52 lines
1.9 KiB
PHP
52 lines
1.9 KiB
PHP
<?php
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/**
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; under version 2
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* of the License (non-upgradable).
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright (c) 2016-2017 (original work) Open Assessment Technologies SA ;
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*/
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namespace oat\tao\model\security;
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/**
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* This traits let's you generate a random token
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*
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* @author Jean-Sébastien Conan <jean-sebastien.conan@vesperiagroup.com>
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* @author Bertrand Chevrier <bertrand@taotesting.com>
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*/
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trait TokenGenerator
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{
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/**
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* Generates a security token
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* @param int $length the expected token length
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* @return string the token
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* @throws \common_Exception
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*/
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protected function generate($length = 40)
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{
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try {
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return bin2hex(random_bytes($length / 2));
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} catch (\TypeError $e) {
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// This is okay, so long as `Error` is caught before `Exception`.
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throw new \common_Exception("An unexpected error has occurred while trying to generate a security token", 0, $e);
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} catch (\Error $e) {
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// This is required, if you do not need to do anything just rethrow.
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throw new \common_Exception("An unexpected error has occurred while trying to generate a security token", 0, $e);
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} catch (\Exception $e) {
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throw new \common_Exception("Could not generate a security token. Is our OS secure?", 0, $e);
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}
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}
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}
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