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<?php
/*
** Zabbix
** Copyright (C) 2001-2020 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 CConditionValidator extends CValidator {
/**
* Error message if the formula is invalid.
*
* @var string
*/
public $messageInvalidFormula;
/**
* Error message if the formula contains a condition that is not defined in the "conditions" array.
*
* @var string
*/
public $messageMissingCondition;
/**
* Error message if the "conditions" array contains a condition that is not used in the formula.
*
* @var string
*/
public $messageUnusedCondition;
/**
* Error message if several triggers are compared with "and".
*
* @var string
*/
public $messageAndWithSeveralTriggers;
/**
* Validates the given condition formula and checks if the given conditions match the formula.
*
* @param array $object
*
* @return bool
*/
public function validate($object) {
if ($object['evaltype'] == CONDITION_EVAL_TYPE_AND) {
// get triggers count in formula
$trigger_count = 0;
foreach ($object['conditions'] as $condition) {
if (array_key_exists('conditiontype', $condition) && array_key_exists('operator', $condition)
&& $condition['conditiontype'] == CONDITION_TYPE_TRIGGER
&& $condition['operator'] == CONDITION_OPERATOR_EQUAL) {
$trigger_count++;
}
}
// check if multiple triggers are compared with AND
if ($trigger_count > 1) {
$this->error($this->messageAndWithSeveralTriggers);
return false;
}
}
// validate only custom expressions
if ($object['evaltype'] != CONDITION_EVAL_TYPE_EXPRESSION) {
return true;
}
// check if the formula is valid
$parser = new CConditionFormula();
if (!$parser->parse($object['formula'])) {
$this->error($this->messageInvalidFormula, $object['formula'], $parser->error);
return false;
}
// check that all conditions used in the formula are defined in the "conditions" array
$conditions = zbx_toHash($object['conditions'], 'formulaid');
$constants = array_unique(zbx_objectValues($parser->constants, 'value'));
foreach ($constants as $constant) {
if (!array_key_exists($constant, $conditions)) {
$this->error($this->messageMissingCondition, $constant, $object['formula']);
return false;
}
unset($conditions[$constant]);
}
// check that the "conditions" array has no unused conditions
if ($conditions) {
$condition = reset($conditions);
$this->error($this->messageUnusedCondition, $condition['formulaid'], $object['formula']);
return false;
}
return true;
}
}
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