FormProtectionFactory.php

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<?php
namespace TYPO3\CMS\Core\FormProtection;

class FormProtectionFactory {

    static protected $instances = array();

    private function __construct() {

    }

    static public function get($className = NULL) {
        if ($className === NULL) {
            $className = self::getClassNameByState();
        }
        if (!isset(self::$instances[$className])) {
            self::createAndStoreInstance($className);
        }
        return self::$instances[$className];
    }

    static protected function getClassNameByState() {
        switch (TRUE) {
            case self::isInstallToolSession():
                $className = 'TYPO3\\CMS\\Core\\FormProtection\\InstallToolFormProtection';
                break;
            case self::isBackendSession():
                $className = 'TYPO3\\CMS\\Core\\FormProtection\\BackendFormProtection';
                break;
            case self::isFrontendSession():

            default:
                $className = 'TYPO3\\CMS\\Core\\FormProtection\\DisabledFormProtection';
        }
        return $className;
    }

    static protected function isInstallToolSession() {
        return defined('TYPO3_enterInstallScript') && TYPO3_enterInstallScript;
    }

    static protected function isBackendSession() {
        return isset($GLOBALS['BE_USER']) && $GLOBALS['BE_USER'] instanceof \TYPO3\CMS\Core\Authentication\BackendUserAuthentication && isset($GLOBALS['BE_USER']->user['uid']);
    }

    static protected function isFrontendSession() {
        return is_object($GLOBALS['TSFE']) && $GLOBALS['TSFE']->fe_user instanceof \TYPO3\CMS\Frontend\Authentication\FrontendUserAuthentication && isset($GLOBALS['TSFE']->fe_user->user['uid']) && TYPO3_MODE === 'FE';
    }

    static protected function createAndStoreInstance($className) {
        if (!class_exists($className, TRUE)) {
            throw new \InvalidArgumentException('$className must be the name of an existing class, but ' . 'actually was "' . $className . '".', 1285352962);
        }
        $instance = \TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance($className);
        if (!$instance instanceof \TYPO3\CMS\Core\FormProtection\AbstractFormProtection) {
            throw new \InvalidArgumentException('$className must be a subclass of ' . 'TYPO3\\CMS\\Core\\FormProtection\\AbstractFormProtection, but actually was "' . $className . '".', 1285353026);
        }
        self::$instances[$className] = $instance;
    }

    static public function set($className, \TYPO3\CMS\Core\FormProtection\AbstractFormProtection $instance) {
        self::$instances[$className] = $instance;
    }

    static public function purgeInstances() {
        foreach (self::$instances as $key => $instance) {
            $instance->__destruct();
            unset(self::$instances[$key]);
        }
    }

}