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-rw-r--r--lib/PublicInbox/NNTP.pm23
1 files changed, 22 insertions, 1 deletions
diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 631fd3c7..d6f315ba 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -20,6 +20,7 @@ use Time::Local qw(timegm timelocal);
 use constant {
         LINE_MAX => 512, # RFC 977 section 2.3
         r501 => '501 command syntax error',
+        r502 => '502 Command unavailable',
         r221 => '221 Header follows',
         r224 => '224 Overview information follows (multi-line)',
         r225 =>        '225 Headers follow (multi-line)',
@@ -41,6 +42,7 @@ LIST ACTIVE ACTIVE.TIMES NEWSGROUPS OVERVIEW.FMT\r
 HDR\r
 OVER\r
 
+my $have_deflate;
 my $EXPMAP; # fd -> [ idle_time, $self ]
 my $expt;
 our $EXPTIME = 180; # 3 minutes
@@ -897,11 +899,13 @@ sub cmd_xover ($;$) {
         });
 }
 
+sub compressed { undef }
+
 sub cmd_starttls ($) {
         my ($self) = @_;
         my $sock = $self->{sock} or return;
         # RFC 4642 2.2.1
-        (ref($sock) eq 'IO::Socket::SSL') and return '502 Command unavailable';
+        return r502 if (ref($sock) eq 'IO::Socket::SSL' || $self->compressed);
         my $opt = $self->{nntpd}->{accept_tls} or
                 return '580 can not initiate TLS negotiation';
         res($self, '382 Continue with TLS negotiation');
@@ -910,6 +914,17 @@ sub cmd_starttls ($) {
         undef;
 }
 
+# RFC 8054
+sub cmd_compress ($$) {
+        my ($self, $alg) = @_;
+        return '503 Only the DEFLATE is supported' if uc($alg) ne 'DEFLATE';
+        return r502 if $self->compressed || !$have_deflate;
+        res($self, '206 Compression active');
+        PublicInbox::NNTPdeflate->enable($self);
+        $self->requeue;
+        undef
+}
+
 sub cmd_xpath ($$) {
         my ($self, $mid) = @_;
         return r501 unless $mid =~ /\A<(.+)>\z/;
@@ -997,4 +1012,10 @@ sub busy {
         ($self->{rbuf} || $self->{wbuf} || not_idle_long($self, $now));
 }
 
+# this is an import to prevent "perl -c" from complaining about fields
+sub import {
+        $have_deflate = eval { require PublicInbox::NNTPdeflate } and
+                $CAPABILITIES .= "COMPRESS DEFLATE\r\n";
+}
+
 1;