101 lines
3.2 KiB
PHP
101 lines
3.2 KiB
PHP
<?php
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class pluginOpenGraph extends Plugin
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{
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public function init()
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{
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// Fields and default values for the database of this plugin
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$this->dbFields = array(
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'defaultImage' => ''
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);
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}
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public function form()
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{
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global $L;
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$html = '<div>';
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$html .= '<label>' . $L->get('Default image') . '</label>';
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$html .= '<input id="jsdefaultImage" name="defaultImage" type="text" dir="auto" value="' . $this->getValue('defaultImage') . '" placeholder="https://">';
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$html .= '<span class="tip">' . $L->g('set-a-default-image-for-content') . '</span>';
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$html .= '</div>';
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return $html;
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}
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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 $page;
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global $content;
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$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' => $site->title(),
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'card' => 'summary',
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);
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switch ($WHERE_AM_I) {
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// The user filter by page
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case 'page':
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$og['type'] = 'article';
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$og['title'] = $page->title();
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$og['description'] = $page->description();
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$og['url'] = $page->permalink($absolute = true);
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$og['image'] = $page->coverImage($absolute = true);
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$pageContent = $page->content();
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break;
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// The user is in the homepage
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default:
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$pageContent = '';
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if (Text::isNotEmpty($this->getValue('defaultImage'))) {
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$og['image'] = $this->getValue('defaultImage');
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} elseif (isset($content[0])) {
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$og['image'] = $content[0]->coverImage($absolute = true);
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$pageContent = $content[0]->content();
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}
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break;
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}
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$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:site_name" content="' . $og['siteName'] . '">' . PHP_EOL;
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$html .= PHP_EOL . '<!-- Twitter Cards -->' . PHP_EOL;
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$html .= '<meta property="twitter:card" content="' . $og['card'] . '">' . PHP_EOL;
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$html .= '<meta property="twitter:site" content="' . $og['siteName'] . '">' . PHP_EOL;
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$html .= '<meta property="twitter:title" content="' . $og['title'] . '">' . PHP_EOL;
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$html .= '<meta property="twitter:description" content="' . $og['description'] . '">' . PHP_EOL;
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// If the page doesn't have a coverImage try to get an image from the HTML content
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if (empty($og['image'])) {
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// Get the image from the content
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$src = DOM::getFirstImage($pageContent);
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if ($src !== false) {
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$og['image'] = $src;
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} else {
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if (Text::isNotEmpty($this->getValue('defaultImage'))) {
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$og['image'] = $this->getValue('defaultImage');
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}
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}
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}
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$html .= '<meta property="og:image" content="' . $og['image'] . '">' . PHP_EOL;
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$html .= '<meta property="twitter:image" content="' . $og['image'] . '">' . PHP_EOL;
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return $html;
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}
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}
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