Revert "Add gsutil 4.13 to telemetry/third_party"

tools/telemetry/third_party/gsutil/third_party/oauth2client/oauth2client/client.py

Index: tools/telemetry/third_party/gsutil/third_party/oauth2client/oauth2client/client.py
diff --git a/tools/telemetry/third_party/gsutil/third_party/oauth2client/oauth2client/client.py b/tools/telemetry/third_party/gsutil/third_party/oauth2client/oauth2client/client.py
deleted file mode 100644
index 8108bd86e21bcfa5b5b9ec477f9b172bda7e56d2..0000000000000000000000000000000000000000
--- a/tools/telemetry/third_party/gsutil/third_party/oauth2client/oauth2client/client.py
+++ /dev/null
@@ -1,2077 +0,0 @@
-# Copyright 2014 Google Inc. All rights reserved.
-#
-# Licensed under the Apache License, Version 2.0 (the "License");
-# you may not use this file except in compliance with the License.
-# You may obtain a copy of the License at
-#
-#      http://www.apache.org/licenses/LICENSE-2.0
-#
-# Unless required by applicable law or agreed to in writing, software
-# distributed under the License is distributed on an "AS IS" BASIS,
-# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-# See the License for the specific language governing permissions and
-# limitations under the License.
-
-"""An OAuth 2.0 client.
-
-Tools for interacting with OAuth 2.0 protected resources.
-"""
-
-__author__ = 'jcgregorio@google.com (Joe Gregorio)'
-
-import base64
-import collections
-import copy
-import datetime
-import json
-import logging
-import os
-import socket
-import sys
-import tempfile
-import time
-import shutil
-import six
-from six.moves import urllib
-
-import httplib2
-from oauth2client import clientsecrets
-from oauth2client import GOOGLE_AUTH_URI
-from oauth2client import GOOGLE_DEVICE_URI
-from oauth2client import GOOGLE_REVOKE_URI
-from oauth2client import GOOGLE_TOKEN_URI
-from oauth2client import util
-
-HAS_OPENSSL = False
-HAS_CRYPTO = False
-try:
-  from oauth2client import crypt
-  HAS_CRYPTO = True
-  if crypt.OpenSSLVerifier is not None:
-    HAS_OPENSSL = True
-except ImportError:
-  pass
-
-logger = logging.getLogger(__name__)
-
-# Expiry is stored in RFC3339 UTC format
-EXPIRY_FORMAT = '%Y-%m-%dT%H:%M:%SZ'
-
-# Which certs to use to validate id_tokens received.
-ID_TOKEN_VERIFICATION_CERTS = 'https://www.googleapis.com/oauth2/v1/certs'
-# This symbol previously had a typo in the name; we keep the old name
-# around for now, but will remove it in the future.
-ID_TOKEN_VERIFICATON_CERTS = ID_TOKEN_VERIFICATION_CERTS
-
-# Constant to use for the out of band OAuth 2.0 flow.
-OOB_CALLBACK_URN = 'urn:ietf:wg:oauth:2.0:oob'
-
-# 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 environment variable name which can replace ~/.config if set.
-_CLOUDSDK_CONFIG_ENV_VAR = 'CLOUDSDK_CONFIG'
-
-# The error message we show users when we can't find the Application
-# Default Credentials.
-ADC_HELP_MSG = (
-    'The Application Default Credentials are not available. They are available '
-    'if running in Google Compute Engine. Otherwise, the environment variable '
-    + GOOGLE_APPLICATION_CREDENTIALS +
-    ' must be defined pointing to a file defining the credentials. See '
-    'https://developers.google.com/accounts/docs/application-default-credentials'  # 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."""
-
-
-class FlowExchangeError(Error):
-  """Error trying to exchange an authorization grant for an access token."""
-
-
-class AccessTokenRefreshError(Error):
-  """Error trying to refresh an expired access token."""
-
-
-class TokenRevokeError(Error):
-  """Error trying to revoke a token."""
-
-
-class UnknownClientSecretsFlowError(Error):
-  """The client secrets file called for an unknown type of OAuth 2.0 flow. """
-
-
-class AccessTokenCredentialsError(Error):
-  """Having only the access_token means no refresh is possible."""
-
-
-class VerifyJwtTokenError(Error):
-  """Could not retrieve certificates for validation."""
-
-
-class NonAsciiHeaderError(Error):
-  """Header names and values must be ASCII strings."""
-
-
-class ApplicationDefaultCredentialsError(Error):
-  """Error retrieving the Application Default Credentials."""
