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package SL::Helper::QrBillFunctions;

use List::Util qw(first);

use strict;
use warnings;

use Exporter qw(import);
our @EXPORT_OK = qw(get_qrbill_account assemble_ref_number get_ref_number_formatted
get_iban_formatted get_amount_formatted);

sub get_qrbill_account {
$main::lxdebug->enter_sub();

my $qr_account;

my $bank_accounts = SL::DB::Manager::BankAccount->get_all_sorted;
$qr_account = first { $_->use_for_qrbill } @{ $bank_accounts };

if (!$qr_account) {
return undef, $::locale->text('No bank account flagged for QRBill usage was found.');
}

$main::lxdebug->leave_sub();
return $qr_account, undef;
}

sub assemble_ref_number {
$main::lxdebug->enter_sub();

my $bank_id = $_[0];
my $customer_number = $_[1];
my $order_number = $_[2] // "0";
my $invoice_number = $_[3] // "0";

# check values (analog to checks in makro)
# - bank_id
# input: 6 digits, only numbers
# output: 6 digits, only numbers
if (!($bank_id =~ /^\d*$/) || length($bank_id) != 6) {
return undef, $::locale->text('Bank account id number invalid. Must be 6 digits.');
}

# - customer_number
# input: prefix (letters) + up to 6 digits (numbers)
# output: prefix removed, 6 digits, filled with leading zeros
$customer_number = remove_letters_prefix($customer_number);
if (!check_digits_and_max_length($customer_number, 6)) {
return undef, $::locale->text('Customer number invalid. Must be less then or equal to 6 digits after non-digits removed.');
}
# fill with zeros
$customer_number = sprintf "%06d", $customer_number;

# - order_number
# input: prefix (letters) + up to 7 digits, may be zero
# output: prefix removed, 7 digits, filled with leading zeros
$order_number = remove_letters_prefix($order_number);
if (!check_digits_and_max_length($order_number, 7)) {
return undef, $::locale->text('Order number invalid. Must be less then or equal to 7 digits after prefix.');
}
# fill with zeros
$order_number = sprintf "%07d", $order_number;

# - invoice_number
# input: prefix (letters) + up to 7 digits, may be zero
# output: prefix removed, 7 digits, filled with leading zeros
$invoice_number = remove_letters_prefix($invoice_number);
if (!check_digits_and_max_length($invoice_number, 7)) {
return undef, $::locale->text('Invoice number invalid. Must be less then or equal to 7 digits after prefix.');
}
# fill with zeros
$invoice_number = sprintf "%07d", $invoice_number;

# assemble ref. number
my $ref_number = $bank_id . $customer_number . $order_number . $invoice_number;

# calculate check digit
my $ref_number_cpl = $ref_number . calculate_check_digit($ref_number);

$main::lxdebug->leave_sub();
return $ref_number_cpl, undef;
}

sub get_ref_number_formatted {
$main::lxdebug->enter_sub();

my $ref_number = $_[0];

# create ref. number in format:
# 'XX XXXXX XXXXX XXXXX XXXXX XXXXX' (2 digits + 5 x 5 digits)
my $ref_number_spaced = substr($ref_number, 0, 2) . ' ' .
substr($ref_number, 2, 5) . ' ' .
substr($ref_number, 7, 5) . ' ' .
substr($ref_number, 12, 5) . ' ' .
substr($ref_number, 17, 5) . ' ' .
substr($ref_number, 22, 5);

$main::lxdebug->leave_sub();
return $ref_number_spaced;
}

sub get_iban_formatted {
$main::lxdebug->enter_sub();

my $iban = $_[0];

# create iban number in format:
# 'XXXX XXXX XXXX XXXX XXXX X' (5 x 4 + 1digits)
my $iban_spaced = substr($iban, 0, 4) . ' ' .
substr($iban, 4, 4) . ' ' .
substr($iban, 8, 4) . ' ' .
substr($iban, 12, 4) . ' ' .
substr($iban, 16, 4) . ' ' .
substr($iban, 20, 1);

