new-bigly-chat/libs/auth.php

<?php
    require("../libs/test_secret.php");
    
    function auth($token) {
        if (is_null($token)) return null;

        global $db;

        $stmt = $db->prepare("SELECT * FROM main.token WHERE token = ?");
        $stmt->execute([$token]);
        
        $result = $stmt->fetch(PDO::FETCH_ASSOC);
        if (!$result) return null;
        
        $username = $result['username'];
        
        $stmt = $db->prepare("SELECT * FROM main.auth WHERE username = ?");
        $stmt->execute([$username]);
        
        $result = $stmt->fetch(PDO::FETCH_ASSOC);
        if (!$result) return  null;
        
        return $username;
    }
    
    $username = auth($_COOKIE['token']);
?>