YouTubeRenderer.php

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<?php
namespace TYPO3\CMS\Core\Resource\Rendering;

use TYPO3\CMS\Core\Resource\File;
use TYPO3\CMS\Core\Resource\OnlineMedia\Helpers\OnlineMediaHelperInterface;
use TYPO3\CMS\Core\Resource\OnlineMedia\Helpers\OnlineMediaHelperRegistry;
use TYPO3\CMS\Core\Utility\GeneralUtility;
use TYPO3\CMS\Core\Resource\FileInterface;
use TYPO3\CMS\Core\Resource\FileReference;

class YouTubeRenderer implements FileRendererInterface
{
    protected $onlineMediaHelper;

    public function getPriority()
    {
        return 1;
    }

    public function canRender(FileInterface $file)
    {
        return ($file->getMimeType() === 'video/youtube' || $file->getExtension() === 'youtube') && $this->getOnlineMediaHelper($file) !== false;
    }

    protected function getOnlineMediaHelper(FileInterface $file)
    {
        if ($this->onlineMediaHelper === null) {
            $orgFile = $file;
            if ($orgFile instanceof FileReference) {
                $orgFile = $orgFile->getOriginalFile();
            }
            if ($orgFile instanceof File) {
                $this->onlineMediaHelper = OnlineMediaHelperRegistry::getInstance()->getOnlineMediaHelper($orgFile);
            } else {
                $this->onlineMediaHelper = false;
            }
        }
        return $this->onlineMediaHelper;
    }

    public function render(FileInterface $file, $width, $height, array $options = null, $usedPathsRelativeToCurrentScript = false)
    {
        if ($file instanceof FileReference) {
            $autoplay = $file->getProperty('autoplay');
            if ($autoplay !== null) {
                $options['autoplay'] = $autoplay;
            }
        }

        $urlParams = array('autohide=1');
        if (!isset($options['controls']) || !empty($options['controls'])) {
            $urlParams[] = 'controls=2';
        }
        if (!empty($options['autoplay'])) {
            $urlParams[] = 'autoplay=1';
        }
        if (!empty($options['loop'])) {
            $urlParams[] = 'loop=1';
        }
        if (!isset($options['enablejsapi']) || !empty($options['enablejsapi'])) {
            $urlParams[] = 'enablejsapi=1&amp;origin=' . GeneralUtility::getIndpEnv('HTTP_HOST');
        }
        $urlParams[] = 'showinfo=' . (int)!empty($options['showinfo']);

        if ($file instanceof FileReference) {
            $orgFile = $file->getOriginalFile();
        } else {
            $orgFile = $file;
        }

        $videoId = $this->getOnlineMediaHelper($file)->getOnlineMediaId($orgFile);
        $src = sprintf(
            '//www.youtube%s.com/embed/%s?%s',
            !empty($options['no-cookie']) ? '-nocookie' : '',
            $videoId,
            implode('&amp;', $urlParams)
        );

        $attributes = ['allowfullscreen'];
        if ((int)$width > 0) {
            $attributes[] = 'width="' . (int)$width . '"';
        }
        if ((int)$height > 0) {
            $attributes[] = 'height="' . (int)$height . '"';
        }
        if (is_object($GLOBALS['TSFE']) && $GLOBALS['TSFE']->config['config']['doctype'] !== 'html5') {
            $attributes[] = 'frameborder="0"';
        }
        foreach (['class', 'dir', 'id', 'lang', 'style', 'title', 'accesskey', 'tabindex', 'onclick', 'poster', 'preload'] as $key) {
            if (!empty($options[$key])) {
                $attributes[] = $key . '="' . htmlspecialchars($options[$key]) . '"';
            }
        }

        return sprintf(
            '<iframe src="%s"%s></iframe>',
            $src,
            empty($attributes) ? '' : ' ' . implode(' ', $attributes)
        );
    }
}