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wp-content/plugins/mailpoet/lib/Captcha/CaptchaRenderer.php

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+<?php declare(strict_types = 1);
+
+namespace MailPoet\Captcha;
+
+if (!defined('ABSPATH')) exit;
+
+
+use MailPoet\Config\Env;
+use MailPoet\Util\Headers;
+use MailPoetVendor\Gregwar\Captcha\CaptchaBuilder;
+
+class CaptchaRenderer {
+  const DEFAULT_WIDTH = 220;
+  const DEFAULT_HEIGHT = 60;
+
+  private CaptchaPhrase $phrase;
+
+  public function __construct(
+    CaptchaPhrase $phrase
+  ) {
+    $this->phrase = $phrase;
+  }
+
+  public function isSupported(): bool {
+    return extension_loaded('gd') && function_exists('imagettftext');
+  }
+
+  public function renderAudio(string $sessionId): void {
+    $audioPath = Env::$assetsPath . '/audio/';
+    $phrase = $this->getPhrase($sessionId);
+
+    $files = [];
+    foreach (str_split($phrase) as $character) {
+      $file = $audioPath . strtolower($character) . '.mp3';
+      if (!file_exists($file)) {
+        throw new \RuntimeException("File not found.");
+      }
+      $files[] = $file;
+    }
+
+    Headers::setNoCacheHeaders();
+    header('Content-Type: audio/mpeg');
+    foreach ($files as $file) {
+      readfile($file);
+    }
+  }
+
+  public function renderImage(string $sessionId, $width = null, $height = null): void {
+    if (!$this->isSupported()) {
+      return;
+    }
+
+    $width = (isset($width) && $width > 0) ? intval($width) : self::DEFAULT_WIDTH;
+    $height = (isset($height) && $height > 0) ? intval($height) : self::DEFAULT_HEIGHT;
+
+    $fontNumbers = array_merge(range(0, 3), [5]); // skip font #4
+    $fontNumber = $fontNumbers[mt_rand(0, count($fontNumbers) - 1)];
+
+    $reflector = new \ReflectionClass(CaptchaBuilder::class);
+    $captchaDirectory = dirname((string)$reflector->getFileName());
+    $font = $captchaDirectory . '/Font/captcha' . $fontNumber . '.ttf';
+
+    $phrase = $this->getPhrase($sessionId);
+    $builder = CaptchaBuilder::create($phrase)
+      ->setBackgroundColor(255, 255, 255)
+      ->setTextColor(1, 1, 1)
+      ->setMaxBehindLines(0)
+      ->build($width, $height, $font);
+
+    Headers::setNoCacheHeaders();
+    header('Content-Type: image/jpeg');
+    $builder->output();
+  }
+
+  public function refreshPhrase(string $sessionId): string {
+    return $this->phrase->createPhrase($sessionId);
+  }
+
+  private function getPhrase(string $sessionId): string {
+    $phrase = $this->phrase->getPhrase($sessionId);
+    if (!$phrase) {
+      throw new \RuntimeException("No CAPTCHA phrase was generated.");
+    }
+    return $phrase;
+  }
+}