed = '%s.%s' % (segments[0], segments[1])
 
   signature = _urlsafe_b64decode(segments[2])
@@ -328,15 +381,15 @@
   # Parse token.
   json_body = _urlsafe_b64decode(segments[1])
   try:
-    parsed = simplejson.loads(json_body)
+    parsed = json.loads(json_body.decode('utf-8'))
   except:
     raise AppIdentityError('Can\'t parse token: %s' % json_body)
 
   # Check signature.
   verified = False
-  for (keyname, pem) in certs.items():
+  for pem in certs.values():
     verifier = Verifier.from_string(pem, True)
-    if (verifier.verify(signed, signature)):
+    if verifier.verify(signed, signature):
       verified = True
       break
   if not verified:
@@ -349,21 +402,20 @@
   earliest = iat - CLOCK_SKEW_SECS
 
   # Check expiration timestamp.
-  now = long(time.time())
+  now = int(time.time())
   exp = parsed.get('exp')
   if exp is None:
     raise AppIdentityError('No exp field in token: %s' % json_body)
   if exp >= now + MAX_TOKEN_LIFETIME_SECS:
-    raise AppIdentityError(
-      'exp field too far in future: %s' % json_body)
+    raise AppIdentityError('exp field too far in future: %s' % json_body)
   latest = exp + CLOCK_SKEW_SECS
 
   if now < earliest:
     raise AppIdentityError('Token used too early, %d < %d: %s' %
-      (now, earliest, json_body))
+                           (now, earliest, json_body))
   if now > latest:
     raise AppIdentityError('Token used too late, %d > %d: %s' %
-      (now, latest, json_body))
+                           (now, latest, json_body))
 
   # Check audience.
   if audience is not None:
@@ -372,6 +424,6 @@
       raise AppIdentityError('No aud field in token: %s' % json_body)
     if aud != audience:
       raise AppIdentityError('Wrong recipient, %s != %s: %s' %
-          (aud, audience, json_body))
+                             (aud, audience, json_body))
 
-  return parsed
+  return parsed
\ No newline at end of file
diff --git a/third_party/oauth2client/devshell.py b/third_party/oauth2client/devshell.py
new file mode 100644
index 0000000..69d3808
--- /dev/null
+++ b/third_party/oauth2client/devshell.py
@@ -0,0 +1,135 @@
+# Copyright 2015 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.
+
+"""OAuth 2.0 utitilies for Google Developer Shell environment."""
+
+import json
+import os
+
+from . import client
+
+
+DEVSHELL_ENV = 'DEVSHELL_CLIENT_PORT'
+
+
+class Error(Exception):
+  """Errors for this module."""
+  pass
+
+
+class CommunicationError(Error):
+  """Errors for communication with the Developer Shell server."""
+
+
+class NoDevshellServer(Error):
+  """Error when no Developer Shell server can be contacted."""
+
+
+# The request for credential information to the Developer Shell client socket is
+# always an empty PBLite-formatted JSON object, so just define it as a constant.
+CREDENTIAL_INFO_REQUEST_JSON = '[]'
+
+
+class CredentialInfoResponse(object):
+  """Credential information response from Developer Shell server.
+
+  The credential information response from Developer Shell socket is a
+  PBLite-formatted JSON array with fields encoded by their index in the array:
+  * Index 0 - user email
+  * Index 1 - default project ID. None if the project context is not known.
+  * Index 2 - OAuth2 access token. None if there is no valid auth context.
+  """
+
+  def __init__(self, json_string):
+    """Initialize the response data from JSON PBLite array."""
+    pbl = json.loads(json_string)
+    if not isinstance(pbl, list):
+      raise ValueError('Not a list: ' + str(pbl))
+    pbl_len = len(pbl)
+    self.user_email = pbl[0] if pbl_len > 0 else None
+    self.project_id = pbl[1] if pbl_len > 1 else None
+    self.access_token = pbl[2] if pbl_len > 2 else None
+
+
+def _SendRecv():
+  """Communicate with the Developer Shell server socket."""
+
+  port = int(os.getenv(DEVSHELL_ENV, 0))
+  if port == 0:
+    raise NoDevshellServer()
+
+  import socket
+
+  sock = socket.socket()
+  sock.connect(('localhost', port))
+
+  data = CREDENTIAL_INFO_REQUEST_JSON
+  msg = '%s\n%s' % (len(data), data)
+  sock.sendall(msg.encode())
+
+  header = sock.recv(6).decode()
+  if '\n' not in header:
+    raise CommunicationError('saw no newline in the first 6 bytes')
+  len_str, json_str = header.split('\n', 1)
+  to_read = int(len_str) - len(json_str)
+  if to_read > 0:
+    json_str += sock.recv(to_read, socket.MSG_WAITALL).decode()
+
+  return CredentialInfoResponse(json_str)
+
+
+class DevshellCredentials(client.GoogleCredentials):
+  """Credentials object for Google Developer Shell environment.
+
+  This object will allow a Google Developer Shell session to identify its user
+  to Google and other OAuth 2.0 servers that can verify assertions. It can be
+  used for the purpose of accessing data stored under the user account.
+
+  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.
+  """
+
+  def __init__(self, user_agent=None):
+    super(DevshellCredentials, self).__init__(
+        None,  # access_token, initialized below
+        None,  # client_id
+        None,  # client_secret
+        None,  # refresh_token
+        None,  # token_expiry
+        None,  # token_uri
+        user_agent)
+    self._refresh(None)
+
+  def _refresh(self, http_request):
+    self.devshell_response = _SendRecv()
+    self.access_token = self.devshell_response.access_token
+
+  @property
+  def user_email(self):
+    return self.devshell_response.user_email
+
+  @property
+  def project_id(self):
+    return self.devshell_response.project_id
+
+  @classmethod
+  def from_json(cls, json_data):
+    raise NotImplementedError(
+        'Cannot load Developer Shell credentials from JSON.')
+
+  @property
+  def serialization_data(self):
+    raise NotImplementedError(
+        'Cannot serialize Developer Shell credentials.')
diff --git a/third_party/oauth2client/django_orm.py b/third_party/oauth2client/django_orm.py
index d54d20c..ffbcf92 100644
--- a/third_party/oauth2client/django_orm.py
+++ b/third_party/oauth2client/django_orm.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2010 Google Inc.
+# 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.
@@ -116,14 +116,21 @@
         credential.set_store(self)
     return credential
 
-  def locked_put(self, credentials):
+  def locked_put(self, credentials, overwrite=False):
     """Write a Credentials to the datastore.
 
