cssd-back/app/Http/Requests/StoreMessageRequest.php

<?php

namespace App\Http\Requests;

use App\Message;
use Illuminate\Validation\Rule;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Contracts\Validation\Validator;


class StoreMessageRequest extends FormRequest
{
    public function authorize()
    {
        if ($this->method() == 'POST') {
            return auth('api')->check() &&  auth('api')->user()->can('store', Message::class);
        } else {
            $Message = $this->route('Message');
            return auth('api')->check() && $Message && auth('api')->user()->can('update', $Message);
        }
    }

    public function rules()
    {
        switch ($this->method()) {
            case 'POST': {
                return [
                    'title' => 'nullable',
                    'text' => 'required',
                    'recipient_user_id' => 'required',
                ];
                break;
            }
            case 'PUT':
            case 'PATCH': {
                $Message =  $this->route('Message');
                return [
                    'title' => 'nullable',
                    'text' => 'required',
                    'recipient_user_id' => 'required',
                ];
                break;

            }
            default:
                break;
        }

    }

}