Nette authenticator

Authenticator.php

<?php

use Nette\Object,
    Nette\Security as NS;

/**
 * Users authenticator.
 */
class Authenticator extends Object implements NS\IAuthenticator {

    /** @var Nette\Database\Table\Selection */
    private $users;

    public function __construct(Nette\Database\Table\Selection $users) {
        $this->users = $users;
    }

    /**
     * Performs an authentication
     * @param  array
     * @return IIdentity
     * @throws AuthenticationException
     */
    public function authenticate(array $credentials) {
        list($username, $password) = $credentials;
        $row = $this->users->where('username', $username)->fetch();

        if (!$row) {
            throw new NS\AuthenticationException("Uživatel '$username' nebyl nalezen.", self::IDENTITY_NOT_FOUND);
        }

        if ($row->password !== $this->calculateHash($password)) {
            throw new NS\AuthenticationException("Špatné heslo.", self::INVALID_CREDENTIAL);
        }

        unset($row->password);
        return new NS\Identity($row->id, NULL, $row->toArray());
    }

    /**
     * Computes salted password hash.
     * @param  string
     * @return string
     */
    public function calculateHash($password) {
        return md5($password . str_repeat('*random salt*', 10));
    }

}

config.neon

	services:
		authenticator: 
			class: UsersModel
			arguments: ["@database"]

		robotLoader:
			run: true

		database:
			class: Nette\Database\Connection
			arguments: [sqlite2:%appDir%/models/demo.db] # nebo ['mysql:host=localhost;dbname=test', root, root]

		modelLoader:
                    # do tejto statickej metody Nette vzdy preda DI\Container
			class: ModelLoader
			arguments: ["@database"]

usersmodel.php

<?php

use Nette\Object;

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 * Description of UsersModel
 *
 * @author droid
 */
class UsersModel extends Object {

    /** @var Nette\Database\Connection */
    public $database;

    public function __construct($connection) {
        $this->database = $connection;
    }

    public function getAuthenticatorService() {
        return new Authenticator($this->database->table('users'));
    }
}