nntp: add support for CAPABILITIES command

[public-inbox.git] / lib / PublicInbox / NNTP.pm

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 57a67a50ff8475f1882a4aa6a90aa2e477c1d4cc..d106e3158e32f73396c33585bbebf9772849456e 100644 (file)
--- 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;