zf2 get userid logged into the system in the Model - zend-framework2

Question

I am using ZF2
I am want to get the user information who has logged into the system. Basically I am having a create_userid and last_update_userid for every table. I want to populate this with the id of the user who has logged in and performing the operations.
I can pass this as a parameter into my operations from the controller; I would like to get this automatically from the system.
I am sure someone else would have thought about this and performed this.

Answer 1

I did some research and found when a class is created to implement ServiceLocatorAwareInterface we can do all sorts of things with the service locator. Also, the servicelocator is set automatically by the MVC engine.
I created the Table to implement ServiceLocatorAwareInterface and I could get the user id of the logged in user.
I have the code below
namespace UserAdmin\Model;
use Zend\Db\TableGateway\TableGateway;
use Zend\ServiceManager\ServiceLocatorAwareInterface;
use Zend\ServiceManager\ServiceLocatorInterface;
class UserTable implements ServiceLocatorAwareInterface {
protected $serviceLocator = null;
protected $loggedUser = 0;
protected $tableGateway;
protected $table = "user";
public function __construct( TableGateway $tableGateway ) {
$this->tableGateway = $tableGateway;
}
public function setServiceLocator(ServiceLocatorInterface $serviceLocator) {
$this->serviceLocator = $serviceLocator;
}
public function getServiceLocator() {
return $this->serviceLocator;
}
protected function setLoggedUser( ) {
$serviceLocator = $this->getServiceLocator( );
$authService = $serviceLocator->get( 'AuthService' );
if ( $authService->hasIdentity( ) ) {
$this->loggedUser = $authService->getIdentity( )->user_id;
}
}
...
...
public function saveUser ( User $user ) {
if ( $this->loggedUser == 0 ) {
$this->setLoggedUser( );
}
...
...
$data [ 'last_update_userid' ] = $this->loggedUser;
$data [ 'last_update_timestamp' ] = date ( 'Y-m-d H:i:s' );
if ( is_null( $user_id ) ) {
$data [ 'create_userid' ] = $this->loggedUser;
$data [ 'create_timestamp' ] = date ( 'Y-m-d H:i:s' );
$this->tableGateway->insert( $data );
} else {
if ( $this->getUser ( $user_id ) ) {
$this->tableGateway->update( $data, array ( 'user_id' => $user_id, ) );
} else {
throw new \Exception ( "Could not find row in table $this->table for update" );
}
}
}
}
This takes care of most of my needs. There is just two aspects.
a> I tried calling the setLoggedUser function from the constructor and it does not work. I think the service locator is set after the entire construction. so I am calling the function just before a save, and that is when I need it. Is this a clean implementation or is there another way to do this.
b> An User can register himself on the site; and the userid is an autogenerated sequence so how do I populate the userid to be the same as the new userid.
Two things come to my mind;
1> After insert read the user record and update the record with the userid
2> Not worry about this so much and have a system superadmin id as the id to write users who self register.
This is a problem only for self registrations of users only. Any other table within the system will be inserted or updated only after the user is logged in.

Answer 2

To set the Service Locator in the UserTable Class -
In UserAdmin/Module.php -
'UserAdmin\Model\UserTable' => function($sm) {
$tableGateway = $sm->get('UserTableGateway');
$table = new UserTable($tableGateway);
//This way the serviceLocator is injected to the Table.
$table->setServiceLocator($sm);
return $table;
},
Now, when you will call the setLoggedUser from the controller, the value will be set.
Important:
Rather than having the above private function, the best approach will be to have a Controller Plugin. This plugin will check if any user is logged in or not and if yes then return the user's id.