ldc-pfcgen/app/ErrorHandler/CustomHtmlErrorRenderer.php

<?php

/**
 * Slim Framework (https://slimframework.com)
 *
 * @license https://github.com/slimphp/Slim/blob/4.x/LICENSE.md (MIT License)
 */

declare(strict_types=1);

namespace App\ErrorHandler;

use Slim\Error\AbstractErrorRenderer;
use Throwable;

use function get_class;
use function htmlentities;
use function sprintf;

/**
 * Default Slim application HTML Error Renderer
 */
class CustomHtmlErrorRenderer extends AbstractErrorRenderer
{
  /**
   * @param Throwable $exception
   * @param bool      $displayErrorDetails
   * @return string
   */
  public function __invoke(Throwable $exception, bool $displayErrorDetails): string
  {
    if ($displayErrorDetails) {
      $html = '<p>The application could not run because of the following error:</p>';
      $html .= '<h2>Details</h2>';
      $html .= $this->renderExceptionFragment($exception);
    } else {
      $html = "<p><b>{$exception->getMessage()}</b><br>{$this->getErrorDescription($exception)}</p>";
    }

    return $this->renderHtmlBody($this->getErrorTitle($exception), $html);
  }

  /**
   * @param Throwable $exception
   * @return string
   */
  private function renderExceptionFragment(Throwable $exception): string
  {
    $html = sprintf('<div><strong>Type:</strong> %s</div>', get_class($exception));

    $code = $exception->getCode();
    if ($code !== null) {
      $html .= sprintf('<div><strong>Code:</strong> %s</div>', $code);
    }

    $message = $exception->getMessage();
    if ($message !== null) {
      $html .= sprintf('<div><strong>Message:</strong> %s</div>', htmlentities($message));
    }

    $file = $exception->getFile();
    if ($file !== null) {
      $html .= sprintf('<div><strong>File:</strong> %s</div>', $file);
    }

    $line = $exception->getLine();
    if ($line !== null) {
      $html .= sprintf('<div><strong>Line:</strong> %s</div>', $line);
    }

    $trace = $exception->getTraceAsString();
    if ($trace !== null) {
      $html .= '<h2>Trace</h2>';
      $html .= sprintf('<pre>%s</pre>', htmlentities($trace));
    }

    return $html;
  }

  /**
   * @param string $title
   * @param string $html
   * @return string
   */
  public function renderHtmlBody(string $title = '', string $html = ''): string
  {
    return sprintf(
      <<<HTML
      <html>
        <head>
        <meta http-equiv='Content-Type' content='text/html; charset=utf-8'>
        <title>%s</title>
        <style>
          body{margin:0;padding:30px;font:12px/1.5 Helvetica,Arial,Verdana,sans-serif}
          h1{margin:0;font-size:48px;font-weight:normal;line-height:48px}
          strong{display:inline-block;width:65px}
        </style>
        </head>
        <body>
        <h1>%s</h1>
        <div>%s</div>
        </body>
      </html>
      HTML,
      $title,
      $title,
      $html
    );
  }
}