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

<?php

namespace App\Http\Requests;

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

class StoreServiceRequest 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()
    {
        $result = [];

        switch ($this->method())
        {
            case 'POST':
                $result = [
                    'name' => 'required|unique:external_services|max:255',
                    'service_type' => 'required|max:255',
                ];

                switch ($this->get('service_type'))
                {
                    case ExternalService::DROPBOX:
                    case ExternalService::FACEBOOK:
                    case ExternalService::GOOGLE:
                    case ExternalService::TWITTER:
                        // Standard OAuth services
                        $result['app_id'] = 'sometimes|required';
                        $result['app_secret'] = 'sometimes|required';
                        break;
                }
                break;

            case 'PATCH':
            case 'PUT':
                $serviceId = intval($this->segment(3));
                $service = ExternalService::find($serviceId);
                $result = [
                    'name' => 'required|max:255|unique:external_services,name,' . $serviceId
                ];

                switch ($service->service_type)
                {
                    case ExternalService::DROPBOX:
                    case ExternalService::FACEBOOK:
                    case ExternalService::GOOGLE:
                    case ExternalService::TWITTER:
                        // Standard OAuth services
                        $result['app_id'] = 'sometimes|required';
                        $result['app_secret'] = 'sometimes|required';
                        break;
                }
                break;
        }

        return $result;
    }
}