# --
# Kernel/System/PostMaster/LoopProtection/FS.pm - backend module of LoopProtection
# Copyright (C) 2001-2007 OTRS GmbH, http://otrs.org/
# --
# $Id: FS.pm,v 1.7 2007/03/19 22:24:59 martin Exp $
# --
# This software comes with ABSOLUTELY NO WARRANTY. For details, see
# the enclosed file COPYING for license information (GPL). If you
# did not receive this file, see http://www.gnu.org/licenses/gpl.txt.
# --

package Kernel::System::PostMaster::LoopProtection::FS;

use strict;

use vars qw($VERSION);
$VERSION = '$Revision: 1.7 $';
$VERSION =~ s/^\$.*:\W(.*)\W.+?$/$1/;

sub new {
    my $Type = shift;
    my %Param = @_;

    # allocate new hash for object
    my $Self = {};
    bless ($Self, $Type);

    # get needed  objects
    foreach (qw(DBObject LogObject ConfigObject)) {
        $Self->{$_} = $Param{$_} || die "Got no $_!";
    }
    # get config options
    $Self->{LoopProtectionLog} = $Self->{ConfigObject}->Get('LoopProtectionLog')
        || die 'No Config option "LoopProtectionLog"!';

    $Self->{PostmasterMaxEmails} = $Self->{ConfigObject}->Get('PostmasterMaxEmails') || 40;
    # create logfile name
    my ($Sec, $Min, $Hour, $Day, $Month, $Year) = localtime(time);
    $Year=$Year+1900;
    $Month++;
    $Self->{LoopProtectionLog} .= '-'.$Year.'-'.$Month.'-'.$Day.'.log';

    return $Self;
}

sub SendEmail {
    my $Self = shift;
    my %Param = @_;
    my $To = $Param{To} || return;

    # write log
    if (open (DATA, ">> $Self->{LoopProtectionLog}")) {
        print DATA "$To;".localtime().";\n";
        close (DATA);
    }
    else {
        $Self->{LogObject}->Log(
            Priority => 'error',
            Message => "LoopProtection! Can't write '$Self->{LoopProtectionLog}': $!!",
        );
    }

    return 1;
}

sub Check {
    my $Self = shift;
    my %Param = @_;
    my $To = $Param{To} || return;
    my $Count = 0;

    # check existing logfile
    if (!open (DATA, "< $Self->{LoopProtectionLog}")) {
        # create new log file
        if (!open (DATA, "> $Self->{LoopProtectionLog}")) {
            $Self->{LogObject}->Log(
                Priority => 'error',
                Message => "LoopProtection! Can't write '$Self->{LoopProtectionLog}': $!!",
            );
        }
        else {
            close (DATA);
        }
    }
    else {
        # open old log file
        while (<DATA>) {
            my @Data = split(/;/, $_);
            if ($Data[0] eq $To) {
                $Count++;
            }
        }
        close (DATA);
    }

    # check possible loop
    if ($Count >= $Self->{PostmasterMaxEmails}) {
        $Self->{LogObject}->Log(
            Priority => 'notice',
            Message => "LoopProtection!!! Send no more emails to '$To'! Max. count of $Self->{PostmasterMaxEmails} has been reached!",
        );
        return;
    }
    else {
        return 1;
    }
}

1;