CSocServFacebook::getUrl

public function getUrl($arParams)
{
	global $APPLICATION;

	if(IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
	{
		$redirect_uri = static::CONTROLLER_URL."/redirect.php";
		$state = $this->getEntityOAuth()->GetRedirectURI()."?check_key=".CSocServAuthManager::getUniqueKey()."&state=";
		$backurl = $APPLICATION->GetCurPageParam('', array("logout", "auth_service_error", "auth_service_id", "backurl"));
		$state .= urlencode("state=".urlencode("backurl=".urlencode($backurl).(isset($arParams['BACKURL']) ? '&redirect_url='.urlencode($arParams['BACKURL']) : '')));
	}
	else
	{
		$state = 'site_id='.SITE_ID.'&backurl='.urlencode($APPLICATION->GetCurPageParam('check_key='.CSocServAuthManager::getUniqueKey(), array("logout", "auth_service_error", "auth_service_id", "backurl"))).(isset($arParams['BACKURL']) ? '&redirect_url='.urlencode($arParams['BACKURL']) : '');
		$redirect_uri = $this->getEntityOAuth()->GetRedirectURI();
	}

	return $this->getEntityOAuth()->GetAuthUrl($redirect_uri, $state);
}