Authorization

Authorization is the process by which a system takes a validated identity and checks if that identity has access to a given resource.

DotKernel API's implementation of authorization uses Mezzio\Authorization\Rbac\LaminasRbac as a model of Role-Based Access Control (RBAC).

How it works

In DotKernel API each authenticatable entity (admin/user) comes with their roles table where you can define roles for each entity. RBAC comes in to ensure that each entity has the appropriate role and permission to access a resource.

The authorization happens through the Api\App\Middleware\AuthorizationMiddleware middleware.

Configuration

DotKernel API makes use of mezzio-authorization-rbac and includes the full configuration.

The configuration file for the role and permission definitions is config/autoload/authorization.global.php.

'mezzio-authorization-rbac' => [
    'roles'       => [
        AdminRole::ROLE_SUPERUSER => [],
        AdminRole::ROLE_ADMIN     => [
            AdminRole::ROLE_SUPERUSER,
        ],
        UserRole::ROLE_GUEST      => [
            UserRole::ROLE_USER,
        ],
    ],
    'permissions' => [
        AdminRole::ROLE_SUPERUSER => [],
        AdminRole::ROLE_ADMIN     => [
            'other.routes'
            'admin.list',
            'home'
        ],
        UserRole::ROLE_USER       => [
            'other.routes',
            'user.my-account.update',
            'user.my-account.view',
        ],
        UserRole::ROLE_GUEST      => [
            'other.routes',
            'security.refresh-token',
            'error.report',
            'home',
        ],
    ],
],

See mezzio-authorization-rbac for more information.

Usage

Based on the configuration file above, we have 2 admins roles (superuser, admin) and 2 users roles (user, guest).

Roles inherit the permissions from their parents:

• superuser has no parent
• admin has superuser as a parent which means superuser also has admin permissions
• user has no parent
• guest has user as a parent which means user also has guest permissions

For each role we defined an array of permissions. A permission in DotKernel API is basically a route name.

As you can see, the superuser does not have its own permissions, because it gains all the permissions from admin, no need to define explicit permissions.

The user role, gains all the permission from guest so no need to define that user can access home route, but guest cannot access user-specific routes.