76 lines
2.5 KiB
Python
76 lines
2.5 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 concurrent import futures
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import grpc
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def _sign_request(callback, token, error):
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metadata = (('authorization', 'Bearer {}'.format(token)),)
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callback(metadata, error)
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def _create_get_token_callback(callback):
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def get_token_callback(future):
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try:
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access_token = future.result().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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return get_token_callback
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class GoogleCallCredentials(grpc.AuthMetadataPlugin):
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"""Metadata wrapper for GoogleCredentials from the oauth2client library."""
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def __init__(self, credentials):
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self._credentials = credentials
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self._pool = futures.ThreadPoolExecutor(max_workers=1)
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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 = 'additional_claims' in inspect.getargspec(
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credentials.get_access_token).args
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def __call__(self, context, callback):
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# MetadataPlugins cannot block (see grpc.beta.interfaces.py)
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if self._is_jwt:
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future = self._pool.submit(
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self._credentials.get_access_token,
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additional_claims={
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'aud': context.service_url
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})
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else:
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future = self._pool.submit(self._credentials.get_access_token)
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future.add_done_callback(_create_get_token_callback(callback))
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def __del__(self):
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self._pool.shutdown(wait=False)
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class AccessTokenAuthMetadataPlugin(grpc.AuthMetadataPlugin):
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"""Metadata wrapper for raw access token credentials."""
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def __init__(self, access_token):
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self._access_token = access_token
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def __call__(self, context, callback):
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_sign_request(callback, self._access_token, None)
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