AuthMemCookie.php

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<?php


class SimpleSAML_AuthMemCookie
{

    private static $instance = null;


    private $amcConfig;


    public static function getInstance()
    {
        if (self::$instance === null) {
            self::$instance = new SimpleSAML_AuthMemCookie();
        }

        return self::$instance;
    }


    private function __construct()
    {
        // load AuthMemCookie configuration
        $this->amcConfig = SimpleSAML_Configuration::getConfig('authmemcookie.php');
    }


    public function getAuthSource()
    {
        return $this->amcConfig->getString('authsource');
    }


    public function getCookieName()
    {
        $cookieName = $this->amcConfig->getString('cookiename', 'AuthMemCookie');
        if (!is_string($cookieName) || strlen($cookieName) === 0) {
            throw new Exception(
                "Configuration option 'cookiename' contains an invalid value. This option should be a string."
            );
        }

        return $cookieName;
    }


    public function getUsernameAttr()
    {
        $usernameAttr = $this->amcConfig->getString('username', null);

        return $usernameAttr;
    }


    public function getGroupsAttr()
    {
        $groupsAttr = $this->amcConfig->getString('groups', null);

        return $groupsAttr;
    }


    public function getMemcache()
    {
        $memcacheHost = $this->amcConfig->getString('memcache.host', '127.0.0.1');
        $memcachePort = $this->amcConfig->getInteger('memcache.port', 11211);

        $class = class_exists('Memcache') ? 'Memcache' : (class_exists('Memcached') ? 'Memcached' : FALSE);
        if (!$class) {
            throw new Exception('Missing Memcached implementation. You must install either the Memcache or Memcached extension.');
        }

        // Create the Memcache(d) object.
        $memcache = new $class();

        foreach (explode(',', $memcacheHost) as $memcacheHost) {
            $memcache->addServer($memcacheHost, $memcachePort);
        }

        return $memcache;
    }


    private function doLogout()
    {
        $cookieName = $this->getCookieName();

        // check if we have a valid cookie
        if (!array_key_exists($cookieName, $_COOKIE)) {
            return;
        }

        $sessionID = $_COOKIE[$cookieName];

        // delete the session from memcache
        $memcache = $this->getMemcache();
        $memcache->delete($sessionID);

        // delete the session cookie
        \SimpleSAML\Utils\HTTP::setCookie($cookieName, null);
    }


    public static function logoutHandler()
    {
        self::getInstance()->doLogout();
    }
}