public function login()
{
    $client = DB::table('oauth_clients')
        ->where('password_client', true)
        ->first();

    $data = [
        'grant_type' => 'password',
        'client_id' => $client->id,
        'client_secret' => $client->secret,
        'username' => request('username'),
        'password' => request('password'),
    ];

    $request = Request::create('/oauth/token', 'POST', $data);

    return app()->handle($request);
}