ldc-web/app/Http/Controllers/HomeController.php

<?php

namespace App\Http\Controllers;

use Illuminate\Support\Facades\Auth;
use SimpleSoftwareIO\QrCode\Facades\QrCode;

class HomeController extends Controller
{
    /**
     * Show the application dashboard.
     *
     * @return \Illuminate\Contracts\Support\Renderable
     */
    public function index()
    {
        // $secret = Totp::GenerateSecret(16);
        // Display new key to user so they can enter it in Google Authenticator or Authy
        // echo strtoupper(Base32::encode($secret));exit;
        // otpauth://totp/LDC%20WEB:mail@ldc.fr?secret=secret&issuer=LDC%20WEB
        return view('home');
    }

    /**
     * Generate QR code
     *
     * @return \Illuminate\Contracts\View\View|\Illuminate\Contracts\View\Factory
     */
    public function qr()
    {
        $user   = Auth::user();
        $qrcode = QrCode::size(200)->generate(
            "otpauth://totp/LDC%20WEB:$user->email?secret=$user->totp_secret&issuer=LDC%20WEB"
        );
        return view("qrcode", compact('qrcode'));
    }
}