     Args:
       credentials: Credentials, the credentials to store.
+      overwrite: Boolean, indicates whether you would like these credentials to
+                          overwrite any existing stored credentials.
     """
     args = {self.key_name: self.key_value}
-    entity = self.model_class(**args)
+
+    if overwrite:
+      entity, unused_is_new = self.model_class.objects.get_or_create(**args)
+    else:
+      entity = self.model_class(**args)
+
     setattr(entity, self.property_name, credentials)
     entity.save()
 
@@ -131,4 +138,4 @@
     """Delete Credentials from the datastore."""
 
     query = {self.key_name: self.key_value}
-    entities = self.model_class.objects.filter(**query).delete()
+    entities = self.model_class.objects.filter(**query).delete()
\ No newline at end of file
diff --git a/third_party/oauth2client/file.py b/third_party/oauth2client/file.py
index 1895f94..4337fcf 100644
--- a/third_party/oauth2client/file.py
+++ b/third_party/oauth2client/file.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2010 Google Inc.
+# 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.
@@ -21,12 +21,10 @@
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
 import os
-import stat
 import threading
 
-from anyjson import simplejson
-from client import Storage as BaseStorage
 from client import Credentials
+from client import Storage as BaseStorage
 
 
 class CredentialsFileSymbolicLinkError(Exception):
@@ -92,7 +90,7 @@
     simple version of "touch" to ensure the file has been created.
     """
     if not os.path.exists(self._filename):
-      old_umask = os.umask(0177)
+      old_umask = os.umask(0o177)
       try:
         open(self._filename, 'a+b').close()
       finally:
@@ -110,7 +108,7 @@
 
     self._create_file_if_needed()
     self._validate_file()
-    f = open(self._filename, 'wb')
+    f = open(self._filename, 'w')
     f.write(credentials.to_json())
     f.close()
 
@@ -121,4 +119,4 @@
       credentials: Credentials, the credentials to store.
     """
 
-    os.unlink(self._filename)
+    os.unlink(self._filename)
\ No newline at end of file
diff --git a/third_party/oauth2client/gce.py b/third_party/oauth2client/gce.py
index c7fd7c1..ebd14e3 100644
--- a/third_party/oauth2client/gce.py
+++ b/third_party/oauth2client/gce.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2012 Google Inc.
+# 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.
@@ -19,14 +19,13 @@
 
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
-import httplib2
+import json
 import logging
-import uritemplate
+from third_party.six.moves import urllib
 
-from oauth2client import util
-from oauth2client.anyjson import simplejson
-from oauth2client.client import AccessTokenRefreshError
-from oauth2client.client import AssertionCredentials
+from third_party.oauth2client import util
+from third_party.oauth2client.client import AccessTokenRefreshError
+from third_party.oauth2client.client import AssertionCredentials
 
 logger = logging.getLogger(__name__)
 
@@ -57,13 +56,14 @@
         requested.
     """
     self.scope = util.scopes_to_string(scope)
+    self.kwargs = kwargs
 
     # 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)
+  def from_json(cls, json_data):
+    data = json.loads(json_data)
     return AppAssertionCredentials(data['scope'])
 
   def _refresh(self, http_request):
@@ -78,13 +78,28 @@
     Raises:
       AccessTokenRefreshError: When the refresh fails.
     """
-    uri = uritemplate.expand(META, {'scope': self.scope})
+    query = '?scope=%s' % urllib.parse.quote(self.scope, '')
+    uri = META.replace('{?scope}', query)
     response, content = http_request(uri)
     if response.status == 200:
       try:
-        d = simplejson.loads(content)
-      except StandardError, e:
+        d = json.loads(content)
+      except Exception as e:
         raise AccessTokenRefreshError(str(e))
       self.access_token = d['accessToken']
     else:
+      if response.status == 404:
+        content += (' This can occur if a VM was created'
+                    ' with no service account or scopes.')
       raise AccessTokenRefreshError(content)
+
+  @property
+  def serialization_data(self):
+    raise NotImplementedError(
+        'Cannot serialize credentials for GCE service accounts.')
+
+  def create_scoped_required(self):
+    return not self.scope
+
+  def create_scoped(self, scopes):
+    return AppAssertionCredentials(scopes, **self.kwargs)
\ No newline at end of file
diff --git a/third_party/oauth2client/keyring_storage.py b/third_party/oauth2client/keyring_storage.py
index efe2949..512ac77 100644
--- a/third_party/oauth2client/keyring_storage.py
+++ b/third_party/oauth2client/keyring_storage.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2012 Google Inc.
+# 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.
@@ -19,11 +19,12 @@
 
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 
-import keyring
 import threading
 
-from client import Storage as BaseStorage
+import keyring
+
 from client import Credentials
+from client import Storage as BaseStorage
 
 
 class Storage(BaseStorage):
@@ -106,4 +107,4 @@
     Args:
       credentials: Credentials, the credentials to store.
     """
-    keyring.set_password(self._service_name, self._user_name, '')
+    keyring.set_password(self._service_name, self._user_name, '')
\ No newline at end of file
diff --git a/third_party/oauth2client/locked_file.py b/third_party/oauth2client/locked_file.py
index 858b702..fa2c6c1 100644
--- a/third_party/oauth2client/locked_file.py
+++ b/third_party/oauth2client/locked_file.py
@@ -1,4 +1,4 @@
-# Copyright 2011 Google Inc.
+# 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.
@@ -17,17 +17,21 @@
 This module first tries to use fcntl locking to ensure serialized access
 to a file, then falls back on a lock file if that is unavialable.
 
