FileAllowedTypesValidator.php

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

class FileAllowedTypesValidator extends \TYPO3\CMS\Form\Validation\AbstractValidator implements \TYPO3\CMS\Form\Validation\ValidatorInterface {

    const LOCALISATION_OBJECT_NAME = 'tx_form_system_validate_fileallowedtypes';

    protected $allowedTypes;

    public function __construct($arguments) {
        $this->setAllowedTypes($arguments['types']);
        parent::__construct($arguments);
    }

    public function isValid() {
        if ($this->requestHandler->has($this->fieldName)) {
            $fileValue = $this->requestHandler->getByMethod($this->fieldName);
            $value = strtolower($fileValue['type']);
            if (!in_array($value, $this->allowedTypes)) {
                return FALSE;
            }
        }
        return TRUE;
    }

    public function setAllowedTypes($allowedTypes) {
        $allowedTypes = strtolower($allowedTypes);
        $this->allowedTypes = \TYPO3\CMS\Core\Utility\GeneralUtility::trimExplode(', ', $allowedTypes);
        return $this;
    }

    protected function substituteValues($message) {
        $message = str_replace('%allowedTypes', implode(',', $this->allowedTypes), $message);
        return $message;
    }

}