nntp: append Archived-At and List-Archive headers

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

diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index a4cf25e29ae574f7d5b4ddf0ef49cd16dface2c7..3e0faaf96dd8f3f45e2f3e44696bec53aec2c771 100644 (file)
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -15,6 +15,7 @@ use Email::MIME;
 use Data::Dumper qw(Dumper);
 use POSIX qw(strftime);
 use Time::HiRes qw(clock_gettime CLOCK_MONOTONIC);
+use URI::Escape qw(uri_escape_utf8);
 use constant {
        r501 => '501 command syntax error',
        r221 => '221 Header follows',
@@ -426,6 +427,29 @@ sub cmd_quit ($) {
        undef;
 }
 
+sub header_append ($$$) {
+       my ($hdr, $k, $v) = @_;
+       my @v = $hdr->header($k);
+       foreach (@v) {
+               return if $v eq $_;
+       }
+       $hdr->header_set($k, @v, $v);
+}
+
+sub set_nntp_headers {
+       my ($hdr, $ng, $n, $mid) = @_;
+
+       # clobber some
+       $hdr->header_set('Newsgroups', $ng->{name});
+       $hdr->header_set('Xref', xref($ng, $n));
+       header_append($hdr, 'List-Post', "<mailto:$ng->{address}>");
+       if (my $url = $ng->{url}) {
+               $mid = uri_escape_utf8($mid);
+               header_append($hdr, 'Archived-At', "<$url$mid/>");
+               header_append($hdr, 'List-Archive', "<$url>");
+       }
+}
+
 sub art_lookup ($$$) {
        my ($self, $art, $set_headers) = @_;
        my $ng = $self->{ng};
@@ -468,8 +492,7 @@ found:
        return $err unless $s;
        my $lines;
        if ($set_headers) {
-               $s->header_set('Newsgroups', $ng->{name});
-               $s->header_set('Xref', xref($ng, $n));
+               set_nntp_headers($s->header_obj, $ng, $n, $mid);
                $lines = $s->body =~ tr!\n!\n!;
 
                # must be last