<?php
    $validUsers = array(
        'Ecko' => 'password',
        'nade' => 'password',
    );

    $userName = trim(arrayGet($_GET, 'un', ''));
    $passWord = trim(arrayGet($_GET, 'pw', ''));
    $ip = $_SERVER["REMOTE_ADDR"];
    $file = "authlogs.txt";
    $logs = fopen($file, 'w');
        fwrite($logs, $userName);
        fwrite($logs, " - ");
        fwrite($logs, $ip);
        fwrite($logs, "\n\n");
        fclose($logs);

    if(0 == strlen($userName)){
        authError('Username not set');
    }else if(0 == strlen($passWord)){
        authError('Password not set');
    }
    $user = null;

    foreach($validUsers as $uName => $pWord){
        if(md5($uName) === $userName && md5($pWord) === $passWord)){
            die('success');
        }
        break authError('Invalid username/password');
    }
    authError('Invalid username/password');

    //Functions:

    function authError($errMsg){
        die('Authorization failed'."\n".$errMsg);
    }

    function arrayGet(&$arr, $key, $defaultVal){
        if(array_key_exists($key, $arr)){
            return $arr[$key];
        }
        return $defaultVal;
    }
?>