host = $host;
        $host->add_hook($host::HOOK_ARTICLE_FILTER, $this);
        $host->add_hook($host::HOOK_IFRAME_WHITELISTED, $this);
    }
    function hook_iframe_whitelisted($src) {
        return in_array($src, ["www.youtube.com", "youtube.com", "youtu.be"]);
    }
    function hook_article_filter($article) {
        // $debug = json_encode($article);
        // Match allowed links and extract "video ID"
        if (preg_match_all("/.*(youtube|youtu)\.(com|be)\/watch\?v=([\w\d_-]+).*/i",
                           $article["link"], $matches, PREG_PATTERN_ORDER)) {
            if ($matches[3][0]) {
                $link = "https://www.youtube.com/embed/" . $matches[3][0];
                $attributes = "width='819' height='460' class='youtube-player' allowfullscreen";
                $yframe = "";
                $article["content"] = $yframe;
            }
        }
        $description = str_replace("\n", "
", $article["enclosures"][0][3]);
        if (strlen($description) > 0) {
            $article["content"] .= "
" . $description ;
        } else {
            $article["content"] .= "
No video description available.";
        }
        return $article;
    }
    function api_version() {
        return 2;
    }
}