82 lines
2.1 KiB
PHP
82 lines
2.1 KiB
PHP
<?php
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class pluginTwitterCard extends Plugin {
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public function siteHead()
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{
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global $Url;
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global $Site;
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global $WHERE_AM_I;
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global $pages;
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global $page;
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$data = array(
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'card' =>'summary',
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'site' =>'',
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'title' =>$Site->title(),
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'description' =>$Site->description(),
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'image' =>''
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);
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switch($WHERE_AM_I) {
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// The user filter by page
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case 'page':
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$data['title'] = $page->title();
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$data['description'] = $page->description();
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$data['image'] = $page->coverImage($absolute=true);
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$content = $page->content();
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break;
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// The user is in the homepage
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default:
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$content = '';
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// The image it's from the first page
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if(isset($pages[0]) ) {
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$data['image'] = $pages[0]->coverImage($absolute=true);
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$content = $pages[0]->content();
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}
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break;
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}
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$html = PHP_EOL.'<!-- Twitter Card -->'.PHP_EOL;
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$html .= '<meta property="twitter:card" content="'.$data['card'].'">'.PHP_EOL;
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$html .= '<meta property="twitter:site" content="'.$data['site'].'">'.PHP_EOL;
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$html .= '<meta property="twitter:title" content="'.$data['title'].'">'.PHP_EOL;
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$html .= '<meta property="twitter:description" content="'.$data['description'].'">'.PHP_EOL;
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// If the page doesn't have a coverImage try to get an image from the HTML content
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if( empty($data['image']) ) {
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// Get the image from the content
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$src = $this->getImage($content);
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if($src!==false) {
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$data['image'] = DOMAIN.$src;
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}
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}
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$html .= '<meta property="twitter:image" content="'.$data['image'].'">'.PHP_EOL;
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return $html;
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}
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// Returns the first image from the HTML content
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private function getImage($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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// 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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}
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