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JWT authentication tutorial

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Title unchanged

JWT authentication tutorial

Category unchanged

Tutorials

Yii version unchanged

2.0

Tags changed

authentication,auth,jwt

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[...]
This token is generated upon login only, and is stored in the table `user_refresh_token`.
A user may have several RefreshToken in the database.


### Scenarios #### User logs in for the first time, via the `/auth/login` endpoint:

In our `actionLogin()` method two things happens, if the credentials are correct:
[...]
The RefreshToken is in your cookies, but can't be read/accessed/tempered with through Javascript (since it is `httpOnly`).

#### Token expired:

After some time, the JWT will eventually expire. Your API have to return `401 - Unauthorized` in this case.
[...]
Your HTTP client must take this new JWT, replace it in `localStorage`, and then cycle through the request queue and replay all failed requests.

#### My laptop got stolen:

If you set up an `/auth/sessions` endpoint, that returns all the current user's RefreshTokens, you can then display
[...]
#### Why do we trust the JWT blindly?

This is by design the purpose of JWT. It is secure enough to be trustable.
[...]
## Implementation Steps

### Prerequisites

* Yii2 installed
[...]
### Step-by-step setup

- Create an ActiveRecord model for the table `user_refresh_tokens`. We'll use the class name `app\models\UserRefreshToken`.
[...]
```php
public function behaviors() {
     $behaviors = parent::behaviors();
 
 
 $behaviors['authenticator'] = [
'class' => \sizeg\jwt\JwtHttpBearerAuth::class,
'except' => [
[...]
'urf_created' => gmdate('Y-m-d H:i:s'),
]);
if (!$userRefreshToken->save();) {
 
throw new \yii\web\ServerErrorHttpException('Failed to save the refresh token: '. $userRefreshToken->getErrorSummary(true));
 
}

// Send the refresh-token to the user in a HttpOnly cookie that Javascript can never read and that's limited by path
Yii::$app->response->cookies->add(new \yii\web\Cookie([
'name' => 'refresh-token',
'value' => $refreshToken,
[...]
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8 followers
Viewed: 163 886 times
Version: 2.0
Category: Tutorials
Tags: auth, authentication, jwt
Written by: Allan Jensen
Last updated by: Allan Jensen
Created on: Jun 7, 2021
Last updated: 3 years ago
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