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<?php
/* Icinga Web 2 - EventDB | (c) 2017 Icinga Development Team | GPLv2+ */
namespace Icinga\Module\Eventdb\Data;
use Icinga\Data\Filter\Filter;
use Icinga\Data\Filter\FilterAnd;
use Icinga\Data\Filter\FilterOr;
use Icinga\Exception\InvalidPropertyException;
/**
* Class LegacyFilterParser
*
* Utility class to parse Icinga-web 1.x JSON filters of the EventDB module
*/
class LegacyFilterParser
{
/**
* @param $json string JSON data
* @param $host string Icinga host name (for default host filter and logging)
* @param $service string Icinga service name (for logging)
*
* @return Filter
* @throws InvalidPropertyException When filter could not be parsed
*/
static public function parse($json, $host, $service = null)
{
$json = static::fixJSONQuotes($json);
$data = json_decode($json, false, 5);
if (json_last_error() !== JSON_ERROR_NONE) {
throw new InvalidPropertyException(
'Could not decode legacy filter (host=%s)%s (%s): %s',
$host,
($service ? ' (service=' . $service . ')' : ''),
json_last_error_msg(),
$json
);
}
$filter = new FilterAnd();
if (property_exists($data, 'host')) {
// Note: we can' support regexp right now, but we replace '.*' to a normal wildcard
$data->host = str_replace('.*', '*', $data->host);
if ($data->host === '*') {
$data->host = null;
}
} else {
$data->host = $host;
}
if ($data->host !== null) {
$filter->andFilter(Filter::expression('host_name', '=', $data->host));
}
static::handleArray($filter, $data, 'programInclusion', 'program');
static::handleArray($filter, $data, 'programExclusion', 'program', '!=');
static::handleArray($filter, $data, 'priorityExclusion', 'priority', '!=');
static::handleArray($filter, $data, 'sourceExclusion', 'source', '!=');
static::handleArray($filter, $data, 'facilityExclusion', 'facility', '!=');
// TODO: msg - when really needed
// TODO: startTime - when really needed
// Note: any other field or data part gets ignored...
return $filter;
}
protected static function handleArray(Filter $filter, $data, $property, $filterAttr, $op = '=')
{
if (property_exists($data, $property) && ! empty($data->$property)) {
if ($op === '!=') {
$subFilter = $filter;
} else {
$subFilter = new FilterOr;
}
/*
if (is_array($data->$property) && count($data->$property) === 1) {
$data->$property = current($data->$property);
}
*/
if (! is_array($data->$property)) {
$data->$property = array($data->$property);
}
foreach ($data->$property as $val) {
$subFilter->addFilter(Filter::expression($filterAttr, $op, $val));
}
if ($subFilter !== $filter) {
$filters = $subFilter->filters();
if ($filter->isChain() && count($filters) > 1) {
$filter->andFilter($subFilter);
} else {
$filter->andFilter(current($filters));
}
}
}
}
/**
* @author partially by NikiC https://stackoverflow.com/users/385378/nikic
* @source partially from https://stackoverflow.com/a/20440596/449813
*
* @param $json string
*
* @return string
*/
public static function fixJSONQuotes($json)
{
// fix unquoted identifiers
$json = preg_replace('/([{,]+)(\s*)([^"]+?)\s*:/', '$1"$3":', $json);
$regex = <<<'REGEX'
~
"[^"\\]*(?:\\.|[^"\\]*)*"
(*SKIP)(*F)
| '([^'\\]*(?:\\.|[^'\\]*)*)'
~x
REGEX;
return preg_replace_callback($regex, function ($matches) {
return '"' . preg_replace('~\\\\.(*SKIP)(*F)|"~', '\\"', $matches[1]) . '"';
}, $json);
}
/**
* Basic check if it looks like a JSON filter
*
* @param $string
*
* @return bool
*/
static public function isJsonFilter($string)
{
if (! $string || ! is_string($string)) {
return false;
}
$string = trim($string);
if (empty($string)) {
return false;
}
if (preg_match('/^\{.*\}$/s', $string)) {
// looks like JSON data
return true;
}
return false;
}
}
|
