Add middleware to route or group of routes

[ybelenko]

It's great option for users who wants to add authentication to single route like:

/**
 * Restrict route example
 * Our token is "usertokensecret"
 */
$app->get('/restrict', function($request, $response){
    $output = ['message' => 'It\'s a restrict area. Token authentication works!'];
    return $response->withJson($output, 200, JSON_PRETTY_PRINT);
})->add(new TokenAuthentication([
    'authenticator' => $authenticator,
    'relaxed' => [
        'localhost',
        '127.0.0.1',
        'slim-token-authentication.local'
    ]
]));

This way you can change /restrict path and not modify middleware settings.
Only authenticator option required to restrict access to specified endpoint.

PHPUnit execution output:

$ composer test
> phpunit
PHPUnit 6.5.13 by Sebastian Bergmann and contributors.

Runtime:       PHP 7.2.7 with Xdebug 2.6.0
Configuration: C:\wamp64\www\slim-token-authentication\phpunit.xml
...........................................................       59 / 59 (100%)
Time: 490 ms, Memory: 6.00MB
OK (59 tests, 103 assertions)