ldc-doux/app/Http/Requests/UpdatePictoRequest.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

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

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'picture' => 'sometimes|image|mimes:png|max:512|dimensions:max_width=150,max_height=150',
            'alt_text_picture' => 'required|max:255',
            'text' => 'required|max:50',
        ];
    }
}