Replace custom blob gRPC API with ByteStream

client/third_party/google/auth/exceptions.py

-# Copyright 2015 Google Inc. All rights reserved.
+# Copyright 2016 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.
 
-"""Client library for using OAuth2, especially with Google APIs."""
+"""Exceptions used in the google.auth package."""
 
-__version__ = '1.5.2'
 
-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_INFO_URI = 'https://www.googleapis.com/oauth2/v2/tokeninfo'
+class GoogleAuthError(Exception):
+    """Base class for all google.auth errors."""
+
+
+class TransportError(GoogleAuthError):
+    """Used to indicate an error occurred during an HTTP request."""
+
+
+class RefreshError(GoogleAuthError):
+    """Used to indicate that an refreshing the credentials' access token
+    failed."""
+
+
+class DefaultCredentialsError(GoogleAuthError):
+    """Used to indicate that acquiring default credentials failed."""