Validating tokens

To validate a token you must create a new validator and assert or validate a token.

Using Lcobucci\JWT\Validator#assert()

This method goes through every single constraint in the set, groups all the violations, and throws an exception with the grouped violations:

<?php
declare(strict_types=1);

use Lcobucci\JWT\Encoding\JoseEncoder;
use Lcobucci\JWT\Token\Parser;
use Lcobucci\JWT\Validation\Constraint\RelatedTo;
use Lcobucci\JWT\Validation\RequiredConstraintsViolated;
use Lcobucci\JWT\Validation\Validator;

require 'vendor/autoload.php';

$parser = new Parser(new JoseEncoder());

$token = $parser->parse(
    'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.'
    . 'eyJzdWIiOiIxMjM0NTY3ODkwIn0.'
    . '2gSBz9EOsQRN9I-3iSxJoFt7NtgV6Rm0IL6a8CAwl3Q'
);

$validator = new Validator();

try {
    $validator->assert($token, new RelatedTo('1234567891')); // doesn't throw na exception
    $validator->assert($token, new RelatedTo('1234567890'));
} catch (RequiredConstraintsViolated $e) {
    // list of constraints violation exceptions:
    var_dump($e->violations());
}

Using Lcobucci\JWT\Validator#validate()

The difference here is that we'll always get a boolean result and stop in the very first violation:

<?php
declare(strict_types=1);

use Lcobucci\JWT\Encoding\JoseEncoder;
use Lcobucci\JWT\Token\Parser;
use Lcobucci\JWT\Validation\Constraint\RelatedTo;
use Lcobucci\JWT\Validation\Validator;

require 'vendor/autoload.php';

$parser = new Parser(new JoseEncoder());

$token = $parser->parse(
    'eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.'
    . 'eyJzdWIiOiIxMjM0NTY3ODkwIn0.'
    . '2gSBz9EOsQRN9I-3iSxJoFt7NtgV6Rm0IL6a8CAwl3Q'
);

$validator = new Validator();

if (! $validator->validate($token, new RelatedTo('1234567891'))) {
    echo 'Invalid token (1)!', PHP_EOL; // will print this
}

if (! $validator->validate($token, new RelatedTo('1234567890'))) {
    echo 'Invalid token (2)!', PHP_EOL; // will not print this
}

Note

Some systems make use of components to handle dependency injection. If your application follows that practice, using a configuration object might simplify the wiring of this library.

Available constraints

This library provides the following constraints:

  • Lcobucci\JWT\Validation\Constraint\IdentifiedBy: verifies if the claim jti matches the expected value
  • Lcobucci\JWT\Validation\Constraint\IssuedBy: verifies if the claim iss is listed as expected values
  • Lcobucci\JWT\Validation\Constraint\PermittedFor: verifies if the claim aud contains the expected value
  • Lcobucci\JWT\Validation\Constraint\RelatedTo: verifies if the claim sub matches the expected value
  • Lcobucci\JWT\Validation\Constraint\SignedWith: verifies if the token was signed with the expected signer and key
  • Lcobucci\JWT\Validation\Constraint\StrictValidAt: verifies presence and validity of the claims iat, nbf, and exp (supports leeway configuration)
  • Lcobucci\JWT\Validation\Constraint\LooseValidAt: verifies the claims iat, nbf, and exp, when present (supports leeway configuration)
  • Lcobucci\JWT\Validation\Constraint\HasClaimWithValue: verifies that a custom claim has the expected value (not recommended when comparing cryptographic hashes)

You may also create your own validation constraints.