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<?php

// store user @IP who can join this page (still have their status.php tab open) in a file.
$filename = '/var/tmp/havp/current_users.txt';
$user_ip = $_SERVER['REMOTE_ADDR'];

$isConnected = exec('sudo /usr/sbin/chilli_query list | awk '.escapeshellarg('($2 == "'.$user_ip.'") {print $5}'));
if ($isConnected === '0') {
        exit();
}

if ((!file_exists($filename)) || (filesize($filename) === 0)) {
        // Creating file and write user @IP.
        file_put_contents($filename, $user_ip.':TEMP'.PHP_EOL);
} else {
        // If we found duplicate user IP, it will not be writen again
        $found = false;
        $fh = fopen($filename, 'r');
        while (!feof($fh)) {
                $line = fgets($fh, 1024);
                if (preg_match('/^'.preg_quote($user_ip).':/', $line)) {
                        $found = true;
                        break;
                }
        }
        fclose($fh);

        // else we write user IP in the file
        if (!$found) {
                file_put_contents($filename, $user_ip.':TEMP'.PHP_EOL, FILE_APPEND);
        }
}