UrlPreview::showView

static function showView($userField, $userFieldParams, &$cacheTag, $edit = false)
{
	global $APPLICATION;
	$edit = !!$edit;
	$cacheTag = '';

	if (!static::isEnabled())
	{
		return null;
	}

	$metadataId = (int)$userField['VALUE'][0];
	$metadata = false;
	if ($metadataId > 0)
	{
		$metadata = UrlMetadataTable::getById($metadataId)->fetch();
		if (isset($metadata['TYPE']) && $metadata['TYPE'] == UrlMetadataTable::TYPE_TEMPORARY)
		{
			$metadata = static::resolveTemporaryMetadata($metadata['ID']);
		}
	}

	if (is_array($metadata))
	{
		$fullUrl = static::unfoldShortLink($metadata['URL']);
		if ($metadata['TYPE'] == UrlMetadataTable::TYPE_DYNAMIC)
		{
			$routeRecord = Router::dispatch(new Uri($fullUrl));

			if (isset($routeRecord['MODULE']) && Loader::includeModule($routeRecord['MODULE']))
			{
				$className = $routeRecord['CLASS'];
				$routeRecord['PARAMETERS']['URL'] = $metadata['URL'];
				$parameters = $routeRecord['PARAMETERS'];

				if ($edit && (!method_exists($className, 'checkUserReadAccess') || !$className::checkUserReadAccess($parameters, static::getCurrentUserId())))
				{
					return null;
				}

				if (method_exists($className, 'buildPreview'))
				{
					$metadata['HANDLER'] = $routeRecord;
					$metadata['HANDLER']['BUILD_METHOD'] = 'buildPreview';
				}

				if (method_exists($className, 'getCacheTag'))
				{
					$cacheTag = $className::getCacheTag();
				}
			}
			elseif (!$edit)
			{
				return null;
			}
		}
	}
	elseif (!$edit)
	{
		return null;
	}

	ob_start();
	$APPLICATION->IncludeComponent(
		'bitrix:main.urlpreview',
		'',
		array(
			'USER_FIELD' => $userField,
			'METADATA' => is_array($metadata) ? $metadata : [],
			'PARAMS' => $userFieldParams,
			'EDIT' => ($edit ? 'Y' : 'N'),
			'CHECK_ACCESS' => ($edit ? 'Y' : 'N'),
		)
	);
	return ob_get_clean();
}