Silex Login Form

app.php

$app->register(new Silex\Provider\SecurityServiceProvider(), array(
    'security.firewalls' => [
        'general' => [
            'pattern' => '^/',
            'anonymous' => true,
            'form' => [
                'login_path' => '/login',
                'check_path' => '/account/login_check',
                'always_use_default_target_path' => true,
                'default_target_path' => '/account/home'
            ],
            'logout' => [
                'logout_path' => '/account/logout',
                'target_url' => '/login',
                'invalidate_session' => true
            ],
            'users' => [
                'admin' => ['ROLE_ADMIN', '$2y$10$3i9/lVd8UOFIJ6PAMFt8gu3/r5g0qeCJvoSlLCsvMTythye19F77a'],
            ]
        ]
    ],
    'security.access_rules' => [
        ['^/account', 'ROLE_ADMIN']
    ],
    'security.role_hierarchy' => [
        'ROLE_ADMIN' => [
            'ROLE_USER',
            'ROLE_ALLOWED_TO_SWITCH'
        ],
    ]
));

controllers.php

$app->get('/', function (Request $request) use ($app) {
    return $app['twig']->render('home/home.html.twig');
})->bind('home');

$app->get('/login', function (Request $request) use ($app) {
    return $app['twig']->render('account/login.html.twig', array(
        'error' => $app['security.last_error']($request),
        'last_username' => $app['session']->get('_security.last_username'),
    ));
})->bind('login');

$app->get('/goodbye', function (Request $request) use ($app) {
    return new Response("Goodbye");
});

$app->get('/account/home', function () use ($app) {
    return $app['twig']->render('account/home.html.twig');
})->bind('account_home');

login.html.twig

{% extends "base.html.twig" %}

{% block content %}
    <div class="row">
        <div class="col-md-12">
            <div class="card text-center" style="width: 20rem;">
                <div class="card-header">
                    Login
                </div>
                <div class="card-body">
                    <form action="{{ path('account_login_check') }}" method="post">
                        {{ error }}
                        <div class="form-group">
                            <label for="username">Username</label>
                            <input class="form-control" type="text" id="username" name="_username" value="{{ last_username }}"/>
                        </div>
                        <div class="form-group">
                            <label for="password">Password</label>
                            <input class="form-control" type="password" id="password" name="_password" value=""/>
                        </div>
                        <input class="btn btn-primary btn-lg" type="submit" value="Login"/>
                    </form>
                </div>
                <div class="card-footer text-muted">
                    <a href="#">Lost Password?</a>
                </div>
            </div>
        </div>
    </div>
{% endblock %}