Laravel (5.7) Authorization

Difference between Authentication and Authorization

Before proceeding further into learning about the authorization process in Laravel, let us understand the difference between authentication and authorization.

In authentication, the system or the web application identifies its users through the credentials they provide. If it finds that the credentials are valid, they are authenticated, or else they are not.

In authorization, the system or the web application checks if the authenticated users can access the resources that they are trying to access or make a request for. In other words, it checks their rights and permissions over the requested resources. If it finds that they can access the resources, it means that they are authorized.

Thus, authentication involves checking the validity of the user credentials, and authorization involves checking the rights and permissions over the resources that an authenticated user has.

Authorization Mechanism in Laravel

Laravel provides a simple mechanism for authorization that contains two primary ways, namely Gates and Policies.

Writing Gates and Policies

Gates are used to determining if a user is authorized to perform a specified action. They are typically defined in App/Providers/AuthServiceProvider.php using Gate facade. Gates are also functions which are declared for performing authorization mechanism.

Policies are declared within an array and are used within classes and methods which use authorization mechanism.

The following lines of code explain to you how to use Gates and Policies for authorizing a user in a Laravel web application. Note that in this example, the boot function is used for authorizing the users.

<?php

namespace App\Providers;

use Illuminate\Contracts\Auth\Access\Gate as GateContract;
use Illuminate\Foundation\Support\Providers\AuthServiceProvider as ServiceProvider;

class AuthServiceProvider extends ServiceProvider{
   /**
      * The policy mappings for the application.
      *
      * @var array
   */
   
   protected $policies = [
      'App\Model' => 'App\Policies\ModelPolicy',
   ];
   
   /**
      * Register any application authentication / authorization services.
      *
      * @param \Illuminate\Contracts\Auth\Access\Gate $gate
      * @return void
   */
   
   public function boot(GateContract $gate) {
      $this->registerPolicies($gate);
      //
   }
}

Previous: Laravel (5.7) Authentication
Next: Laravel (5.7) Encryption