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<?php
namespace Bitrix\Main\UrlPreview\Parser;
use Bitrix\Main\Text\Encoding;
use Bitrix\Main\UrlPreview\UrlPreview;
use Bitrix\Main\Web\HttpClient;
use Bitrix\Main\UrlPreview\HtmlDocument;
use Bitrix\Main\UrlPreview\Parser;
class Oembed extends Parser
{
const OEMBED_TYPE_XML = "text/xml+oembed";
const OEMBED_TYPE_JSON ="application/json+oembed";
/** @var string Possible values: (json|xml) */
protected $metadataType;
/** @var string */
protected $metadataUrl;
/** @var string */
protected $metadataEncoding;
/**
* Downloads and parses HTML's document metadata, formatted with oEmbed standard.
*
* @param HtmlDocument $document HTML document.
* @param HttpClient|null $httpClient
*/
public function handle(HtmlDocument $document, HttpClient $httpClient = null)
{
if(!$this->detectOembedLink($document) || $this->metadataUrl == '')
{
return;
}
$isHttpClientPassed = true;
if(!$httpClient)
{
$httpClient = $this->initHttpClient();
$isHttpClientPassed = false;
}
$rawMetadata = $this->getRawMetaData($httpClient);
// if request was served through http - try to switch to https
if(
(
!$rawMetadata
|| $httpClient->getStatus() === 403
)
&& mb_strpos($this->metadataUrl, 'http://') === 0)
{
if(!$isHttpClientPassed)
{
$httpClient = $this->initHttpClient();
}
$metadataUrl = str_replace('http://', 'https://', $this->metadataUrl);
$rawMetadata = $httpClient->get($metadataUrl);
}
if($rawMetadata === false)
{
return;
}
$parsedMetadata = $this->parseMetadata($rawMetadata);
if($parsedMetadata !== false)
{
if($this->metadataEncoding <> '' && $document->getEncoding() !== $this->metadataEncoding)
{
$parsedMetadata = Encoding::convertEncoding($parsedMetadata, $this->metadataEncoding, $document->getEncoding());
}
if($document->getTitle() == '' && $parsedMetadata['title'] != '')
{
$document->setTitle($parsedMetadata['title']);
}
if($document->getImage() == '' && $parsedMetadata['thumbnail_url'] != '')
{
$document->setImage($parsedMetadata['thumbnail_url']);
}
if($document->getEmdbed() == '' && $parsedMetadata['html'] != '')
{
$document->setEmbed($parsedMetadata['html']);
}
if($document->getExtraField('PROVIDER_NAME') == '' && $parsedMetadata['provider_name'] != '')
{
$document->setExtraField('PROVIDER_NAME', $parsedMetadata['provider_name']);
}
if($document->getExtraField('VIDEO_WIDTH') == '' && $parsedMetadata['width'] != '')
{
$document->setExtraField('VIDEO_WIDTH', $parsedMetadata['width']);
}
if($document->getExtraField('VIDEO_HEIGHT') == '' && $parsedMetadata['height'] != '')
{
$document->setExtraField('VIDEO_HEIGHT', $parsedMetadata['height']);
}
}
}
/**
* @param HtmlDocument $document
* @return bool
*/
protected function detectOembedLink(HtmlDocument $document)
{
preg_match_all('/<link.+?alternate.+?>/', $document->getHtml(), $linkElements);
foreach($linkElements[0] as $linkElement)
{
$typeJson = (mb_strpos($linkElement, $this::OEMBED_TYPE_JSON) !== false);
$typeXml = (mb_strpos($linkElement, $this::OEMBED_TYPE_XML) !== false);
if($typeJson || $typeXml)
{
if(preg_match('/href=[\'"](.+?)[\'"]/', $linkElement, $attributes))
{
$this->metadataType = ($typeJson ? 'json' : 'xml');
$this->metadataUrl = htmlspecialcharsback($attributes[1]);
return true;
}
}
}
return false;
}
/**
* @param string $rawMetadata
* @return array|false
*/
protected function parseMetadata($rawMetadata)
{
switch($this->metadataType)
{
case 'json':
return $this->parseJsonMetadata($rawMetadata);
break;
case 'xml':
return $this->parseXmlMetadata($rawMetadata);
break;
}
return false;
}
protected function parseJsonMetadata($rawMetadata)
{
$parsedMetadata = json_decode($rawMetadata, true);
$this->metadataEncoding = 'UTF-8';
return $parsedMetadata;
}
/**
* @param string $rawMetadata
* @return array|false
*/
protected function parseXmlMetadata($rawMetadata)
{
$xml = new \CDataXML();
if($xml->LoadString($rawMetadata))
{
//detect xml encoding
if(preg_match('/<\?xml[^>]+?encoding=[\'"](.+?)[\'"]\?>/', $rawMetadata, $matches))
$this->metadataEncoding = $matches[1];
else
$this->metadataEncoding = 'UTF-8';
$result = array();
$dom = $xml->GetTree();
$mainNode = $dom->elementsByName('oembed');
foreach($mainNode[0]->children as $node)
{
$result[$node->name] = $node->content;
}
return $result;
}
return false;
}
protected function getRawMetaData(HttpClient $httpClient)
{
$rawMetadata = $httpClient->get($this->metadataUrl);
return $rawMetadata;
}
protected function initHttpClient(): HttpClient
{
$httpClient = new HttpClient();
$httpClient->setTimeout(5);
$httpClient->setStreamTimeout(5);
$httpClient->setHeader('User-Agent', UrlPreview::USER_AGENT, true);
$httpClient->setPrivateIp(false);
return $httpClient;
}
}