JWT Tools to Yii Framework 2

JWT Tools is a toolbox that will help you to configure authentication with JWT token. Not only authentication but also signature validation, the famous secret key.

My biggest motivation to do this was because I didn't see a easy way to setup a simple JWT Validation with some helper functions. I always needed copy and past whole the code to a new project.

Follow the steps below to install and setup in your project.

Installation

The preferred way to install this extension is through composer.

To install, either run:

$ php composer.phar require dersonsena/yii2-jwt-tools

or add

"dersonsena/yii2-jwt-tools": "^1.0"

to the require section of your composer.json file.

Usage

Configuration File

Let's guarantee somes application settings are correct. Open your config/web.php and setup such as:

'components' => [
    // ...
    'request' => [
        'enableCookieValidation' => false,
    ],
    'user' => [
        'identityClass' => 'app\models\User',
        'enableAutoLogin' => false,
        'enableSession' => false,
        'loginUrl' => null
    ],
    // ...

Controller

In your controller class, register the JWTSignatureBehavior and HttpBearerAuth behaviors in behaviors() method, such as below:

use yii\rest\Controller;

class YourCuteController extends Controller
{
    public function behaviors()
    {
        $behaviors = parent::behaviors();

        $behaviors['jwtValidator'] = [
            'class' => JWTSignatureBehavior::class,
            'secretKey' => Yii::$app->params['jwt']['secret'],
            'except' => ['login'] // it's doesn't run in login action
        ];

        $behaviors['authenticator'] = [
            'class' => HttpBearerAuth::class,
            'except' => ['login'] // it's doesn't run in login action
        ];

        return $behaviors;
    }
}

NOTE: in this examples I used Yii::$app->params['jwt']['secret'] to store my JWT Secret Key, but, I like a lot of the .env files and this information could be stored there

The JWTSignatureBehavior will validate the JWT token sent by Authorization HTTP Header. If there are some problem with your token this one it will throw one of Exceptions below:

• UnauthorizedHttpException with message Your request was made without an authorization token. if HTTP Header doesn't exist or token is empty or null.

• UnauthorizedHttpException with message Authentication token is expired. if token is out of due.

• UnauthorizedHttpException with message The token signature is invalid. if the token signature is invalid.

If for some reason you need to change the HTTP Header name (to be honest I can't see this scenario) you can change this one setting up the headerName property, such as below:

class YourCuteController extends Controller
{
    // ...
    public function behaviors()
    {
        $behaviors['jwtValidator'] = [
            'class' => JWTSignatureBehavior::class,
            'secretKey' => Yii::$app->params['jwt']['secret'],
            'headerName' => 'Auth'
        ];
    }
    // ...
}

In your login action you need to create a JWT Token to send your response. It's very easy create a token, see below:

class YourCuteController extends Controller
{
    // ...
    public function behaviors()
    {
        $behaviors['jwtValidator'] = [
            'class' => JWTSignatureBehavior::class,
            'secretKey' => Yii::$app->params['jwt']['secret'],
            'headerName' => 'Auth'
        ];
    }

    public function actionLogin()
    {
        // validation stuff
        // find user

        $token = JWTTools::build(Yii::$app->params['jwt']['secret'])
            ->withModel($user, ['name', 'email', 'group'])
            ->getJWT();

        return ['success' => true, 'token' => $token];
    }
    // ...
}

Model Identity Class

At this point we know that the token is valid and we can decode this one to authenticate user.

I'm using here app/models/User as my User Identity, so, let's implement the findIdentityByAccessToken() method of the IdentityInterface interface:

namespace app\models;

use yii\db\ActiveRecord;
use yii\web\IdentityInterface;

class User extends ActiveRecord implements IdentityInterface
{
    // ...
    public static function findIdentity($id)
    {
        return static::findOne($id);
    }

    public function getId()
    {
        return $this->id;
    }

    public function getAuthKey()
    {
        // we don't need to implement this method
    }

    public function validateAuthKey($authKey)
    {
        // we don't need to implement this method
    }

    public static function findIdentityByAccessToken($token, $type = null)
    {
        $decodedToken = JWTTools::build(Yii::$app->params['jwt']['secret'])
            ->decodeToken($token);

        return static::findOne(['id' => $decodedToken->sub]);
    }
}

If all ok, at this point you're able to authenticate with a valid JWT Token.

Demos

Generating a token

You can use the JWTTools methods to make specific things in your project. See some examples below:

use AstrotechLabs\JWTTools\JWTTools;

$jwtTools = JWTTools::build('my-secret-key');

$token = $jwtTools->getJWT();
$payload = $jwtTools->getPayload()->getData();

var_dump($token);
print_r($payload);

This code will be return something like:

string(248) "eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiIsImtpZCI6ImJlMTgzOTQ4YjJmNjkzZSJ9.eyJzdWIiOiJiZTE4Mzk0OGIyZjY5M2UiLCJpc3MiOiIiLCJhdWQiOiIiLCJpYXQiOjE1ODkxMzEzNjIsImV4cCI6MTU4OTEzNDk2MiwianRpIjoiNTM4NTRiMGQ5MzFkMGVkIn0.-JDBkID1oJ7anC_JLg68AJxbKGK-5ubA83zZlDZYYso"

Array
(
    [sub] => 9c65241853de774
    [iss] =>
    [aud] =>
    [iat] => 1589129672
    [exp] => 1589133272
    [jti] => a0a98e2364d2721
)

NOTE: the ->getPayload() returns an instance of the JWTPayload.

Generating Token with an Active Record

You can insert the active record attributes in your payload using withModel() method, like this:

use AstrotechLabs\JWTTools\JWTTools;

$user = app\models\User::findOne(2);

$payload = JWTTools::build('my-secret-key');
    ->withModel($user, ['id', 'name', 'email'])
    ->getPayload()
    ->getData();

print_r($payload);

This code will be return something like:

Array
(
    [sub] => 10                   <~~~~
    [iss] =>
    [aud] =>
    [iat] => 1589130028
    [exp] => 1589133628
    [jti] => 7aba5b7666d7868
    [id] => 10                    <~~~~
    [name] => Kilderson Sena      <~~~~
    [email] => email@email.com.br <~~~~
)

The sub property is automatically override to $model->getPrimaryKey() value, following the RFC7519 instructions.

Changing JWT Properties

You can change the JWT Properties (such as iss, aud etc) adding an array in second method parameter, as below:

use AstrotechLabs\JWTTools\JWTTools;

$payload = JWTTools::build('my-secret-key', [
    'algorithm' => 'ES256',
    'expiration' => 1589069866,  //<~~ It will generate the exp property automatically
    'iss' => 'yourdomain.com',
    'aud' => 'yourdomain.com',
]);

Authors

• Kilderson Sena - Initial work - Yii Academy

See also the list of contributors who participated in this project.

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

Please make sure to update tests as appropriate.

Licence

This package is released under the MIT License. See the bundled LICENSE for details.