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<?php
namespace Bitrix\Main\UrlPreview\Parser;
use Bitrix\Main\Context;
use Bitrix\Main\Text\Encoding;
use Bitrix\Main\UrlPreview\HtmlDocument;
use Bitrix\Main\UrlPreview\Parser;
class SchemaOrg extends Parser
{
/** @var \DOMDocument */
protected $dom;
/** @var array */
protected $schemaMetadata = array();
protected $documentEncoding;
/**
* Parses HTML document's Schema.org metadata.
*
* @param HtmlDocument $document
*/
public function handle(HtmlDocument $document)
{
$this->documentEncoding = $document->getEncoding();
if(mb_strpos($document->getHtml(), 'itemscope') === false)
return null;
if(!$this->initializeDom($document))
return null;
if(!$this->getSchemaMetadata())
return null;
if($document->getTitle() == '' && isset($this->schemaMetadata['name']))
{
$document->setTitle($this->schemaMetadata['name']);
}
if($document->getDescription() == '' && isset($this->schemaMetadata['description']))
{
$document->setDescription($this->schemaMetadata['description']);
}
if($document->getImage() == '' && isset($this->schemaMetadata['image']))
{
$document->setImage($this->schemaMetadata['image']);
}
}
/**
* @return bool
*/
protected function getSchemaMetadata()
{
// Starting with first node with itemscope attribute, to prevent walking over full document.
$xpath = new \DOMXPath($this->dom);
$itemScopeNodes = $xpath->query('//*[@itemscope]');
if(!is_a($itemScopeNodes, '\DOMNodeList') || $itemScopeNodes->length < 1)
return false;
$mainNode = $itemScopeNodes->item(0);
if(!is_a($mainNode, '\DOMElement'))
return false;
$this->walkDomTree($mainNode);
return true;
}
/**
* @param \DOMElement $currentNode
* @param int $currentDepth
*/
protected function walkDomTree(\DOMElement $currentNode, $currentDepth = 0)
{
$this->handleNode($currentNode);
foreach($currentNode->childNodes as $childNode)
{
if(is_a($childNode, '\DOMElement') && !($currentDepth == 0 xor $currentNode->hasAttribute('itemscope')))
{
$this->walkDomTree($childNode, $currentDepth + 1);
}
}
}
/**
* @param \DOMElement $node
* @return null|string
*/
protected function getSchemaPropertyValue(\DOMElement $node)
{
$result = null;
switch($node->tagName)
{
case 'img':
$result = $node->getAttribute('src');
break;
case 'meta':
$result = $node->getAttribute('content');
break;
case 'a':
$result = $node->getAttribute('href');
break;
case 'time':
if($node->hasAttribute('datetime'))
$result = $node->getAttribute('datetime');
else
$result = $node->textContent;
break;
case 'div':
$result = $this->getNodeInnerHtml($node);
break;
case 'p':
case 'span':
case 'h1':
case 'h2':
case 'h3':
case 'h4':
case 'h5':
case 'h6':
$result = $node->textContent;
break;
}
// dom extension's internal encoding is always utf-8
$result = Encoding::convertEncoding($result, 'utf-8', $this->documentEncoding);
$result = trim($result);
return ($result <> '' ? $result : null);
}
/**
* @param \DOMElement $node
*/
protected function handleNode(\DOMElement $node)
{
if($node->hasAttribute('itemprop') && !$node->hasAttribute('itemscope'))
{
$propertyName = mb_strtolower($node->getAttribute('itemprop'));
$propertyValue = $this->getSchemaPropertyValue($node);
$this->schemaMetadata[$propertyName] = $propertyValue;
}
}
/**
* @param \DOMElement $element
* @return string
*/
protected function getNodeInnerHtml(\DOMElement $element)
{
$innerHTML = "";
$children = $element->childNodes;
foreach ($children as $child)
{
$innerHTML .= $element->ownerDocument->saveHTML($child);
}
return $innerHTML;
}
/**
* @param HtmlDocument $document
* @return bool
*/
protected function initializeDom(HtmlDocument $document)
{
if(!class_exists('DOMDocument'))
{
return false;
}
$this->dom = new \DOMDocument();
// Prevents parsing errors bubbling
libxml_use_internal_errors(true);
$result = $this->dom->loadHTML('<?xml encoding="'.$document->getEncoding().'">'.$document->getHtml());
return $result;
}
}