crater/app/Http/Requests/DatabaseEnvironmentRequest.php

<?php

namespace Crater\Http\Requests;

use Illuminate\Foundation\Http\FormRequest;

class DatabaseEnvironmentRequest 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->get('database_connection')) {
            case 'sqlite':
                return  [
                    'app_url' => [
                        'required',
                        'url',
                    ],
                    'database_connection' => [
                        'required',
                        'string',
                    ],
                    'database_name' => [
                        'required',
                        'string',
                    ],
                ];

                break;
            default:
                return  [
                    'app_url' => [
                        'required',
                        'url',
                    ],
                    'database_connection' => [
                        'required',
                        'string',
                    ],
                    'database_hostname' => [
                        'required',
                        'string',
                    ],
                    'database_port' => [
                        'required',
                        'numeric',
                    ],
                    'database_name' => [
                        'required',
                        'string',
                    ],
                    'database_username' => [
                        'required',
                        'string',
                    ],
                ];

            break;

        }
    }
}