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# 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
from typing import Any, Optional
import grpc
def _sign_request(
callback: grpc.AuthMetadataPluginCallback,
token: Optional[str],
error: Optional[Exception],
):
metadata = (("authorization", "Bearer {}".format(token)),)
callback(metadata, error)
class GoogleCallCredentials(grpc.AuthMetadataPlugin):
"""Metadata wrapper for GoogleCredentials from the oauth2client library."""
_is_jwt: bool
_credentials: Any
# TODO(xuanwn): Give credentials an actual type.
def __init__(self, credentials: Any):
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: grpc.AuthMetadataContext,
callback: grpc.AuthMetadataPluginCallback,
):
try:
if self._is_jwt:
access_token = self._credentials.get_access_token(
additional_claims={
"aud": context.service_url # pytype: disable=attribute-error
}
).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."""
_access_token: str
def __init__(self, access_token: str):
self._access_token = access_token
def __call__(
self,
context: grpc.AuthMetadataContext,
callback: grpc.AuthMetadataPluginCallback,
):
_sign_request(callback, self._access_token, None)
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