Simple example of an L4 authentication controller using Symfony2

sentry_controller_example.php

<?php
class AuthController extends BaseController {
    public function login()
    {
        try
        {
            // Set login credentials
            $credentials = array(
                'email'    => Input::get('email') ?: null,
                'password' => Input::get('password') ?: null
            );
            // Authenticate our user and log them in
            $user = Sentry::authenticate($credentials, Input::get('remember_me') ?: false);
            // Tell them what a great job they did logging in.
            Alert::success(trans('success/authorize.login.successful'))->flash();
            // Send them where they wanted to go
            return Redirect::intended('/');
        }
        catch (Cartalyst\Sentry\Users\LoginRequiredException $e)
        {
            Alert::error(trans('errors/authorize.login.required'))->flash();
        }
        catch (Cartalyst\Sentry\Users\PasswordRequiredException $e)
        {
            Alert::error(trans('errors/authorize.login.password.required'))->flash();
        }
        catch (Cartalyst\Sentry\Users\WrongPasswordException $e)
        {
            Alert::error(trans('errors/authorize.login.password.wrong'))->flash();
        }
        catch (Cartalyst\Sentry\Users\UserNotFoundException $e)
        {
            Alert::error(trans('errors/authorize.login.user.found'))->flash();
        }
        catch (Cartalyst\Sentry\Users\UserNotActivatedException $e)
        {
            Alert::error(trans('errors/authorize.login.user.activated'))->flash();
        }
        // The following is only required if throttle is enabled
        catch (Cartalyst\Sentry\Throttling\UserSuspendedException $e)
        {
            Alert::error(trans('errors/authorize.login.user.suspended'))->flash();
        }
        catch (Cartalyst\Sentry\Throttling\UserBannedException $e)
        {
            Alert::error(trans('errors/authorize.login.user.banned'))->flash();
        }
        return Redirect::back()->withInput(Input::except('password'));
    }
    public function logout()
    {
        Sentry::logout();
        Alert::success(trans('success/authorize.logout.successful'))->flash();
        return Redirect::to('/');
    }
}