100 lines
2.7 KiB
PHP
100 lines
2.7 KiB
PHP
<?php
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class pluginOpenGraph extends Plugin {
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// Returns the first image from the HTML content
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private function getImage($content)
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{
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$dom = new DOMDocument();
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$dom->loadHTML('<meta http-equiv="content-type" content="text/html; charset=utf-8">'.$content);
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$finder = new DomXPath($dom);
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$images = $finder->query("//img");
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if($images->length>0)
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{
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// First image from the list
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$image = $images->item(0);
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// Get value from attribute src
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$imgSrc = $image->getAttribute('src');
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// Returns the image src
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return $imgSrc;
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}
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return false;
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}
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public function siteHead()
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{
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global $Url, $Site;
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global $Post, $Page, $posts;
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$og = array(
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'locale' =>$Site->locale(),
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'type' =>'website',
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'title' =>$Site->title(),
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'description' =>$Site->description(),
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'url' =>$Site->url(),
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'image' =>'',
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'siteName' =>$Site->title()
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);
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switch($Url->whereAmI())
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{
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// The user filter by post
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case 'post':
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$og['type'] = 'article';
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$og['title'] = $Post->title().' | '.$og['title'];
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$og['description'] = $Post->description();
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$og['url'] = $Post->permalink(true);
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$og['image'] = $Post->coverImage(false);
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$content = $Post->content();
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break;
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// The user filter by page
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case 'page':
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$og['type'] = 'article';
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$og['title'] = $Page->title().' | '.$og['title'];
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$og['description'] = $Page->description();
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$og['url'] = $Page->permalink(true);
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$og['image'] = $Page->coverImage(false);
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$content = $Page->content();
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break;
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// The user is in the homepage
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default:
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// The image it's from the first post
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if(isset($posts[0])) {
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$og['image'] = $posts[0]->coverImage(false);
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$content = $posts[0]->content();
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}
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break;
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}
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$html = PHP_EOL.'<!-- Open Graph -->'.PHP_EOL;
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$html .= '<meta property="og:locale" content="'.$og['locale'].'">'.PHP_EOL;
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$html .= '<meta property="og:type" content="'.$og['type'].'">'.PHP_EOL;
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$html .= '<meta property="og:title" content="'.$og['title'].'">'.PHP_EOL;
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$html .= '<meta property="og:description" content="'.$og['description'].'">'.PHP_EOL;
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$html .= '<meta property="og:url" content="'.$og['url'].'">'.PHP_EOL;
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$html .= '<meta property="og:siteName" content="'.$og['siteName'].'">'.PHP_EOL;
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// If the post o page doesn't have a coverImage try to get an image from the HTML content
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if($og['image']===false) {
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// Get the image from the content
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$src = $this->getImage( $content );
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if($src!==false) {
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$html .= '<meta property="og:image" content="'.DOMAIN.$src.'">'.PHP_EOL;
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}
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}
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else {
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$html .= '<meta property="og:image" content="'.DOMAIN_UPLOADS.$og['image'].'">'.PHP_EOL;
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}
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return $html;
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}
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} |