fix(core, a2a-server): prevent hang during OAuth in non-interactive sessions (#21045)

packages/core/src/code_assist/oauth2.test.ts

@@ -40,7 +40,10 @@ import { FORCE_ENCRYPTED_FILE_ENV_VAR } from '../mcp/token-storage/index.js';
 import { GEMINI_DIR, homedir as pathsHomedir } from '../utils/paths.js';
 import { debugLogger } from '../utils/debugLogger.js';
 import { writeToStdout } from '../utils/stdio.js';
-import { FatalCancellationError } from '../utils/errors.js';
+import {
+  FatalCancellationError,
+  FatalAuthenticationError,
+} from '../utils/errors.js';
 import process from 'node:process';
 import { coreEvents } from '../utils/events.js';
 import { isHeadlessMode } from '../utils/headless.js';
@@ -107,6 +110,7 @@ const mockConfig = {
   getProxy: () => 'http://test.proxy.com:8080',
   isBrowserLaunchSuppressed: () => false,
   getExperimentalZedIntegration: () => false,
+  isInteractive: () => true,
 } as unknown as Config;
 
 // Mock fetch globally
@@ -316,11 +320,31 @@ describe('oauth2', () => {
       await eventPromise;
     });
 
+    it('should throw FatalAuthenticationError in non-interactive session when manual auth is required', async () => {
+      const mockConfigNonInteractive = {
+        getNoBrowser: () => true,
+        getProxy: () => 'http://test.proxy.com:8080',
+        isBrowserLaunchSuppressed: () => true,
+        isInteractive: () => false,
+      } as unknown as Config;
+
+      await expect(
+        getOauthClient(AuthType.LOGIN_WITH_GOOGLE, mockConfigNonInteractive),
+      ).rejects.toThrow(FatalAuthenticationError);
+
+      await expect(
+        getOauthClient(AuthType.LOGIN_WITH_GOOGLE, mockConfigNonInteractive),
+      ).rejects.toThrow(
+        'Manual authorization is required but the current session is non-interactive.',
+      );
+    });
+
     it('should perform login with user code', async () => {
       const mockConfigWithNoBrowser = {
         getNoBrowser: () => true,
         getProxy: () => 'http://test.proxy.com:8080',
         isBrowserLaunchSuppressed: () => true,
+        isInteractive: () => true,
       } as unknown as Config;
 
       const mockCodeVerifier = {
@@ -391,6 +415,7 @@ describe('oauth2', () => {
         getNoBrowser: () => true,
         getProxy: () => 'http://test.proxy.com:8080',
         isBrowserLaunchSuppressed: () => true,
+        isInteractive: () => true,
       } as unknown as Config;
 
       const mockCodeVerifier = {
@@ -1171,6 +1196,7 @@ describe('oauth2', () => {
           getNoBrowser: () => true,
           getProxy: () => 'http://test.proxy.com:8080',
           isBrowserLaunchSuppressed: () => true,
+          isInteractive: () => true,
         } as unknown as Config;
 
         const mockOAuth2Client = {