How to check customer is authenticated(login) or not in Magento 2?

Customer Authentication in Magento 2 is required when we have to check the customer is a guest user or a login user.

There are many occasions when we have to check the customer is login or not, and based on the login customer, only we have to show a specific page; otherwise, redirect it to the login page.

To verify whether it’s a login customer or not,
use \Magento\Customer\Model\Session Class and add the Customer Session class to the __construct() method of your Controller.

<?php

namespace Magemonkeys\FavoriteList\Controller\Index;

use Magento\Framework\App\Action;
use Magento\Customer\Model\Session;
use Magento\Framework\View\Result\Page;
use Magento\Framework\App\Action\Context;
use Magento\Framework\Controller\ResultFactory;

class Index extends Action
{
    /**
     * @var Session
     */
    protected $customerSession;

    public function __construct(
        Context $context,
        Session $customerSession
    ) {
        $this->customerSession = $customerSession;
        parent::__construct($context);
    }

    /**
     * Prepare wishlist for share
     *
     * @return ResultInterface
     */
    public function execute()
    {
        if (!$this->customerSession->authenticate()) {
            /** @var Page $resultPage */
            $result = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);
            $result->setPath('customer/account/login');
            return $result;
        }

        // do your logic here
    }
}

<?php

namespace Magemonkeys\FavoriteList\Controller\Index;

use Magento\Framework\App\Action;

use Magento\Customer\Model\Session;

use Magento\Framework\View\Result\Page;

use Magento\Framework\App\Action\Context;

use Magento\Framework\Controller\ResultFactory;

class Index extends Action

{

/**

* @var Session

protected $customerSession;

public function __construct(

Context $context,

Session $customerSession

) {

$this->customerSession = $customerSession;

parent::__construct($context);

}

/**

* Prepare wishlist for share

* @return ResultInterface

public function execute()

{

if (!$this->customerSession->authenticate()) {

/** @var Page $resultPage */

$result = $this->resultFactory->create(ResultFactory::TYPE_REDIRECT);

$result->setPath('customer/account/login');

return $result;

}

// do your logic here

}

Using this approach, we can check the customer is a login customer or not.

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