bigquery bugfixes

packages/data-source/src/adapters/bigquery.test.ts

@@ -81,6 +81,32 @@ describe('BigQueryAdapter', () => {
       await expect(adapter.initialize(credentials)).resolves.not.toThrow();
     });
 
+    it('should handle service account key as parsed object', async () => {
+      const serviceAccountObject = {
+        type: 'service_account',
+        project_id: 'test-project',
+        private_key_id: 'key123',
+        private_key: '-----BEGIN PRIVATE KEY-----\ntest\n-----END PRIVATE KEY-----',
+        client_email: 'test@test-project.iam.gserviceaccount.com',
+      };
+
+      const credentials: BigQueryCredentials = {
+        type: DataSourceType.BigQuery,
+        project_id: 'test-project',
+        service_account_key: serviceAccountObject,
+      };
+
+      await adapter.initialize(credentials);
+
+      const { BigQuery } = await import('@google-cloud/bigquery');
+      expect(BigQuery).toHaveBeenCalledWith(
+        expect.objectContaining({
+          projectId: 'test-project',
+          credentials: serviceAccountObject,
+        })
+      );
+    });
+
     it('should allow initialization without credentials (uses ADC)', async () => {
       const credentials: BigQueryCredentials = {
         type: DataSourceType.BigQuery,

packages/data-source/src/adapters/bigquery.ts

@@ -31,6 +31,10 @@ export class BigQueryAdapter extends BaseAdapter {
 
       // Handle service account authentication
       if (bigqueryCredentials.service_account_key) {
+        // Check if it's already an object
+        if (typeof bigqueryCredentials.service_account_key === 'object') {
+          options.credentials = bigqueryCredentials.service_account_key;
+        } else if (typeof bigqueryCredentials.service_account_key === 'string') {
           try {
             // Try to parse as JSON string
             const keyData = JSON.parse(bigqueryCredentials.service_account_key);
@@ -39,6 +43,7 @@ export class BigQueryAdapter extends BaseAdapter {
             // If parsing fails, treat as file path
             options.keyFilename = bigqueryCredentials.service_account_key;
           }
+        }
       } else if (bigqueryCredentials.key_file_path) {
         options.keyFilename = bigqueryCredentials.key_file_path;
       }

packages/data-source/src/types/credentials.ts

@@ -53,8 +53,8 @@ export interface BigQueryCredentials {
   /** Google Cloud project ID */
   project_id: string;
 
-  /** Service account key JSON (as string) or path to key file */
-  service_account_key?: string;
+  /** Service account key - can be JSON string, parsed object, or path to key file */
+  service_account_key?: string | Record<string, unknown>;
 
   /** Path to service account key file */
   key_file_path?: string;