-Usage:
+Usage::
+
     f = LockedFile('filename', 'r+b', 'rb')
     f.open_and_lock()
     if f.is_locked():
-      print 'Acquired filename with r+b mode'
+      print('Acquired filename with r+b mode')
       f.file_handle().write('locked data')
     else:
-      print 'Aquired filename with rb mode'
+      print('Acquired filename with rb mode')
     f.unlock_and_close()
+
 """
 
+from __future__ import print_function
+
 __author__ = 'cache@google.com (David T McWherter)'
 
 import errno
@@ -70,6 +74,7 @@
     self._mode = mode
     self._fallback_mode = fallback_mode
     self._fh = None
+    self._lock_fd = None
 
   def is_locked(self):
     """Was the file locked."""
@@ -122,7 +127,7 @@
     validate_file(self._filename)
     try:
       self._fh = open(self._filename, self._mode)
-    except IOError, e:
+    except IOError as e:
       # If we can't access with _mode, try _fallback_mode and don't lock.
       if e.errno == errno.EACCES:
         self._fh = open(self._filename, self._fallback_mode)
@@ -137,12 +142,12 @@
         self._locked = True
         break
 
-      except OSError, e:
+      except OSError as e:
         if e.errno != errno.EEXIST:
           raise
         if (time.time() - start_time) >= timeout:
-          logger.warn('Could not acquire lock %s in %s seconds' % (
-              lock_filename, timeout))
+          logger.warn('Could not acquire lock %s in %s seconds',
+                      lock_filename, timeout)
           # Close the file and open in fallback_mode.
           if self._fh:
             self._fh.close()
@@ -192,9 +197,9 @@
       validate_file(self._filename)
       try:
         self._fh = open(self._filename, self._mode)
-      except IOError, e:
+      except IOError as e:
         # If we can't access with _mode, try _fallback_mode and don't lock.
-        if e.errno == errno.EACCES:
+        if e.errno in (errno.EPERM, errno.EACCES):
           self._fh = open(self._filename, self._fallback_mode)
           return
 
@@ -204,16 +209,16 @@
           fcntl.lockf(self._fh.fileno(), fcntl.LOCK_EX)
           self._locked = True
           return
-        except IOError, e:
+        except IOError as e:
           # If not retrying, then just pass on the error.
           if timeout == 0:
-            raise e
+            raise
           if e.errno != errno.EACCES:
-            raise e
+            raise
           # We could not acquire the lock. Try again.
           if (time.time() - start_time) >= timeout:
-            logger.warn('Could not lock %s in %s seconds' % (
-                self._filename, timeout))
+            logger.warn('Could not lock %s in %s seconds',
+                        self._filename, timeout)
             if self._fh:
               self._fh.close()
             self._fh = open(self._filename, self._fallback_mode)
@@ -267,7 +272,7 @@
       validate_file(self._filename)
       try:
         self._fh = open(self._filename, self._mode)
-      except IOError, e:
+      except IOError as e:
         # If we can't access with _mode, try _fallback_mode and don't lock.
         if e.errno == errno.EACCES:
           self._fh = open(self._filename, self._fallback_mode)
@@ -284,9 +289,9 @@
               pywintypes.OVERLAPPED())
           self._locked = True
           return
-        except pywintypes.error, e:
+        except pywintypes.error as e:
           if timeout == 0:
-            raise e
+            raise
 
           # If the error is not that the file is already in use, raise.
           if e[0] != _Win32Opener.FILE_IN_USE_ERROR:
@@ -308,7 +313,7 @@
         try:
           hfile = win32file._get_osfhandle(self._fh.fileno())
           win32file.UnlockFileEx(hfile, 0, -0x10000, pywintypes.OVERLAPPED())
-        except pywintypes.error, e:
+        except pywintypes.error as e:
           if e[0] != _Win32Opener.FILE_ALREADY_UNLOCKED_ERROR:
             raise
       self._locked = False
@@ -370,4 +375,4 @@
 
   def unlock_and_close(self):
     """Unlock and close a file."""
-    self._opener.unlock_and_close()
+    self._opener.unlock_and_close()
\ No newline at end of file
diff --git a/third_party/oauth2client/multistore_file.py b/third_party/oauth2client/multistore_file.py
index ea89027..5008c00 100644
--- a/third_party/oauth2client/multistore_file.py
+++ b/third_party/oauth2client/multistore_file.py
@@ -1,4 +1,4 @@
-# Copyright 2011 Google Inc.
+# 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.
@@ -19,39 +19,41 @@
 both in a single process and across processes.
 
 The credential themselves are keyed off of:
+
 * client_id
 * user_agent
 * scope
 
-The format of the stored data is like so:
-{
-  'file_version': 1,
-  'data': [
-    {
-      'key': {
-        'clientId': '<client id>',
-        'userAgent': '<user agent>',
-        'scope': '<scope>'
-      },
-      'credential': {
-        # JSON serialized Credentials.
+The format of the stored data is like so::
+
+  {
+    'file_version': 1,
+    'data': [
+      {
+        'key': {
+          'clientId': '<client id>',
+          'userAgent': '<user agent>',
+          'scope': '<scope>'
+        },
+        'credential': {
+          # JSON serialized Credentials.
+        }
       }
-    }
-  ]
-}
+    ]
+  }
+
 """
 
 __author__ = 'jbeda@google.com (Joe Beda)'
 
-import base64
 import errno
+import json
 import logging
 import os
 import threading
 
-from anyjson import simplejson
-from .client import Storage as BaseStorage
 from .client import Credentials
+from .client import Storage as BaseStorage
 from . import util
 from locked_file import LockedFile
 
@@ -64,12 +66,10 @@
 
 class Error(Exception):
   """Base error for this module."""
-  pass
 
 
 class NewerCredentialStoreError(Error):
-  """The credential store is a newer version that supported."""
-  pass
+  """The credential store is a newer version than supported."""
 
 
 @util.positional(4)
@@ -193,7 +193,7 @@
 
     This will create the file if necessary.
     """
-    self._file = LockedFile(filename, 'r+b', 'rb')
+    self._file = LockedFile(filename, 'r+', 'r')
     self._thread_lock = threading.Lock()
     self._read_only = False
     self._warn_on_readonly = warn_on_readonly
@@ -271,7 +271,7 @@
     simple version of "touch" to ensure the file has been created.
     """
     if not os.path.exists(self._file.filename()):
-      old_umask = os.umask(0177)
+      old_umask = os.umask(0o177)
       try:
         open(self._file.filename(), 'a+b').close()
       finally:
@@ -280,13 +280,23 @@
   def _lock(self):
     """Lock the entire multistore."""
     self._thread_lock.acquire()
-    self._file.open_and_lock()
+    try:
+      self._file.open_and_lock()
+    except IOError as e:
+      if e.errno == errno.ENOSYS:
+        logger.warn('File system does not support locking the credentials '
+                    'file.')
+      elif e.errno ==  errno.ENOLCK:
+        logger.warn('File system is out of resources for writing the '
+                    'credentials file (is your disk full?).')
+      else:
+        raise
     if not self._file.is_locked():
       self._read_only = True
       if self._warn_on_readonly:
         logger.warn('The credentials file (%s) is not writable. Opening in '
                     'read-only mode. Any refreshed credentials will only be '
-                    'valid for this run.' % self._file.filename())
+                    'valid for this run.', self._file.filename())
     if os.path.getsize(self._file.filename()) == 0:
       logger.debug('Initializing empty multistore file')
       # The multistore is empty so write out an empty file.
@@ -315,7 +325,7 @@
     """
     assert self._thread_lock.locked()
     self._file.file_handle().seek(0)
-    return simplejson.load(self._file.file_handle())
+    return json.load(self._file.file_handle())
 
