Add OAuth2 support for end users (i.e. 3-legged flow with the browser).

third_party/oauth2client/locked_file.py

 # Copyright 2011 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,
@@ skipping 17 matching lines @@
     f.unlock_and_close()
 """
 
 __author__ = 'cache@google.com (David T McWherter)'
 
 import errno
 import logging
 import os
 import time
 
-from oauth2client import util
+from . import util
 
 logger = logging.getLogger(__name__)
 
 
 class CredentialsFileSymbolicLinkError(Exception):
   """Credentials files must not be symbolic links."""
 
 
 class AlreadyLockedException(Exception):
   """Trying to lock a file that has already been locked by the LockedFile."""
@@ skipping 315 matching lines @@
 
     Raises:
       AlreadyLockedException: if the lock is already acquired.
       IOError: if the open fails.
     """
     self._opener.open_and_lock(timeout, delay)
 
   def unlock_and_close(self):
     """Unlock and close a file."""
     self._opener.unlock_and_close()