watch.twip-network.org/index.php

<?php

function include_ob($file){
    ob_start();
    include $file;
    return ob_get_clean();
}

function sanitize_template_strings($indata){
    $sanit_pattern = '/<template.*>/is';
    return preg_replace($sanit_pattern, '', $indata);
}

session_start();
require_once 'config.php';

$paths_to_check = array();


$page = basename($_SERVER['QUERY_STRING']);

$nav = include_ob("$template_dir/navigation.html");

if(empty($page)){
    $page = 'index';
}

// Check if user is logged in
if (isset($_SESSION['user_id'])) {
    if ($user['isAdmin'] == 1) {
        $paths_to_check[] = "pages/admin";
    }
    
    $paths_to_check[] = "pages/user";
}
$paths_to_check[] = "pages/global";

$page_file = "$template_dir/404.html";

foreach($paths_to_check as $page_dir){
    $page_file_tmp = "$page_dir/$page.html";
    if(file_exists($page_file_tmp)){
        $page_file = $page_file_tmp;
        break;
    }
}
$page_data = include_ob($page_file);

$output = file_get_contents("$template_dir/skeleton.html");
$output = str_replace('<template name="navigation">', $nav, $output);

if (isset($_SESSION['user_id'])) {
    $hash = md5(strtolower(trim($_SESSION['user_email'])));
    $gravatarUrl = "https://www.gravatar.com/avatar/$hash?s=100";
    $gravatarTag = "<img src='$gravatarUrl' alt='Gravatar Profile Picture'>";
    $page_data = str_replace('<template name="gravatar image">', $gravatarTag, $page_data);
    
    $page_data = str_replace('<template name="username">', $_SESSION['user_username'], $page_data);
}


$page_regex = '/<!--PAGENAME=(.*?)-->/s';

if(preg_match($page_regex, $page_data, $matches)){
    $page_name = $matches[1];
    $page_data = preg_replace($page_regex, '', $page_data);
}
else{
    $page_name = ucfirst($page);
}

$output = str_replace('<template name="page name">', $page_name, $output);
$output = str_replace('<template name="page content">', $page_data, $output);

echo $output;
?>