From dc78afb1b357636cc24dfbc99ae3d7018c2fed37 Mon Sep 17 00:00:00 2001
From: Nick Craig-Wood <nick@craig-wood.com>
Date: Fri, 1 Aug 2025 15:37:53 +0100
Subject: [PATCH] oauthutil: warn if rclone authorize code can't be decoded
 #2732

---
 lib/oauthutil/oauthutil.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/oauthutil/oauthutil.go b/lib/oauthutil/oauthutil.go
index a44ae8028..9ec2fffca 100644
--- a/lib/oauthutil/oauthutil.go
+++ b/lib/oauthutil/oauthutil.go
@@ -692,6 +692,10 @@ version recommended):
 		newFormat := true
 		err := outM.Decode(code)
 		if err != nil {
+			if len(code) > 0 && code[0] != '{' {
+				fs.Errorf(nil, "Couldn't decode rclone authorize output as base64, trying JSON: %v", err)
+				fs.Errorf(nil, "Check the code is complete and didn't get truncated >>>%s<<<", code)
+			}
 			newFormat = false
 			err = json.Unmarshal([]byte(code), &token)
 		}