-
-
-class OAuth2DeviceCodeError(Error):
-  """Error trying to retrieve a device code."""
-
-
-class CryptoUnavailableError(Error, NotImplementedError):
-  """Raised when a crypto library is required, but none is available."""
-
-
-def _abstract():
-  raise NotImplementedError('You need to override this function')
-
-
-class MemoryCache(object):
-  """httplib2 Cache implementation which only caches locally."""
-
-  def __init__(self):
-    self.cache = {}
-
-  def get(self, key):
-    return self.cache.get(key)
-
-  def set(self, key, value):
-    self.cache[key] = value
-
-  def delete(self, key):
-    self.cache.pop(key, None)
-
-
-class Credentials(object):
-  """Base class for all Credentials objects.
-
-  Subclasses must define an authorize() method that applies the credentials to
-  an HTTP transport.
-
-  Subclasses must also specify a classmethod named 'from_json' that takes a JSON
-  string as input and returns an instantiated Credentials object.
-  """
-
-  NON_SERIALIZED_MEMBERS = ['store']
-
-
-  def authorize(self, http):
-    """Take an httplib2.Http instance (or equivalent) and authorizes it.
-
-    Authorizes it for the set of credentials, usually by replacing
-    http.request() with a method that adds in the appropriate headers and then
-    delegates to the original Http.request() method.
-
-    Args:
-      http: httplib2.Http, an http object to be used to make the refresh
-        request.
-    """
-    _abstract()
-
-
-  def refresh(self, http):
-    """Forces a refresh of the access_token.
-
-    Args:
-      http: httplib2.Http, an http object to be used to make the refresh
-        request.
-    """
-    _abstract()
-
-
-  def revoke(self, http):
-    """Revokes a refresh_token and makes the credentials void.
-
-    Args:
-      http: httplib2.Http, an http object to be used to make the revoke
-        request.
-    """
-    _abstract()
-
-
-  def apply(self, headers):
-    """Add the authorization to the headers.
-
-    Args:
-      headers: dict, the headers to add the Authorization header to.
-    """
-    _abstract()
-
-  def _to_json(self, strip):
-    """Utility function that creates JSON repr. of a Credentials object.
-
-    Args:
-      strip: array, An array of names of members to not include in the JSON.
-
-    Returns:
-       string, a JSON representation of this instance, suitable to pass to
-       from_json().
-    """
-    t = type(self)
-    d = copy.copy(self.__dict__)
-    for member in strip:
-      if member in d:
-        del d[member]
-    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__
-    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.
-
-    Returns:
-       string, a JSON representation of this instance, suitable to pass to
-       from_json().
-    """
-    return self._to_json(Credentials.NON_SERIALIZED_MEMBERS)
-
-  @classmethod
-  def new_from_json(cls, s):
-    """Utility class method to instantiate a Credentials subclass from a JSON
-    representation produced by to_json().
-
-    Args:
-      s: string, JSON from to_json().
-
-    Returns:
-      An instance of the subclass of Credentials that was serialized with
-      to_json().
-    """
-    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('.googleapiclient', '')
-      m = __import__(module)
-
-    m = __import__(module, fromlist=module.split('.')[:-1])
-    kls = getattr(m, data['_class'])
-    from_json = getattr(kls, 'from_json')
-    return from_json(s)
-
-  @classmethod
-  def from_json(cls, unused_data):
-    """Instantiate a Credentials object from a JSON description of it.
-
-    The JSON should have been produced by calling .to_json() on the object.
-
-    Args:
-      unused_data: dict, A deserialized JSON object.
-
-    Returns:
-      An instance of a Credentials subclass.
-    """
-    return Credentials()
-
-
-class Flow(object):
-  """Base class for all Flow objects."""
-  pass
-
-
-class Storage(object):
-  """Base class for all Storage objects.
-
-  Store and retrieve a single credential. This class supports locking
-  such that multiple processes and threads can operate on a single
-  store.
-  """
-
-  def acquire_lock(self):
-    """Acquires any lock necessary to access this Storage.
-
-    This lock is not reentrant.
-    """
-    pass
-
-  def release_lock(self):
-    """Release the Storage lock.
-
-    Trying to release a lock that isn't held will result in a
-    RuntimeError.
-    """
-    pass
-
-  def locked_get(self):
-    """Retrieve credential.
-
-    The Storage lock must be held when this is called.
-
-    Returns:
-      oauth2client.client.Credentials
-    """
-    _abstract()
-
-  def locked_put(self, credentials):
-    """Write a credential.
-
-    The Storage lock must be held when this is called.
