RemoveXssFilter.php

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<?php
namespace TYPO3\CMS\Form\Filter;

class RemoveXssFilter implements \TYPO3\CMS\Form\Filter\FilterInterface {

    public function filter($value) {
        $value = stripslashes($value);
        $value = html_entity_decode($value, ENT_QUOTES);
        $filteredValue = \TYPO3\CMS\Core\Utility\GeneralUtility::removeXSS($value);
        return $filteredValue;
    }

}