Commit initial code.

drivepy/auth.py

@@ -0,0 +1,31 @@
+from oauth2client.service_account import ServiceAccountCredentials
+import json
+import drivepy.config as config
+from httplib2 import Http
+
+class ServiceAuthentication(object):
+    """Service Authorization for server-server OAuth2 support
+
+    Fields:
+        credentials: ServiceAccountCredentials object loaded from the json file
+        authorization: HTTP authorization object
+    """
+    def __init__(self, auth_file):
+        """Creates a ServiceAuthentication object
+
+        Args:
+            auth_file: a json file location that contains Google API credentials
+        Returns:
+            An instance of the ServiceAuthentication object
+        """
+        credentials = None
+        if isinstance(auth_file, file):
+            auth_dict = json.load(auth_file)
+            credentials = ServiceAccountCredentials.from_json_keyfile_dict(auth_dict,
+                                                                           scopes=[config.GOOGLE_DRIVE_SCOPE])
+        else:
+            credentials = ServiceAccountCredentials.from_json_keyfile_name(auth_file,
+                                                                           scopes=[config.GOOGLE_DRIVE_SCOPE])
+
+        self.credentials = credentials
+        self.authorization = self.credentials.authorize(Http())