-
-    Args:
-      credentials: Credentials, the credentials to store.
-    """
-    _abstract()
-
-  def locked_delete(self):
-    """Delete a credential.
-
-    The Storage lock must be held when this is called.
-    """
-    _abstract()
-
-  def get(self):
-    """Retrieve credential.
-
-    The Storage lock must *not* be held when this is called.
-
-    Returns:
-      oauth2client.client.Credentials
-    """
-    self.acquire_lock()
-    try:
-      return self.locked_get()
-    finally:
-      self.release_lock()
-
-  def put(self, credentials):
-    """Write a credential.
-
-    The Storage lock must be held when this is called.
-
-    Args:
-      credentials: Credentials, the credentials to store.
-    """
-    self.acquire_lock()
-    try:
-      self.locked_put(credentials)
-    finally:
-      self.release_lock()
-
-  def delete(self):
-    """Delete credential.
-
-    Frees any resources associated with storing the credential.
-    The Storage lock must *not* be held when this is called.
-
-    Returns:
-      None
-    """
-    self.acquire_lock()
-    try:
-      return self.locked_delete()
-    finally:
-      self.release_lock()
-
-
-def clean_headers(headers):
-  """Forces header keys and values to be strings, i.e not unicode.
-
-  The httplib module just concats the header keys and values in a way that may
-  make the message header a unicode string, which, if it then tries to
-  contatenate to a binary request body may result in a unicode decode error.
-
-  Args:
-    headers: dict, A dictionary of headers.
-
-  Returns:
-    The same dictionary but with all the keys converted to strings.
-  """
-  clean = {}
-  try:
-    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
-
-
-def _update_query_params(uri, params):
-  """Updates a URI with new query parameters.
-
-  Args:
-    uri: string, A valid URI, with potential existing query parameters.
-    params: dict, A dictionary of query parameters.
-
-  Returns:
-    The same URI but with the new query parameters added.
-  """
-  parts = urllib.parse.urlparse(uri)
-  query_params = dict(urllib.parse.parse_qsl(parts.query))
-  query_params.update(params)
-  new_parts = parts._replace(query=urllib.parse.urlencode(query_params))
-  return urllib.parse.urlunparse(new_parts)
-
-
-class OAuth2Credentials(Credentials):
-  """Credentials object for OAuth 2.0.
-
-  Credentials can be applied to an httplib2.Http object using the authorize()
-  method, which then adds the OAuth 2.0 access token to each request.
-
-  OAuth2Credentials objects may be safely pickled and unpickled.
-  """
-
-  @util.positional(8)
-  def __init__(self, access_token, client_id, client_secret, refresh_token,
-               token_expiry, token_uri, user_agent, revoke_uri=None,
-               id_token=None, token_response=None):
-    """Create an instance of OAuth2Credentials.
-
-    This constructor is not usually called by the user, instead
-    OAuth2Credentials objects are instantiated by the OAuth2WebServerFlow.
-
-    Args:
-      access_token: string, access token.
-      client_id: string, client identifier.
-      client_secret: string, client secret.
-      refresh_token: string, refresh token.
-      token_expiry: datetime, when the access_token expires.
-      token_uri: string, URI of token endpoint.
-      user_agent: string, The HTTP User-Agent to provide for this application.
-      revoke_uri: string, URI for revoke endpoint. Defaults to None; a token
-        can't be revoked if this is None.
-      id_token: object, The identity of the resource owner.
-      token_response: dict, the decoded response to the token request. None
-        if a token hasn't been requested yet. Stored because some providers
-        (e.g. wordpress.com) include extra fields that clients may want.
-
-    Notes:
-      store: callable, A callable that when passed a Credential
-        will store the credential back to where it came from.
-        This is needed to store the latest access_token if it
-        has expired and been refreshed.
-    """
-    self.access_token = access_token
-    self.client_id = client_id
-    self.client_secret = client_secret
-    self.refresh_token = refresh_token
-    self.store = None
-    self.token_expiry = token_expiry
-    self.token_uri = token_uri
-    self.user_agent = user_agent
-    self.revoke_uri = revoke_uri
-    self.id_token = id_token
-    self.token_response = token_response
-
-    # True if the credentials have been revoked or expired and can't be
-    # refreshed.
-    self.invalid = False
-
-  def authorize(self, http):
-    """Authorize an httplib2.Http instance with these credentials.
-
-    The modified http.request method will add authentication headers to each
-    request and will refresh access_tokens when a 401 is received on a
-    request. In addition the http.request method has a credentials property,
-    http.request.credentials, which is the Credentials object that authorized
-    it.
