fix: Ensure consistent ADC quota project override in ADK

Fix discovery engine search tool, bigquery agent analytics plugin, and application integration tool to correctly handle the ADC quota project override -- the x-goog-user-project should be set based on the ADC quota project, per gcloud auth team's requirements.

Co-authored-by: Kathy Wu <wukathy@google.com>
PiperOrigin-RevId: 853841124

src/google/adk/plugins/bigquery_agent_analytics_plugin.py

@@ -36,6 +36,7 @@ from typing import TYPE_CHECKING
 import uuid
 import weakref
 
+from google.api_core import client_options
 from google.api_core.exceptions import InternalServerError
 from google.api_core.exceptions import ServiceUnavailable
 from google.api_core.exceptions import TooManyRequests
@@ -1352,19 +1353,31 @@ class BigQueryAgentAnalyticsPlugin(BasePlugin):
         if _GLOBAL_WRITE_CLIENT is None:
 
           def get_credentials():
-            creds, _ = google.auth.default(
+            creds, project_id = google.auth.default(
                 scopes=["https://www.googleapis.com/auth/cloud-platform"]
             )
-            return creds
+            return creds, project_id
 
-          creds = await loop.run_in_executor(self._executor, get_credentials)
+          creds, project_id = await loop.run_in_executor(
+              self._executor, get_credentials
+          )
+          quota_project_id = (
+              getattr(creds, "quota_project_id", None) or project_id
+          )
+          options = (
+              client_options.ClientOptions(quota_project_id=quota_project_id)
+              if quota_project_id
+              else None
+          )
           client_info = gapic_client_info.ClientInfo(
               user_agent=f"google-adk-bq-logger/{__version__}"
           )
           # Initialize the async client in the current event loop, not in the
           # executor.
           _GLOBAL_WRITE_CLIENT = BigQueryWriteAsyncClient(
-              credentials=creds, client_info=client_info
+              credentials=creds,
+              client_info=client_info,
+              client_options=options,
           )
         self.write_client = _GLOBAL_WRITE_CLIENT
 

src/google/adk/tools/application_integration_tool/clients/integration_client.py

@@ -75,6 +75,7 @@ class IntegrationClient:
     self.actions = actions if actions is not None else []
     self.service_account_json = service_account_json
     self.credential_cache = None
+    self._quota_project_id = None
 
   def get_openapi_spec_for_integration(self):
     """Gets the OpenAPI spec for the integration.
@@ -92,6 +93,8 @@ class IntegrationClient:
           "Content-Type": "application/json",
           "Authorization": f"Bearer {self._get_access_token()}",
       }
+      if not self.service_account_json:
+        headers["x-goog-user-project"] = self._quota_project_id or self.project
       data = {
           "apiTriggerResources": [
               {
@@ -247,11 +250,14 @@ class IntegrationClient:
       )
     else:
       try:
-        credentials, _ = default_service_credential(
+        credentials, project_id = default_service_credential(
             scopes=["https://www.googleapis.com/auth/cloud-platform"]
         )
       except:
         credentials = None
+      if credentials:
+        quota_project_id = getattr(credentials, "quota_project_id", None)
+        self._quota_project_id = quota_project_id or project_id
 
     if not credentials:
       raise ValueError(

src/google/adk/tools/discovery_engine_search_tool.py

@@ -17,6 +17,7 @@ from __future__ import annotations
 from typing import Any
 from typing import Optional
 
+from google.api_core import client_options
 from google.api_core.exceptions import GoogleAPICallError
 import google.auth
 from google.cloud import discoveryengine_v1beta as discoveryengine
@@ -72,8 +73,14 @@ class DiscoveryEngineSearchTool(FunctionTool):
     self._max_results = max_results
 
     credentials, _ = google.auth.default()
+    quota_project_id = getattr(credentials, "quota_project_id", None)
+    options = (
+        client_options.ClientOptions(quota_project_id=quota_project_id)
+        if quota_project_id
+        else None
+    )
     self._discovery_engine_client = discoveryengine.SearchServiceClient(
-        credentials=credentials
+        credentials=credentials, client_options=options
     )
 
   def discovery_engine_search(

tests/unittests/plugins/test_bigquery_agent_analytics_plugin.py

@@ -1568,6 +1568,41 @@ class TestBigQueryAgentAnalyticsPlugin:
     await plugin2.shutdown()
     bigquery_agent_analytics_plugin._GLOBAL_WRITE_CLIENT = None
 
