Logan AttwoodandGitHub
fca8bd3d0e
* Fix race condition in AWS request signers Signed-off-by: Logan Attwood <[email protected]> * Conditionally expose get_frozen_credentials on mock_session Signed-off-by: Logan Attwood <[email protected]> * Use inheritance to make tests cleaner Signed-off-by: Logan Attwood <[email protected]> --------- Signed-off-by: Logan Attwood <[email protected]>
73 lines
2.6 KiB
Python
73 lines
2.6 KiB
Python
# SPDX-License-Identifier: Apache-2.0
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#
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# The OpenSearch Contributors require contributions made to
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# this file be licensed under the Apache-2.0 license or a
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# compatible open source license.
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#
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# Modifications Copyright OpenSearch Contributors. See
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# GitHub history for details.
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import sys
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PY3 = sys.version_info[0] == 3
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class AWSV4SignerAsyncAuth:
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"""
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AWS V4 Request Signer for Async Requests.
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"""
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def __init__(self, credentials, region, service="es"): # type: ignore
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if not credentials:
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raise ValueError("Credentials cannot be empty")
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self.credentials = credentials
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if not region:
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raise ValueError("Region cannot be empty")
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self.region = region
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if not service:
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raise ValueError("Service name cannot be empty")
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self.service = service
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def __call__(self, method, url, query_string, body): # type: ignore
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return self._sign_request(method, url, query_string, body) # type: ignore
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def _sign_request(self, method, url, query_string, body):
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"""
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This method helps in signing the request by injecting the required headers.
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:param prepared_request: unsigned headers
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:return: signed headers
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"""
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from botocore.auth import SigV4Auth
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from botocore.awsrequest import AWSRequest
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# create an AWS request object and sign it using SigV4Auth
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aws_request = AWSRequest(
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method=method,
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url=url,
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data=body,
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)
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# credentials objects expose access_key, secret_key and token attributes
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# via @property annotations that call _refresh() on every access,
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# creating a race condition if the credentials expire before secret_key
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# is called but after access_key- the end result is the access_key doesn't
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# correspond to the secret_key used to sign the request. To avoid this,
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# get_frozen_credentials() which returns non-refreshing credentials is
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# called if it exists.
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credentials = (
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self.credentials.get_frozen_credentials()
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if hasattr(self.credentials, "get_frozen_credentials")
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and callable(self.credentials.get_frozen_credentials)
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else self.credentials
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)
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sig_v4_auth = SigV4Auth(credentials, self.service, self.region)
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sig_v4_auth.add_auth(aws_request)
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aws_request.headers["X-Amz-Content-SHA256"] = sig_v4_auth.payload(aws_request)
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# copy the headers from AWS request object into the prepared_request
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return dict(aws_request.headers.items())
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