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<?php declare(strict_types = 1);
/*
** Zabbix
** Copyright (C) 2001-2021 Zabbix SIA
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**/
/**
* Class for validating math functions.
*/
class CMathFunctionValidator extends CValidator {
/**
* An options array.
*
* Supported options:
* 'parameters' => [] Number of required parameters of known math functions.
*
* @var array
*/
private $options = [
'parameters' => []
];
/**
* @param array $options
*/
public function __construct(array $options = []) {
$this->options = $options + $this->options;
}
/**
* Validate math function.
*
* @param array $token A token of CExpressionParserResult::TOKEN_TYPE_MATH_FUNCTION type.
*
* @return bool
*/
public function validate($token) {
if (!array_key_exists($token['data']['function'], $this->options['parameters'])) {
$this->setError(_s('unknown function "%1$s"', $token['data']['function']));
return false;
}
$num_parameters = count($token['data']['parameters']);
foreach ($this->options['parameters'][$token['data']['function']] as $rule) {
$is_valid = true;
if (array_key_exists('count', $rule)) {
$is_valid = $num_parameters == $rule['count'];
}
if ($is_valid && array_key_exists('min', $rule)) {
$is_valid = $num_parameters >= $rule['min'];
if ($is_valid && array_key_exists('step', $rule)) {
$is_valid = ($num_parameters - $rule['min']) % $rule['step'] == 0;
}
}
if ($is_valid && array_key_exists('max', $rule)) {
$is_valid = $num_parameters <= $rule['max'];
}
if ($is_valid) {
return true;
}
}
$this->setError(_s('invalid number of parameters in function "%1$s"', $token['data']['function']));
return false;
}
}
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