From 7bdfb48c3f2c1084f2a7112e039bc0ca0d42c1c1 Mon Sep 17 00:00:00 2001
From: Manos Pitsidianakis <manos@pitsidianak.is>
Date: Tue, 25 Jun 2024 15:26:51 +0300
Subject: [PATCH] imap: use spec compliant continuation request

cmd_authenticate() replies to AUTHENTICATE commands with "+" CRLF but
the imap4rev1 RFC [^0] defines the following ABNF syntax for a continuation
request:

	continue-req    = "+" SP (resp-text / base64) CRLF

A space (SP) is required before CRLF.

[0]: https://www.rfc-editor.org/rfc/rfc3501#page-84

Signed-off-by: Manos Pitsidianakis <manos@pitsidianak.is>
---
 lib/PublicInbox/IMAP.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/PublicInbox/IMAP.pm b/lib/PublicInbox/IMAP.pm
index 0eb21b6a2..378a0363e 100644
--- a/lib/PublicInbox/IMAP.pm
+++ b/lib/PublicInbox/IMAP.pm
@@ -158,7 +158,7 @@ sub cmd_logout ($$) {
 sub cmd_authenticate ($$$) {
 	my ($self, $tag) = @_; # $method = $_[2], should be "ANONYMOUS"
 	$self->{-login_tag} = $tag;
-	"+\r\n"; # challenge
+	"+ \r\n"; # challenge
 }
 
 sub cmd_capability ($$) {
-- 
2.47.3