Canonical URLs and page titles / internal links

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$this->document->addLink($this->url->link('product/product', 'product_id=' . $this->request->get['product_id']), 'canonical');

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if($this->model_catalog_product->getCategoryPath($this->request->get['product_id'])!='0'){
    $this->document->addLink($this->url->link('product/product', 'path=' . $this->model_catalog_product->getCategoryPath($this->request->get['product_id']) . '&product_id=' . $this->request->get['product_id']), 'canonical');
}else{
    $this->document->addLink($this->url->link('product/product', 'product_id=' . $this->request->get['product_id']), 'canonical');
}

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}
?>

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	public function getCategoryPath($product_id) {
		$query = $this->db->query("SELECT COUNT(product_id) AS total, category_id as catid FROM " . DB_PREFIX . "product_to_category WHERE product_id = '" . (int)$product_id . "'");
		
		if($query->row['total']==1){
			$path = array();
			$path[0] = $query->row['catid'];
			
			$query = $this->db->query("SELECT parent_id AS pid FROM " . DB_PREFIX . "category WHERE category_id = '" . (int)$path[0] . "'");

			$parent = $query->row['pid'];
			
			$p = 1;
			while($parent>0){
				$path[$p] = $parent;
				
				$query = $this->db->query("SELECT parent_id AS pid FROM " . DB_PREFIX . "category WHERE category_id = '" . (int)$parent . "'");
				$parent = $query->row['pid'];
				$p++;
			}
		
			$path = array_reverse($path);
			
			$fullpath = '';
			
			foreach($path as $val){
				$fullpath .= '_'.$val;
			}
		
			return ltrim($fullpath, '_');
		}else{
			return '0';
		}
	}			

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User-agent: *
Disallow: /*?sort
Disallow: /*&sort
Disallow: /*?limit
Disallow: /*&limit
Disallow: /*?route=checkout
Disallow: /*?route=account
Disallow: /*?route=product/search
Disallow: /*&keyword
Disallow: /*?page=1
Allow: /

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		if (isset($this->request->get['path'])) {
			$path = '';
				
			foreach (explode('_', $this->request->get['path']) as $path_id) {
				if (!$path) {
					$path = $path_id;
				} else {
					$path .= '_' . $path_id;
				}
				
				$category_info = $this->model_catalog_category->getCategory($path_id);
				
				if ($category_info) {
					$this->data['breadcrumbs'][] = array(
						'text'      => $category_info['name'],
						'href'      => $this->url->link('product/category', 'path=' . $path),
						'separator' => $this->language->get('text_separator')
					);
				}
			}
		} else {
		
			$path = '';
				
			foreach (explode('_', $this->model_catalog_product->getCategoryPath($this->request->get['product_id'])) as $path_id) {
				if (!$path) {
					$path = $path_id;
				} else {
					$path .= '_' . $path_id;
				}
				
				$category_info = $this->model_catalog_category->getCategory($path_id);
				
				if ($category_info) {
					$this->data['breadcrumbs'][] = array(
						'text'      => $category_info['name'],
						'href'      => $this->url->link('product/category', 'path=' . $path),
						'separator' => $this->language->get('text_separator')
					);
				}
			}
		
		}

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	<file name="catalog/controller/product/category.php">
       	<operation>
            <search position="after"><![CDATA[
            $this->document->setKeywords($category_info['meta_keyword']);
            ]]></search>
            <add><![CDATA[
			$this->document->addLink($this->url->link('product/category', 'path=' . $this->request->get['path']), 'canonical');
            ]]></add>
        </operation>
	</file>