Lumen configuration of JWT authentication

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Following up our previous post Getting started with Lumen 7.0.x and JWT authentication, we will present how to properly configure the authentication package we installed. Most of this tutorial also applies in Laravel framework as long as Lumen is a minimal implementation of it. For this tutorial we will recap some parts.

First of all we need the following two packages to be installed via composer:

composer require chuckrincon/lumen-config-discover
composer require tymon/jwt-auth:dev-develop

The first package basically allow us to have a config folder where all the configuration files can reside and load automatically. The second one is the JWT authentication package which can be easily implemented by following the tutorial Getting started with Lumen 7.0.x and JWT authentication.

Now we need to create the folder /config and add the following jwt.php file. The current implementation generates a permanent token (no expiration) for the users, however you can also alter the file according to your needs

<?php

/*
 * This file is part of jwt-auth.
 *
 * (c) Sean Tymon <tymon148@gmail.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

return [

    /*
    |--------------------------------------------------------------------------
    | JWT Authentication Secret
    |--------------------------------------------------------------------------
    |
    | Don't forget to set this in your .env file, as it will be used to sign
    | your tokens. A helper command is provided for this:
    | `php artisan jwt:secret`
    |
    | Note: This will be used for Symmetric algorithms only (HMAC),
    | since RSA and ECDSA use a private/public key combo (See below).
    |
    */

    'secret' => env('JWT_SECRET'),

    /*
    |--------------------------------------------------------------------------
    | JWT Authentication Keys
    |--------------------------------------------------------------------------
    |
    | The algorithm you are using, will determine whether your tokens are
    | signed with a random string (defined in `JWT_SECRET`) or using the
    | following public & private keys.
    |
    | Symmetric Algorithms:
    | HS256, HS384 & HS512 will use `JWT_SECRET`.
    |
    | Asymmetric Algorithms:
    | RS256, RS384 & RS512 / ES256, ES384 & ES512 will use the keys below.
    |
    */

    /*
    |--------------------------------------------------------------------------
    | JWT time to live
    |--------------------------------------------------------------------------
    |
    | Specify the length of time (in minutes) that the token will be valid for.
    | Defaults to 1 hour.
    |
    | You can also set this to null, to yield a never expiring token.
    | Some people may want this behaviour for e.g. a mobile app.
    | This is not particularly recommended, so make sure you have appropriate
    | systems in place to revoke the token if necessary.
    | Notice: If you set this to null you should remove 'exp' element from 'required_claims' list.
    |
    */

    'ttl' => env('JWT_TTL', null),

    /*
    |--------------------------------------------------------------------------
    | Refresh time to live
    |--------------------------------------------------------------------------
    |
    | Specify the length of time (in minutes) that the token can be refreshed
    | within. I.E. The user can refresh their token within a 2 week window of
    | the original token being created until they must re-authenticate.
    | Defaults to 2 weeks.
    |
    | You can also set this to null, to yield an infinite refresh time.
    | Some may want this instead of never expiring tokens for e.g. a mobile app.
    | This is not particularly recommended, so make sure you have appropriate
    | systems in place to revoke the token if necessary.
    |
    */

    'refresh_ttl' => env('JWT_REFRESH_TTL', null),

    /*
    |--------------------------------------------------------------------------
    | JWT hashing algorithm
    |--------------------------------------------------------------------------
    |
    | Specify the hashing algorithm that will be used to sign the token.
    |
    | See here: https://github.com/namshi/jose/tree/master/src/Namshi/JOSE/Signer/OpenSSL
    | for possible values.
    |
    */

    'algo' => env('JWT_ALGO', 'HS256'),

    /*
    |--------------------------------------------------------------------------
    | Required Claims
    |--------------------------------------------------------------------------
    |
    | Specify the required claims that must exist in any token.
    | A TokenInvalidException will be thrown if any of these claims are not
    | present in the payload.
    |
    */

