BarcodeChecksum.php

<?php
/**
 * @link      http://astwell.com/
 * @copyright Copyright (c) 2014 Astwell Soft
 * @license   http://astwell.com/license/
 */

namespace lembadm\barcode;

use Yii;
use yii\validators\Validator;

/**
 * Class BarcodeChecksum
 *
 * @package lembadm\barcode
 */
class BarcodeChecksum extends Validator
{
    /**
     * @var string Checksum generator name
     */
    public $method;

    /**
     * @inheritdoc
     */
    public function init()
    {
        $this->message = $this->message
            ?: Yii::t( 'yii', '{attribute} checksum not valid' );
    }

    /**
     * @inheritdoc
     */
    public function validateValue( $value )
    {
        if( ! $this->method ) return null;

        return ( $this->{'compute' . $this->method}( $value ) )
            ? [$this->message, []]
            : null;
    }

    /**
     * @inheritdoc
     */
    public function clientValidateAttribute($model, $attribute, $view)
    {
        BarcodeAsset::register($view);

        return null;
    }

    /**
     * EAN13 checksum generator
     *
     * @param string $value
     *
     * @return bool
     */
    protected function computeEAN( $value )
    {
        $sum = 0;
        $odd = true;

        for ($i = (strlen($value) - 2); $i > -1; $i--) {
            $sum += ( $odd ? 3 : 1 ) * $value[$i];
            $odd = ! $odd;
        }

        return substr( $value, -1 ) != (( 10 - $sum % 10 ) % 10);
    }

    /**
     * Code39 checksum generator
     *
     * @param string $value
     *
     * @return bool
     */
    protected function computeCode39($value)
    {
        $check = [
            '0' =>  0, '1' =>  1, '2' =>  2, '3' =>  3, '4' =>  4, '5' =>  5, '6' =>  6,
            '7' =>  7, '8' =>  8, '9' =>  9, 'A' => 10, 'B' => 11, 'C' => 12, 'D' => 13,
            'E' => 14, 'F' => 15, 'G' => 16, 'H' => 17, 'I' => 18, 'J' => 19, 'K' => 20,
            'L' => 21, 'M' => 22, 'N' => 23, 'O' => 24, 'P' => 25, 'Q' => 26, 'R' => 27,
            'S' => 28, 'T' => 29, 'U' => 30, 'V' => 31, 'W' => 32, 'X' => 33, 'Y' => 34,
            'Z' => 35, '-' => 36, '.' => 37, ' ' => 38, '$' => 39, '/' => 40, '+' => 41,
            '%' => 42,
        ];
        $checksum = substr( $value, - 1, 1 );
        $value = str_split( substr( $value, 0, - 1 ) );
        $count = 0;

        foreach ($value as $char) {
            $count += $check[$char];
        }

        return ( ( $count % 43 ) == $check[$checksum] );
    }
}