From a4b024ec39a77ca2c57deee6f5727b55676d8b0e Mon Sep 17 00:00:00 2001
From: Christopher Angelo <angelo@angeloanan.xyz>
Date: Fri, 2 May 2025 12:50:16 +0700
Subject: [PATCH] fix(examples/gmail): forcefully wait for server greeting
 before auth

---
 examples/src/bin/gmail_oauth2.rs | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/examples/src/bin/gmail_oauth2.rs b/examples/src/bin/gmail_oauth2.rs
index 7e52298..0bece23 100644
--- a/examples/src/bin/gmail_oauth2.rs
+++ b/examples/src/bin/gmail_oauth2.rs
@@ -37,6 +37,15 @@ async fn main() -> Result<()> {
     let tls_stream = tls.connect(domain, tcp_stream).await?;
     let client = async_imap::Client::new(tls_stream);
 
+    // Gmail's IMAP server will send a server greeting before taking in any message
+    // Here, we forcefully wait and read a line before sending authentication data
+    //
+    // See #84
+    let _greeting = client
+        .read_response()
+        .await?
+        .expect("unexpected end of stream, expected greeting");
+
     let mut imap_session = match client.authenticate("XOAUTH2", &gmail_auth).await {
         Ok(c) => c,
         Err((e, _unauth_client)) => {