/**
* @param HtmlDocument $document
* @return string
*/
protected function getImage(HtmlDocument $document)
{
$result = $document->getLinkHref('image_src');
if (strlen($result) > 0) {
return $result;
}
foreach ($this->imgElements as $imgElement) {
if (isset($imgElement['rel']) && $imgElement['rel'] == 'image_src') {
$result = $imgElement['src'];
return $result;
}
}
return null;
}
/**
* Executes chain of parsers, passing them $document
*
* @param HtmlDocument $document
*/
public static function extractMetadata(HtmlDocument $document)
{
foreach (static::getParserChain($document->getUri()) as $parserClassName) {
/** @var \Bitrix\Main\UrlPreview\Parser $parser */
if (class_exists($parserClassName)) {
$parser = new $parserClassName();
if (is_a($parser, '\\Bitrix\\Main\\UrlPreview\\Parser')) {
$parser->handle($document);
}
}
if ($document->checkMetadata()) {
break;
}
}
}
/**
* @param HtmlDocument $document
* @return bool
*/
protected function detectOembedLink(HtmlDocument $document)
{
preg_match_all('/<link.+?alternate.+?>/', $document->getHtml(), $linkElements);
foreach ($linkElements[0] as $linkElement) {
$typeJson = strpos($linkElement, $this::OEMBED_TYPE_JSON) !== false;
$typeXml = strpos($linkElement, $this::OEMBED_TYPE_XML) !== false;
if ($typeJson || $typeXml) {
if (preg_match('/href=[\'"](.+?)[\'"]/', $linkElement, $attributes)) {
$this->metadataType = $typeJson ? 'json' : 'xml';
$this->metadataUrl = $attributes[1];
return true;
}
}
}
return false;
}
/**
* @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;
}
/**
* @param Uri $uri Absolute URL to get metadata for.
* @return array|false
*/
protected static function getRemoteUrlMetadata(Uri $uri)
{
$httpClient = new HttpClient();
$httpClient->setTimeout(5);
$httpClient->setStreamTimeout(5);
if (!$httpClient->query('GET', $uri->getUri())) {
return false;
}
if ($httpClient->getStatus() !== 200) {
return false;
}
$htmlContentType = strtolower($httpClient->getHeaders()->getContentType());
if ($htmlContentType !== 'text/html') {
return static::getFileMetadata($httpClient->getEffectiveUrl(), $httpClient->getHeaders());
}
$html = $httpClient->getResult();
$htmlDocument = new HtmlDocument($html, $uri);
$htmlDocument->setEncoding($httpClient->getCharset());
ParserChain::extractMetadata($htmlDocument);
$metadata = $htmlDocument->getMetadata();
if (is_array($metadata) && static::validateRemoteMetadata($metadata)) {
if (isset($metadata['IMAGE']) && static::getOptionSaveImages()) {
$metadata['IMAGE_ID'] = static::saveImage($metadata['IMAGE']);
unset($metadata['IMAGE']);
}
return $metadata;
}
return false;
}
/**
* Parses HTML documents OpenGraph metadata
*
* @param HtmlDocument $document HTML document to be parsed.
* @return void
*/
public function handle(HtmlDocument $document)
{
if (strlen($document->getTitle()) == 0) {
$ogTitle = $document->getMetaContent('og:title');
if (strlen($ogTitle) > 0) {
$document->setTitle($ogTitle);
}
}
if (strlen($document->getDescription()) == 0) {
$ogDescription = $document->getMetaContent('og:description');
if (strlen($ogDescription) > 0) {
$document->setDescription($ogDescription);
}
}
if (strlen($document->getImage()) == 0) {
$ogImage = $document->getMetaContent('og:image:secure_url') ?: $document->getMetaContent('og:image');
if (strlen($ogImage) > 0) {
$document->setImage($ogImage);
}
}
if (!$document->getExtraField('SITE_NAME')) {
$ogSiteName = $document->getMetaContent('og:site_name');
if (strlen($ogSiteName) > 0) {
$document->setExtraField('SITE_NAME', $ogSiteName);
}
}
/* Not really opengraph property :), but it's placed in opengraph parser to prevent executing full parser chain
just to get favicon */
if (!$document->getExtraField('FAVICON')) {
if ($favicon = $document->getLinkHref('icon')) {
$document->setExtraField('FAVICON', $favicon);
}
}
}
