blue-twilight/app/Http/Requests/StoreStorageRequest.php

<?php

namespace App\Http\Requests;

use App\Storage;
use Illuminate\Foundation\Http\FormRequest;

class StoreStorageRequest extends FormRequest
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        switch ($this->method())
        {
            case 'POST':
                $result = [
                    'name' => 'required|unique:storages|max:255',
                    'source' => 'required|max:255',
                ];

                if ($this->get('source') == 'LocalFilesystemSource')
                {
                    $result['location'] = 'sometimes|required|is_dir|dir_empty|is_writeable';
                }

                return $result;

            case 'PATCH':
            case 'PUT':
                $storageId = intval($this->segment(3));

                return [
                    'name' => 'required|max:255|unique:storages,name,' . $storageId
                ];
        }

    }
}