+  @pytest.mark.asyncio
+  async def test_quota_project_id_used_in_client(
+      self,
+      mock_bq_client,
+      mock_to_arrow_schema,
+      mock_asyncio_to_thread,
+  ):
+    bigquery_agent_analytics_plugin._GLOBAL_WRITE_CLIENT = None
+    mock_creds = mock.create_autospec(
+        google.auth.credentials.Credentials, instance=True, spec_set=True
+    )
+    mock_creds.quota_project_id = "quota-project"
+    with mock.patch.object(
+        google.auth,
+        "default",
+        autospec=True,
+        return_value=(mock_creds, PROJECT_ID),
+    ) as mock_auth_default:
+      with mock.patch.object(
+          bigquery_agent_analytics_plugin,
+          "BigQueryWriteAsyncClient",
+          autospec=True,
+      ) as mock_bq_write_cls:
+        plugin = bigquery_agent_analytics_plugin.BigQueryAgentAnalyticsPlugin(
+            project_id=PROJECT_ID,
+            dataset_id=DATASET_ID,
+            table_id=TABLE_ID,
+        )
+        await plugin._ensure_started()
+        mock_auth_default.assert_called_once()
+        mock_bq_write_cls.assert_called_once()
+        _, kwargs = mock_bq_write_cls.call_args
+        assert kwargs["client_options"].quota_project_id == "quota-project"
+        bigquery_agent_analytics_plugin._GLOBAL_WRITE_CLIENT = None
+
   @pytest.mark.asyncio
   async def test_pickle_safety(self, mock_auth_default, mock_bq_client):
     """Test that the plugin can be pickled safely."""

tests/unittests/tools/application_integration_tool/clients/test_integration_client.py

@@ -16,6 +16,7 @@ import json
 import re
 from unittest import mock
 
+from google.adk.tools.application_integration_tool.clients import integration_client
 from google.adk.tools.application_integration_tool.clients.connections_client import ConnectionsClient
 from google.adk.tools.application_integration_tool.clients.integration_client import IntegrationClient
 import google.auth
@@ -110,6 +111,8 @@ class TestIntegrationClient:
       mock_credentials,
       mock_connections_client,
   ):
+    mock_credentials.quota_project_id = "quota-project"
+    mock_credentials.expired = False
     expected_spec = {"openapi": "3.0.0", "info": {"title": "Test Integration"}}
     mock_response = mock.MagicMock()
     mock_response.status_code = 200
@@ -117,11 +120,12 @@ class TestIntegrationClient:
 
     with (
         mock.patch.object(
-            IntegrationClient,
-            "_get_access_token",
-            return_value=mock_credentials.token,
+            integration_client,
+            "default_service_credential",
+            return_value=(mock_credentials, project),
         ),
-        mock.patch("requests.post", return_value=mock_response),
+        mock.patch.object(mock_credentials, "refresh", return_value=None),
+        mock.patch.object(requests, "post", return_value=mock_response),
     ):
       client = IntegrationClient(
           project=project,
@@ -140,6 +144,7 @@ class TestIntegrationClient:
           headers={
               "Content-Type": "application/json",
               "Authorization": f"Bearer {mock_credentials.token}",
+              "x-goog-user-project": "quota-project",
           },
           json={
               "apiTriggerResources": [{

tests/unittests/tools/test_discovery_engine_search_tool.py

@@ -14,11 +14,14 @@
 
 from unittest import mock
 
+from google.adk.tools import discovery_engine_search_tool
 from google.adk.tools.discovery_engine_search_tool import DiscoveryEngineSearchTool
 from google.api_core import exceptions
 from google.cloud import discoveryengine_v1beta as discoveryengine
 import pytest
 
+from google import auth
+
 
 @mock.patch(
     "google.auth.default",
@@ -76,10 +79,14 @@ class TestDiscoveryEngineSearchTool:
           data_store_id="test_data_store", data_store_specs=[{"id": "123"}]
       )
 
-  @mock.patch(
-      "google.cloud.discoveryengine_v1beta.SearchServiceClient",
+  @mock.patch.object(discovery_engine_search_tool, "client_options")
+  @mock.patch.object(
+      discoveryengine,
+      "SearchServiceClient",
   )
-  def test_discovery_engine_search_success(self, mock_search_client):
+  def test_discovery_engine_search_success(
+      self, mock_search_client, mock_client_options
+  ):
     """Test successful discovery engine search."""
     mock_response = discoveryengine.SearchResponse()
     mock_response.results = [
@@ -98,15 +105,28 @@ class TestDiscoveryEngineSearchTool:
         )
     ]
     mock_search_client.return_value.search.return_value = mock_response
+    mock_credentials = mock.MagicMock()
+    mock_credentials.quota_project_id = "test-quota-project"
 
-    tool = DiscoveryEngineSearchTool(data_store_id="test_data_store")
-    result = tool.discovery_engine_search("test query")
+    with mock.patch.object(
+        auth, "default", return_value=(mock_credentials, "project")
+    ) as mock_auth:
+      tool = DiscoveryEngineSearchTool(data_store_id="test_data_store")
+      result = tool.discovery_engine_search("test query")
 
-    assert result["status"] == "success"
-    assert len(result["results"]) == 1
-    assert result["results"][0]["title"] == "Test Title"
-    assert result["results"][0]["url"] == "http://example.com"
-    assert result["results"][0]["content"] == "Test Content"
+      assert result["status"] == "success"
+      assert len(result["results"]) == 1
+      assert result["results"][0]["title"] == "Test Title"
+      assert result["results"][0]["url"] == "http://example.com"
+      assert result["results"][0]["content"] == "Test Content"
+      mock_auth.assert_called_once()
+      mock_client_options.ClientOptions.assert_called_once_with(
+          quota_project_id="test-quota-project"
+      )
+      mock_search_client.assert_called_once_with(
+          credentials=mock_credentials,
+          client_options=mock_client_options.ClientOptions.return_value,
+      )
 
   @mock.patch(
       "google.cloud.discoveryengine_v1beta.SearchServiceClient",