invoiceninja/app/Http/Requests/Setup/StoreSetupRequest.php

<?php
/**
 * Invoice Ninja (https://invoiceninja.com).
 *
 * @link https://github.com/invoiceninja/invoiceninja source repository
 *
 * @copyright Copyright (c) 2021. Invoice Ninja LLC (https://invoiceninja.com)
 *
 * @license https://opensource.org/licenses/AAL
 */

namespace App\Http\Requests\Setup;

use App\Http\Requests\Request;

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

    public function rules()
    {
        $rules = [
			/*System*/
			'url'              => 'required',
			/*Mail driver*/
			'mail_driver'      => 'required',
			'encryption'       => 'required_unless:mail_driver,log',
			'mail_host'        => 'required_unless:mail_driver,log',
			'mail_username'    => 'required_unless:mail_driver,log',
			'mail_name'        => 'required_unless:mail_driver,log',
			'mail_address'     => 'required_unless:mail_driver,log',
			'mail_password'    => 'required_unless:mail_driver,log',
			/*user registration*/
			'privacy_policy'   => 'required',
			'terms_of_service' => 'required',
			'first_name'       => 'required',
			'last_name'        => 'required',
			'email'            => 'required|email:rfc,dns',
			'password'         => 'required',
		];

		if ( ! config( 'ninja.preconfigured_install' ) ) {
			$rules = array_merge( $rules, [
				/*Database*/
				'db_host'     => 'required',
				'db_database' => 'required',
				'db_username' => 'required',
				'db_password' => '',
			] );
		}

		return $rules;
	}

    protected function prepareForValidation()
    {
        $input = $this->all();

        $input['user_agent'] = request()->server('HTTP_USER_AGENT');

        $this->replace($input);
    }
}