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<?php
/* Icinga DB Web | (c) 2021 Icinga GmbH | GPLv2 */
namespace Icinga\Module\Icingadb\Common;
use Icinga\Application\Logger;
use Icinga\Module\Icingadb\Model\Host;
use ipl\Orm\Model;
use ipl\Orm\Query;
use ipl\Orm\ResultSet;
use function ipl\Stdlib\get_php_type;
trait Macros
{
/**
* Get the given string with macros being resolved
*
* @param string $input The string in which to look for macros
* @param Model $object The host or service used to resolve the macros
*
* @return string
*/
public function expandMacros(string $input, Model $object): string
{
if (preg_match_all('@\$([^\$\s]+)\$@', $input, $matches)) {
foreach ($matches[1] as $key => $value) {
$newValue = $this->resolveMacro($value, $object);
if ($newValue !== $value) {
$input = str_replace($matches[0][$key], $newValue, $input);
}
}
}
return $input;
}
/**
* Resolve a macro based on the given object
*
* @param string $macro The macro to resolve
* @param Model $object The host or service used to resolve the macros
*
* @return string
*/
public function resolveMacro(string $macro, Model $object): string
{
if ($object instanceof Host) {
$objectType = 'host';
} else {
$objectType = 'service';
}
$path = null;
$macroType = $objectType;
$isCustomVar = false;
if (preg_match('/^((host|service)\.)?vars\.(.+)/', $macro, $matches)) {
if (! empty($matches[2])) {
$macroType = $matches[2];
}
$path = $matches[3];
$isCustomVar = true;
} elseif (preg_match('/^(\w+)\.(.+)/', $macro, $matches)) {
$macroType = $matches[1];
$path = $matches[2];
}
try {
if ($path !== null) {
if ($macroType !== $objectType) {
$value = $object->$macroType;
} else {
$value = $object;
}
$properties = explode('.', $path);
do {
$column = array_shift($properties);
if ($value instanceof Query || $value instanceof ResultSet || is_array($value)) {
Logger::debug(
'Failed to resolve property "%s" on a "%s" type.',
$isCustomVar ? 'vars' : $column,
get_php_type($value)
);
$value = null;
break;
}
if ($isCustomVar) {
$value = $value->vars[$path];
break;
}
$value = $value->$column;
} while (! empty($properties) && $value !== null);
} else {
$value = $object->$macro;
}
} catch (\Exception $e) {
$value = null;
Logger::debug('Unable to resolve macro "%s". An error occurred: %s', $macro, $e);
}
if ($value instanceof Query || $value instanceof ResultSet || is_array($value)) {
Logger::debug(
'It is not allowed to use "%s" as a macro which produces a "%s" type as a result.',
$macro,
get_php_type($value)
);
$value = null;
}
return $value !== null ? $value : $macro;
}
}
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