README

Laravel JWT Tools

This package wraps the excellent lcobucci/jwt library with the following benefits:

JWT facade with helper methods to quickly generate and parse tokens.
Enforces a minimal set of claims for generated tokens, like aud, iss, and exp.
Validate parsed tokens to ensure our required claims are set properly with signature present and valid.
HTTP Middleware to validate a route-specific JWT
Request macro to easily access route-specific JWT claims

Quickstart

Installation

composer require stechstudio/laravel-jwt

Simple example

You can generate a simple JWT with the get method.

$jwt = JWT::get('token-id', ['myclaim' => 'somevalue']);

This will generate a token with the ID provided and an array of claims, returning the string token.

Lifetime

The default token expiration is set to 10 minutes which you can configure, or you can specify a custom lifetime value as a third parameter when creating the token:

$jwt = JWT::get('token-id', ['anything' => 'here'], 3600);

This token will expire in one hour. You can also specify the lifetime with Carbon:

$jwt = JWT::get('token-id', ['anything' => 'here'], now()->addMinutes(60));

Signing key

If you are generating a JWT that will be consumed by a different app (very common use case in our company) you can specify the signing key as the fourth parameter.

$jwt = JWT::get('token-id', ['anything' => 'here'], 3600, config('services.otherapp.key'));

Configuration

This package tries to pick sane defaults, while also allowing you to change configs through your .env file.

Signature key

Every token is signed. The JWT_SIGNING_KEY value is used is available, otherwise APP_KEY will be used as the signing key.

Lifetime

Default lifetime is 600 seconds / 10 minutes. You can change the default by specifying the number of seconds as JWT_LIFETIME.

Issuer

The default token issuer (iss claim) is your APP_NAME lowercase. You can specify a different issuer name via JWT_ISSUER.

Audience

The default token audience (aud claim) is your APP_NAME lowercase. You can specify a different audience name via JWT_AUDIENCE.

Building tokens fluently

So far we've looked at the JWT::get() helper method which is super quick for simple needs.

For more control over your token you can create it fluently instead.

You can use any of the methods provided by the underlying Builder class, along with a few new ones like signWith and lifetime.

$token = JWT::setId('my-token-id')
   ->lifetime(3600)
   ->signWith('custom-signing-key-with-256-bits')
   ->issuedBy("my-app")
   ->permittedFor("receiving-app")
   ->withClaim('myclaim', 'any value')
   ->getToken()
   ->toString();

Parsing

You can parse a JWT string into a token:

$token = JWT::parse("... JWT string ...");

An exception will be thrown if the JWT cannot be parsed.

Validate received tokens

Just as this package has opinions on what a generated token should include, we want to ensure those minimums are set appropriately on any received tokens.

After parsing a received token, simply call isValid or validate, depending on whether you want a boolean result or exceptions thrown. Make sure to pass in the expected token ID.

$token = JWT::parse("... JWT string ...");

$token->isValid('expected-token-id'); // Returns true or false

$token->validate('expected-token-id'); // Throws exceptions for any validation failure

At this point you can be certain that the token:

Is signed, and the signature is verified (using the configured signature key)
Is within the permitted timeframe (has not expired)
Is intended for your app (aud claim matches the configured audience)
Has the expected ID

Validation exceptions

When calling validate('expected-token-id') the following exceptions will be thrown depending on the validation failure:

STS\JWT\Exceptions\InvalidSignature
STS\JWT\Exceptions\TokenExpired
STS\JWT\Exceptions\InvalidAudience
STS\JWT\Exceptions\InvalidID
STS\JWT\Exceptions\ValidationException will be used for any other types of validation failures.

Retrieving claims

Once you've parsed and validated a token, you can retrieve all token claims with getClaims or simply toArray.

If you'd like to just retrieve your custom payload claims, use getPayload;

// Make our string token
$jwt = JWT::get('token-id', ['foo' => 'bar']);

// Parse it and validate
$token = JWT::parse($jwt)->validate('token-id');

// Ignore registered claims, just get our custom claims
$token->getPayload(); // [ foo => bar ]

Or to retrieve just one claim, use get passing in the name of the claim. You can optionally pass in a default value as the second parameter;

$token->get("foo"); // bar

$token->get("invalid"); // null

$token->get("invalid", "quz"); // quz

Route middleware

We frequently use JWTs to authorize a request. These are sometimes generated and consumed by the same app, but more frequently they are for cross-app authorization.

You can use the included jwt middleware to validate a JWT request. The middleware will look for the JWT in a number of places:

As a request parameter named jwt or token
As a route paramater named jwt or token
In the Authorization header either as Token JWT or Bearer :base64encodedJWT

If a token is found in any of these locations it will be parsed and validated.

Token ID

By default, the token ID will be expected to match the route name.

For example, with this following route the token will need an ID of my.home:

Route::get('/home', [Controller::class, 'home'])->name('my.home')->middleware('jwt');

You can specify the required ID by passing it as a middleware parameter:

Route::get('/home', [Controller::class, 'home'])->middleware('jwt:expected-id');

Access claims on request

All token claims

The Laravel Request has a getClaim macro on it, so you can grab claims from anywhere.

Example when injecting $request into a controller method:

use Illuminate\Http\Request;

class Controller {
    public function home(Request $request)
    {
        echo $request->getClaim('aud'); // The token audience    
    }
}

Custom payload merged

The token payload (custom claims added to the JWT, not part of the core registered claim set) is merged onto the request attributes, so you can access these just like any other request attribute.

If the JWT has a foo claim, you can directly access $request->foo or $request->input('foo') or even request('foo') using the global request helper.

Note: When the payload is merged onto the request, there is a chance that we are stomping on some existing request attributes. Because we really trust the payload in a validated JWT, we prefer this behavior. However if you want to disable set JWT_MERGE_PAYLOAD=false in your .env file.

stechstudio / laravel-jwt

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