bludit/bl-plugins/twitter-cards/plugin.php

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<?php
class pluginTwitterCards extends Plugin {
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public function init()
{
// Fields and default values for the database of this plugin
$this->dbFields = array(
'defaultImage'=>''
);
}
public function form()
{
global $language;
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$html = '<div class="alert alert-primary" role="alert">';
$html .= $this->description();
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$html .= '</div>';
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$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://">';
$html .= '</div>';
return $html;
}
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public function siteHead()
{
global $url;
global $site;
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global $WHERE_AM_I;
global $content;
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global $page;
$data = array(
'card' =>'summary',
'site' =>'',
'title' =>$site->title(),
'description' =>$site->description(),
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'image' =>''
);
switch($WHERE_AM_I) {
// The user filter by page
case 'page':
$data['title'] = $page->title();
$data['description'] = $page->description();
$data['image'] = $page->coverImage($absolute=true);
$pageContent = $page->content();
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break;
// The user is in the homepage
default:
$pageContent = '';
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// The image it's from the first page
if(isset($content[0]) ) {
$data['image'] = $content[0]->coverImage($absolute=true);
$pageContent = $content[0]->content();
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}
break;
}
$html = PHP_EOL.'<!-- Twitter Cards -->'.PHP_EOL;
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$html .= '<meta property="twitter:card" content="'.$data['card'].'">'.PHP_EOL;
$html .= '<meta property="twitter:site" content="'.$data['site'].'">'.PHP_EOL;
$html .= '<meta property="twitter:title" content="'.$data['title'].'">'.PHP_EOL;
$html .= '<meta property="twitter:description" content="'.$data['description'].'">'.PHP_EOL;
// If the page doesn't have a coverImage try to get an image from the HTML content
if( empty($data['image']) ) {
// Get the image from the content
$src = DOM::getFirstImage($pageContent);
if ($src!==false) {
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$data['image'] = $src;
} else {
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if (Text::isNotEmpty($this->getValue('defaultImage'))) {
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$data['image'] = $this->getValue('defaultImage');
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}
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}
}
$html .= '<meta property="twitter:image" content="'.$data['image'].'">'.PHP_EOL;
return $html;
}
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}