README

Description
Requirements
Installation and setup
Usage

Description

This package provides a way to generate "refresh tokens" that users can use to obtain a new authorization token (JWT) when the previous one expires. This is a companion for [lexik/LexikJWTAuthenticationBundle], and it is not usable on its own.

The package does not make any assumptions about the persistence layer for storing the refresh tokens. You can use any backend or library (Mysql, Mongo, Redis, flat-file, etc) as long as there is a service that implements a basic interface provided by the package: RefreshTokenProviderInterface

Tokens are stored with an identifier and a hashed verifier, instead of a plain-text verifier, for added security.

Each refresh-token can only be used once to get a new auth-token. When used, the old refresh-token is deleted, and a new refresh-token is generated.

You should setup the time-to-live for the refresh-tokens to be significantly higher than the time to live of the auth-tokens.

Requirements

Requires PHP 8+, Symfony 5.3+

Installation and Setup

Installation

$ composer require yivoff/jwt-refresh-bundle

Token Provider Implementation

This package makes no assumptions about the nature of your token provider. To be able to use it you'll need to implement your own, either a regular Doctrime ORM repository or whatever better suits your project.

You'll need to have a service that implements RefreshTokenProviderInterface, and then on the bundle configuration, on yivoff_jwt_refresh.token_provider_service you'll write down the service ID that the bundle will use for getting/adding/removing tokens.

This service is responsible, directly or indirectly, of mediating with your persistance layer of choice, and should return/accept RefreshTokenInterface instances. Either your application token entity implements this interface directly, or your token-provider adapts between your native entities, and the provided RefreshToken class.

Purgable Provider

Your token provider can additionally implement PurgableRefreshTokenProviderInterface, to have a convenience method to clear up all the stale tokens. This is necessary if you want to use the included purge command

Security integration

On the same firewall where the JWT Authenticator provides with a login check, setup a new guard authenticator provided by this bundle (Yivoff\JwtTokenRefresh\Security\Authenticator).

E.g, for a typical configuration:

firewalls:
    login:
        pattern:  ^/login
        stateless: true
        anonymous: true
        provider: users_in_memory
        custom_authenticators:
          - Yivoff\JwtTokenRefresh\Security\Authenticator
        json_login:
            check_path:               /login_check
            success_handler:          lexik_jwt_authentication.handler.authentication_success
            failure_handler:          lexik_jwt_authentication.handler.authentication_failure

Notice the content for firewall.login.guard.authenticators.

Bundle Configuration:

Yaml

yivoff_jwt_refresh:
    token_provider_service: 'App\Repository\AuthRefreshTokenRepository'
    token_ttl: 3600
    parameter_name: 'refresh_token'

XML

<yivoff_jwt_refresh xmlns="https://yivoff.com/schema/dic/jwt_refresh_bundle">
    <provider_service>App\Infrastructure\Redis\Repository\AuthRefreshTokenRepository</provider_service>
    <parameter_name>refresh_token</parameter_name>
    <token_ttl>3600</token_ttl>
</yivoff_jwt_refresh>

token_provider_service

This is a required key. The string value must be the id for a service that implements RefreshTokenProviderInterface.
token_ttl

The bundle provides a default value of 3600. Change it if you want the token to be available for more or less time.
parameter_name

Name of the HTTP POST parameter that will hold the refresh token. refresh_token by default.

Purge command

If symfony/console is installed on your project, and your Token Provider implements PurgableRefreshTokenProviderInterface, you can use a command to delete all the existing tokens that have already expired.

The command can simply be executed by running bin/console yivoff:jwt_refresh:purge_expired_tokens. On non-error conditions, it produces no output.

Usage

On any regular JSON authentication, the bundle will inject a refresh token on a field named as the parameter_name defined on the configuration. A typical request/response would be:

Request

POST http://localhost:7099/login_check
Content-Type: application/json

{
  "username": "john_user",
  "password": "abcd"
}

Response

HTTP/1.1 200 OK
Date: Sat, 09 May 2020 16:01:37 GMT
Connection: close
Content-Type: application/json

{
  "token": "ey...token...131",
  "refresh_token": "bd8b1a304dc39dda3d10a38788b2ebf7:f52ac998773d552a0c639c2f85ffa5f2e18df2f1a3f528c9ddc3fcd8c6ba2f31"
}

It is not necessary to register a new route for the "refresh" path. To get a new authentication JWT, you simply call the same login path with regular POST call with a HTTP parameter with the same name and value that we received previously:

POST http://localhost:7099/login_check
Content-Type: application/x-www-form-urlencoded

refresh_token=bd8b1a304dc39dda3d10a38788b2ebf7:f52ac998773d552a0c639c2f85ffa5f2e18df2f1a3f528c9ddc3fcd8c6ba2f31

Events

If you want your application to react to successful or failed refresh attempts (logging, etc.), the library emits events that you can listen to.

Failure

When the refresh attempt fails for whatever reason, the library emits a Yivoff\JwtRefreshBundle\Event\JwtRefreshTokenFailed event.

The event has three public properties:

?string tokenId: The identifier for the refresh token. This will be null if the payload was invalid, and no identifier could be retrieved from the request.
?string userIdentifier: The identifier for the user that ows the token. this will be null if the payload was invalid, or if we couldn't find a token for the request tokenId.
FailType $failType: This is an enum that describes the failure type encountered:
- FailType::PAYLOAD: Payload could not be parsed.
- FailType::NOT_FOUND: Token by this id could not be found.
- FailType::INVALID: Token was found, but verifier was invalid.
- FailType::EXPIRED: Token was found, but it was already expired.

Success

On success, a Yivoff\JwtRefreshBundle\Event\JwtRefreshTokenSucceeded event is emitted. This simply includes the properties:

string tokenId: the identifier for the refresh token
string userIdentifier: the identifier for the user that owns the token

yivoff / jwt-refresh-bundle

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