webapp/app/Http/Controllers/HomeController.php

<?php

namespace App\Http\Controllers;


use App\User;
use Illuminate\Http\Request;
use Illuminate\Validation\ValidationException;
use Laravel\Lumen\Routing\Controller as BaseController;

class HomeController extends BaseController
{
    public function home(Request $request)
    {
        return view('home');
    }

    public function iframe(Request $request)
    {
        $user = null;

        try {
            $errors = [];
            $data = $this->validate($request, [
                'email' => 'required|email|unique:users'
            ]);

            $token = bin2hex(random_bytes(72));

            $user = new User(['email' => $data['email']]);
            $user->token = $token;
            $user->save();

            return view('registered', [
                'user' => $user,
            ]);

        } catch (ValidationException $e) {
            $errors = $e->errors();
            $data = [];
        } catch (\Exception $e) {
            $errors = ['email' => 'Impossible de générer le token'];
            $data = [];
        }

        return view('registration', [
            'data' => $data,
            'errors' => $errors
        ]);
    }
}