bludit/bl-plugins/opengraph/plugin.php

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