split out spamcheck/spamc to its own module.

[public-inbox.git] / lib / PublicInbox / Spamcheck / Spamc.pm

diff --git a/lib/PublicInbox/Spamcheck/Spamc.pm b/lib/PublicInbox/Spamcheck/Spamc.pm
new file mode 100644 (file)
index 0000000..312e52d
--- /dev/null
+++ b/lib/PublicInbox/Spamcheck/Spamc.pm
@@ -0,0 +1,94 @@
+# Copyright (C) 2016 all contributors <meta@public-inbox.org>
+# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>
+package PublicInbox::Spamcheck::Spamc;
+use strict;
+use warnings;
+use PublicInbox::Spawn qw(popen_rd spawn);
+use IO::File;
+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;
+       }
+       do {
+               $r = sysread($fh, $$out, 65536, length($$out));
+       } while (defined($r) && $r != 0);
+       defined $r or 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 $tmpfh;
+       my $fd;
+       if (my $ref = ref($msg)) {
+
+               return $msg->fileno if $ref ne 'SCALAR' && $msg->can('fileno');
+
+               $tmpfh = IO::File->new_tmpfile;
+               $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;