feat(auth): support gemini api key and vertex auth in non-interactive mode (#4631)

packages/cli/src/validateNonInterActiveAuth.ts

@@ -0,0 +1,38 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { AuthType, Config } from '@google/gemini-cli-core';
+import { USER_SETTINGS_PATH } from './config/settings.js';
+import { validateAuthMethod } from './config/auth.js';
+
+export async function validateNonInteractiveAuth(
+  configuredAuthType: AuthType | undefined,
+  nonInteractiveConfig: Config,
+) {
+  const effectiveAuthType =
+    configuredAuthType ||
+    (process.env.GOOGLE_GENAI_USE_VERTEXAI === 'true'
+      ? AuthType.USE_VERTEX_AI
+      : process.env.GEMINI_API_KEY
+        ? AuthType.USE_GEMINI
+        : undefined);
+
+  if (!effectiveAuthType) {
+    console.error(
+      `Please set an Auth method in your ${USER_SETTINGS_PATH} or specify either the GEMINI_API_KEY or GOOGLE_GENAI_USE_VERTEXAI environment variables before running`,
+    );
+    process.exit(1);
+  }
+
+  const err = validateAuthMethod(effectiveAuthType);
+  if (err != null) {
+    console.error(err);
+    process.exit(1);
+  }
+
+  await nonInteractiveConfig.refreshAuth(effectiveAuthType);
+  return nonInteractiveConfig;
+}