hmpc.php

<?php

require_once('vendor/autoload.php');

use Symfony\Component\Yaml\Yaml;

$config = Yaml::parse(file_get_contents('config.yaml'));

$json = file_get_contents('php://input');
$object = json_decode($json);
if ($object === false || !isset($object->action)) {
    die(json_encode(['error' => 'What']));
}

$action = $object->action;

if (array_key_exists($action, $config['commands'])) {
    $command = $config['commands'][$action];
    $result = shell_exec($command);
    die(json_encode(['success' => 'Ok']));
} else {
    die(json_encode(['error' => 'Command not found']));
}