mda: hoist out List-ID handling and reuse in -learn

It's now possible to inject false-positive ham into an inbox
the same way -mda does via List-ID.

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/PublicInbox/MDA.pm b/lib/PublicInbox/MDA.pm
index 9cafda13..ce2c870f 100644
--- a/lib/PublicInbox/MDA.pm
+++ b/lib/PublicInbox/MDA.pm
@@ -83,4 +83,19 @@ sub set_list_headers {
         }
 }
 
+# TODO: deal with multiple List-ID headers?
+sub inbox_for_list_id ($$) {
+        my ($klass, $config, $simple) = @_;
+
+        # newer Email::Simple allows header_raw, as does Email::MIME:
+        my $list_id = $simple->can('header_raw') ?
+                        $simple->header_raw('List-Id') :
+                        $simple->header('List-Id');
+        my $ibx;
+        if (defined $list_id && $list_id =~ /<[ \t]*(.+)?[ \t]*>/) {
+                $ibx = $config->lookup_list_id($1);
+        }
+        $ibx;
+}
+
 1;