-
-    Args:
-       http: An instance of ``httplib2.Http`` or something that acts
-         like it.
-
-    Returns:
-       A modified instance of http that was passed in.
-
-    Example::
-
-      h = httplib2.Http()
-      h = credentials.authorize(h)
-
-    You can't create a new OAuth subclass of httplib2.Authentication
-    because it never gets passed the absolute URI, which is needed for
-    signing. So instead we have to overload 'request' with a closure
-    that adds in the Authorization header and then calls the original
-    version of 'request()'.
-
-    """
-    request_orig = http.request
-
-    # The closure that will replace 'httplib2.Http.request'.
-    @util.positional(1)
-    def new_request(uri, method='GET', body=None, headers=None,
-                    redirections=httplib2.DEFAULT_MAX_REDIRECTS,
-                    connection_type=None):
-      if not self.access_token:
-        logger.info('Attempting refresh to obtain initial access_token')
-        self._refresh(request_orig)
-
-      # 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:
-        if 'user-agent' in headers:
-          headers['user-agent'] = self.user_agent + ' ' + headers['user-agent']
-        else:
-          headers['user-agent'] = self.user_agent
-
-      body_stream_position = None
-      if all(getattr(body, stream_prop, None) for stream_prop in
-             ('read', 'seek', 'tell')):
-        body_stream_position = body.tell()
-
-      resp, content = request_orig(uri, method, body, clean_headers(headers),
-                                   redirections, connection_type)
-
-      # A stored token may expire between the time it is retrieved and the time
-      # the request is made, so we may need to try twice.
-      max_refresh_attempts = 2
-      for refresh_attempt in range(max_refresh_attempts):
-        if resp.status not in REFRESH_STATUS_CODES:
-          break
-        logger.info('Refreshing due to a %s (attempt %s/%s)', resp.status,
-                    refresh_attempt + 1, max_refresh_attempts)
-        self._refresh(request_orig)
-        self.apply(headers)
-        if body_stream_position is not None:
-          body.seek(body_stream_position)
-
-        resp, content = request_orig(uri, method, body, clean_headers(headers),
-                                     redirections, connection_type)
-
-      return (resp, content)
-
-    # Replace the request method with our own closure.
-    http.request = new_request
-
-    # Set credentials as a property of the request method.
-    setattr(http.request, 'credentials', self)
-
-    return http
-
-  def refresh(self, http):
-    """Forces a refresh of the access_token.
-
-    Args:
-      http: httplib2.Http, an http object to be used to make the refresh
-        request.
-    """
-    self._refresh(http.request)
-
-  def revoke(self, http):
-    """Revokes a refresh_token and makes the credentials void.
-
-    Args:
-      http: httplib2.Http, an http object to be used to make the revoke
-        request.
-    """
-    self._revoke(http.request)
-
-  def apply(self, headers):
-    """Add the authorization to the headers.
-
-    Args:
-      headers: dict, the headers to add the Authorization header to.
-    """
-    headers['Authorization'] = 'Bearer ' + self.access_token
-
-  def to_json(self):
-    return self._to_json(Credentials.NON_SERIALIZED_MEMBERS)
-
-  @classmethod
-  def from_json(cls, s):
-    """Instantiate a Credentials object from a JSON description of it. The JSON
-    should have been produced by calling .to_json() on the object.
-
-    Args:
-      data: dict, A deserialized JSON object.
-
-    Returns:
-      An instance of a Credentials subclass.
-    """
-    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 ValueError:
-        data['token_expiry'] = None
-    retval = cls(
-        data['access_token'],
-        data['client_id'],
-        data['client_secret'],
-        data['refresh_token'],
-        data['token_expiry'],
-        data['token_uri'],
-        data['user_agent'],
-        revoke_uri=data.get('revoke_uri', None),
-        id_token=data.get('id_token', None),
-        token_response=data.get('token_response', None))
-    retval.invalid = data['invalid']
-    return retval
-
-  @property
-  def access_token_expired(self):
-    """True if the credential is expired or invalid.
-
-    If the token_expiry isn't set, we assume the token doesn't expire.
-    """
-    if self.invalid:
-      return True
-
-    if not self.token_expiry:
-      return False
-
-    now = datetime.datetime.utcnow()
-    if now >= self.token_expiry:
-      logger.info('access_token is expired. Now: %s, token_expiry: %s',
-                  now, self.token_expiry)
-      return True
-    return False
-
-  def 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 Storage object.
