ldc-supportweb/app/Http/Requests/CreateMessage.php

<?php

namespace App\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class CreateMessage extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        $this->merge([
            'subscribe' => $this->subscribe ? true : false
        ]);
        return auth()->check() and (auth()->user()->role === 1 or
            $this->ticket->project->id === auth()->user()->project_id);
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        return [
            'subscribe' => 'required|boolean',
            'message' => 'required|min:' . (auth()->user()->role == 1 ? '5' : '20'),
            'file_message' => 'sometimes|mimes:jpeg,jpg,png,pdf|max:2048'
        ];
    }
}