Base-62 Ticket numbers

26 Oct 2004

      Hello

Frederik Seiffert's modification to the Random.pm module gave me the idea
of using base-62 as ticket numbers (chars 0-9, a-z, A-Z) - nice and short,
so your subject line is a little less cluttered.

For those who find it useful, please find the code attached below.

Regards
Henry Combrinck

Installation procedure:

0.  Install the Math::BaseCalc perl module:

    perl -MCPAN -e shell
    install Math::BaseCalc

1.  Copy/paste code to filename 'RandomBase62.pm'.
2.  Copy file RandomBase62.pm to
~/Kernel/System/Ticket/Number/RandomBase62.pm
3.  Edit your ~/Kernel/Config.pm to show:

#------------------------------------
# $Self->{TicketNumberGenerator} =.... (comment the existing line out)
$Self->{TicketNumberGenerator} =
'Kernel::System::Ticket::Number::RandomBase62';
#------------------------------------

# --
# Ticket/Number/RandomBase62.pm - a random Base-62 ticket number generator
# Copyright (C) 2004 Henry Combrinck <[EMAIL PROTECTED]>
# Based on Martin Edenhofer's Random.pm code.
# --
# $Id: $
# --
# 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.
# --
# Note:
# available objects are: ConfigObject, LogObject and DBObject
#
# Generates random Base-62 ticket numbers (eg 1gWdgXQ, ...)
#
# Requires perl module:
# - Math::BaseCalc
#
# --

package Kernel::System::Ticket::Number::RandomBase62;

use strict;
use Math::BaseCalc;

use vars qw($VERSION);
$VERSION = '$Revision: 1.0 $';
$VERSION =~ s/^\$.*:\W(.*)\W.+?$/$1/;

sub CreateTicketNr {
    my $Self = shift;
    my $b62 = new Math::BaseCalc(digits=>[0..9,'a'..'z','A'..'Z']);
    # get needed config options
    my $SystemID = $Self->{ConfigObject}->Get('SystemID');
    # random counter
    my $Count = int(rand(0xFFFFFFFF));
    # convert to base-62
    $Count = $b62->to_base($Count);
    # create new ticket number
    my $Tn = $SystemID.$Count;
    # Check ticket number. If exists generate new one!
    if ($Self->CheckTicketNr(Tn=>$Tn)) {
        $Self->{LoopProtectionCounter}++;
        if ($Self->{LoopProtectionCounter} >= 1000) {
          # loop protection
          $Self->{LogObject}->Log(
            Priority => 'error',
            Message => "CounterLoopProtection is now
$Self->{LoopProtectionCounter}!".
                   " Stopped CreateTicketNr()!",
          );
          return;
        }
        # create new ticket number again
        $Self->{LogObject}->Log(
          Priority => 'notice',
          Message => "Tn ($Tn) exists! Creating new one.",
        );
        $Tn = $Self->CreateTicketNr();
    }
    return $Tn;
}
# --
sub GetTNByString {
    my $Self = shift;
    my $String = shift || return;
    # get needed config options
    my $SystemID = $Self->{ConfigObject}->Get('SystemID');
    my $TicketHook = $Self->{ConfigObject}->Get('TicketHook');
    # check ticket number
    if ($String =~ /$TicketHook:+.{0,1}($SystemID[0-9a-fA-F]{8,40})-FW/i) {
        return $1;
    }
    else {
        if ($String =~ /$TicketHook:+.{0,1}($SystemID[0-9a-fA-F]{8,40})/i) {
            return $1;
        }
        else {
            return;
        }
    }
}
# --
1;

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Henry Combrinck

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