init.php


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<?php
class Af_Youtube_Thumb extends Plugin {
	private $host;

	function about() {
		return array(null,
			"Show Youtube videos as clickable thumbnails",
			"fox");
	}

	function init($host) {
		$this->host = $host;

		$host->add_hook($host::HOOK_RENDER_ENCLOSURE, $this);
	}

	function get_css() {
		return file_get_contents(__DIR__ . "/init.css");
	}

	function hook_render_enclosure($entry, $hide_images) {

		$matches = array();
		$url = $entry["content_url"];

		if (preg_match("/\/\/www\.youtube\.com\/v\/([\w-]+)/", $url, $matches) ||
			preg_match("/\/\/www\.youtube\.com\/watch?v=([\w-]+)/", $url, $matches) ||
			preg_match("/\/\/youtu.be\/([\w-]+)/", $url, $matches)) {

			$vid_id = $matches[1];

			$thumb_url = htmlspecialchars("https://img.youtube.com/vi/$vid_id/hqdefault.jpg");
			$url = htmlspecialchars($url);

			return "<a target='_blank' rel='noopener noreferrer' href=\"$url\" title=\"".$this->__("Click to open video")."\">
				<div class='youtube-thumb'>
					<img class='thumbnail' src=\"$thumb_url\" referrerpolicy='no-referrer'>
					<div class='watermark' src=\"plugins.local/af_youtube_thumb/img/youtube.svg\">
				</div>
			</a>";
		}
	}

	function api_version() {
		return 2;
	}

}