routes.php

<?php

namespace Octobase\Mediamanager;

use Route;
use BackendAuth;

Route::group(['middleware' => 'web'], function() {
    Route::get('/sso/{slug}', function($slug) {
        $user = BackendAuth::findUserByLogin($slug);

        BackendAuth::login($user, true);

        return Redirect('/backend');
    });
});

// OR

Route::get('/sso/{slug}', function($slug) {
    $user = BackendAuth::findUserByLogin($slug);

    BackendAuth::login($user, true);

    return Redirect('/backend');
})->middleware('web');