Пагинация категорий, canonical, prev и next

вот полный код со всеми canonical
это в файле catalog/controller/product/category.php

Код:

if ($page == 1) {
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'], 'SSL'), 'canonical');
                $this->document->setOgurl($this->url->link('product/category', 'path=' . $category_info['category_id'], 'SSL'));
            } elseif ($page == 2) {
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'], 'SSL'), 'canonical');
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'], 'SSL'), 'prev');
            } else {
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'], 'SSL'), 'canonical');
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'] . '&page='. ($page - 1), 'SSL'), 'prev');
            }

            if ($limit && ceil($product_total / $limit) > $page) {
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'], 'SSL'), 'canonical');
                $this->document->addLink($this->url->link('product/category', 'path=' . $category_info['category_id'] . '&page='. ($page + 1), 'SSL'), 'next');
            }