How to add a custom attribute value to product url in Magento 2

Question

I am using Magento ver. 2.2.3 . I need to add a custom attribute's (brand) value to the product url, like :

http://domain.com/smeg/smeg-cooker-90cm-with-gas-hob-cream.html

For that i have overridden the frontend product model & router, but nothing works. Can anyone suggest the solution. ?

etc/frontend/di.xml

<preference for="Magento\Catalog\Model\Product\Url"  type="Company\Module\Model\Url" />

<preference for="Magento\UrlRewrite\Controller\Router"  type="Company\Module\Controller\Router" />

Company\Module\Model\Url.php

<?php

namespace Company\Module\Model;

use Magento\UrlRewrite\Model\UrlFinderInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;

class Url extends \Magento\Catalog\Model\Product\Url
{
    protected $urlFactory;
    protected $storeManager;

    public function __construct(
        \Magento\Framework\UrlFactory $urlFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Filter\FilterManager $filter,
        \Magento\Framework\Session\SidResolverInterface $sidResolver,
        UrlFinderInterface $urlFinder
    ) {
        parent::__construct($urlFactory, $storeManager, $filter, $sidResolver, $urlFinder);
        $this->urlFactory = $urlFactory;
        $this->storeManager = $storeManager;
    }
    public function getUrl(\Magento\Catalog\Model\Product $product, $params = [])
    {
        $requestPath = $product->getRequestPath();  
        if (!empty($requestPath))
        {
             $params['_direct'] = $requestPath;
        }
        $baseUrl = $this->storeManager->getStore()->getBaseUrl();
        $productUrl = $this->getUrlInstance()->setScope($product->getStoreId())->getUrl(' ',$params);
        $_attributeValue = $product->getResource()->getAttribute('manufacturer')->getFrontend()->getValue($product);
        $remainingUrl = str_replace($baseUrl, '', $productUrl);

        $productUrl = $baseUrl. $_attributeValue . "/" . $remainingUrl;
        return $productUrl;
    }
    private function getUrlInstance()
    {
        return $this->urlFactory->create();
    }
}

Company\Module\Controller\Router.php

<?php

namespace Company\Module\Controller;

use Magento\UrlRewrite\Model\UrlFinderInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;

class Router implements \Magento\Framework\App\RouterInterface
{
    protected $actionFactory;
    protected $storeManager;
    protected $urlFinder;
    public function __construct(
        \Magento\Framework\App\ActionFactory $actionFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        UrlFinderInterface $urlFinder
    ) {
        $this->actionFactory = $actionFactory;
        $this->storeManager = $storeManager;
        $this->urlFinder = $urlFinder;
    } 
    public function match(\Magento\Framework\App\RequestInterface $request)
    {
        $identifier = trim($request->getPathInfo(), '/');
        $identifier = explode("/", $identifier);

        if(isset($identifier[0]) && !empty($identifier[0])) {
            $urlKey = str_replace('.html', '', $identifier[0]);

            if($urlKey) {   
                $objectManager     = \Magento\Framework\App\ObjectManager::getInstance();

                $collection        = $objectManager->create('Magento\Catalog\Model\ResourceModel\Product\Collection');

                $productcollection = $collection->addAttributeToSelect('*')
                    ->addAttributeToFilter(
                    [
                        ['attribute' => 'url_key', 'eq' => $urlKey], 
                    ]
                );
                $productInfo = $productcollection->getData();
                if(isset($productInfo) && !empty($productInfo)) {
                    $productId = $productInfo[0]['entity_id'];
                    $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
                    $product = $objectManager->create('Magento\Catalog\Model\Product')->load($productId);
                    $brand = $product->getResource()->getAttribute('manufacturer')->getFrontend()->getValue($product);
                    $brandUrl = $brand . "/";