-        This is needed to store the latest access_token if it
-        has expired and been refreshed. This implementation uses
-        locking to check for updates before updating the
-        access_token.
-    """
-    self.store = store
-
-  def _expires_in(self):
-    """Return the number of seconds until this token expires.
-
-    If token_expiry is in the past, this method will return 0, meaning the
-    token has already expired.
-    If token_expiry is None, this method will return None. Note that returning
-    0 in such a case would not be fair: the token may still be valid;
-    we just don't know anything about it.
-    """
-    if self.token_expiry:
-      now = 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__())
-
-  def __getstate__(self):
-    """Trim the state down to something that can be pickled."""
-    d = copy.copy(self.__dict__)
-    del d['store']
-    return d
-
-  def __setstate__(self, state):
-    """Reconstitute the state of the object from being pickled."""
-    self.__dict__.update(state)
-    self.store = None
-
-  def _generate_refresh_request_body(self):
-    """Generate the body that will be used in the refresh request."""
-    body = urllib.parse.urlencode({
-        'grant_type': 'refresh_token',
-        'client_id': self.client_id,
-        'client_secret': self.client_secret,
-        'refresh_token': self.refresh_token,
-        })
-    return body
-
-  def _generate_refresh_request_headers(self):
-    """Generate the headers that will be used in the refresh request."""
-    headers = {
-        'content-type': 'application/x-www-form-urlencoded',
-    }
-
-    if self.user_agent is not None:
-      headers['user-agent'] = self.user_agent
-
-    return headers
-
-  def _refresh(self, http_request):
-    """Refreshes the access_token.
-
-    This method first checks by reading the Storage object if available.
-    If a refresh is still needed, it holds the Storage lock until the
-    refresh is completed.
-
-    Args:
-      http_request: callable, a callable that matches the method signature of
-        httplib2.Http.request, used to make the refresh request.
-
-    Raises:
-      AccessTokenRefreshError: When the refresh fails.
-    """
-    if not self.store:
-      self._do_refresh_request(http_request)
-    else:
-      self.store.acquire_lock()
-      try:
-        new_cred = self.store.locked_get()
-
-        if (new_cred and not new_cred.invalid and
-            new_cred.access_token != self.access_token and
-            not new_cred.access_token_expired):
-          logger.info('Updated access_token read from Storage')
-          self._updateFromCredential(new_cred)
-        else:
-          self._do_refresh_request(http_request)
-      finally:
-        self.store.release_lock()
-
-  def _do_refresh_request(self, http_request):
-    """Refresh the access_token using the refresh_token.
-
-    Args:
-      http_request: callable, a callable that matches the method signature of
-        httplib2.Http.request, used to make the refresh request.
-
-    Raises:
-      AccessTokenRefreshError: When the refresh fails.
-    """
-    body = self._generate_refresh_request_body()
-    headers = self._generate_refresh_request_headers()
-
-    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:
-      d = json.loads(content)
-      self.token_response = d
-      self.access_token = d['access_token']
-      self.refresh_token = d.get('refresh_token', self.refresh_token)
-      if 'expires_in' in d:
-        self.token_expiry = datetime.timedelta(
-            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)
-      error_msg = 'Invalid response %s.' % resp['status']
-      try:
-        d = json.loads(content)
-        if 'error' in d:
-          error_msg = d['error']
-          if 'error_description' in d:
-            error_msg += ': ' + d['error_description']
-          self.invalid = True
-          if self.store:
-            self.store.locked_put(self)
-      except (TypeError, ValueError):
-        pass
-      raise AccessTokenRefreshError(error_msg)
-
-  def _revoke(self, http_request):
-    """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 or self.access_token)
-
-  def _do_revoke(self, http_request, token):
-    """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 refresh request.
-      token: A string used as the token to be revoked. Can be either an
-        access_token or refresh_token.
-
-    Raises:
-      TokenRevokeError: If the revoke request does not return with a 200 OK.
-    """
-    logger.info('Revoking token')
-    query_params = {'token': token}
-    token_revoke_uri = _update_query_params(self.revoke_uri, query_params)
-    resp, content = http_request(token_revoke_uri)
-    if resp.status == 200:
-      self.invalid = True
-    else:
-      error_msg = 'Invalid response %s.' % resp.status
-      try:
-        d = json.loads(content)
-        if 'error' in d:
-          error_msg = d['error']
-      except (TypeError, ValueError):
-        pass
-      raise TokenRevokeError(error_msg)
-
-    if self.store:
-      self.store.delete()
-
-
-class AccessTokenCredentials(OAuth2Credentials):
-  """Credentials object for OAuth 2.0.
