auth azure: support access token

lisa/sut_orchestrator/azure/platform_.py

@@ -7,6 +7,7 @@
 import os
 import re
 import sys
+import time
 from copy import deepcopy
 from dataclasses import InitVar, dataclass, field
 from datetime import datetime
@@ -17,6 +18,7 @@
 from typing import Any, Dict, Iterable, List, Optional, Set, Tuple, Type, Union, cast
 
 import requests
+from azure.core.credentials import AccessToken, TokenCredential
 from azure.core.exceptions import HttpResponseError, ResourceNotFoundError
 from azure.identity import DefaultAzureCredential
 from azure.mgmt.compute.models import (
@@ -400,6 +402,29 @@ def cloud(self, value: Optional[CloudSchema]) -> None:
             self.cloud_raw = value.to_dict()  # type: ignore
 
 
+class StaticAccessTokenCredential(TokenCredential):
+    def __init__(self, token: str, expires_on: int) -> None:
+        """
+        Initialize StaticAccessTokenCredential with the provided token and expiry time.
+
+        :param token: The Azure access token as a string.
+        :param expires_on: The expiry time of the token as an integer (Unix timestamp).
+        """
+        self._token = token
+        self._expires_on = expires_on
+
+    def get_token(self, *scopes: str, **kwargs) -> AccessToken:
+        """
+        Get the access token for the specified scopes.
+
+        :param scopes: The OAuth 2.0 scopes the token applies to.
+        :param kwargs: Additional keyword arguments that may be required by the SDK.
+        :return: An AccessToken instance containing the token and its expiry time.
+        """
+        # You can choose to print or log the scopes and kwargs for debugging if needed
+        return AccessToken(self._token, self._expires_on)
+
+
 class AzurePlatform(Platform):
     _diagnostic_storage_container_pattern = re.compile(
         r"(https:\/\/)(?P<storage_name>.*)([.].*){4}\/(?P<container_name>.*)\/",
@@ -937,9 +962,19 @@ def _initialize_credential(self) -> None:
             if azure_runbook.service_principal_key:
                 os.environ["AZURE_CLIENT_SECRET"] = azure_runbook.service_principal_key
 
-            credential = DefaultAzureCredential(
-                authority=self.cloud.endpoints.active_directory,
-            )
+            if "AZURE_ACCESS_TOKEN" in os.environ:
+                token = os.environ["AZURE_ACCESS_TOKEN"]
+            else:
+                token = None
+
+            if token:
+                credential = StaticAccessTokenCredential(
+                    token, int(time.time()) + 3600 * 24
+                )
+            else:
+                credential = DefaultAzureCredential(
+                    authority=self.cloud.endpoints.active_directory,
+                )
 
             with SubscriptionClient(
                 credential,