Drop oauth2client dependency (#499)

Author: Helen Koike

googleapiclient/discovery_cache/file_cache.py

@@ -36,9 +36,9 @@
   try:
     from oauth2client.locked_file import LockedFile
   except ImportError:
-    # oauth2client > 4.0.0
+    # oauth2client > 4.0.0 or google-auth
     raise ImportError(
-      'file_cache is unavailable when using oauth2client >= 4.0.0')
+      'file_cache is unavailable when using oauth2client >= 4.0.0 or google-auth')
 
 from . import base
 from ..discovery_cache import DISCOVERY_DOC_MAX_AGE

setup.py

@@ -64,7 +64,8 @@ def _DetectBadness():
 
 install_requires = [
     'httplib2>=0.9.2,<1dev',
-    'oauth2client>=1.5.0,<5.0.0dev',
+    'google-auth>=1.4.1',
+    'google-auth-httplib2>=0.0.3',
     'six>=1.6.1,<2dev',
     'uritemplate>=3.0.0,<4dev',
 ]

tests/__init__.py

@@ -16,12 +16,7 @@
 __author__ = '[email protected] (Ali Afshar)'
 
 
-# Oauth2client < 3 has the positional helper in 'util', >= 3 has it
-# in '_helpers'.
-try:
-  from oauth2client import util
-except ImportError:
-  from oauth2client import _helpers as util
+from googleapiclient import _helpers as util
 
 
 def setup_package():