Authentication using Jelly and Jelly-Auth

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Russian version "Аутентификация с использованием Jelly и Jelly-Auth"



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I decide to try Kohana 3 Jelly (by jonathangeiger and banks) and Jelly-Auth (by raeldc) ORM libraries for simple authentication application (consider it as tutorial). Before now I have not used ORM because of possible performance lack, but quick prototyping advantage forced me to make a try. I have to note that in Auth-like autentication some things are not very acceptable for me (e. g. storing user data in sesion), but for my purpose it is not critical.



At the beginning I want to warn that my code has not been security and error tested, so please do not use it without testing in production!


Short specs
  1. restricted access admin area /admin
  2. log in/log out (w/o auto-login)
  3. CRUD users from admin area (no open registration)



Edit application/bootstrap.php
[code lang="php"]

Kohana::modules(array(

    'database'   => MODPATH.'database',   // Database access

'jelly'      => MODPATH.'jelly',

    'jelly-auth' => MODPATH.'jelly-auth',  // this is jelly-auth plug-in

    'auth'       => MODPATH.'auth',       // Basic authentication

    ));

[/code]
ORM and Auth modules should be plugged too, Auth module being plugged after Jelly-Auth as banks have noticed.


Insert admin area route before default one
[code lang="php"]

Route::set('admin', 'admin(/<action>(/<param>(/<id>)))')

    ->defaults(array(

        'controller' => 'admin',

        'action'     => 'index',

    ));

[/code]


Extend Controller_Admin from Controller_Template. At the beginning we'll use only two class properties
[code lang="php"]

public $template;

protected $auth;

[/code]   

and six methods
[code lang="php"]

public function before() (init common controller properties)   

public function action_index() (test page)

public function action_login() (login page)

public function action_users() (user management)

public function action_logout() (logout from admin area)

protected function _auto_nav() (navigation menu auto-generating)

[/code]


Create DB, add DB user and write it in application/config/database.php. And copy modules/jelly-auth/config/auth.php to application/.


Using Jelly-Auth DB schema script to create data structure and add admin user

[code lang="sql"]

INSERT INTO `users` (`id`, `email`, `username`, `password`, `logins`, `last_login`) VALUES (1, '', 'admin', 'a3b34d0f297748b8b5741113d9f1ff925d5d7651331a10e0b8', 0, NULL);

INSERT INTO `roles_users` (`user_id`, `role_id`) VALUES ('1', '1'), ('1', '2');

[/code]

Login 'admin', password 'password'


For the first time I use only 'login' role, ignore 'admin'.

Next build the controller (I will not describe views, all files can be downloaded and examined)


before()
Init every-page-useful stuff
[code lang="php"]

$this->auth = Auth_Jelly::instance();

$this->template->menu = $this->_auto_nav();

$this->template->footer = View::factory('admin/footer');

[/code]

In real-world application a manager of allowed/denied pages in before() method would ease coding. But for story compactness I 'll use check in every method separately.



action_login()
This page is useless for a logged user, check him against 'login' role and redirect if yes. 
[code lang="php"]

if ($this->auth->logged_in('login'))

{

    Request::instance()->redirect('auth/index');

}

[/code]

Notice that I use here Jelly_Auth::logged_in($role = NULL) function for access check, but in other pages-methods Auth::get_user() function to automatically get user data. Auth::get_user() does not check any role, and this should be done manually. So you can see that 'login' role is verified only at login. 


Login is performed after checking $_POST:

[code lang="php"]

if ($_POST)

{

    $username = $_POST['username'];

    $password = $_POST['password'];

           

    // no autologin for the time being

    if ($this->auth->login($username, $password, FALSE))

    {

        Request::instance()->redirect('admin/index');

    } else {

        $errors = array('Login or password incorrect');

    }

}

[/code]


action_index()
Index page is only for demonstration of succesful login. Check whether a visitor is logged in  and redirect him to login page if needed.

