# Copyright (C) 2016-2021 all contributors
# License: AGPL-3.0+
#
# Plack app redirector for mapping /$NEWSGROUP requests to
# the appropriate /$INBOX in PublicInbox::WWW because some
# auto-linkifiers cannot handle nntp:// redirects properly.
# This is also used directly by PublicInbox::WWW
package PublicInbox::NewsWWW;
use strict;
use warnings;
use PublicInbox::Config;
use PublicInbox::MID qw(mid_escape);
use PublicInbox::Hval qw(prurl);
sub new {
my ($class, $pi_cfg) = @_;
bless { pi_cfg => $pi_cfg // PublicInbox::Config->new }, $class;
}
sub redirect ($$) {
my ($code, $url) = @_;
[ $code,
[ Location => $url, 'Content-Type' => 'text/plain' ],
[ "Redirecting to $url\n" ] ]
}
sub try_inbox {
my ($ibx, $arg) = @_;
return if scalar(@$arg) > 1;
# do not pass $env since HTTP_HOST may differ
my $url = $ibx->base_url or return;
my ($mid) = @$arg;
eval { $ibx->mm->num_for($mid) } or return;
# 302 since the same message may show up on
# multiple inboxes and inboxes can be added/reordered
$arg->[1] = redirect(302, $url .= mid_escape($mid) . '/');
}
sub call {
my ($self, $env) = @_;
# some links may have the article number in them:
# /inbox.foo.bar/123456
my (undef, @parts) = split(m!/!, $env->{PATH_INFO});
@parts or return
[ 404, [qw(Content-Type text/plain)], ["404 Not Found\n"] ];
my ($ng, $article) = @parts;
my $pi_cfg = $self->{pi_cfg};
if (my $ibx = $pi_cfg->lookup_newsgroup($ng)) {
my $url = prurl($env, $ibx->{url});
my $code = 301;
if (defined $article && $article =~ /\A[0-9]+\z/) {
my $mid = eval { $ibx->mm->mid_for($article) };
if (defined $mid) {
# article IDs are not stable across clones,
# do not encourage caching/bookmarking them
$code = 302;
$url .= mid_escape($mid) . '/';
}
}
return redirect($code, $url);
}
my @try = (join('/', @parts));
# trailing slash is in the rest of our WWW, so maybe some users
# will assume it:
if ($parts[-1] eq '') {
pop @parts;
push @try, join('/', @parts);
}
my $ALL = $pi_cfg->ALL;
if (my $over = $ALL ? $ALL->over : undef) {
my $by_eidx_key = $pi_cfg->{-by_eidx_key};
for my $mid (@try) {
my ($id, $prev);
while (my $x = $over->next_by_mid($mid, \$id, \$prev)) {
my $xr3 = $over->get_xref3($x->{num});
for (@$xr3) {
s/:[0-9]+:$x->{blob}\z// or next;
my $ibx = $by_eidx_key->{$_} // next;
my $url = $ALL->base_url($env) //
$ibx->base_url // next;
$url .= mid_escape($mid) . '/';
return redirect(302, $url);
}
}
}
} else { # slow path, scan every inbox
for my $mid (@try) {
my $arg = [ $mid ]; # [1] => result
$pi_cfg->each_inbox(\&try_inbox, $arg);
return $arg->[1] if $arg->[1];
}
}
[ 404, [qw(Content-Type text/plain)], ["404 Not Found\n"] ];
}
1;