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<?php declare(strict_types = 0);
/*
** Zabbix
** Copyright (C) 2001-2023 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 CValueMapHelper {
/**
* Apply value mapping to value.
* If value map or mapping is not found, unchanged value is returned,
* otherwise mapped value returned in format: "<mapped_value> (<initial_value>)".
*
* @param int $value_type Item value type.
* @param string $value Value that mapping should be applied to.
* @param array $valuemap Valuemap array.
* @param array $valuemap['mappings'] (optional) Valuemap mappings array.
*
* @return string
*/
public static function applyValueMap($value_type, string $value, array $valuemap): string {
$newvalue = static::getMappedValue($value_type, $value, $valuemap);
return ($newvalue !== false) ? $newvalue.' ('.$value.')' : $value;
}
/**
* Get mapping for value.
*
* @param int $value_type Item value type.
* @param string $value Value that mapping should be applied to.
* @param array $valuemap Valuemap array.
* @param array $valuemap['mappings'] Valuemap mappings array.
*
* @return string|bool If there is no mapping return false, return mapped value otherwise.
*/
public static function getMappedValue($value_type, string $value, array $valuemap) {
$newvalue = false;
if (array_key_exists('mappings', $valuemap)) {
foreach ($valuemap['mappings'] as $mapping) {
if ($mapping['type'] == VALUEMAP_MAPPING_TYPE_DEFAULT) {
$newvalue = $mapping['newvalue'];
}
elseif (static::matchMapping($value_type, $value, $mapping)) {
$newvalue = $mapping['newvalue'];
break;
}
}
}
return $newvalue;
}
/**
* Check value match against single mapping. Return true on success, false otherwise.
*
* @param int $value_type Item value type.
* @param string $value Value to check against mapping.
* @param array $mapping Array of single mapping.
* @param string $mapping['type'] Type of mapping.
* @param string $mapping['value] Value of mapping.
*/
public static function matchMapping($value_type, string $value, array $mapping): bool {
$match_numeric = ($value_type == ITEM_VALUE_TYPE_FLOAT || $value_type == ITEM_VALUE_TYPE_UINT64);
$result = false;
switch ($mapping['type']) {
case VALUEMAP_MAPPING_TYPE_EQUAL:
$result = $match_numeric
? (floatval($value) == floatval($mapping['value']))
: ($value === $mapping['value']);
break;
case VALUEMAP_MAPPING_TYPE_GREATER_EQUAL:
$result = ($match_numeric && floatval($value) >= floatval($mapping['value']));
break;
case VALUEMAP_MAPPING_TYPE_LESS_EQUAL:
$result = ($match_numeric && floatval($value) <= floatval($mapping['value']));
break;
case VALUEMAP_MAPPING_TYPE_IN_RANGE:
if (!$match_numeric) {
break;
}
$ranges_parser = new CRangesParser(['with_minus' => true, 'with_float' => true, 'with_suffix' => true]);
if ($ranges_parser->parse($mapping['value']) == CParser::PARSE_SUCCESS) {
$value = floatval($value);
foreach ($ranges_parser->getRanges() as $ranges) {
if ($value == floatval($ranges[0])
|| (count($ranges) == 2 && $value >= floatval($ranges[0])
&& $value <= floatval($ranges[1]))) {
$result = true;
break;
}
}
}
break;
case VALUEMAP_MAPPING_TYPE_REGEXP:
$result = (!$match_numeric
&& @preg_match('/'.str_replace('/', '\/', $mapping['value']).'/', $value) == 1);
break;
case VALUEMAP_MAPPING_TYPE_DEFAULT:
$result = true;
break;
}
return $result;
}
}
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