   def _locked_json_write(self, data):
     """Write a JSON serializable data structure to the multistore.
@@ -329,7 +339,7 @@
     if self._read_only:
       return
     self._file.file_handle().seek(0)
-    simplejson.dump(data, self._file.file_handle(), sort_keys=True, indent=2)
+    json.dump(data, self._file.file_handle(), sort_keys=True, indent=2, separators=(',', ': '))
     self._file.file_handle().truncate()
 
   def _refresh_data_cache(self):
@@ -387,7 +397,7 @@
     raw_key = cred_entry['key']
     key = util.dict_to_tuple_key(raw_key)
     credential = None
-    credential = Credentials.new_from_json(simplejson.dumps(cred_entry['credential']))
+    credential = Credentials.new_from_json(json.dumps(cred_entry['credential']))
     return (key, credential)
 
   def _write(self):
@@ -400,7 +410,7 @@
     raw_data['data'] = raw_creds
     for (cred_key, cred) in self._data.items():
       raw_key = dict(cred_key)
-      raw_cred = simplejson.loads(cred.to_json())
+      raw_cred = json.loads(cred.to_json())
       raw_creds.append({'key': raw_key, 'credential': raw_cred})
     self._locked_json_write(raw_data)
 
@@ -462,4 +472,4 @@
     Returns:
       A Storage object that can be used to get/set this cred
     """
-    return self._Storage(self, key)
+    return self._Storage(self, key)
\ No newline at end of file
diff --git a/third_party/oauth2client/old_run.py b/third_party/oauth2client/old_run.py
index da23358..221fff8 100644
--- a/third_party/oauth2client/old_run.py
+++ b/third_party/oauth2client/old_run.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2013 Google Inc.
+# 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.
@@ -15,6 +15,7 @@
 """This module holds the old run() function which is deprecated, the
 tools.run_flow() function should be used in its place."""
 
+from __future__ import print_function
 
 import logging
 import socket
@@ -22,9 +23,9 @@
 import webbrowser
 
 import gflags
-
-from oauth2client import client
-from oauth2client import util
+from third_party.six.moves import input
+from third_party.oauth2client import client
+from third_party.oauth2client import util
 from tools import ClientRedirectHandler
 from tools import ClientRedirectServer
 
@@ -48,39 +49,38 @@
 def run(flow, storage, http=None):
   """Core code for a command-line application.
 
-  The run() function is called from your application and runs through all
-  the steps to obtain credentials. It takes a Flow argument and attempts to
-  open an authorization server page in the user's default web browser. The
-  server asks the user to grant your application access to the user's data.
-  If the user grants access, the run() function returns new credentials. The
-  new credentials are also stored in the Storage argument, which updates the
-  file associated with the Storage object.
+  The ``run()`` function is called from your application and runs
+  through all the steps to obtain credentials. It takes a ``Flow``
+  argument and attempts to open an authorization server page in the
+  user's default web browser. The server asks the user to grant your
+  application access to the user's data. If the user grants access,
+  the ``run()`` function returns new credentials. The new credentials
+  are also stored in the ``storage`` argument, which updates the file
+  associated with the ``Storage`` object.
 
   It presumes it is run from a command-line application and supports the
   following flags:
 
-    --auth_host_name: Host name to use when running a local web server
-      to handle redirects during OAuth authorization.
-      (default: 'localhost')
+    ``--auth_host_name`` (string, default: ``localhost``)
+       Host name to use when running a local web server to handle
+       redirects during OAuth authorization.
 
-    --auth_host_port: Port to use when running a local web server to handle
-    redirects during OAuth authorization.;
-      repeat this option to specify a list of values
-      (default: '[8080, 8090]')
-      (an integer)
+    ``--auth_host_port`` (integer, default: ``[8080, 8090]``)
+       Port to use when running a local web server to handle redirects
+       during OAuth authorization. Repeat this option to specify a list
+       of values.
 
-    --[no]auth_local_webserver: Run a local web server to handle redirects
-      during OAuth authorization.
-      (default: 'true')
+    ``--[no]auth_local_webserver`` (boolean, default: ``True``)
+       Run a local web server to handle redirects during OAuth authorization.
 
-  Since it uses flags make sure to initialize the gflags module before
-  calling run().
+  Since it uses flags make sure to initialize the ``gflags`` module before
+  calling ``run()``.
 
   Args:
     flow: Flow, an OAuth 2.0 Flow to step through.
-    storage: Storage, a Storage to store the credential in.
-    http: An instance of httplib2.Http.request
-         or something that acts like it.
+    storage: Storage, a ``Storage`` to store the credential in.
+    http: An instance of ``httplib2.Http.request`` or something that acts
+        like it.
 
   Returns:
     Credentials, the obtained credential.
@@ -96,20 +96,20 @@
       try:
         httpd = ClientRedirectServer((FLAGS.auth_host_name, port),
                                      ClientRedirectHandler)
-      except socket.error, e:
+      except socket.error as e:
         pass
       else:
         success = True
         break
     FLAGS.auth_local_webserver = success
     if not success:
-      print 'Failed to start a local webserver listening on either port 8080'
-      print 'or port 9090. Please check your firewall settings and locally'
-      print 'running programs that may be blocking or using those ports.'
-      print
-      print 'Falling back to --noauth_local_webserver and continuing with',
-      print 'authorization.'
-      print
+      print('Failed to start a local webserver listening on either port 8080')
+      print('or port 9090. Please check your firewall settings and locally')
+      print('running programs that may be blocking or using those ports.')
+      print()
+      print('Falling back to --noauth_local_webserver and continuing with')
+      print('authorization.')
+      print()
 
   if FLAGS.auth_local_webserver:
     oauth_callback = 'http://%s:%s/' % (FLAGS.auth_host_name, port_number)
@@ -120,20 +120,20 @@
 
