<?php class pluginOpenGraph extends Plugin { public function init() { // Fields and default values for the database of this plugin $this->dbFields = array( 'defaultImage' => '', 'fbAppId' => '' ); } 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" dir="auto" value="' . $this->getValue('defaultImage') . '" placeholder="https://">'; $html .= '<span class="tip">' . $L->g('set-a-default-image-for-content') . '</span>'; $html .= '</div>'; $html .= '<div>'; $html .= '<label>' . $L->get('Facebook App ID') . '</label>'; $html .= '<input name="fbAppId" type="text" dir="auto" value="' . $this->getValue('fbAppId') . '" placeholder="App ID">'; $html .= '<span class="tip">' . $L->g('set-your-facebook-app-id') . '</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: $pageContent = ''; if (Text::isNotEmpty($this->getValue('defaultImage'))) { $og['image'] = $this->getValue('defaultImage'); } elseif (isset($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:site_name" 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="' . $og['image'] . '">' . PHP_EOL; if (Text::isNotEmpty($this->getValue('fbAppId'))) { $html .= '<meta property="fb:app_id" content="' . $this->getValue('fbAppId') . '">' . PHP_EOL; } return $html; } }