    'required_claims' => [
        'iss',
        'iat',
        'nbf',
        'sub',
        'jti',
    ],

    /*
    |--------------------------------------------------------------------------
    | Persistent Claims
    |--------------------------------------------------------------------------
    |
    | Specify the claim keys to be persisted when refreshing a token.
    | `sub` and `iat` will automatically be persisted, in
    | addition to the these claims.
    |
    | Note: If a claim does not exist then it will be ignored.
    |
    */

    'persistent_claims' => [
        // 'foo',
        // 'bar',
    ],

    /*
    |--------------------------------------------------------------------------
    | Lock Subject
    |--------------------------------------------------------------------------
    |
    | This will determine whether a `prv` claim is automatically added to
    | the token. The purpose of this is to ensure that if you have multiple
    | authentication models e.g. `App\User` & `App\OtherPerson`, then we
    | should prevent one authentication request from impersonating another,
    | if 2 tokens happen to have the same id across the 2 different models.
    |
    | Under specific circumstances, you may want to disable this behaviour
    | e.g. if you only have one authentication model, then you would save
    | a little on token size.
    |
    */

    'lock_subject' => true,

    /*
    |--------------------------------------------------------------------------
    | Leeway
    |--------------------------------------------------------------------------
    |
    | This property gives the jwt timestamp claims some "leeway".
    | Meaning that if you have any unavoidable slight clock skew on
    | any of your servers then this will afford you some level of cushioning.
    |
    | This applies to the claims `iat`, `nbf` and `exp`.
    |
    | Specify in seconds - only if you know you need it.
    |
    */

    'leeway' => env('JWT_LEEWAY', 0),

    /*
    |--------------------------------------------------------------------------
    | Blacklist Enabled
    |--------------------------------------------------------------------------
    |
    | In order to invalidate tokens, you must have the blacklist enabled.
    | If you do not want or need this functionality, then set this to false.
    |
    */

    'blacklist_enabled' => env('JWT_BLACKLIST_ENABLED', true),

    /*
    | -------------------------------------------------------------------------
    | Blacklist Grace Period
    | -------------------------------------------------------------------------
    |
    | When multiple concurrent requests are made with the same JWT,
    | it is possible that some of them fail, due to token regeneration
    | on every request.
    |
    | Set grace period in seconds to prevent parallel request failure.
    |
    */

    'blacklist_grace_period' => 120,

    /*
    |--------------------------------------------------------------------------
    | Cookies encryption
    |--------------------------------------------------------------------------
    |
    | By default Laravel encrypt cookies for security reason.
    | If you decide to not decrypt cookies, you will have to configure Laravel
    | to not encrypt your cookie token by adding its name into the $except
    | array available in the middleware "EncryptCookies" provided by Laravel.
    | see https://laravel.com/docs/master/responses#cookies-and-encryption
    | for details.
    |
    | Set it to true if you want to decrypt cookies.
    |
    */

    'decrypt_cookies' => false,

    /*
    |--------------------------------------------------------------------------
    | Providers
    |--------------------------------------------------------------------------
    |
    | Specify the various providers used throughout the package.
    |
    */

    'providers' => [

        /*
        |--------------------------------------------------------------------------
        | JWT Provider
        |--------------------------------------------------------------------------
        |
        | Specify the provider that is used to create and decode the tokens.
        |
        */

        'jwt' => Tymon\JWTAuth\Providers\JWT\Lcobucci::class,

        /*
        |--------------------------------------------------------------------------
        | Authentication Provider
        |--------------------------------------------------------------------------
        |
        | Specify the provider that is used to authenticate users.
        |
        */

        'auth' => Tymon\JWTAuth\Providers\Auth\Illuminate::class,

        /*
        |--------------------------------------------------------------------------
        | Storage Provider
        |--------------------------------------------------------------------------
        |
        | Specify the provider that is used to store tokens in the blacklist.
        |
        */

        'storage' => Tymon\JWTAuth\Providers\Storage\Illuminate::class,

    ],

];

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