old_contents: # Copyright 2016 gRPC authors.
  #
  # 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.
  """GRPCAuthMetadataPlugins for standard authentication."""
  
  import inspect
  
  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
          # Hack to determine if these are JWT creds and we need to pass
          # additional_claims when getting a token
          self._is_jwt = 'additional_claims' in inspect.getargspec(  # pylint: disable=deprecated-method
              credentials.get_access_token).args
  
      def __call__(self, context, callback):
          try:
              if self._is_jwt:
                  access_token = self._credentials.get_access_token(
                      additional_claims={
                          'aud': context.service_url
                      }).access_token
              else:
                  access_token = self._credentials.get_access_token().access_token
          except Exception as exception:  # pylint: disable=broad-except
              _sign_request(callback, None, exception)
          else:
              _sign_request(callback, access_token, None)
  
  
  class AccessTokenAuthMetadataPlugin(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)
  
new_contents: # Copyright 2016 gRPC authors.
  #
  # 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.
  """GRPCAuthMetadataPlugins for standard authentication."""
  
  import inspect
  
  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
          # Hack to determine if these are JWT creds and we need to pass
          # additional_claims when getting a token
          self._is_jwt = 'additional_claims' in inspect.getfullargspec(
              credentials.get_access_token).args
  
      def __call__(self, context, callback):
          try:
              if self._is_jwt:
                  access_token = self._credentials.get_access_token(
                      additional_claims={
                          'aud': context.service_url
                      }).access_token
              else:
                  access_token = self._credentials.get_access_token().access_token
          except Exception as exception:  # pylint: disable=broad-except
              _sign_request(callback, None, exception)
          else:
              _sign_request(callback, access_token, None)
  
  
  class AccessTokenAuthMetadataPlugin(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)
  
subject: Replace deprecated Python “inspect.getargspec” (#29963)