Config.pm: Add support for mailing list information

The world has turned since I first started following mailing lists and
to my surprise every mailing list that I am subscribed to properly
sets the "List-ID:" mailing list header.  So instead of doing
something clever and flexible I am adding support for looking up
public inbox mailing lists by their mailing list name.

That makes the work needed for each email trivial and easy to understand.
- Parse the "List-ID:" header.
- Lookup in the configuration which mailbox is connected to that
  "List-ID:"
- Deliver the mail to that mailbox.

To that end this change enhances PublicInbox to have an additional
mailbox configuration parameter "listid" that holds the mailing list
name.

A method is added to the PublicInbox config object called
lookup_list_id that given a mailing list name will return the
PublicInbox in the configuration that is configured to handle that
mailing list.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
[ew: avoid autovivification of $ibx->{listid} for t/config.t]

diff --git a/lib/PublicInbox/Config.pm b/lib/PublicInbox/Config.pm
index 4fcb20d24437dee77aeb1bdf6e1ecc6f92c9466d..c2fa40f970d6575306e02c93cdf0f148ffdcc89b 100644 (file)
--- a/lib/PublicInbox/Config.pm
+++ b/lib/PublicInbox/Config.pm
@@ -25,6 +25,7 @@ sub new {
 
        # caches
        $self->{-by_addr} ||= {};
+       $self->{-by_list_id} ||= {};
        $self->{-by_name} ||= {};
        $self->{-by_newsgroup} ||= {};
        $self->{-no_obfuscate} ||= {};
@@ -84,6 +85,33 @@ sub lookup {
        _fill($self, $pfx);
 }
 
+sub lookup_list_id {
+       my ($self, $list_id) = @_;
+       $list_id = lc($list_id);
+       my $ibx = $self->{-by_list_id}->{$list_id};
+       return $ibx if $ibx;
+
+       my $pfx;
+
+       foreach my $k (keys %$self) {
+               $k =~ /\A(publicinbox\.[\w-]+)\.listid\z/ or next;
+               my $v = $self->{$k};
+               if (ref($v) eq "ARRAY") {
+                       foreach my $alias (@$v) {
+                               (lc($alias) eq $list_id) or next;
+                               $pfx = $1;
+                               last;
+                       }
+               } else {
+                       (lc($v) eq $list_id) or next;
+                       $pfx = $1;
+                       last;
+               }
+       }
+       defined $pfx or return;
+       _fill($self, $pfx);
+}
+
 sub lookup_name ($$) {
        my ($self, $name) = @_;
        $self->{-by_name}->{$name} || _fill($self, "publicinbox.$name");
@@ -398,7 +426,7 @@ sub _fill {
        }
        # TODO: more arrays, we should support multi-value for
        # more things to encourage decentralization
-       foreach my $k (qw(address altid nntpmirror coderepo hide)) {
+       foreach my $k (qw(address altid nntpmirror coderepo hide listid)) {
                if (defined(my $v = $self->{"$pfx.$k"})) {
                        $ibx->{$k} = _array($v);
                }
@@ -421,6 +449,11 @@ sub _fill {
                $self->{-by_addr}->{$lc_addr} = $ibx;
                $self->{-no_obfuscate}->{$lc_addr} = 1;
        }
+       if (my $listids = $ibx->{listid}) {
+               foreach my $list_id (@$listids) {
+                       $self->{-by_list_id}->{$list_id} = $ibx;
+               }
+       }
        if (my $ng = $ibx->{newsgroup}) {
                $self->{-by_newsgroup}->{$ng} = $ibx;
        }