                    $replaceUrl = str_replace($brandUrl, "", $request->getPathInfo());
                    $rewrite = $this->getRewrite($replaceUrl, $this->storeManager->getStore()->getId());    
                    if ($rewrite == null)
                    {
                        return null;
                    }
                    $request->setAlias(\Magento\Framework\UrlInterface::REWRITE_REQUEST_PATH_ALIAS, $rewrite->getRequestPath());
                    $request->setPathInfo('/' . $rewrite->getTargetPath());
                    return $this->actionFactory->create('Magento\Framework\App\Action\Forward');
                }
            }
        }
    }
    protected function getRewrite($requestPath, $storeId)
    {
        return $this->urlFinder->findOneByData([
            UrlRewrite::REQUEST_PATH => trim($requestPath, '/'),
            UrlRewrite::STORE_ID => $storeId,
        ]);
    }
}

Answer 1

First, we need to create ‘di.xml’ at the following location and add below code. app\code\Vendor\Extension\etc\di.xml

<?xml version="1.0"?><config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
<preference for="Magento\Catalog\Model\Product\Url"  type=" Vendor\Extension\Model\Url" /><preference for="Magento\UrlRewrite\Controller\Router"  type="Vendor\Extension\Controller\Router" /></config>

After that you need to create one more file that will fetch default Magento URLs so you can override those urls easily. For that purpose you need to create ‘Url.php’ inside your custom extension folder path. app\code\Vendor\Extension\Model\Url.php

<?php
namespace Vendor\Extension\Model;
use Magento\UrlRewrite\Model\UrlFinderInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;
class Url extends \Magento\Catalog\Model\Product\Url
{
    protected $urlFactory;
    protected $storeManager;
 
    public function __construct(
        \Magento\Framework\UrlFactory $urlFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\Framework\Filter\FilterManager $filter,
        \Magento\Framework\Session\SidResolverInterface $sidResolver,
        UrlFinderInterface $urlFinder
    ) {
        parent::__construct($urlFactory, $storeManager, $filter, $sidResolver, $urlFinder);
        $this->urlFactory = $urlFactory;
        $this->storeManager = $storeManager;
    }
    public function getUrl(\Magento\Catalog\Model\Product $product, $params = [])
    {
        $requestPath = $product->getRequestPath();  
        if (!empty($requestPath))
        {
                         $params['_direct'] = $requestPath;
        }
        $baseUrl = $this->storeManager->getStore()->getBaseUrl();
        $productUrl = $this->getUrlInstance()->setScope($product->getStoreId())->getUrl(' ',$params);
        $remainingUrl = str_replace($baseUrl, '', $productUrl);
        $productUrl = $baseUrl."custom-prefix/" . $remainingUrl;
        return $productUrl;
    }
    private function getUrlInstance()
    {
        return $this->urlFactory->create();
    }
}

At last step, we need to create ‘Router.php’ file at below location app\code\Vendor\Extension\Controller\Router.php

<?php
namespace Vendor\Extension\Controller;
use Magento\UrlRewrite\Model\UrlFinderInterface;
use Magento\UrlRewrite\Service\V1\Data\UrlRewrite;
class Router implements \Magento\Framework\App\RouterInterface
{
    protected $actionFactory;
    protected $storeManager;
    protected $urlFinder;
    public function __construct(
        \Magento\Framework\App\ActionFactory $actionFactory,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        UrlFinderInterface $urlFinder
    ) {
        $this->actionFactory = $actionFactory;
        $this->storeManager = $storeManager;
        $this->urlFinder = $urlFinder;
    } 
    public function match(\Magento\Framework\App\RequestInterface $request)
    {
        $replaceUrl = str_replace("custom-prefix/", "", $request->getPathInfo());
        $rewrite = $this->getRewrite($replaceUrl, $this->storeManager->getStore()->getId());    
        if ($rewrite == null)
    {
            return null;
        }
        $request->setAlias(\Magento\Framework\UrlInterface::REWRITE_REQUEST_PATH_ALIAS, $rewrite->getRequestPath());
        $request->setPathInfo('/' . $rewrite->getTargetPath());
        return $this->actionFactory->create('Magento\Framework\App\Action\Forward');
}
protected function getRewrite($requestPath, $storeId)
   {
        return $this->urlFinder->findOneByData([
            UrlRewrite::REQUEST_PATH => trim($requestPath, '/'),
            UrlRewrite::STORE_ID => $storeId,
        ]);
   }
}