<?php

// Survey class as intermediate for storing data from the site to the RDF database 
require_once 'rdfConstants.php';

// Include RAP Library to write RDF files
include(RDFAPI_INCLUDE_DIR . "RDFAPI.php");

class UserDatabaseInterface
{
    protected $key = 'CPSsecretKey';

    protected $userRDFWriter;
    protected $userRDFReader;

    public function __construct()
    {
        $this->userRDFWriter = new UserRDFWriter();
        $this->userRDFReader = new UserRDFReader();
    }

    public function addNewUser($userInfo)
    {
        $userName = $userInfo['username'];
        $userPassword = $this->RIJNDAEL_encrypt($userInfo['password']);

        if(!$this->checkUserName($userName))
        {
            $this->userRDFWriter->addNewUser($userName, $userPassword);
            $this->userRDFWriter->saveUsers();            
        }
    }

    public function checkUserName($userName)
    {
        $result = false;

        $resultUser = $this->userRDFReader->getUserNames();

        if ($resultUser != null)
        {
            foreach($resultUser as $user)
            {
                $name = $user['?name']->label;
                if(!strcmp($name ,$userName))
                {
                    $result = true;
                }
            }
        }

        return $result;
    }

    public function checkUserPassword($userInfo)
    {
        $result = false;

        $userName = $userInfo['username'];
        $userPassword = $userInfo['password'];

        $encryptedPasswordLiteral = $this->userRDFReader->getUserPassword($userName);
        $encryptedPassword = $encryptedPasswordLiteral[0]['?password']->label;

        if(!strcmp($this->RIJNDAEL_encrypt($userPassword),$encryptedPassword))
            $result = true;

        return $result;
    }

    protected function RIJNDAEL_encrypt($text)
    {
        $iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
        $iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);

        return base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->key, $text, MCRYPT_MODE_ECB, $iv)); 
    }
}

?>