   if FLAGS.auth_local_webserver:
     webbrowser.open(authorize_url, new=1, autoraise=True)
-    print 'Your browser has been opened to visit:'
-    print
-    print '    ' + authorize_url
-    print
-    print 'If your browser is on a different machine then exit and re-run'
-    print 'this application with the command-line parameter '
-    print
-    print '  --noauth_local_webserver'
-    print
+    print('Your browser has been opened to visit:')
+    print()
+    print('    ' + authorize_url)
+    print()
+    print('If your browser is on a different machine then exit and re-run')
+    print('this application with the command-line parameter ')
+    print()
+    print('  --noauth_local_webserver')
+    print()
   else:
-    print 'Go to the following link in your browser:'
-    print
-    print '    ' + authorize_url
-    print
+    print('Go to the following link in your browser:')
+    print()
+    print('    ' + authorize_url)
+    print()
 
   code = None
   if FLAGS.auth_local_webserver:
@@ -143,18 +143,18 @@
     if 'code' in httpd.query_params:
       code = httpd.query_params['code']
     else:
-      print 'Failed to find "code" in the query parameters of the redirect.'
+      print('Failed to find "code" in the query parameters of the redirect.')
       sys.exit('Try running with --noauth_local_webserver.')
   else:
-    code = raw_input('Enter verification code: ').strip()
+    code = input('Enter verification code: ').strip()
 
   try:
     credential = flow.step2_exchange(code, http=http)
-  except client.FlowExchangeError, e:
+  except client.FlowExchangeError as e:
     sys.exit('Authentication has failed: %s' % e)
 
   storage.put(credential)
   credential.set_store(storage)
-  print 'Authentication successful.'
+  print('Authentication successful.')
 
-  return credential
+  return credential
\ No newline at end of file
diff --git a/third_party/oauth2client/service_account.py b/third_party/oauth2client/service_account.py
new file mode 100644
index 0000000..b6b694c
--- /dev/null
+++ b/third_party/oauth2client/service_account.py
@@ -0,0 +1,139 @@
+# 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.
+
+"""A service account credentials class.
+
+This credentials class is implemented on top of rsa library.
+"""
+
+import base64
+import json
+import time
+
+from pyasn1.codec.ber import decoder
+from pyasn1_modules.rfc5208 import PrivateKeyInfo
+import rsa
+
+from . import GOOGLE_REVOKE_URI
+from . import GOOGLE_TOKEN_URI
+from . import util
+from client import AssertionCredentials
+from third_party import six
+
+
+class _ServiceAccountCredentials(AssertionCredentials):
+  """Class representing a service account (signed JWT) credential."""
+
+  MAX_TOKEN_LIFETIME_SECS = 3600 # 1 hour in seconds
+
+  def __init__(self, service_account_id, service_account_email, private_key_id,
+               private_key_pkcs8_text, scopes, user_agent=None,
+               token_uri=GOOGLE_TOKEN_URI, revoke_uri=GOOGLE_REVOKE_URI,
+               **kwargs):
+
+    super(_ServiceAccountCredentials, self).__init__(
+        None, user_agent=user_agent, token_uri=token_uri, revoke_uri=revoke_uri)
+
+    self._service_account_id = service_account_id
+    self._service_account_email = service_account_email
+    self._private_key_id = private_key_id
+    self._private_key = _get_private_key(private_key_pkcs8_text)
+    self._private_key_pkcs8_text = private_key_pkcs8_text
+    self._scopes = util.scopes_to_string(scopes)
+    self._user_agent = user_agent
+    self._token_uri = token_uri
+    self._revoke_uri = revoke_uri
+    self._kwargs = kwargs
+
+  def _generate_assertion(self):
+    """Generate the assertion that will be used in the request."""
+
+    header = {
+        'alg': 'RS256',
+        'typ': 'JWT',
+        'kid': self._private_key_id
+    }
+
+    now = int(time.time())
+    payload = {
+        'aud': self._token_uri,
+        'scope': self._scopes,
+        'iat': now,
+        'exp': now + _ServiceAccountCredentials.MAX_TOKEN_LIFETIME_SECS,
+        'iss': self._service_account_email
+    }
+    payload.update(self._kwargs)
+
+    assertion_input = (_urlsafe_b64encode(header) + b'.' +
+                       _urlsafe_b64encode(payload))
+
+    # Sign the assertion.
+    rsa_bytes = rsa.pkcs1.sign(assertion_input, self._private_key, 'SHA-256')
+    signature = base64.urlsafe_b64encode(rsa_bytes).rstrip(b'=')
+
+    return assertion_input + b'.' + signature
+
+  def sign_blob(self, blob):
+    # Ensure that it is bytes
+    try:
+      blob = blob.encode('utf-8')
+    except AttributeError:
+      pass
+    return (self._private_key_id,
+            rsa.pkcs1.sign(blob, self._private_key, 'SHA-256'))
+
+  @property
+  def service_account_email(self):
+    return self._service_account_email
+
+  @property
+  def serialization_data(self):
+    return {
+        'type': 'service_account',
+        'client_id': self._service_account_id,
+        'client_email': self._service_account_email,
+        'private_key_id': self._private_key_id,
+        'private_key': self._private_key_pkcs8_text
+    }
+
+  def create_scoped_required(self):
+    return not self._scopes
+
+  def create_scoped(self, scopes):
+    return _ServiceAccountCredentials(self._service_account_id,
+                                      self._service_account_email,
+                                      self._private_key_id,
+                                      self._private_key_pkcs8_text,
+                                      scopes,
+                                      user_agent=self._user_agent,
+                                      token_uri=self._token_uri,
+                                      revoke_uri=self._revoke_uri,
+                                      **self._kwargs)
+
+
+def _urlsafe_b64encode(data):
+  return base64.urlsafe_b64encode(
+      json.dumps(data, separators=(',', ':')).encode('UTF-8')).rstrip(b'=')
+
+
+def _get_private_key(private_key_pkcs8_text):
+  """Get an RSA private key object from a pkcs8 representation."""
+
+  if not isinstance(private_key_pkcs8_text, six.binary_type):
+    private_key_pkcs8_text = private_key_pkcs8_text.encode('ascii')
+  der = rsa.pem.load_pem(private_key_pkcs8_text, 'PRIVATE KEY')
+  asn1_private_key, _ = decoder.decode(der, asn1Spec=PrivateKeyInfo())
+  return rsa.PrivateKey.load_pkcs1(
+      asn1_private_key.getComponentByName('privateKey').asOctets(),
+      format='DER')
\ No newline at end of file
diff --git a/third_party/oauth2client/tools.py b/third_party/oauth2client/tools.py
index 12c68bf..3df1bbe 100644
--- a/third_party/oauth2client/tools.py
+++ b/third_party/oauth2client/tools.py
@@ -1,4 +1,4 @@
-# Copyright (C) 2013 Google Inc.
+# 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.
@@ -19,27 +19,22 @@
 the same directory.
 """
 