-
-  Credentials can be applied to an httplib2.Http object using the
-  authorize() method, which then signs each request from that object
-  with the OAuth 2.0 access token. This set of credentials is for the
-  use case where you have acquired an OAuth 2.0 access_token from
-  another place such as a JavaScript client or another web
-  application, and wish to use it from Python. Because only the
-  access_token is present it can not be refreshed and will in time
-  expire.
-
-  AccessTokenCredentials objects may be safely pickled and unpickled.
-
-  Usage::
-
-    credentials = AccessTokenCredentials('<an access token>',
-      'my-user-agent/1.0')
-    http = httplib2.Http()
-    http = credentials.authorize(http)
-
-  Exceptions:
-    AccessTokenCredentialsExpired: raised when the access_token expires or is
-      revoked.
-  """
-
-  def __init__(self, access_token, user_agent, revoke_uri=None):
-    """Create an instance of OAuth2Credentials
-
-    This is one of the few types if Credentials that you should contrust,
-    Credentials objects are usually instantiated by a Flow.
-
-    Args:
-      access_token: string, access token.
-      user_agent: string, The HTTP User-Agent to provide for this application.
-      revoke_uri: string, URI for revoke endpoint. Defaults to None; a token
-        can't be revoked if this is None.
-    """
-    super(AccessTokenCredentials, self).__init__(
-        access_token,
-        None,
-        None,
-        None,
-        None,
-        None,
-        user_agent,
-        revoke_uri=revoke_uri)
-
-
-  @classmethod
-  def from_json(cls, 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'])
-    return retval
-
-  def _refresh(self, http_request):
-    raise AccessTokenCredentialsError(
-        'The access_token is expired or invalid and can\'t be refreshed.')
-
-  def _revoke(self, http_request):
-    """Revokes the access_token and deletes the store if available.
-
-    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.access_token)
-
-
-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
-
-  try:
-    import google.appengine
-    has_gae_sdk = True
-  except ImportError:
-    has_gae_sdk = False
-
-  if has_gae_sdk:
-    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()
-
-  config_dir = os.path.dirname(well_known_file)
-  if not os.path.isdir(config_dir):
-    raise OSError('Config directory does not exist: %s' % config_dir)
-
-  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'
-
-  default_config_dir = os.getenv(_CLOUDSDK_CONFIG_ENV_VAR)
-  if default_config_dir is None:
-    if os.name == 'nt':
-      try:
-        default_config_dir = 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_dir = os.path.join(drive, '\\',
-                                          _CLOUDSDK_CONFIG_DIRECTORY)
-    else:
-      default_config_dir = os.path.join(os.path.expanduser('~'),
-                                        '.config',
-                                        _CLOUDSDK_CONFIG_DIRECTORY)
-
-  return os.path.join(default_config_dir, WELL_KNOWN_CREDENTIALS_FILE)
-
-
-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
-  represents a two legged flow, and therefore has all of the required
-  information to generate and refresh its own access tokens. It must
-  be subclassed to generate the appropriate assertion string.
-
-  AssertionCredentials objects may be safely pickled and unpickled.
-  """
-
-  @util.positional(2)
-  def __init__(self, assertion_type, user_agent=None,
-               token_uri=GOOGLE_TOKEN_URI,
-               revoke_uri=GOOGLE_REVOKE_URI,
-               **unused_kwargs):
-    """Constructor for AssertionFlowCredentials.
-
-    Args:
-      assertion_type: string, assertion type that will be declared to the auth
-        server
-      user_agent: string, The HTTP User-Agent to provide for this application.
-      token_uri: string, URI for token endpoint. For convenience
-        defaults to Google's endpoints but any OAuth 2.0 provider can be used.
-      revoke_uri: string, URI for revoke endpoint.
-    """
-    super(AssertionCredentials, self).__init__(
-        None,
-        None,
-        None,
-        None,
-        None,
-        token_uri,
-        user_agent,
-        revoke_uri=revoke_uri)
-    self.assertion_type = assertion_type
-
-  def _generate_refresh_request_body(self):
-    assertion = self._generate_assertion()
-
-    body = urllib.parse.urlencode({
-        'assertion': assertion,
-        'grant_type': 'urn:ietf:params:oauth:grant-type:jwt-bearer',
-        })
-
-    return body
-
-  def _generate_assertion(self):
-    """Generate the assertion string that will be used in the access token
-    request.
-    """
-    _abstract()
-
-  def _revoke(self, http_request):
-    """Revokes the access_token and deletes the store if available.
