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# ------------------------------------
# Copyright (c) Microsoft Corporation.
# Licensed under the MIT License.
# ------------------------------------
import functools
import os
from typing import Optional, Dict
from azure.core.pipeline.transport import HttpRequest
from .._constants import EnvironmentVariables
from .._internal.managed_identity_base import ManagedIdentityBase
from .._internal.managed_identity_client import ManagedIdentityClient
class AzureMLCredential(ManagedIdentityBase):
def get_client(self, **kwargs) -> Optional[ManagedIdentityClient]:
client_args = _get_client_args(**kwargs)
if client_args:
return ManagedIdentityClient(**client_args)
return None
def get_unavailable_message(self) -> str:
return "Azure ML managed identity configuration not found in environment"
def _get_client_args(**kwargs) -> Optional[Dict]:
identity_config = kwargs.pop("identity_config", None) or {}
url = os.environ.get(EnvironmentVariables.MSI_ENDPOINT)
secret = os.environ.get(EnvironmentVariables.MSI_SECRET)
if not (url and secret):
# Azure ML managed identity isn't available in this environment
return None
if kwargs.get("client_id"):
identity_config["clientid"] = kwargs.pop("client_id")
return dict(
kwargs,
_content_callback=_parse_expires_on,
identity_config=identity_config,
base_headers={"secret": secret},
request_factory=functools.partial(_get_request, url),
)
def _get_request(url: str, scope: str, identity_config: Dict) -> HttpRequest:
request = HttpRequest("GET", url)
request.format_parameters(dict({"api-version": "2017-09-01", "resource": scope}, **identity_config))
return request
def _parse_expires_on(content: Dict) -> None:
"""Parse an App Service MSI version 2017-09-01 expires_on value to epoch seconds.
This version of the API returns expires_on as a UTC datetime string rather than epoch seconds. The string's
format depends on the OS. Responses on Windows include AM/PM, for example "1/16/2020 5:24:12 AM +00:00".
Responses on Linux do not, for example "06/20/2019 02:57:58 +00:00".
:param dict content: a deserialized response from an App Service MSI.
:raises ValueError: ``expires_on`` didn't match an expected format
"""
# Azure ML sets the same environment variables as App Service but returns expires_on as an integer.
# That means we could have an Azure ML response here, so let's first try to parse expires_on as an int.
try:
content["expires_on"] = int(content["expires_on"])
return
except ValueError:
pass
import calendar
import time
expires_on = content["expires_on"]
if expires_on.endswith(" +00:00"):
date_string = expires_on[: -len(" +00:00")]
for format_string in ("%m/%d/%Y %H:%M:%S", "%m/%d/%Y %I:%M:%S %p"): # (Linux, Windows)
try:
t = time.strptime(date_string, format_string)
content["expires_on"] = calendar.timegm(t)
return
except ValueError:
pass
raise ValueError("'{}' doesn't match the expected format".format(expires_on))