$main::lxdebug->leave_sub();
return $iban_spaced;
}

sub get_amount_formatted {
$main::lxdebug->enter_sub();

unless ($_[0] =~ /^\d+\.\d{2}$/) {
return undef;
}

local $_ = shift;
$_ = reverse split //;
m/^\d{2}\./g;
s/\G(\d{3})(?=\d)/$1 /g;

$main::lxdebug->leave_sub();
return scalar reverse split //;
}

### internal functions

sub remove_letters_prefix {
my $s = $_[0];
$s =~ s/^[a-zA-Z]+//;
return $s;
}

sub check_digits_and_max_length {
my $s = $_[0];
my $length = $_[1];

return 0 if (!($s =~ /^\d*$/) || length($s) > $length);
return 1;
}

sub calculate_check_digit {
# calculate ESR check digit using algorithm: "modulo 10, recursive"
my $ref_number_str = $_[0];

my @m = (0, 9, 4, 6, 8, 2, 7, 1, 3, 5);
my $carry = 0;

my @ref_number_split = map int($_), split(//, $ref_number_str);

for my $v (@ref_number_split) {
$carry = @m[($carry + $v) % 10];
}

return (10 - $carry) % 10;
}

1;

__END__

=encoding utf-8

=head1 NAME

SL::Helper::QrBillFunctions - Additional helper functions for the swiss QR bill

=head1 SYNOPSIS

use SL::Helper::QrBillFunctions qw(get_qrbill_account assemble_ref_number
get_ref_number_formatted get_iban_formatted get_amount_formatted);

# get qr-account data
my ($qr_account, $error) = get_qrbill_account();

my ($ref_number, $error) = assemble_ref_number(
$qr_account->{'bank_account_id'},
$form->{'customernumber'},
$form->{'ordnumber'},
$form->{'invnumber'},
);

# get ref. number/iban formatted with spaces and set into form for template
# processing
$form->{'ref_number_formatted'} = get_ref_number_formatted($ref_number);
$form->{'iban_formatted'} = get_iban_formatted($qr_account->{'iban'});

# format amount for template
my $amount = sprintf("%.2f", $form->parse_amount(\%::myconfig, $form->{'total'}));
my $amount_formatted = get_amount_formatted($amount);

=head1 DESCRIPTION

Helper functions moved from SL::Template::OpenDocument.

=head1 FUNCTIONS

=over 4

=item C<get_qrbill_account>

Return the bank account flagged for the QR bill. And a string containing an
error message as second return value or undef if no error occurred.

=item C<assemble_ref_number>

Assembles and returns the Swiss reference number. 27 digits, formed
from the parameters plus one check digit. And a string containing an error
message as second return value or undef if no error occurred.

Prefixes will be removed and numbers filled up with leading zeros.

Parameters:

=over 4

=item C<bank_id>

"Bankkonto Identifikationsnummer". 6 digit number.

=item C<customer_number>

Kivitendo customer number. Prefix (letters) and up to 6 digits.

=item C<order_number>

Kivitendo order number. Prefix (letters) and up to 7 digits, may be zero.

=item C<invoice_number>

Kivitendo invoice number. Prefix (letters) and up to 7 digits, may be zero.

=back

=item C<get_ref_number_formatted>

Given a reference number, return it in format:

'XX XXXXX XXXXX XXXXX XXXXX XXXXX' (2 digits + 5 x 5 digits)

=item C<get_iban_formatted>

Given a IBAN number, return it in format:

'XXXX XXXX XXXX XXXX XXXX X' (5 x 4 + 1digits)

=item C<get_amount_formatted>

Given an amount, return it in format: 'X XXX.XX'
Or undef if an error occurred.

=back

=head1 ERROR HANDLING

The functions C<get_qrbill_account> and C<assemble_ref_number> return
undef when an error occurs and a string containing an error message as
second return value.

The function C<get_amount_formatted> returns undef if an error occurred.

The other functions always return a result.

=head1 AUTHOR

Cem Aydin E<lt>cem.aydin@gmx.chE<gt>

=cut
(15-15/18)