-
-    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.access_token)
-
-
-def _RequireCryptoOrDie():
-  """Ensure we have a crypto library, or throw CryptoUnavailableError.
-
-  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')
-
-
-class SignedJwtAssertionCredentials(AssertionCredentials):
-  """Credentials object used for OAuth 2.0 Signed JWT assertion grants.
-
-  This credential does not require a flow to instantiate because it
-  represents a two legged flow, and therefore has all of the required
-  information to generate and refresh its own access tokens.
-
-  SignedJwtAssertionCredentials requires either PyOpenSSL, or PyCrypto
-  2.6 or later. For App Engine you may also consider using
-  AppAssertionCredentials.
-  """
-
-  MAX_TOKEN_LIFETIME_SECS = 3600  # 1 hour in seconds
-
-  @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:
-      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:
-      CryptoUnavailableError if no crypto library is available.
-    """
-    _RequireCryptoOrDie()
-    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)
-    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.
-  if isinstance(b64string, six.text_type):
-    b64string = b64string.encode('ascii')
-  padded = b64string + b'=' * (4 - len(b64string) % 4)
-  return base64.urlsafe_b64decode(padded)
-
-
-def _extract_id_token(id_token):
-  """Extract the JSON payload from a JWT.
-
-  Does the extraction w/o checking the signature.
-
-  Args:
-    id_token: string or bytestring, OAuth 2.0 id_token.
-
-  Returns:
-    object, The deserialized JSON payload.
-  """
-  if type(id_token) == bytes:
-    segments = id_token.split(b'.')
-  else:
-    segments = id_token.split(u'.')
-
-  if len(segments) != 3:
-    raise VerifyJwtTokenError(
-        'Wrong number of segments in token: %s' % id_token)
-
-  return json.loads(_urlsafe_b64decode(segments[1]).decode('utf-8'))
-
-
-def _parse_exchange_token_response(content):
-  """Parses response of an exchange token request.
-
-  Most providers return JSON but some (e.g. Facebook) return a
-  url-encoded string.
-
-  Args:
-    content: The body of a response
-
-  Returns:
-    Content as a dictionary object. Note that the dict could be empty,
-    i.e. {}. That basically indicates a failure.
-  """
-  resp = {}
-  try:
-    resp = json.loads(content.decode('utf-8'))
-  except Exception:
-    # different JSON libs raise different exceptions,
-    # so we just do a catch-all here
-    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:
-    resp['expires_in'] = resp.pop('expires')
-
-  return resp
-
-
-@util.positional(4)
-def credentials_from_code(client_id, client_secret, scope, code,
-                          redirect_uri='postmessage', http=None,
-                          user_agent=None, token_uri=GOOGLE_TOKEN_URI,
-                          auth_uri=GOOGLE_AUTH_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 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
-    http: httplib2.Http, optional http instance to use to do the fetch
-    token_uri: string, URI for token endpoint. For convenience
-      defaults to Google's endpoints but any OAuth 2.0 provider can be used.
-    auth_uri: string, URI for authorization endpoint. For convenience
-      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.
-
-  Raises:
-    FlowExchangeError if the authorization code cannot be exchanged for an
-     access token
-  """
-  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, device_uri=device_uri)
-
-  credentials = flow.step2_exchange(code, http=http)
-  return credentials
-
-
-@util.positional(3)
-def credentials_from_clientsecrets_and_code(filename, scope, code,
-                                            message = None,
-                                            redirect_uri='postmessage',
-                                            http=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
-  file or will raise InvalidClientSecretsError for unknown types of Flows.
-
-  Args:
-    filename: string, File name of clientsecrets.
-    scope: string or iterable of strings, scope(s) to request.
-    code: string, An authorization code, most likely passed down from
-      the client
-    message: string, A friendly string to display to the user if the
-      clientsecrets file is missing or invalid. If message is provided then
-      sys.exit will be called in the case of an error. If message in not
-      provided then clientsecrets.InvalidClientSecretsError will be raised.
-    redirect_uri: string, this is generally set to 'postmessage' to match the
-      redirect_uri that the client specified
-    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.
-
-  Raises:
-    FlowExchangeError if the authorization code cannot be exchanged for an
-     access token
-    UnknownClientSecretsFlowError if the file describes an unknown kind of Flow.
-    clientsecrets.InvalidClientSecretsError if the clientsecrets file is
-      invalid.
-  """
-  flow = flow_from_clientsecrets(filename, scope, message=message, cache=cache,
-                                 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.
-
-  OAuth2WebServerFlow objects may be safely pickled and unpickled.
