93 lines
2.3 KiB
Perl
93 lines
2.3 KiB
Perl
# --
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# Copyright (C) 2001-2019 OTRS AG, https://otrs.com/
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# --
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# This software comes with ABSOLUTELY NO WARRANTY. For details, see
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# the enclosed file COPYING for license information (GPL). If you
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# did not receive this file, see https://www.gnu.org/licenses/gpl-3.0.txt.
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# --
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#
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# The algorithm to calculate the checksum is derived from the one
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# Deutsche Bundesbahn (german railway company) uses for calculation
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# of the check digit of their vehikel numbering.
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# The checksum is calculated by alternately multiplying the digits
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# with 1 and 2 and adding the resulsts from left to right of the
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# vehikel number. The modulus to 10 of this sum is substracted from
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# 10. See: http://www.pruefziffernberechnung.de/F/Fahrzeugnummer.shtml
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# (german)
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#
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# Generates change numbers like yyyymmddssID#####C (e. g. 2002062310100011)
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package Kernel::System::ITSMChange::Number::DateChecksum;
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use strict;
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use warnings;
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use parent qw(Kernel::System::ITSMChange::NumberBase);
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our @ObjectDependencies = (
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'Kernel::Config',
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);
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sub IsDateBased {
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return 1;
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}
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sub ChangeNumberBuild {
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my ( $Self, $Offset ) = @_;
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$Offset ||= 0;
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my $Counter = $Self->ChangeNumberCounterAdd(
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Offset => 1 + $Offset,
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);
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return if !$Counter;
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my $ConfigObject = $Kernel::OM->Get('Kernel::Config');
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my $SystemID = $ConfigObject->Get('SystemID');
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# Pad ticket number with leading '0' to length 5.
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$Counter = sprintf "%.5u", $Counter;
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my $DateTimeObject = $Kernel::OM->Create(
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'Kernel::System::DateTime'
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);
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my $DateTimeSettings = $DateTimeObject->Get();
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# Create new ticket number.
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my $ChangeNumber = $DateTimeSettings->{Year}
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. sprintf( "%.2u", $DateTimeSettings->{Month} )
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. sprintf( "%.2u", $DateTimeSettings->{Day} )
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. $SystemID . $Counter;
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# Calculate a checksum.
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my $CheckSum = 0;
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my $Multiply = 1;
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for ( my $i = 0; $i < length($ChangeNumber); ++$i ) {
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my $Digit = substr( $ChangeNumber, $i, 1 );
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$CheckSum = $CheckSum + ( $Multiply * $Digit );
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$Multiply += 1;
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if ( $Multiply == 3 ) {
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$Multiply = 1;
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}
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}
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$CheckSum %= 10;
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$CheckSum = 10 - $CheckSum;
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if ( $CheckSum == 10 ) {
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$CheckSum = 1;
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}
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$ChangeNumber .= $CheckSum;
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return $ChangeNumber;
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}
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1;
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