Route Python Beta API through Python GA API

1 files changed, 73 insertions, 0 deletions

diff --git a/src/python/grpcio/grpc/_auth.py b/src/python/grpcio/grpc/_auth.py
new file mode 100644
index 0000000000..3ae00ca23a
--- /dev/null
+++ b/src/python/grpcio/grpc/_auth.py
@@ -0,0 +1,73 @@
+# Copyright 2016, Google Inc.
+# All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""GRPCAuthMetadataPlugins for standard authentication."""
+
+from concurrent import futures
+
+import grpc
+
+
+def _sign_request(callback, token, error):
+  metadata = (('authorization', 'Bearer {}'.format(token)),)
+  callback(metadata, error)
+
+
+class GoogleCallCredentials(grpc.AuthMetadataPlugin):
+  """Metadata wrapper for GoogleCredentials from the oauth2client library."""
+
+  def __init__(self, credentials):
+    self._credentials = credentials
+    self._pool = futures.ThreadPoolExecutor(max_workers=1)
+
+  def __call__(self, context, callback):
+    # MetadataPlugins cannot block (see grpc.beta.interfaces.py)
+    future = self._pool.submit(self._credentials.get_access_token)
+    future.add_done_callback(lambda x: self._get_token_callback(callback, x))
+
+  def _get_token_callback(self, callback, future):
+    try:
+      access_token = future.result().access_token
+    except Exception as e:
+      _sign_request(callback, None, e)
+    else:
+      _sign_request(callback, access_token, None)
+
+  def __del__(self):
+    self._pool.shutdown(wait=False)
+
+
+class AccessTokenCallCredentials(grpc.AuthMetadataPlugin):
+  """Metadata wrapper for raw access token credentials."""
+
+  def __init__(self, access_token):
+    self._access_token = access_token
+
+  def __call__(self, context, callback):
+    _sign_request(callback, self._access_token, None)