Using Silex Firewall in SecurityServiceProvider with {_locale} - security

Question

When I configure Silex SecurityServiceProvider to work with {_locale} param, login.check_path returns a LogicException as follow:
LogicException: The controller must return a response (null given). Did you forget to add a return statement somewhere in your controller?
Following is my settings:
$app->register(new Silex\Provider\SecurityServiceProvider, [
'security.firewalls' => [
'login' => [
'pattern' => '^/{_locale}/login',
'security' => false,
],
'games' => [
'pattern' => '^/{_locale}/modules/',
'form' => [
'login_path' => '/{_locale}/login',
'check_path' => '/{_locale}/modules/login_check',
],
'logout' => [
'logout_path' => '/{_locale}/modules/logout',
],
...
],
...
],
]);
login_path and firewall handling seem to work fine, but can't finalize login process.
What's wrong with it?
I also ask you what's the correct route name of login_path, check_path and logout_path to serve to Twig {{ path() }} method, as I can't figure it out due to {_locale} presence.
Thank you.

Answer 1

Had the same problem today :) and found this solution:
add default_target_path and always_use_default_target_path to your security.firewalls form config.
'form' => array(
'login_path' => '/',
'check_path' => 'login_check',
'default_target_path' => '/' . $app['locale'],
'always_use_default_target_path' => true
),
Edit
So using $app['locale'] doesn't work well.
It's better you use $app['session']->get('locale') and set locale to session in a before middleware
$app->before(function (Request $request) use ($app) {
$app['session']->set('locale', $app['locale']);
....
});
Maybe somebody has a better solution by overloading event listeners. But I think this is a quick solution.