Null Auth

Null Guard for Laravel. Designed for Middleware-based authentication and testing.

Requirements

• PHP: ^8.0
• Laravel: ^9.0 || ^10.0 || ^11.0

Installing

composer require mpyw/null-auth

Features

NullAuthenticatable family

Trait	ID	Password	Remember Token
GenericNullAuthenticatable GenericStrictNullAuthenticatable	❗️	❌	❌
NullAuthenticatable StrictNullAuthenticatable	✅	❌	❌
NoRememberTokenAuthenticatable StrictNoRememberTokenAuthenticatable	✅	✅	❌

• ❗️shows containing abstract methods.
• Strict traits throw BadMethodCallException on bad method calls.

NullGuard

• NullGuard::user() always returns Authenticatable already set by NullGuard::setUser().
• NullGuard::unsetUser() can unset user.

NullUserProvider

• All methods do nothing and always returns falsy value.

Usage

Basic Usage

Edit your config/auth.php.

<?php

return [

    /* ... */

    /*
    |--------------------------------------------------------------------------
    | Authentication Guards
    |--------------------------------------------------------------------------
    |
    | Next, you may define every authentication guard for your application.
    | Of course, a great default configuration has been defined for you
    | here which uses session storage and the Eloquent user provider.
    |
    | All authentication drivers have a user provider. This defines how the
    | users are actually retrieved out of your database or other storage
    | mechanisms used by this application to persist your user's data.
    |
    | Supported: "session", "token"
    |
    */

    'guards' => [
        'web' => [
            'driver' => 'null', // Use NullGuard for "web"
            'provider' => 'users',
        ],

        'api' => [
            'driver' => 'token',
            'provider' => 'users',
            'hash' => false,
        ],
    ],

    /*
    |--------------------------------------------------------------------------
    | User Providers
    |--------------------------------------------------------------------------
    |
    | All authentication drivers have a user provider. This defines how the
    | users are actually retrieved out of your database or other storage
    | mechanisms used by this application to persist your user's data.
    |
    | If you have multiple user tables or models you may configure multiple
    | sources which represent each model / table. These sources may then
    | be assigned to any extra authentication guards you have defined.
    |
    | Supported: "database", "eloquent"
    |
    */

    'providers' => [
        'users' => [
            'driver' => 'null', // Use NullUserProvider for "users"
        ],
        
        // 'users' => [
        //     'driver' => 'eloquent',
        //     'model' => App\User::class,
        // ],

        // 'users' => [
        //     'driver' => 'database',
        //     'table' => 'users',
        // ],
    ],

    /* ... */
];

Motivation

Guard-based API Authentication

Consider authentication that sends HTTP requests to the external platform.

In such a situation, you will probably use RequestGuard through Auth::viaRequest() call. However, some methods on the contracts UserProvider and Authenticatable are unsuitable for that. They heavily rely on the following flow:

1. Retrieve a user from database by email address
2. Verify user's password hash

This library provides a helper that makes the useless contract methods to do nothing; always return nullish or falsy values.

Now we include NullAuthenticatable trait on a user model.

<?php

namespace App;

use Illuminate\Contracts\Auth\Authenticatable;
use Illuminate\Database\Eloquent\Model;
use Mpyw\NullAuth\NullAuthenticatable;

class User extends Model implements Authenticatable
{
    use NullAuthenticatable;
}

Then only getAuthIdentifierName() and getAuthIdentifier() are provided as a valid implementation.

<?php

$user = User::find(1);

// Minimal implementation for Authenticatable
var_dump($user->getAuthIdentifierName()); // string(2) "id"
var_dump($user->getAuthIdentifier());     // int(1)

// Useless implementation for Authenticatable when we don't use StatefulGuard
var_dump($user->getAuthPassword());       // string(0) ""
var_dump($user->getRememberTokenName());  // string(0) ""
var_dump($user->getRememberToken());      // string(0) ""
$user->setRememberToken('...');           // Does nothing

Middleware-based Authentication

Suppose you hate using RequestGuard and wish implementing authentication on middleware.

Methods such as Auth::user() cause side effects when called for the first time on each request. This may lead to inappropriate behaviors if you concentrate authentication on middleware and use Auth::user() only as a container for Authenticatable object.

Don't worry. This library provides NullGuard, which is exactly as a simple Authenticatable container that you want. Auth::user() does nothing but returning the cached Authenticatable. You can just focus on calling Auth::setUser() on your cool middleware at ease.

<?php

namespace App\Http\Middleware;

use App\User;
use Closure;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Example\API\Authentication\Client;

class AuthenticateThroughExternalAPI
{
    /**
     * @var \Example\API\Authentication\Client
     */
    protected $client;

    /**
     * @param \Example\API\Authentication\Client $client
     */
    public function __construct(Client $client)
    {
        $this->client = $client;
    }

    /**
     * @param \Illuminate\Http\Request $request
     * @param \Closure $next
     * @return mixed
     */
    public function handle(Request $request, Closure $next)
    {
        // Return user_id on success, throw AuthenticationException on failure
        $userId = $this->client->authenticate($request->input('token'));

        // Return User on success, throw ModelNotFoundException on failure
        $user = User::findOrFail($userId);

        Auth::setUser($user);

        return $next($request);
    }
}

Testing

Needless to say, it is also useful for testing. There is no worry about causing side effects.