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-rw-r--r--lib/PublicInbox/NNTP.pm7
-rw-r--r--t/nntpd.t20
2 files changed, 27 insertions, 0 deletions
diff --git a/lib/PublicInbox/NNTP.pm b/lib/PublicInbox/NNTP.pm
index 1d07220d..d409e782 100644
--- a/lib/PublicInbox/NNTP.pm
+++ b/lib/PublicInbox/NNTP.pm
@@ -519,6 +519,13 @@ sub _header ($) {
         my $hdr = $_[0]->header_obj->as_string;
         utf8::encode($hdr);
         $hdr =~ s/(?<!\r)\n/\r\n/sg;
+
+        # for leafnode compatibility, we need to ensure Message-ID headers
+        # are only a single line.  We can't subclass Email::Simple::Header
+        # and override _default_fold_at in here, either; since that won't
+        # affect messages already in the archive.
+        $hdr =~ s/^(Message-ID:)[ \t]*\r\n[ \t]+([^\r]+)\r\n/$1 $2\r\n/igsm;
+
         $hdr
 }
 
diff --git a/t/nntpd.t b/t/nntpd.t
index c73cc122..cce21eeb 100644
--- a/t/nntpd.t
+++ b/t/nntpd.t
@@ -231,6 +231,26 @@ EOF
                 ok($date >= $t0, 'valid date after start');
                 ok($date <= $t1, 'valid date before stop');
         }
+        if ('leafnode interop') {
+                my $for_leafnode = PublicInbox::MIME->new(<<"");
+From: longheader\@example.com
+To: $addr
+Subject: none
+Date: Fri, 02 Oct 1993 00:00:00 +0000
+
+                my $long_hdr = 'for-leafnode-'.('y'x200).'@example.com';
+                $for_leafnode->header_set('Message-ID', "<$long_hdr>");
+                $im->add($for_leafnode);
+                $im->done;
+                if ($version == 1) {
+                        my $s = PublicInbox::SearchIdx->new($mainrepo, 1);
+                        $s->index_sync;
+                }
+                my $hdr = $n->head("<$long_hdr>");
+                my $expect = qr/\AMessage-ID: /i . qr/\Q<$long_hdr>\E/;
+                ok(scalar(grep(/$expect/, @$hdr)), 'Message-ID not folded');
+                ok(scalar(grep(/^Path:/, @$hdr)), 'Path: header found');
+        }
 
         # pipelined requests:
         {