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��h��@s>dZddlZddlmZddlZddlZddlmZddl	Z	ddl
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This module provides credentials to access Google Cloud resources from Amazon
Web Services (AWS) workloads. These credentials are recommended over the
use of service account credentials in AWS as they do not involve the management
of long-live service account private keys.

AWS Credentials are initialized using external_account arguments which are
typically loaded from the external credentials JSON file.

This module also provides a definition for an abstract AWS security credentials supplier.
This supplier can be implemented to return valid AWS security credentials and an AWS region
and used to create AWS credentials. The credentials will then call the
supplier instead of using pre-defined methods such as calling the EC2 metadata endpoints.

This module also provides a basic implementation of the
`AWS Signature Version 4`_ request signing algorithm.

AWS Credentials use serialized signed requests to the
`AWS STS GetCallerIdentity`_ API that can be exchanged for Google access tokens
via the GCP STS endpoint.

.. _AWS Signature Version 4: https://docs.aws.amazon.com/general/latest/gr/signature-version-4.html
.. _AWS STS GetCallerIdentity: https://docs.aws.amazon.com/STS/latest/APIReference/API_GetCallerIdentity.html
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            url (str): The AWS service URL containing the canonical URI and
                query string.
            method (str): The HTTP method used to call this API.
            request_payload (Optional[str]): The optional request payload if
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        date_stamp (str): The '%Y%m%d' date format.
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        canonical_querystring (str): The AWS service URL query string.
        method (str): The HTTP method used to call this API.
        region (str): The AWS region.
        aws_security_credentials (AWSSecurityCredentials): The AWS security credentials.
        request_payload (Optional[str]): The optional request payload if
            available.
        additional_headers (Optional[Mapping[str, str]]): The optional
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            request (google.auth.transport.Request): The object used to make
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�|�}|S)aJRetrieves the AWS security credentials required for signing AWS
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                server security_credentials endpoint in order to return the
                credentials.
            imdsv2_session_token (str): The AWS IMDSv2 session token to be added as a
                header in the requests to AWS metadata endpoint.

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            request (google.auth.transport.Request): A callable used to make
                HTTP requests.
            imdsv2_session_token (str): The AWS IMDSv2 session token to be added as a
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�|���||_d|_dS)u�	Instantiates an AWS workload external account credentials object.

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                    “urn:ietf:params:aws:token-type:aws4_request”

            token_url (Optional [str]): The STS endpoint URL. If not provided, will default to "https://sts.googleapis.com/v1/token".
            credential_source (Optional [Mapping]): The credential source dictionary used
                to provide instructions on how to retrieve external credential to be exchanged for Google access tokens.
                Either a credential source or an AWS security credentials supplier must be provided.

                Example credential_source for AWS credential::

                    {
                        "environment_id": "aws1",
                        "regional_cred_verification_url": "https://sts.{region}.amazonaws.com?Action=GetCallerIdentity&Version=2011-06-15",
                        "region_url": "http://169.254.169.254/latest/meta-data/placement/availability-zone",
                        "url": "http://169.254.169.254/latest/meta-data/iam/security-credentials",
                        imdsv2_session_token_url": "http://169.254.169.254/latest/api/token"
                    }

            aws_security_credentials_supplier (Optional [AwsSecurityCredentialsSupplier]): Optional AWS security credentials supplier.
                This will be called to supply valid AWS security credentails which will then
                be exchanged for Google access tokens. Either an AWS security credentials supplier
                or a credential source must be provided.
            args (List): Optional positional arguments passed into the underlying :meth:`~external_account.Credentials.__init__` method.
            kwargs (Mapping): Optional keyword arguments passed into the underlying :meth:`~external_account.Credentials.__init__` method.

        Raises:
            google.auth.exceptions.RefreshError: If an error is encountered during
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d��S)aiRetrieves the subject token using the credential_source object.
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        environment variable or from the AWS metadata server availability-zone
        if not found in the environment variable.

        Check AWS credentials in environment variables. If not found, retrieve
        from the AWS metadata server security-credentials endpoint.

        When retrieving AWS credentials from the metadata server
        security-credentials endpoint, the AWS role needs to be determined by
        calling the security-credentials endpoint without any argument. Then the
        credentials can be retrieved via: security-credentials/role_name

        Generate the signed request to AWS STS GetCallerIdentity action.

        Inject x-goog-cloud-target-resource into header and serialize the
        signed request. This will be the subject-token to pass to GCP STS.

        .. _AWS GetCallerIdentity signed request:
            https://cloud.google.com/iam/docs/access-resources-aws#exchange-token

        Args:
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