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<?php
namespace Bitrix\Main\UrlPreview\Parser;
use Bitrix\Main\UrlPreview\HtmlDocument;
use Bitrix\Main\UrlPreview\Parser;
use Bitrix\Main\Web\Uri;
class Common extends Parser
{
const MIN_IMAGE_HEIGHT = 100;
const MIN_IMAGE_WIDTH = 100;
/** @var array img elements, discovered in the document */
protected $imgElements = array();
/**
* Parses HTML document's meta tags, and fills document's metadata.
*
* @param HtmlDocument $document HTML document to scan for metadata.
* @return void
*/
public function handle(HtmlDocument $document)
{
if($document->getTitle() == '')
{
$document->setTitle($this->getTitle($document));
}
if($document->getDescription() == '')
{
$document->setDescription($document->getMetaContent('description'));
}
$this->imgElements = $document->extractElementAttributes('img');
if($document->getImage() == '')
{
$image = $this->getImage($document);
if($image <> '')
{
$document->setImage($image);
}
else
{
$imageCandidates = $this->getImageCandidates();
if(count($imageCandidates) === 1)
{
$document->setImage($imageCandidates[0]);
}
else if(count($imageCandidates) > 1)
{
$document->setExtraField('IMAGES', $imageCandidates);
}
}
}
if($document->getExtraField('VIDEO') == '')
{
preg_match_all("/<video.+?<\/video>/mis", $document->getHtml(), $videoTags);
foreach($videoTags[0] as $videoTag)
{
$videoInfo = $this->getVideoInfo($videoTag);
if(!empty($videoInfo))
{
$document->setExtraField('VIDEO', $videoInfo['src']);
$document->setExtraField('VIDEO_TYPE', $videoInfo['type']);
$document->setExtraField('VIDEO_WIDTH', $videoInfo['width']);
$document->setExtraField('VIDEO_HEIGHT', $videoInfo['height']);
}
}
}
}
/**
* @param HtmlDocument $document HTML document to scan for title.
* @return string
*/
protected function getTitle(HtmlDocument $document)
{
$title = $document->getMetaContent('title');
if($title <> '')
{
return $title;
}
preg_match('/<title>(.+?)<\/title>/mis', $document->getHtml(), $matches);
return (isset($matches[1]) ? $matches[1] : null);
}
/**
* @param HtmlDocument $document
* @return string
*/
protected function getImage(HtmlDocument $document)
{
$result = $document->getLinkHref('image_src');
if($result <> '')
{
return $result;
}
foreach($this->imgElements as $imgElement)
{
if(isset($imgElement['rel']) && $imgElement['rel'] == 'image_src')
{
$result = $imgElement['src'];
return $result;
}
}
return null;
}
/**
* Iterates through img elements, and return array of urls of images, which size is greater then 100pxx100px
* @return array
*/
protected function getImageCandidates()
{
$result = array();
foreach ($this->imgElements as $imgElement)
{
$imageDimensions = $this->getImageDimensions($imgElement);
if($imageDimensions['width'] >= self::MIN_IMAGE_WIDTH && $imageDimensions['height'] >= self::MIN_IMAGE_HEIGHT)
{
$result[] = $imgElement['src'];
}
}
return $result;
}
/**
* Returns size of the img element
* @param array $imageAttributes Array of the attributes of the img tag.
* @return array Returns array with keys width and height.
*/
protected function getImageDimensions(array $imageAttributes)
{
$result = array(
'width' => null,
'height' => null
);
foreach(array_keys($result) as $imageDimension)
{
if(isset($imageAttributes[$imageDimension]))
{
$result[$imageDimension] = $imageAttributes[$imageDimension];
}
else if(isset($imageAttributes['style']) && preg_match('/'.$imageDimension.':\s*(\d+?)px/', $imageAttributes['style'], $matches))
{
$result[$imageDimension] = $matches[1];
}
}
return $result;
}
/**
* Parse one <video> tag and try to get valid information off it.
*
* @param string $html - one <video> from the document.
* @return array
*/
protected function getVideoInfo($html = '')
{
$maxWeight = -1;
$result = array();
$uri = new Uri('/');
$document = new HtmlDocument($html, $uri);
$videoElements = $document->extractElementAttributes('video');
foreach($videoElements as $videoElement)
{
if(!isset($videoElement['src']))
{
$sourceElements = $document->extractElementAttributes('source');
foreach($sourceElements as $sourceElement)
{
if(
(isset($sourceElement['type']) &&
$this->isValidVideoMimeType($sourceElement['type'])) ||
!isset($videoElement['src']))
{
$videoElement['src'] = $sourceElement['src'];
$videoElement['type'] = $sourceElement['type'];
break;
}
}
}
if(isset($videoElement['src']))
{
if(
(isset($videoElement['width']) &&
isset($videoElement['height']) &&
$videoElement['width'] * $videoElement['height'] > $maxWeight) ||
(empty($result))
)
{
$result = $videoElement;
$maxWeight = 0;
if(isset($videoElement['width']) && isset($videoElement['height']))
{
$maxWeight = $videoElement['width'] * $videoElement['height'];
}
}
}
}
return $result;
}
/**
* Returns true if $type is a valid video mime-type.
*
* @param string $type
* @return bool
*/
protected function isValidVideoMimeType($type = '')
{
if(empty($type))
{
return false;
}
static $validTypes = array(
'video/mp4', 'video/x-flv', 'video/webm', 'video/ogg', 'video/quicktime'
);
return in_array($type, $validTypes);
}
}