From 5769d488526b88a394b4b6741e77dd0e7441d248 Mon Sep 17 00:00:00 2001
From: Eric Wong <e@80x24.org>
Date: Sun, 30 Jun 2019 04:27:55 +0000
Subject: nntp: add support for CAPABILITIES command

Some clients may rely on this for STARTTLS support.
---
 lib/PublicInbox/NNTP.pm | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'lib/PublicInbox/NNTP.pm')

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 57a67a50..d106e315 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -31,6 +31,14 @@ my @OVERVIEW = qw(Subject From Date Message-ID References Xref);
 my $OVERVIEW_FMT = join(":\r\n", @OVERVIEW, qw(Bytes Lines)) . ":\r\n";
 my $LIST_HEADERS = join("\r\n", @OVERVIEW,
 			qw(:bytes :lines Xref To Cc)) . "\r\n";
+my $CAPABILITIES = <<"";
+101 Capability list:\r
+VERSION 2\r
+READER\r
+NEWNEWS\r
+LIST ACTIVE ACTIVE.TIMES NEWSGROUPS OVERVIEW.FMT\r
+HDR\r
+OVER\r
 
 my $EXPMAP; # fd -> [ idle_time, $self ]
 my $expt;
@@ -121,6 +129,17 @@ sub process_line ($$) {
 	res($self, $res);
 }
 
+# The keyword argument is not used (rfc3977 5.2.2)
+sub cmd_capabilities ($;$) {
+	my ($self, undef) = @_;
+	my $res = $CAPABILITIES;
+	if (ref($self->{sock}) ne 'IO::Socket::SSL' &&
+			$self->{nntpd}->{accept_tls}) {
+		$res .= "STARTTLS\r\n";
+	}
+	$res .= '.';
+}
+
 sub cmd_mode ($$) {
 	my ($self, $arg) = @_;
 	$arg = uc $arg;
-- 
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