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Directory : /lib/python3/dist-packages/uaclient/clouds/

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Current File : /lib/python3/dist-packages/uaclient/clouds/aws.py

from typing import Any, Dict
from urllib.error import HTTPError

from uaclient import util
from uaclient.clouds import AutoAttachCloudInstance

IMDS_V2_TOKEN_URL = "http://169.254.169.254/latest/api/token"
IMDS_URL = "http://169.254.169.254/latest/dynamic/instance-identity/pkcs7"
SYS_HYPERVISOR_PRODUCT_UUID = "/sys/hypervisor/uuid"
DMI_PRODUCT_SERIAL = "/sys/class/dmi/id/product_serial"
DMI_PRODUCT_UUID = "/sys/class/dmi/id/product_uuid"

AWS_TOKEN_TTL_SECONDS = "21600"
AWS_TOKEN_PUT_HEADER = "X-aws-ec2-metadata-token"
AWS_TOKEN_REQ_HEADER = AWS_TOKEN_PUT_HEADER + "-ttl-seconds"


class UAAutoAttachAWSInstance(AutoAttachCloudInstance):

    _api_token = None

    # mypy does not handle @property around inner decorators
    # https://github.com/python/mypy/issues/1362
    @property  # type: ignore
    @util.retry(HTTPError, retry_sleeps=[1, 2, 5])
    def identity_doc(self) -> Dict[str, Any]:
        headers = self._get_imds_v2_token_headers()
        response, _headers = util.readurl(IMDS_URL, headers=headers)
        return {"pkcs7": response}

    @util.retry(HTTPError, retry_sleeps=[1, 2, 5])
    def _get_imds_v2_token_headers(self):
        if self._api_token == "IMDSv1":
            return None
        elif self._api_token:
            return {AWS_TOKEN_PUT_HEADER: self._api_token}
        try:
            response, _headers = util.readurl(
                IMDS_V2_TOKEN_URL,
                method="PUT",
                headers={AWS_TOKEN_REQ_HEADER: AWS_TOKEN_TTL_SECONDS},
            )
        except HTTPError as e:
            if e.code == 404:
                self._api_token = "IMDSv1"
                return None
            else:
                raise
        self._api_token = response
        return {AWS_TOKEN_PUT_HEADER: self._api_token}

    @property
    def cloud_type(self) -> str:
        return "aws"

    @property
    def is_viable(self) -> bool:
        """This machine is a viable AWSInstance"""
        try:
            hypervisor_uuid = util.load_file(SYS_HYPERVISOR_PRODUCT_UUID)
            if "ec2" == hypervisor_uuid[0:3]:
                return True
        except FileNotFoundError:
            # SYS_HYPERVISOR_PRODUCT_UUID isn't present on all EC2 instance
            # types, fall through
            pass
        # Both DMI product_uuid and product_serial start with 'ec2'
        dmi_uuid = util.load_file(DMI_PRODUCT_UUID).lower()
        dmi_serial = util.load_file(DMI_PRODUCT_SERIAL).lower()
        if "ec2" == dmi_uuid[0:3] == dmi_serial[0:3]:
            return True
        return False

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