How Can I Effectively Implement Access Control Lists (ACLs) in My Web MVC Application?

Implementing Access Control Lists in Web MVC Applications

The implementation of Access Control Lists (ACLs) ensures that users are authorized to perform specific actions within an application. Here's a thorough approach to this task:

Implementing ACLs

The most effective method involves utilizing the decorator pattern. This involves wrapping the target object within another object acting as a protective layer, without extending the original class. Here's an example:

class SecureContainer
{
    protected $target;
    protected $acl;

    public function __construct($target, $acl)
    {
        $this->target = $target;
        $this->acl = $acl;
    }

    public function __call($method, $arguments)
    {
        if (
            method_exists($this->target, $method)
            && $this->acl->isAllowed(get_class($this->target), $method)
        ) {
            return call_user_func_array(array($this->target, $method), $arguments);
        }
    }
}

Advantages:

• Can be applied to any object, not just controllers.
• Authorization checks occur outside the target object, promoting separation of concerns.
• Secured instances can be injected into other objects, retaining protection.

Role-Based Access Control (RBAC) for Objects

To implement RBAC for objects, you need to account for the fact that domain objects contain owner details. Modify the isAllowed method:

$this->acl->isAllowed($this->target->getPermissions(), $command);

Side Notes

• Correctly define models in MVC: models are not classes but a layer containing classes responsible for business logic and data access.
• Services are abstraction layers used within controllers, which simplify complex operations involving domain objects and mappers. Services do not impact the View layer directly and are autonomous, facilitating migrations to different frameworks.

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