captcha-module/Application/Controller/ImageGeneratorController.php
2023-07-19 09:05:40 +00:00

103 lines
3.2 KiB
PHP

<?php
declare(strict_types=1);
namespace OxidProfessionalServices\Captcha\Application\Controller;
use OxidEsales\Eshop\Application\Controller\FrontendController;
use OxidEsales\Eshop\Core\Exception\StandardException;
use OxidEsales\Eshop\Core\Registry;
use OxidProfessionalServices\Captcha\Application\Shared\Options;
use Throwable;
class ImageGeneratorController extends FrontendController
{
use Options;
protected $emac;
protected int $imageHeight = 18;
protected int $imageWidth = 80;
protected $fontSize = 14;
public function init()
{
parent::init();
$this->emac = Registry::getRequest()->getRequestEscapedParameter('e_mac', null);
if ($this->emac) {
$this->emac = $this->decodeEmac($this->emac);
}
}
public function render()
{
parent::render();
try {
if (!$this->emac) {
throw new StandardException('No e_mac parameter given');
}
$image = $this->generateVerificationImage();
if (!$image) {
throw new StandardException('Image generation failed by returning NULL');
}
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
exit;
} catch (Throwable $e) {
Registry::getLogger()->error(sprintf('%s() | %s', __METHOD__, $e->getMessage()), [$e]);
http_response_code(400);
exit(1);
}
}
protected function decodeEmac(string $emac): string
{
$decryptor = new \OxidEsales\Eshop\Core\Decryptor();
$key = $this->getOeCaptchaKey();
return $decryptor->decrypt($emac, $key);
}
protected function generateVerificationImage()
{
$image = null;
switch (true) {
case function_exists('imagecreatetruecolor'):
$image = imagecreatetruecolor($this->imageWidth, $this->imageHeight);
break;
case function_exists('imagecreate'):
$image = imagecreate($this->imageWidth, $this->imageHeight);
break;
default:
return null;
}
$textX = (int)ceil(($this->imageWidth - strlen($this->emac) * imagefontwidth($this->fontSize)) / 2);
$textY = (int)ceil(($this->imageHeight - imagefontheight($this->fontSize)) / 2) - 1;
$colors = [
'text' => imagecolorallocate($image, 0, 0, 0),
'shadow1' => imagecolorallocate($image, 200, 200, 200),
'shadow2' => imagecolorallocate($image, 100, 100, 100),
'background' => imagecolorallocate($image, 255, 255, 255),
'border' => imagecolorallocate($image, 0, 0, 0),
];
imagefill($image, 0, 0, $colors['background']);
imagerectangle($image, 0, 0, $this->imageWidth - 2, $this->imageHeight - 2, $colors['border']);
imagestring($image, $this->fontSize, $textX + 1, $textY + 0, $this->emac, $colors['shadow2']);
imagestring($image, $this->fontSize, $textX + 0, $textY + 1, $this->emac, $colors['shadow1']);
imagestring($image, $this->fontSize, $textX, $textY, $this->emac, $colors['text']);
return $image;
}
}