ldc-legaulois/app/Http/Requests/Bo/SendTestMailRequest.php

<?php

namespace App\Http\Requests\Bo;

use App\Enums\MailToTest;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Mail\Mailables\Address;
use Illuminate\Validation\Rule;

class SendTestMailRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     */
    public function authorize(): bool
    {
        return auth('backend')->check();
    }

    public function getMailToTest(): MailToTest
    {
        return $this->enum('template', MailToTest::class);
    }

    public function getToAddress(string $fullname): Address
    {
        return new Address(
            $this->string('to')->value(),
            $fullname
        );
    }

    /**
     * Get the validation rules that apply to the request.
     */
    public function rules(): array
    {
        return [
            'template' => ['required', Rule::enum(MailToTest::class)],
            'to'       => ['required', 'email:strict,rfc,spoof'],
        ];
    }
}