+from __future__ import print_function
+
 __author__ = 'jcgregorio@google.com (Joe Gregorio)'
 __all__ = ['argparser', 'run_flow', 'run', 'message_if_missing']
 
-
-import BaseHTTPServer
-import argparse
-import httplib2
 import logging
-import os
 import socket
 import sys
-import webbrowser
 
-from oauth2client import client
-from oauth2client import file
-from oauth2client import util
+from third_party.six.moves import BaseHTTPServer
+from third_party.six.moves import urllib
+from third_party.six.moves import input
 
-try:
-  from urlparse import parse_qsl
-except ImportError:
-  from cgi import parse_qsl
+from . import client
+from . import util
+
 
 _CLIENT_SECRETS_MESSAGE = """WARNING: Please configure OAuth 2.0
 
@@ -52,20 +47,27 @@
 
 """
 
-# run_parser is an ArgumentParser that contains command-line options expected
+def _CreateArgumentParser():
+  try:
+    import argparse
+  except ImportError:
+    return None
+  parser = argparse.ArgumentParser(add_help=False)
+  parser.add_argument('--auth_host_name', default='localhost',
+                      help='Hostname when running a local web server.')
+  parser.add_argument('--noauth_local_webserver', action='store_true',
+                      default=False, help='Do not run a local web server.')
+  parser.add_argument('--auth_host_port', default=[8080, 8090], type=int,
+                      nargs='*', help='Port web server should listen on.')
+  parser.add_argument('--logging_level', default='ERROR',
+                      choices=['DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL'],
+                      help='Set the logging level of detail.')
+  return parser
+
+# argparser is an ArgumentParser that contains command-line options expected
 # by tools.run(). Pass it in as part of the 'parents' argument to your own
 # ArgumentParser.
-argparser = argparse.ArgumentParser(add_help=False)
-argparser.add_argument('--auth_host_name', default='localhost',
-                        help='Hostname when running a local web server.')
-argparser.add_argument('--noauth_local_webserver', action='store_true',
-                        default=False, help='Do not run a local web server.')
-argparser.add_argument('--auth_host_port', default=[8080, 8090], type=int,
-                        nargs='*', help='Port web server should listen on.')
-argparser.add_argument('--logging_level', default='ERROR',
-                        choices=['DEBUG', 'INFO', 'WARNING', 'ERROR',
-                                 'CRITICAL'],
-                        help='Set the logging level of detail.')
+argparser = _CreateArgumentParser()
 
 
 class ClientRedirectServer(BaseHTTPServer.HTTPServer):
@@ -84,72 +86,75 @@
   into the servers query_params and then stops serving.
   """
 
-  def do_GET(s):
+  def do_GET(self):
     """Handle a GET request.
 
     Parses the query parameters and prints a message
     if the flow has completed. Note that we can't detect
     if an error occurred.
     """
-    s.send_response(200)
-    s.send_header("Content-type", "text/html")
-    s.end_headers()
-    query = s.path.split('?', 1)[-1]
-    query = dict(parse_qsl(query))
-    s.server.query_params = query
-    s.wfile.write("<html><head><title>Authentication Status</title></head>")
-    s.wfile.write("<body><p>The authentication flow has completed.</p>")
-    s.wfile.write("</body></html>")
+    self.send_response(200)
+    self.send_header("Content-type", "text/html")
+    self.end_headers()
+    query = self.path.split('?', 1)[-1]
+    query = dict(urllib.parse.parse_qsl(query))
+    self.server.query_params = query
+    self.wfile.write(b"<html><head><title>Authentication Status</title></head>")
+    self.wfile.write(b"<body><p>The authentication flow has completed.</p>")
+    self.wfile.write(b"</body></html>")
 
   def log_message(self, format, *args):
     """Do not log messages to stdout while running as command line program."""
-    pass
 
 
 @util.positional(3)
 def run_flow(flow, storage, flags, http=None):
   """Core code for a command-line application.
 
-  The run() function is called from your application and runs through all the
-  steps to obtain credentials. It takes a Flow argument and attempts to open an
-  authorization server page in the user's default web browser. The server asks
-  the user to grant your application access to the user's data. If the user
-  grants access, the run() function returns new credentials. The new credentials
-  are also stored in the Storage argument, which updates the file associated
-  with the Storage object.
+  The ``run()`` function is called from your application and runs
+  through all the steps to obtain credentials. It takes a ``Flow``
+  argument and attempts to open an authorization server page in the
+  user's default web browser. The server asks the user to grant your
+  application access to the user's data. If the user grants access,
+  the ``run()`` function returns new credentials. The new credentials
+  are also stored in the ``storage`` argument, which updates the file
+  associated with the ``Storage`` object.
 
   It presumes it is run from a command-line application and supports the
   following flags:
 
-    --auth_host_name: Host name to use when running a local web server
-      to handle redirects during OAuth authorization.
-      (default: 'localhost')
+    ``--auth_host_name`` (string, default: ``localhost``)
+       Host name to use when running a local web server to handle
+       redirects during OAuth authorization.
 
-    --auth_host_port: Port to use when running a local web server to handle
-      redirects during OAuth authorization.;
-      repeat this option to specify a list of values
-      (default: '[8080, 8090]')
-      (an integer)
+    ``--auth_host_port`` (integer, default: ``[8080, 8090]``)
+       Port to use when running a local web server to handle redirects
+       during OAuth authorization. Repeat this option to specify a list
+       of values.
 
-    --[no]auth_local_webserver: Run a local web server to handle redirects
-      during OAuth authorization.
-      (default: 'true')
+    ``--[no]auth_local_webserver`` (boolean, default: ``True``)
+       Run a local web server to handle redirects during OAuth authorization.
 
-  The tools module defines an ArgumentParser the already contains the flag
-  definitions that run() requires. You can pass that ArgumentParser to your
-  ArgumentParser constructor:
 
-    parser = argparse.ArgumentParser(description=__doc__,
-        formatter_class=argparse.RawDescriptionHelpFormatter,
-        parents=[tools.run_parser])
-    flags = parser.parse_args(argv)
+
+
+  The tools module defines an ``ArgumentParser`` the already contains the flag
+  definitions that ``run()`` requires. You can pass that ``ArgumentParser`` to your
+  ``ArgumentParser`` constructor::
+
+      parser = argparse.ArgumentParser(description=__doc__,
+          formatter_class=argparse.RawDescriptionHelpFormatter,
+          parents=[tools.argparser])
+      flags = parser.parse_args(argv)
 
   Args:
     flow: Flow, an OAuth 2.0 Flow to step through.
-    storage: Storage, a Storage to store the credential in.
-    flags: argparse.ArgumentParser, the command-line flags.
-    http: An instance of httplib2.Http.request
-         or something that acts like it.
+    storage: Storage, a ``Storage`` to store the credential in.
+    flags: ``argparse.Namespace``, The command-line flags. This is the
+        object returned from calling ``parse_args()`` on
+        ``argparse.ArgumentParser`` as described above.
+    http: An instance of ``httplib2.Http.request`` or something that
+        acts like it.
 
