# Copyright (C) 2016-2018 all contributors
# License: AGPL-3.0+
package PublicInbox::Spamcheck::Spamc;
use strict;
use warnings;
use PublicInbox::Spawn qw(popen_rd spawn);
use IO::Handle;
use Fcntl qw(:DEFAULT 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 $tmp;
my $fd = _msg_to_fd($self, $msg, \$tmp);
my $rdr = { 0 => $fd };
my ($fh, $pid) = popen_rd($self->{checkcmd}, undef, $rdr);
defined $pid or die "failed to popen_rd spamc: $!\n";
my $r;
unless (ref $out) {
my $buf = '';
$out = \$buf;
}
again:
do {
$r = sysread($fh, $$out, 65536, length($$out));
} while (defined($r) && $r != 0);
unless (defined $r) {
goto again if $!{EINTR};
die "read failed: $!";
}
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->{1} ||= $self->_devnull;
$rdr->{2} ||= $self->_devnull;
my $tmp;
$rdr->{0} = _msg_to_fd($self, $msg, \$tmp);
my $pid = spawn($self->{$field}, undef, $rdr);
waitpid($pid, 0);
!$?;
}
sub _devnull {
my ($self) = @_;
my $fd = $self->{-devnullfd};
return $fd if defined $fd;
open my $fh, '+>', '/dev/null' or
die "failed to open /dev/null: $!";
$self->{-devnull} = $fh;
$self->{-devnullfd} = fileno($fh);
}
sub _msg_to_fd {
my ($self, $msg, $tmpref) = @_;
my $fd;
if (my $ref = ref($msg)) {
my $fileno = eval { fileno($msg) };
return $fileno if defined $fileno;
open(my $tmpfh, '+>', undef) or die "failed to open: $!";
$tmpfh->autoflush(1);
$msg = \($msg->as_string) if $ref ne 'SCALAR';
print $tmpfh $$msg or die "failed to print: $!";
sysseek($tmpfh, 0, SEEK_SET) or
die "sysseek(fh) failed: $!";
$$tmpref = $tmpfh;
return fileno($tmpfh);
}
$msg;
}
1;