<?php class pluginOpenGraph extends Plugin { public function init() { // Fields and default values for the database of this plugin $this->dbFields = array( 'defaultImage'=>'' ); } public function form() { global $L; $html = '<div class="alert alert-primary" role="alert">'; $html .= $this->description(); $html .= '</div>'; $html .= '<div>'; $html .= '<label>'.$L->get('Default image').'</label>'; $html .= '<input id="jsdefaultImage" name="defaultImage" type="text" value="'.$this->getValue('defaultImage').'" placeholder="https://">'; $html .= '<span class="tip">Set a default image for the content without pictures.</span>'; $html .= '</div>'; return $html; } public function siteHead() { global $url; global $site; global $WHERE_AM_I; global $page; global $content; $og = array( 'locale' =>$site->locale(), 'type' =>'website', 'title' =>$site->title(), 'description' =>$site->description(), 'url' =>$site->url(), 'image' =>'', 'siteName' =>$site->title() ); switch ($WHERE_AM_I) { // The user filter by page case 'page': $og['type'] = 'article'; $og['title'] = $page->title(); $og['description'] = $page->description(); $og['url'] = $page->permalink($absolute=true); $og['image'] = $page->coverImage($absolute=true); $pageContent = $page->content(); break; // The user is in the homepage default: $pageContent = ''; // The image it's from the first page if (isset($content[0]) ) { $og['image'] = $content[0]->coverImage($absolute=true); $pageContent = $content[0]->content(); } break; } $html = PHP_EOL.'<!-- Open Graph -->'.PHP_EOL; $html .= '<meta property="og:locale" content="'.$og['locale'].'">'.PHP_EOL; $html .= '<meta property="og:type" content="'.$og['type'].'">'.PHP_EOL; $html .= '<meta property="og:title" content="'.$og['title'].'">'.PHP_EOL; $html .= '<meta property="og:description" content="'.$og['description'].'">'.PHP_EOL; $html .= '<meta property="og:url" content="'.$og['url'].'">'.PHP_EOL; $html .= '<meta property="og:siteName" content="'.$og['siteName'].'">'.PHP_EOL; // If the page doesn't have a coverImage try to get an image from the HTML content if (empty($og['image'])) { // Get the image from the content $src = DOM::getFirstImage($pageContent); if ($src!==false) { $og['image'] = $src; } else { if (Text::isNotEmpty($this->getValue('defaultImage'))) { $og['image'] = $this->getValue('defaultImage'); } } } $html .= '<meta property="og:image" content="'.$og['image'].'">'.PHP_EOL; return $html; } }