1 files changed, 19 insertions, 0 deletions
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;