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<?php |
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namespace Jclyons52\PagePreview; |
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use Jclyons52\PHPQuery\Document; |
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class Crawler |
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{ |
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/** |
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* PHPQuery document object that will be used to select elements |
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* @var \Jclyons52\PHPQuery\Document |
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*/ |
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private $document; |
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public function __construct(Document $document) |
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{ |
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$this->document = $document; |
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} |
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/** |
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* @return array |
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*/ |
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public function getPreviewData($url) |
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{ |
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$title = $this->title(); |
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$images = $this->formatImages($url); |
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$description = $this->meta('description'); |
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$meta = $this->meta(); |
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$keywords = $this->metaKeywords(); |
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if ($keywords !== []) { |
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$meta['keywords'] = $keywords; |
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} |
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return [ |
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'title' => $title, |
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'images' => $images, |
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'description' => $description, |
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'url' => $url->original, |
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'meta' => $meta, |
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]; |
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} |
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/** |
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* get source attributes of all image tags on the page |
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* @return array<String> |
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*/ |
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public function images() |
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{ |
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$images = $this->document->querySelectorAll('img'); |
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if ($images === []) { |
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return []; |
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} |
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$urls = $images->attr('src'); |
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$urls = array_filter($urls, function ($url) { |
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$url = trim($url); |
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return $url; |
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}); |
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return $urls; |
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} |
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/** |
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* @return string |
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*/ |
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private function title() |
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{ |
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return $this->document->querySelector('title')->text(); |
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} |
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/** |
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* @return mixed |
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*/ |
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private function metaKeywords() |
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{ |
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$keywordsElement = $this->document->querySelector('meta[name="keywords"]'); |
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if (!$keywordsElement) { |
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return []; |
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} |
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$keywordString = $keywordsElement->attr('content'); |
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$keywords = explode(',', $keywordString); |
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return array_map(function ($word) { |
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return trim($word); |
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}, $keywords); |
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} |
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/** |
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* @param string $element |
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* @return array |
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*/ |
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private function meta($element = null) |
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{ |
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$selector = "meta"; |
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if ($element === null) { |
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$metaTags = $this->document->querySelectorAll($selector); |
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return $this->metaTagsToArray($metaTags); |
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} |
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$selector .= "[name='{$element}']"; |
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$metaTags = $this->document->querySelector($selector); |
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if ($metaTags === null) { |
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return null; |
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} |
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return $metaTags->attr('content'); |
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} |
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/** |
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* @param \Jclyons52\PHPQuery\Support\NodeCollection $metaTags |
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* @return array |
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*/ |
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private function metaTagsToArray($metaTags) |
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{ |
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$values = []; |
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foreach ($metaTags as $meta) { |
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$name = $meta->attr('name'); |
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if ($name === '') { |
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$name = $meta->attr('property'); |
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} |
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$content = $meta->attr('content'); |
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if ($name === '' || $content == '') { |
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continue; |
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} |
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$values[$name] = $content; |
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} |
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return $values; |
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} |
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/** |
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* @param $url Url |
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* @return mixed |
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*/ |
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private function formatImages($url) |
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{ |
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return array_map(function ($imageUrl) use ($url) { |
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return $url->formatRelativeToAbsolute($imageUrl); |
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}, $this->images()); |
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} |
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} |
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jclyons52 /
page-preview
