From 9f73b58f78fdaa484241547c96d344bdf29fc7cb Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sun, 29 Jan 2023 22:58:34 +0000
Subject: lei_input: give a hint for upper-case in labels

I just encountered this error in xt/lei-auth-fail.t
---
 lib/PublicInbox/LeiInput.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/PublicInbox/LeiInput.pm b/lib/PublicInbox/LeiInput.pm
index c258f824..b6c2b6bb 100644
--- a/lib/PublicInbox/LeiInput.pm
+++ b/lib/PublicInbox/LeiInput.pm
@@ -30,6 +30,8 @@ my %ERR = (
 		my ($label) = @_;
 		length($label) >= $L_MAX and
 			return "`$label' too long (must be <= $L_MAX)";
+		$label =~ /[A-Z]/ and
+			return "`$label' must be lowercase";
 		$label =~ m{\A[a-z0-9_](?:[a-z0-9_\-\./\@,]*[a-z0-9])?\z} ?
 			undef : "`$label' is invalid";
 	},
-- 
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