<?php
class ContactController extends ContactControllerCore
{
    public function postProcess()
    {
        session_start();
        $filename = _PS_ROOT_DIR_ . 'banned.txt';

        if (Tools::isSubmit('submitMessage')) {

            $message = Tools::getValue('message');
            $from = Tools::getValue('from');

            if (file_exists($filename)) {

                $banned_in_email = array();
                $banned_content = ['email marketing'];
                $target = Context::getContext()->link->getPageLink('contact');

                try {
                    $file = preg_replace("/(^[\r\n]*|[\r\n]+)[\s\t]*[\r\n]+/", "\n", $filename);
                    $file = new SplFileObject($file);
                } catch (LogicException $exception) {
                    die('SplFileObject : ' . $exception->getMessage());
                }
                while ($file->valid()) {
                    $line = $file->fgets();
                    array_push($banned_in_email, trim($line));
                }
                $file = null;

                $_SESSION["bannedctc"] = "notbanned";

                foreach ($banned_in_email as $string) {

                    if (strstr($from, $string)) {
                        //$this->errors[] = Tools::displayError('This email address is not allowed');
                        $_SESSION["bannedctc"] = "banned";
                        Tools::redirectAdmin($target);
                    }
                }

                foreach ($banned_content as $string) {
                    if (strstr($message, $string)) {
                        //$this->errors[] = Tools::displayError('Invalid Content');
                        $_SESSION["bannedctc"] = "banned";
                        Tools::redirectAdmin($target);
                    }
                }
            }
        }
        echo $_SESSION["bannedctc"];
        parent::postProcess();
    }
}