add filter for gmane archives

[public-inbox.git] / lib / PublicInbox / Filter / Gmane.pm

diff --git a/lib/PublicInbox/Filter/Gmane.pm b/lib/PublicInbox/Filter/Gmane.pm
new file mode 100644 (file)
index 0000000..f9042df
--- /dev/null
+++ b/lib/PublicInbox/Filter/Gmane.pm
@@ -0,0 +1,41 @@
+# Copyright (C) 2018 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+
+# Filter for importing some archives from gmane
+package PublicInbox::Filter::Gmane;
+use base qw(PublicInbox::Filter::Base);
+use strict;
+use warnings;
+
+sub scrub {
+       my ($self, $mime) = @_;
+       my $hdr = $mime->header_obj;
+
+       # gmane rewrites Received headers, which increases spamminess
+       # Some older archives set Original-To
+       foreach my $x (qw(Received To)) {
+               my @h = $hdr->header_raw("Original-$x");
+               if (@h) {
+                       $hdr->header_set($x, @h);
+                       $hdr->header_set("Original-$x");
+               }
+       }
+
+       # Approved triggers for the SA HEADER_SPAM rule,
+       # X-From is gmane specific
+       foreach my $drop (qw(Approved X-From)) {
+               $hdr->header_set($drop);
+       }
+
+       # appears to be an old gmane bug:
+       $hdr->header_set('connect()');
+
+       $self->ACCEPT($mime);
+}
+
+sub delivery {
+       my ($self, $mime) = @_;
+       $self->scrub($mime);
+}
+
+1;