[code lang="php"]

>$user = $this->auth->get_user();

if ( ! $user)

{

    Request::instance()->redirect('admin/login');

}

[/code]
this $user object is used for welcome message decoration


action_users($action = NULL, $id = NULL)
This is the "fat" method where we can really touch Jelly ORM. Following cases should be processed here

  1. view list of users (no parameters)
  2. create user ($action = 'add')
  3. edit user profile ($action = 'edit', $id = user ID )
  4. delete user ($action = 'del', $id = user ID)


1) getting users list is simple with Jelly:
[code lang="php"]

$users = Jelly::select('user')->execute();

[/code]
and $users variable contains array of user objects.
User model is described in Jelly-Auth module, and so no additional writing needed (if we want to add some fields, certainly have to extend to our own model)


2) to create user get his data from $_POST (you probably should use Arr::extract(), but I make that in more details for better understanding). Then set User object Jelly::factory('user') fields and save:
[code lang="php"]

Jelly::factory('user')

    ->set(array(

        'username' => $username,

        'password' => $password,

        'password_confirm' => $password_confirm,

        'email' => $email,

        'roles' => Jelly::select('role')

            ->where('name', '=', 'login')

            ->execute(),

        ))

    ->save();

[/code]


Notice that I fill 'roles' field too by getting needed role IDs from roles table by means of Jelly::select().  Examine DB queries:
[code lang="sql"]

SELECT `roles`.`id` AS `id`, `roles`.`name` AS `name`, `roles`.`description` AS `description` FROM `roles` WHERE `roles`.`name` = 'login'

SELECT COUNT(*) AS `total` FROM `users` WHERE `users`.`username` = 'testtt' ORDER BY `users`.`username` ASC

SELECT COUNT(*) AS `total` FROM `users` WHERE `users`.`email` = 'asdf@vxcvxc.com' ORDER BY `users`.`username` ASC

INSERT INTO `users` (`username`, `password`, `email`, `logins`, `last_login`) VALUES ('testtt', 'ffe4126c4f790dbafca44c82a3793f6cea32feef87efe87cc1', 'asdf@vxcvxc.com', 0, NULL)

INSERT INTO `roles_users` (`user_id`, `role_id`) VALUES (5, 1)

[/code]
Two queries with COUNT are because of unique username and email fields (see Model_Auth_User from Jelly-Auth module), but I do dislike COUNT(*) :(

One more thing that I do not like in Jelly-Auth is throwing Validation_Exception at validation error. This is a simple and elegant solution, but what to do with, for example, database exceptions?   


3) to edit user profile I take it from DB by primary key
[code lang="php"]

$user = Jelly::select('user')

    ->load($id);

[/code]


and after $_POST check set new values for needed fields and save object
[code lang="php"]

$user->username = $_POST['username'];

$user->email = $_POST['email'];

                       

if ($_POST['password'])

{

    $user->password = $_POST['password'];

    $user->password_confirm = $_POST['password_confirm'];

}

...

$user->save();

[/code]
Jelly allows updating without preliminary object loading -- by creating "abstract" one with Jelly::factory('user'), setting fields and saving with $user->save($id). But in my example I need original field values, so load object.


4) user deleting is accomplished in two steps. First a confirmation is requested and only after that deleting done. To prevent some simplest cases of CSRF I get ID of user to be deleted via POST (yes, maybe too excessively for now).
[code lang="php"]

if (isset($_POST['ok']))

{

    if (Jelly::factory('user')->delete($_POST['id']))

    {

        $this->template->content = 'User was deleted';

    } else {

        $this->template->content = 'User was not deleted';

    }

} else {

    Request::instance()->redirect('admin/users');

}

[/code]


action_logout()
logout and redirect
[code lang="php"]

$this->auth->logout();

Request::instance()->redirect('admin/login');

[/code]


You can see that basic operations can be coded simply (of course due to Jelly and Jelly-Auth). But this admin area is still very "green" -- weak role system (any user can CRUD any other one), absence of some handy features like auto-login and lack of security. I hope to find some time and make stuff better. Will be grateful for any feedback.

Download 70 (zipped ~6 KiB)

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