81 lines
2.6 KiB
Python
81 lines
2.6 KiB
Python
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# Copyright 2016 gRPC authors.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""GRPCAuthMetadataPlugins for standard authentication."""
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import inspect
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from typing import Any, Optional
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import grpc
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def _sign_request(
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callback: grpc.AuthMetadataPluginCallback,
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token: Optional[str],
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error: Optional[Exception],
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):
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metadata = (("authorization", "Bearer {}".format(token)),)
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callback(metadata, error)
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class GoogleCallCredentials(grpc.AuthMetadataPlugin):
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"""Metadata wrapper for GoogleCredentials from the oauth2client library."""
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_is_jwt: bool
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_credentials: Any
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# TODO(xuanwn): Give credentials an actual type.
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def __init__(self, credentials: Any):
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self._credentials = credentials
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# Hack to determine if these are JWT creds and we need to pass
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# additional_claims when getting a token
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self._is_jwt = (
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"additional_claims"
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in inspect.getfullargspec(credentials.get_access_token).args
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)
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def __call__(
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self,
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context: grpc.AuthMetadataContext,
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callback: grpc.AuthMetadataPluginCallback,
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):
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try:
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if self._is_jwt:
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access_token = self._credentials.get_access_token(
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additional_claims={
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"aud": context.service_url # pytype: disable=attribute-error
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}
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).access_token
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else:
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access_token = self._credentials.get_access_token().access_token
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except Exception as exception: # pylint: disable=broad-except
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_sign_request(callback, None, exception)
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else:
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_sign_request(callback, access_token, None)
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class AccessTokenAuthMetadataPlugin(grpc.AuthMetadataPlugin):
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"""Metadata wrapper for raw access token credentials."""
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_access_token: str
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def __init__(self, access_token: str):
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self._access_token = access_token
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def __call__(
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self,
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context: grpc.AuthMetadataContext,
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callback: grpc.AuthMetadataPluginCallback,
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):
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_sign_request(callback, self._access_token, None)
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