Basic changes made for smarty and base code

Application/Controller/ImageGeneratorController.php

@@ -0,0 +1,102 @@
+<?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 $imageHeight = 18;
+    protected $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;
+        }
+        $textX = ($this->imageWidth - strlen($this->emac) * imagefontwidth($this->fontSize)) / 2;
+        $textY = ($this->imageHeight - imagefontheight($this->fontSize)) / 2;
+
+        $colors = [
+            'text'       => imagecolorallocate($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 - 1, $this->imageHeight - 1, $colors['border']);
+        imagestring($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;
+    }
+}