From 6e38096f1a7be3607ce373af1577335093513a09 Mon Sep 17 00:00:00 2001
From: Remi Rousselet <darky12s@gmail.com>
Date: Fri, 20 Oct 2023 12:15:25 +0200
Subject: [PATCH] Improve login fail message

Fixes #572
---
 googleapis_auth/lib/auth_io.dart | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/googleapis_auth/lib/auth_io.dart b/googleapis_auth/lib/auth_io.dart
index f99f70e85..9e60f7662 100644
--- a/googleapis_auth/lib/auth_io.dart
+++ b/googleapis_auth/lib/auth_io.dart
@@ -92,7 +92,18 @@ Future<AutoRefreshingAuthClient> clientViaApplicationDefaultCredentials({
     );
   }
 
-  return await clientViaMetadataServer(baseClient: baseClient);
+  try {
+    return await clientViaMetadataServer(baseClient: baseClient);
+  } on Exception catch (err, stack) {
+    Error.throwWithStackTrace(
+      Exception(
+        'Failed to load Application Default Credentials. '
+        'Make sure you are logged in with `firebase` or `gcloud` CLI, '
+        'or your code is running on Google Compute Engine/Google App Engine.',
+      ),
+      stack,
+    );
+  }
 }
 
 /// Obtains oauth2 credentials and returns an authenticated HTTP client.