# Copyright (C) 2016-2021 all contributors
# License: AGPL-3.0+
# Default spam filter class for wrapping spamc(1)
package PublicInbox::Spamcheck::Spamc;
use strict;
use warnings;
use PublicInbox::Spawn qw(popen_rd spawn);
use IO::Handle;
use Fcntl qw(SEEK_SET);
sub new {
my ($class) = @_;
bless {
checkcmd => [qw(spamc -E --headers)],
hamcmd => [qw(spamc -L ham)],
spamcmd => [qw(spamc -L spam)],
}, $class;
}
sub spamcheck {
my ($self, $msg, $out) = @_;
my $rdr = { 0 => _msg_to_fh($self, $msg) };
my ($fh, $pid) = popen_rd($self->{checkcmd}, undef, $rdr);
unless (ref $out) {
my $buf = '';
$out = \$buf;
}
$$out = do { local $/; <$fh> };
close $fh or die "close failed: $!";
waitpid($pid, 0);
($? || $$out eq '') ? 0 : 1;
}
sub hamlearn {
my ($self, $msg, $rdr) = @_;
_learn($self, $msg, $rdr, 'hamcmd');
}
sub spamlearn {
my ($self, $msg, $rdr) = @_;
_learn($self, $msg, $rdr, 'spamcmd');
}
sub _learn {
my ($self, $msg, $rdr, $field) = @_;
$rdr ||= {};
$rdr->{0} = _msg_to_fh($self, $msg);
$rdr->{1} ||= $self->_devnull;
$rdr->{2} ||= $self->_devnull;
my $pid = spawn($self->{$field}, undef, $rdr);
waitpid($pid, 0);
!$?;
}
sub _devnull {
my ($self) = @_;
$self->{-devnull} //= do {
open my $fh, '+>', '/dev/null' or
die "failed to open /dev/null: $!";
$fh
}
}
sub _msg_to_fh {
my ($self, $msg) = @_;
if (my $ref = ref($msg)) {
my $fd = eval { fileno($msg) };
return $msg if defined($fd) && $fd >= 0;
open(my $tmpfh, '+>', undef) or die "failed to open: $!";
$tmpfh->autoflush(1);
$msg = \($msg->as_string) if $ref ne 'SCALAR';
print $tmpfh $$msg or die "failed to print: $!";
sysseek($tmpfh, 0, SEEK_SET) or
die "sysseek(fh) failed: $!";
return $tmpfh;
}
$msg;
}
1;