PHP Implementation of the GJP proxy. Use it locally (php -S localhost:PORT)

GJP-script.php

<?php

function xorCipher($string, $key) {
    $keyLength = strlen($key);
    $result = '';
    
    for ($i = 0; $i < strlen($string); $i++) {
        $char = $string[$i];
        $keyChar = $key[$i % $keyLength];
        $result .= chr(ord($char) ^ ord($keyChar));
    }

    return $result;
}

function encodeGJP($password) {
    $encoded = xorCipher($password, '37526');
    $encodedBase64 = base64_encode($encoded);
    $modifiedBase64 = str_replace(['+', '/'], ['-', '_'], $encodedBase64);

    return $modifiedBase64;
}

$_SERVER["REQUEST_URI"] = str_replace('/index.php/', "", $_SERVER["REQUEST_URI"]);
$file = file_get_contents("./data.txt");

if(!empty($_POST["accountID"]) && !empty($file)) {
    $_POST["gjp"] = $file; // Gaslight trollface :3
}

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL,"https://gdps.dimisaio.be/database/" . $_SERVER["REQUEST_URI"]);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, http_build_query($_POST));
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

$response = curl_exec($ch);

// Check for errors
if (curl_errno($ch)) {
    exit("-1"); // throw da baby :D
} 

curl_close($ch);

if($_SERVER["REQUEST_URI"] == "accounts/loginGJAccount.php" && !str_starts_with($response, "-")) {
    file_put_contents("./data.txt", encodeGJP($_POST["password"]));
}

echo $response;

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