   Returns:
     Credentials, the obtained credential.
@@ -163,20 +168,20 @@
       try:
         httpd = ClientRedirectServer((flags.auth_host_name, port),
                                      ClientRedirectHandler)
-      except socket.error, e:
+      except socket.error:
         pass
       else:
         success = True
         break
     flags.noauth_local_webserver = not success
     if not success:
-      print 'Failed to start a local webserver listening on either port 8080'
-      print 'or port 9090. Please check your firewall settings and locally'
-      print 'running programs that may be blocking or using those ports.'
-      print
-      print 'Falling back to --noauth_local_webserver and continuing with',
-      print 'authorization.'
-      print
+      print('Failed to start a local webserver listening on either port 8080')
+      print('or port 9090. Please check your firewall settings and locally')
+      print('running programs that may be blocking or using those ports.')
+      print()
+      print('Falling back to --noauth_local_webserver and continuing with')
+      print('authorization.')
+      print()
 
   if not flags.noauth_local_webserver:
     oauth_callback = 'http://%s:%s/' % (flags.auth_host_name, port_number)
@@ -186,21 +191,22 @@
   authorize_url = flow.step1_get_authorize_url()
 
   if not flags.noauth_local_webserver:
+    import webbrowser
     webbrowser.open(authorize_url, new=1, autoraise=True)
-    print 'Your browser has been opened to visit:'
-    print
-    print '    ' + authorize_url
-    print
-    print 'If your browser is on a different machine then exit and re-run this'
-    print 'application with the command-line parameter '
-    print
-    print '  --noauth_local_webserver'
-    print
+    print('Your browser has been opened to visit:')
+    print()
+    print('    ' + authorize_url)
+    print()
+    print('If your browser is on a different machine then exit and re-run this')
+    print('application with the command-line parameter ')
+    print()
+    print('  --noauth_local_webserver')
+    print()
   else:
-    print 'Go to the following link in your browser:'
-    print
-    print '    ' + authorize_url
-    print
+    print('Go to the following link in your browser:')
+    print()
+    print('    ' + authorize_url)
+    print()
 
   code = None
   if not flags.noauth_local_webserver:
@@ -210,19 +216,19 @@
     if 'code' in httpd.query_params:
       code = httpd.query_params['code']
     else:
-      print 'Failed to find "code" in the query parameters of the redirect.'
+      print('Failed to find "code" in the query parameters of the redirect.')
       sys.exit('Try running with --noauth_local_webserver.')
   else:
-    code = raw_input('Enter verification code: ').strip()
+    code = input('Enter verification code: ').strip()
 
   try:
     credential = flow.step2_exchange(code, http=http)
-  except client.FlowExchangeError, e:
+  except client.FlowExchangeError as e:
     sys.exit('Authentication has failed: %s' % e)
 
   storage.put(credential)
   credential.set_store(storage)
-  print 'Authentication successful.'
+  print('Authentication successful.')
 
   return credential
 
@@ -233,11 +239,11 @@
   return _CLIENT_SECRETS_MESSAGE % filename
 
 try:
-  from old_run import run
-  from old_run import FLAGS
+  from oauth2client.old_run import run
+  from oauth2client.old_run import FLAGS
 except ImportError:
   def run(*args, **kwargs):
     raise NotImplementedError(
         'The gflags library must be installed to use tools.run(). '
         'Please install gflags or preferrably switch to using '
-        'tools.run_flow().')
+        'tools.run_flow().')
\ No newline at end of file
diff --git a/third_party/oauth2client/util.py b/third_party/oauth2client/util.py
index 90dff15..b0963ef 100644
--- a/third_party/oauth2client/util.py
+++ b/third_party/oauth2client/util.py
@@ -1,6 +1,6 @@
 #!/usr/bin/env python
 #
-# Copyright 2010 Google Inc.
+# 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.
@@ -17,26 +17,27 @@
 
 """Common utility library."""
 
-__author__ = ['rafek@google.com (Rafe Kaplan)',
-              'guido@google.com (Guido van Rossum)',
-]
-__all__ = [
-  'positional',
-  'POSITIONAL_WARNING',
-  'POSITIONAL_EXCEPTION',
-  'POSITIONAL_IGNORE',
+__author__ = [
+    'rafek@google.com (Rafe Kaplan)',
+    'guido@google.com (Guido van Rossum)',
 ]
 
+__all__ = [
+    'positional',
+    'POSITIONAL_WARNING',
+    'POSITIONAL_EXCEPTION',
+    'POSITIONAL_IGNORE',
+]
+
+import functools
 import inspect
 import logging
+import sys
 import types
-import urllib
-import urlparse
 
-try:
-  from urlparse import parse_qsl
-except ImportError:
-  from cgi import parse_qsl
+from third_party import six
+from third_party.six.moves import urllib
+
 
 logger = logging.getLogger(__name__)
 
@@ -51,56 +52,58 @@
 def positional(max_positional_args):
   """A decorator to declare that only the first N arguments my be positional.
 
-  This decorator makes it easy to support Python 3 style key-word only
-  parameters. For example, in Python 3 it is possible to write:
+  This decorator makes it easy to support Python 3 style keyword-only
+  parameters. For example, in Python 3 it is possible to write::
 
     def fn(pos1, *, kwonly1=None, kwonly1=None):
       ...
 
-  All named parameters after * must be a keyword:
+  All named parameters after ``*`` must be a keyword::
 
     fn(10, 'kw1', 'kw2')  # Raises exception.
     fn(10, kwonly1='kw1')  # Ok.
 
