CSocServApple::Authorize

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

	$authError = SOCSERV_AUTHORISATION_ERROR;

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

		$entityOAuth = $this->getEntityOAuth($_REQUEST['code']);
		if ($entityOAuth->GetAccessToken($redirect_uri) !== false)
		{
			$arUser = $entityOAuth->getCurrentUser();
			if (is_array($arUser) && isset($arUser["email"]))
			{
				$arFields = $this->prepareUser($arUser);
				$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)
	{
		$arState = array();
		parse_str(html_entity_decode($_REQUEST["state"]), $arState);

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

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

				foreach ($arUrlQuery as $key => $value)
				{
					foreach ($aRemove as $param)
					{
						if (strpos($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") && strpos($url, "current_fieldset=") === false)
	{
		$url .= ((strpos($url, "?") === false) ? '?' : '&') . "current_fieldset=SOCSERV";
	}
	LocalRedirect($url);
}