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package SpamCat;
use Carp;
use Data::Dumper;
use DBI;
use Email::Simple;
use IO::File;
use strict;
use warnings;
our $VERSION = '0';
my $log = sub {
print STDERR "DEBUG: " . join(', ', @_) . "\n";
};
sub new {
my($class, %conf) = @_;
my $dbh = DBI->connect("dbi:SQLite:dbname=$conf{dbpath}", '', '');
$conf{dbh} = $dbh;
bless \%conf, $class;
}
sub deliver {
my ($self) = @_;
local $/;
my $email = Email::Simple->new(<>);
my $email_to = $email->header('To');
my @to_addrs = $self->parse_to(split /,\s*/, $email_to);
my $count;
foreach my $to_addr (@to_addrs) {
foreach my $domain (@{$self->{domains}}) {
if ($to_addr =~ /(.*)\@$domain/) {
my $sender = $1;
my $c = $self->decrement_count($sender);
if (!defined $count || $c > $count) {
$count = $c;
}
}
}
}
if (defined $count) {
return if $count == 0;
my $count_str = '[' . $count . '/' . $self->{default_count} . ']';
my $new_subject = $email->header('Subject');
if ($new_subject) {
$new_subject .= ' - ' . $count_str;
} else {
$new_subject = $count_str;
}
$email->header_set('Subject' => $new_subject);
}
my $deliverfh = IO::File->new("| " . $self->{deliver}) ||
die "Couldn't open pipe to " . $self->{deliver} . ": $!\n";
print $deliverfh $email->as_string;
$deliverfh->close;
}
sub parse_to {
my ($self, @tovals) = @_;
map {
if ($_ =~ /<(.*)>/) {
$1;
} else {
$_;
}
} @tovals;
}
sub get_count {
my ($self, $sender) = @_;
$self->in_transaction(sub { $self->get_count_t($sender) });
}
sub set_count {
my ($self, $sender, $count) = @_;
$self->in_transaction(sub { $self->set_count_t($sender, $count); });
}
sub decrement_count {
my ($self, $sender) = @_;
$self->in_transaction(sub { $self->decrement_count_t($sender); });
}
#
# The _t functions are meant to be run inside transacitons.
#
sub get_count_t {
my ($self, $sender) = @_;
my $q = 'SELECT count FROM emails WHERE sender=?';
my $sth = $self->{dbh}->prepare($q);
$sth->execute($sender);
my @row = $sth->fetchrow_array;
$sth->finish;
$row[0];
}
sub set_count_t {
my ($self, $sender, $count) = @_;
my $q;
if (!defined $self->get_count_t($sender)) {
# Insert when there's no count.
$q = 'INSERT INTO emails (count, sender) VALUES (?, ?)';
} else {
# Otherwise update the record with the new count.
$q = 'UPDATE emails SET count = ? modified = CURRENT_TIMESTAMP WHERE sender = ?'
}
my $sth = $self->{dbh}->prepare($q);
$sth->execute($count, $sender);
$sth->finish;
$count;
}
sub decrement_count_t {
my ($self, $sender) = @_;
my $q;
my $count = $self->get_count_t($sender);
if (!defined $count) {
$count = $self->{default_count};
$q = 'INSERT INTO emails (count, sender) VALUES (?, ?)';
} else {
$count = $count <= 0 ? '0' : $count - 1;
$q = "UPDATE emails SET count = ?, modified = CURRENT_TIMESTAMP WHERE sender = ?";
}
my $sth = $self->{dbh}->prepare($q);
$sth->execute($count, $sender);
$sth->finish;
$count;
}
sub in_transaction {
my ($self, $sub) = @_;
$self->{dbh}->begin_work;
my $rc = eval { &$sub($self); };
if ($@) {
$self->{dbh}->rollback;
warn "ERROR: Transaction failed: $@\n";
exit 1;
} else {
$self->{dbh}->commit;
}
$rc;
}
1;
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