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