Added scope override sample for fabric testing. (#43009)

* Added scope overridesample for fabric.

* added a reference link

* Fix myPy

* Fix myPy

Author: aavasthy

sdk/cosmos/azure-cosmos/samples/access_fabric_with_overridenscope_aad.py

@@ -0,0 +1,93 @@
+# -------------------------------------------------------------------------
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License. See LICENSE.txt in the project root for
+# license information.
+# -------------------------------------------------------------------------
+import json
+import os
+import sys
+import traceback
+import uuid
+
+from azure.identity import DefaultAzureCredential, InteractiveBrowserCredential
+from azure.cosmos import CosmosClient
+import azure.cosmos.exceptions as exceptions
+from azure.cosmos.partition_key import PartitionKey
+import config
+
+# ----------------------------------------------------------------------------------------------------------
+# Prerequisites -
+#
+# 1. An Azure Cosmos account in fabric environment and database and container created.
+#    https://learn.microsoft.com/en-us/fabric/database/cosmos-db/overview
+# 2. Python packages (preview + identity) and login:
+#    pip install "azure-cosmos==4.14.0b3" azure-identity
+#    az login
+# ----------------------------------------------------------------------------------------------------------
+# Sample - demonstrates how to authenticate and use your database account using AAD credentials with Fabric.
+# Read more about operations allowed for this authorization method: https://aka.ms/cosmos-native-rbac
+# ----------------------------------------------------------------------------------------------------------
+# Note:
+# This sample assumes the database and container already exist.
+# It writes one item (PK path assumed to be "/pk") and reads it back.
+# ----------------------------------------------------------------------------------------------------------
+HOST = config.settings["host"]
+DATABASE_ID = config.settings["database_id"]
+CONTAINER_ID = config.settings["container_id"]
+PARTITION_KEY = PartitionKey(path="/pk")
+
+def get_test_item(num: int) -> dict:
+    return {
+        "id": f"Item_{num}",
+        "pk": "partition1",
+        "name": "Item 1",
+        "description": "This is item 1",
+        "runId": str(uuid.uuid4())
+    }
+
+
+def run_sample():
+    # if you want to override scope for AAD authentication.
+    #os.environ["AZURE_COSMOS_AAD_SCOPE_OVERRIDE"] = "https://cosmos.azure.com/.default"
+
+    # AAD auth works with az login
+    aad_credentials = InteractiveBrowserCredential()
+
+    # Use your credentials to authenticate your client.
+    aad_client = CosmosClient(HOST, aad_credentials)
+
+    # Do R/W data operations with your authorized AAD client.
+    db = aad_client.get_database_client(DATABASE_ID)
+    container = db.get_container_client(CONTAINER_ID)
+
+    # Create item
+    item = get_test_item(0)
+    container.create_item(item)
+    print("Created item:", item["id"])
+
+    # Read item
+    read_doc = container.read_item(item=item["id"], partition_key=item["pk"])
+    print("Point read:\n" + json.dumps(read_doc, indent=2))
+
+
+def main():
+    try:
+        run_sample()
+    except exceptions.CosmosHttpResponseError as e:
+        print(f"CosmosHttpResponseError: {getattr(e, 'status_code', None)} - {e}")
+        resp = getattr(e, "response", None)
+        if resp is not None and getattr(resp, "headers", None) is not None:
+            try:
+                print("Response headers:\n" + json.dumps(dict(resp.headers), indent=2))
+            except Exception:
+                pass
+        traceback.print_exc()
+        raise
+    except Exception as ex:
+        print(f"Exception: {ex}")
+        traceback.print_exc()
+        sys.exit(1)
+
+
+if __name__ == "__main__":
+    main()