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PhabricatorYoutubeRemarkupRule.php
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			<?php

			final class PhabricatorYoutubeRemarkupRule extends PhutilRemarkupRule {

			public function getPriority() {
			return 350.0;
			}

			public function apply($text) {
			try {
			$uri = new PhutilURI($text);
			} catch (Exception $ex) {
			return $text;
			}

			$domain = $uri->getDomain();
			if (!preg_match('/(^\|\.)youtube\.com\z/', $domain)) {
			return $text;
			}

			$v_params = array();

			$params = $uri->getQueryParamsAsPairList();
			foreach ($params as $pair) {
			list($k, $v) = $pair;
			if ($k === 'v') {
			$v_params[] = $v;
			}
			}

			if (count($v_params) !== 1) {
			return $text;
			}

			$v_param = head($v_params);

			$text_mode = $this->getEngine()->isTextMode();
			$mail_mode = $this->getEngine()->isHTMLMailMode();

			if ($text_mode \|\| $mail_mode) {
			return $text;
			}

			$youtube_src = 'https://www.youtube.com/embed/'.$v_param;

			$iframe = $this->newTag(
			'div',
			array(
			'class' => 'embedded-youtube-video',
			),
			$this->newTag(
			'iframe',
			array(
			'width' => '650',
			'height' => '400',
			'style' => 'margin: 1em auto; border: 0px;',
			'src' => $youtube_src,
			'frameborder' => 0,
			),
			''));

			return $this->getEngine()->storeText($iframe);
			}

			public function didMarkupText() {
			CelerityAPI::getStaticResourceResponse()
			->addContentSecurityPolicyURI('frame-src', 'https://www.youtube.com/');
			}

			}