-  """
-
-  @util.positional(4)
-  def __init__(self, client_id, client_secret, scope,
-               redirect_uri=None,
-               user_agent=None,
-               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.
-
-    The kwargs argument is used to set extra query parameters on the
-    auth_uri. For example, the access_type and approval_prompt
-    query parameters can be set via kwargs.
-
-    Args:
-      client_id: string, client identifier.
-      client_secret: string client secret.
-      scope: string or iterable of strings, scope(s) of the credentials being
-        requested.
-      redirect_uri: string, Either the string 'urn:ietf:wg:oauth:2.0:oob' for
-        a non-web-based application, or a URI that handles the callback from
-        the authorization server.
-      user_agent: string, HTTP User-Agent to provide for this application.
-      auth_uri: string, URI for authorization endpoint. For convenience
-        defaults to Google's endpoints but any OAuth 2.0 provider can be used.
-      token_uri: string, URI for token endpoint. For convenience
-        defaults to Google's endpoints but any OAuth 2.0 provider can be used.
-      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.
-    """
-    self.client_id = client_id
-    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',
-    }
-    self.params.update(kwargs)
-
-  @util.positional(1)
-  def step1_get_authorize_url(self, redirect_uri=None):
-    """Returns a URI to redirect to the provider.
-
-    Args:
-      redirect_uri: string, Either the string 'urn:ietf:wg:oauth:2.0:oob' for
-        a non-web-based application, or a URI that handles the callback from
-        the authorization server. This parameter is deprecated, please move to
-        passing the redirect_uri in via the constructor.
-
-    Returns:
-      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 '
-          'move to passing the redirect_uri in via the constructor.'))
-      self.redirect_uri = redirect_uri
-
-    if self.redirect_uri is None:
-      raise ValueError('The value of redirect_uri must not be None.')
-
-    query_params = {
-        'client_id': self.client_id,
-        '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=None, http=None, device_flow_info=None):
-    """Exchanges a code for OAuth2Credentials.
-
-    Args:
-
-      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 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 code is None:
-      code = device_flow_info.device_code
-    elif not isinstance(code, six.string_types):
-      if 'code' not in code:
-        raise FlowExchangeError(code.get(
-            'error', 'No code was supplied in the query parameters.'))
-      code = code['code']
-
-    post_data = {
-        'client_id': self.client_id,
-        'client_secret': self.client_secret,
-        'code': code,
-        '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',
-    }
-
-    if self.user_agent is not None:
-      headers['user-agent'] = self.user_agent
-
-    if http is None:
-      http = httplib2.Http()
-
-    resp, content = http.request(self.token_uri, method='POST', body=body,
-                                 headers=headers)
-    d = _parse_exchange_token_response(content)
-    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:
-        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=extracted_id_token,
-                               token_response=d)
-    else:
-      logger.info('Failed to retrieve access token: %s', content)
-      if 'error' in d:
-        # you never know what those providers got to say
-        error_msg = str(d['error']) + str(d.get('error_description', ''))
-      else:
-        error_msg = 'Invalid response: %s.' % str(resp.status)
-      raise FlowExchangeError(error_msg)
-
-
-@util.positional(2)
-def flow_from_clientsecrets(filename, scope, redirect_uri=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
-  file or will raise InvalidClientSecretsError for unknown types of Flows.
-
-  Args:
-    filename: string, File name of client secrets.
-    scope: string or iterable of strings, scope(s) to request.
-    redirect_uri: string, Either the string 'urn:ietf:wg:oauth:2.0:oob' for
-      a non-web-based application, or a URI that handles the callback from
-      the authorization server.
-    message: string, A friendly string to display to the user if the
-      clientsecrets file is missing or invalid. If message is provided then
-      sys.exit will be called in the case of an error. If message in not
-      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.
-
-  Raises:
-    UnknownClientSecretsFlowError if the file describes an unknown kind of Flow.
-    clientsecrets.InvalidClientSecretsError if the clientsecrets file is
-      invalid.
-  """
-  try:
-    client_type, client_info = clientsecrets.loadfile(filename, cache=cache)
-    if client_type in (clientsecrets.TYPE_WEB, clientsecrets.TYPE_INSTALLED):
-      constructor_kwargs = {
-          '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)
-
-  except clientsecrets.InvalidClientSecretsError:
-    if message:
-      sys.exit(message)
-    else:
-      raise
-  else:
-    raise UnknownClientSecretsFlowError(
-        'This OAuth 2.0 flow is unsupported: %r' % client_type)