CSocServFacebook::Authorize

public function Authorize()
{
	global $APPLICATION;
	$APPLICATION->RestartBuffer();

	$authError = SOCSERV_AUTHORISATION_ERROR;

	if(
		isset($_REQUEST["code"]) && $_REQUEST["code"] <> ''
		&& CSocServAuthManager::CheckUniqueKey()
	)
	{
		if(IsModuleInstalled('bitrix24') && defined('BX24_HOST_NAME'))
		{
			$redirect_uri = static::CONTROLLER_URL."/redirect.php";
		}
		else
		{
			$redirect_uri = $this->getEntityOAuth()->GetRedirectURI();
		}

		$this->entityOAuth = $this->getEntityOAuth($_REQUEST['code']);
		if($this->entityOAuth->GetAccessToken($redirect_uri) !== false)
		{
			$arFBUser = $this->entityOAuth->GetCurrentUser();
			if(is_array($arFBUser) && isset($arFBUser["id"]))
			{
				$arFields = self::prepareUser($arFBUser);
				$authError = $this->AuthorizeUser($arFields);
			}
		}
	}

	$bSuccess = $authError === true;

	$url = ($APPLICATION->GetCurDir() == "/login/") ? "" : $APPLICATION->GetCurDir();
	$aRemove = array("logout", "auth_service_error", "auth_service_id", "code", "error_reason", "error", "error_description", "check_key", "current_fieldset");

	if(isset($_REQUEST["state"]) && $bSuccess)
	{
		$arState = array();
		parse_str($_REQUEST["state"], $arState);

		if(isset($arState['backurl']) || isset($arState['redirect_url']))
		{
			$url = !empty($arState['redirect_url']) ? $arState['redirect_url'] : $arState['backurl'];
			if(mb_substr($url, 0, 1) !== "#")
			{
				$parseUrl = parse_url($url);

				$urlPath = $parseUrl["path"];
				$arUrlQuery = explode('&', $parseUrl["query"]);

				foreach($arUrlQuery as $key => $value)
				{
					foreach($aRemove as $param)
					{
						if(mb_strpos($value, $param."=") === 0)
						{
							unset($arUrlQuery[$key]);
							break;
						}
					}
				}

				$url = (!empty($arUrlQuery)) ? $urlPath.'?'.implode("&", $arUrlQuery) : $urlPath;
			}
		}
	}

	if($authError === SOCSERV_REGISTRATION_DENY)
	{
		$url = (preg_match("/?/", $url)) ? $url.'&' : $url.'?';
		$url .= 'auth_service_id='.self::ID.'&auth_service_error='.$authError;
	}
	elseif($bSuccess !== true)
	{
		$url = (isset($urlPath)) ? $urlPath.'?auth_service_id='.self::ID.'&auth_service_error='.$authError : $GLOBALS['APPLICATION']->GetCurPageParam(('auth_service_id='.self::ID.'&auth_service_error='.$authError), $aRemove);
	}

	if(CModule::IncludeModule("socialnetwork") && mb_strpos($url, "current_fieldset=") === false)
	{
		$url .= ((mb_strpos($url, "?") === false) ? '?' : '&')."current_fieldset=SOCSERV";
	}
?>