magento 2 logout customer after successful registration

Question

I need to logout the user after successful registration. How can I achieve this,

Is there a admin settings in backend to do this.

Answer 1

How about going in the Magento backend, and set up the account setting to require customer to confirm his email (see screenshot below)

with this setting, once your customer has created his account, he won't be logged in. The screen will be like below:

Answer 2

magento does have a setting like this. You have to do customization.

In this case, you have to use two events

First,customer_register_success and customer_data_object_login,

When Customer is register then customer_register_success fire first then

customer_data_object_login fire.

On customer_register_success event add a registry variable

and then customer_data_object_login event catch this registry and run logout function.

The use of Registry flag, to prevent logout function on every customer_data_object_login observer call.

As we know that customer_data_object_login is called when customer is loggeding.

Create events.xml at app/code/{Vendorname}/{Modulename}/etc/frontend:

and code is :

<?xml version="1.0" encoding="UTF-8"?>
<!--
/**
 * @author Amit Bera
 * @copyright Copyright (c) 2018 amitbera.com (https://www.amitbera.com/)
 */
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
        xsi:noNamespaceSchemaLocation="urn:magento:framework:Event/etc/events.xsd"> 
    <event name="customer_register_success">
        <observer name="customer_register_success_set_flag"
                  instance="{Vendorname}\{Modulename}\Observer\customerRegisterSuccessObserver"/>
    </event> 

    <event name="customer_data_object_login">
        <observer name="customer_data_object_login_customer_logout" 
                  instance="{Vendorname}\{Modulename}\Observer\CustomerDataObjectLoginObserver"/>
    </event> 
</config>

Set registry variable, so create an observer class customerRegisterSuccessObserver.php at app/code/{Vendorname}/{Modulename}/Observer

And code is:

<?php
namespace {Vendorname}\{Modulename}\Observer;


class customerRegisterSuccessObserver implements \Magento\Framework\Event\ObserverInterface
{

    /**
     * @var \Magento\Framework\Registry
     */
    private $registry;

    public function __construct(
    \Magento\Framework\Registry $registry
    ) {

        $this->registry = $registry;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        if($this->registry->registry('customer_register')){
            $this->registry->unregister('customer_register');
        }
        // register flag
        $this->registry->register('customer_register', 'yes');
    }

}

check registry variable and fire logout so create another observer class CustomerDataObjectLoginObserver.php at app/code/{Vendorname}/{Modulename}/Observer

and code is:

<?php

namespace {Vendorname}\{Modulename}\Observer;


class CustomerDataObjectLoginObserver  implements \Magento\Framework\Event\ObserverInterface{

    /**
     * @var \Magento\Customer\Model\Session
     */
    private $customerSession;

    /**
     * @var \Magento\Framework\Registry
     */
    private $registry;

    public function __construct(
    \Magento\Framework\Registry $registry,
    \Magento\Customer\Model\Session $customerSession        
    ) {

        $this->registry = $registry;
        $this->customerSession = $customerSession;
    }   
    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        /**
         * Check variable and logout
         */
        if($this->registry->registry('customer_register')
                && $this->registry->registry('customer_register') == 'yes'){
            $this->customerSession->logout();
        } 
        return $this;
    }

}

Note that code is not test, post on base on idea.

Answer 3

It can be easily done by the following module.

https://github.com/amitshree/magento2-account-approval/blob/master/Plugin/Customer/Controller/Account/LoginPost.php

Done by 2 methods

1.Event customer_register_success

 public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $this->coreRegistry->register('is_new_account', true);
    }

2.Override Magento\Customer\Model\Account\Redirect

    $this->messageManager->getMessages(true);
    // Adding a custom message
    $this->messageManager->addErrorMessage(__('Your account is not approved. Kindly contact website admin for assitance.'));
    // Destroy the customer session in order to redirect him to the login page
    $this->session->destroy();
    /** @var \Magento\Framework\Controller\Result\Redirect $result */
    $result = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
    $result->setUrl($this->url->getUrl('customer/account/login'));
    return $result