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<?php
namespace Jasny;
use Jasny\Auth\User;
use Jasny\Auth\Middleware;
/**
* Authentication and access control
*
* <code>
* class Auth extends Jasny\Auth
* {
* use Jasny\Auth\ByLevel;
* use Jasny\Auth\Sessions;
*
* protected $levels = [
* 'user' => 1,
* 'admin' => 10
* ];
*
* public function fetchUserById($id)
* {
* ...
* }
*
* public function fetchUserByUsername($username)
* {
* ...
* }
* }
* </code>
*/
abstract class Auth
{
/**
* Current authenticated user
* @var User|false
*/
protected $user;
/**
* Persist the current user id across requests
*
* @return void
*/
abstract protected function persistCurrentUser();
/**
* Get current authenticated user id
*
* @return mixed
*/
abstract protected function getCurrentUserId();
/**
* Fetch a user by ID
*
* @param int|string $id
* @return User|null
*/
abstract public function fetchUserById($id);
/**
* Fetch a user by username
*
* @param string $username
* @return User|null
*/
abstract public function fetchUserByUsername($username);
/**
* Get current authenticated user
*
* @return User|null
*/
public function user()
{
if (!isset($this->user)) {
$uid = $this->getCurrentUserId();
$this->user = $uid ? ($this->fetchUserById($uid) ?: false) : false;
}
return $this->user ?: null;
}
/**
* Set the current user
*
* @param User $user
* @return User|null
*/
public function setUser(User $user)
{
if ($user->onLogin() === false) {
return null;
}
$this->user = $user;
$this->persistCurrentUser();
return $this->user;
}
/**
* Hash a password
*
* @param string $password
* @return string
*/
public function hashPassword($password)
{
if (!is_string($password) || $password === '') {
throw new \InvalidArgumentException("Password should be a (non-empty) string");
}
return password_hash($password, PASSWORD_BCRYPT);
}
/**
* Fetch user and verify credentials.
*
* @param User|null $user
* @param string $password
* @return boolean
*/
public function verifyCredentials($user, $password)
{
return isset($user) && password_verify($password, $user->getHashedPassword());
}
/**
* Login with username and password
*
* @param string $username
* @param string $password
* @return User|null
*/
public function login($username, $password)
{
$user = $this->fetchUserByUsername($username);
if (!isset($user) || !$this->verifyCredentials($user, $password)) {
return null;
}
return $this->setUser($user);
}
/**
* Logout
*/
public function logout()
{
$user = $this->user();
if (!$user) {
return;
}
$user->onLogout();
$this->user = false;
$this->persistCurrentUser();
}
/**
* Create auth middleware interface for access control.
*
* @param callable $getRequiredRole
* @return Middleware
*/
public function asMiddleware($getRequiredRole)
{
return new Middleware($this, $getRequiredRole);
}
}
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