-  Example:
-    To define a function like above, do:
+  Example
+  ^^^^^^^
 
-      @positional(1)
-      def fn(pos1, kwonly1=None, kwonly2=None):
+  To define a function like above, do::
+
+    @positional(1)
+    def fn(pos1, kwonly1=None, kwonly2=None):
+      ...
+
+  If no default value is provided to a keyword argument, it becomes a required
+  keyword argument::
+
+    @positional(0)
+    def fn(required_kw):
+      ...
+
+  This must be called with the keyword parameter::
+
+    fn()  # Raises exception.
+    fn(10)  # Raises exception.
+    fn(required_kw=10)  # Ok.
+
+  When defining instance or class methods always remember to account for
+  ``self`` and ``cls``::
+
+    class MyClass(object):
+
+      @positional(2)
+      def my_method(self, pos1, kwonly1=None):
         ...
 
-    If no default value is provided to a keyword argument, it becomes a required
-    keyword argument:
-
-      @positional(0)
-      def fn(required_kw):
+      @classmethod
+      @positional(2)
+      def my_method(cls, pos1, kwonly1=None):
         ...
 
-    This must be called with the keyword parameter:
-
-      fn()  # Raises exception.
-      fn(10)  # Raises exception.
-      fn(required_kw=10)  # Ok.
-
-    When defining instance or class methods always remember to account for
-    'self' and 'cls':
-
-      class MyClass(object):
-
-        @positional(2)
-        def my_method(self, pos1, kwonly1=None):
-          ...
-
-        @classmethod
-        @positional(2)
-        def my_method(cls, pos1, kwonly1=None):
-          ...
-
   The positional decorator behavior is controlled by
-  util.positional_parameters_enforcement, which may be set to
-  POSITIONAL_EXCEPTION, POSITIONAL_WARNING or POSITIONAL_IGNORE to raise an
-  exception, log a warning, or do nothing, respectively, if a declaration is
-  violated.
+  ``util.positional_parameters_enforcement``, which may be set to
+  ``POSITIONAL_EXCEPTION``, ``POSITIONAL_WARNING`` or
+  ``POSITIONAL_IGNORE`` to raise an exception, log a warning, or do
+  nothing, respectively, if a declaration is violated.
 
   Args:
     max_positional_arguments: Maximum number of positional arguments. All
@@ -114,8 +117,10 @@
     TypeError if a key-word only argument is provided as a positional
     parameter, but only if util.positional_parameters_enforcement is set to
     POSITIONAL_EXCEPTION.
+
   """
   def positional_decorator(wrapped):
+    @functools.wraps(wrapped)
     def positional_wrapper(*args, **kwargs):
       if len(args) > max_positional_args:
         plural_s = ''
@@ -132,7 +137,7 @@
       return wrapped(*args, **kwargs)
     return positional_wrapper
 
-  if isinstance(max_positional_args, (int, long)):
+  if isinstance(max_positional_args, six.integer_types):
     return positional_decorator
   else:
     args, _, _, defaults = inspect.getargspec(max_positional_args)
@@ -152,7 +157,7 @@
   Returns:
     The scopes formatted as a single string.
   """
-  if isinstance(scopes, types.StringTypes):
+  if isinstance(scopes, six.string_types):
     return scopes
   else:
     return ' '.join(scopes)
@@ -189,8 +194,8 @@
   if value is None:
     return url
   else:
-    parsed = list(urlparse.urlparse(url))
-    q = dict(parse_qsl(parsed[4]))
+    parsed = list(urllib.parse.urlparse(url))
+    q = dict(urllib.parse.parse_qsl(parsed[4]))
     q[name] = value
-    parsed[4] = urllib.urlencode(q)
-    return urlparse.urlunparse(parsed)
+    parsed[4] = urllib.parse.urlencode(q)
+    return urllib.parse.urlunparse(parsed)
\ No newline at end of file
diff --git a/third_party/oauth2client/xsrfutil.py b/third_party/oauth2client/xsrfutil.py
index 7e1fe5c..bea7c87 100644
--- a/third_party/oauth2client/xsrfutil.py
+++ b/third_party/oauth2client/xsrfutil.py
@@ -1,6 +1,5 @@
-#!/usr/bin/python2.5
 #
-# Copyright 2010 the Melange authors.
+# Copyright 2014 the Melange authors.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -17,25 +16,36 @@
 """Helper methods for creating & verifying XSRF tokens."""
 
 __authors__ = [
-  '"Doug Coker" <dcoker@google.com>',
-  '"Joe Gregorio" <jcgregorio@google.com>',
+    '"Doug Coker" <dcoker@google.com>',
+    '"Joe Gregorio" <jcgregorio@google.com>',
 ]
 
 
 import base64
 import hmac
-import os  # for urandom
 import time
 
+import six
 from oauth2client import util
 
 
 # Delimiter character
-DELIMITER = ':'
+DELIMITER = b':'
+
 
 # 1 hour in seconds
 DEFAULT_TIMEOUT_SECS = 1*60*60
 
+
+def _force_bytes(s):
+    if isinstance(s, bytes):
+        return s
+    s = str(s)
+    if isinstance(s, six.text_type):
+        return s.encode('utf-8')
+    return s
+
+
 @util.positional(2)
 def generate_token(key, user_id, action_id="", when=None):
   """Generates a URL-safe token for the given user, action, time tuple.
@@ -51,18 +61,16 @@
   Returns:
     A string XSRF protection token.
   """
-  when = when or int(time.time())
-  digester = hmac.new(key)
-  digester.update(str(user_id))
+  when = _force_bytes(when or int(time.time()))
+  digester = hmac.new(_force_bytes(key))
+  digester.update(_force_bytes(user_id))
   digester.update(DELIMITER)
-  digester.update(action_id)
+  digester.update(_force_bytes(action_id))
   digester.update(DELIMITER)
-  digester.update(str(when))
+  digester.update(when)
   digest = digester.digest()
 
-  token = base64.urlsafe_b64encode('%s%s%d' % (digest,
-                                               DELIMITER,
-                                               when))
+  token = base64.urlsafe_b64encode(digest + DELIMITER + when)
   return token
 
 
@@ -87,8 +95,8 @@
   if not token:
     return False
   try:
-    decoded = base64.urlsafe_b64decode(str(token))
-    token_time = long(decoded.split(DELIMITER)[-1])
+    decoded = base64.urlsafe_b64decode(token)
+    token_time = int(decoded.split(DELIMITER)[-1])
   except (TypeError, ValueError):
     return False
   if current_time is None:
@@ -105,9 +113,6 @@
 
   # Perform constant time comparison to avoid timing attacks
   different = 0
-  for x, y in zip(token, expected_token):
-    different |= ord(x) ^ ord(y)
-  if different:
-    return False
-
-  return True
+  for x, y in zip(bytearray(token), bytearray(expected_token)):
+    different |= x ^ y
+  return not different
\ No newline at end of file