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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)

	# 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)