qrrender.php

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<?php
/*
 You may not change or alter any portion of this comment or credits
 of supporting developers from this source code or any supporting source code
 which is considered copyrighted (c) material of the original comment or credit authors.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 */

use Xoops\Core\Request;

// this is located in include, otherwise normal/anon users do not have authority to run
include dirname(dirname(dirname(__DIR__))) . '/mainfile.php';

$xoops = Xoops::getinstance();
$xoops->logger()->quiet();

$text = Request::getString('text', 'error');

$configs = $xoops->getModuleConfigs('qrcode');

$qrCode = new Endroid\QrCode\QrCode($text);

$ecChar = $configs['qrcode_ecl'];
switch (strtoupper($ecChar)) {
    case 'H':
        $ec = Endroid\QrCode\QrCode::LEVEL_HIGH;
        break;
    case 'Q':
        $ec = Endroid\QrCode\QrCode::LEVEL_QUARTILE;
        break;
    case 'M':
        $ec = Endroid\QrCode\QrCode::LEVEL_MEDIUM;
        break;
    case 'L':
    default:
        $ec = Endroid\QrCode\QrCode::LEVEL_LOW;
        break;
}
$qrCode->setErrorCorrection($ec);
$qrCode->setModuleSize(intval($configs['qrcode_mps'])-1);
$qrCode->setPadding($configs['qrcode_margin']*$qrCode->getModuleSize());
$qrCode->setBackgroundColor(normalizeColor($configs['qrcode_bgcolor']));
$qrCode->setForegroundColor(normalizeColor($configs['qrcode_fgcolor']));

//$qrCode->setText("Life is too short to be generating QR codes");
//$qrCode->setSize(300);

try {
    $qrData = $qrCode->get('png');
} catch (\Exception $e) {
    $xoopsPreload->triggerEvent('core.exception', $e);
    $qrData = '';
}

$mimetype = \Xoops\Core\MimeTypes::findType('png');
$expires = 60*60*24*15; // seconds, minutes, hours, days
header("Cache-Control: public, max-age=" . $expires);
header('Expires: ' . gmdate('D, d M Y H:i:s', time() + $expires) . ' GMT');
//header('Last-Modified: ' . gmdate('D, d M Y H:i:s T', $mtime));
header('Content-type: ' . $mimetype);
echo $qrData;
exit;

function normalizeColor($color)
{
    $color = preg_replace('/[^a-fA-F0-9]+/', '', $color); // only hex digits
    $color = substr('000000'.$color, -6); // only 6 digits, pad with leading zeros
    $rgb = array(
        'r' => hexdec(substr($color, 0, 2)),
        'g' => hexdec(substr($color, 2, 2)),
        'b' => hexdec(substr($color, 4, 2)),
    );
    return $rgb;
}