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;
$html = '<div>';
$html .= '<label>'.$Language->get('Default image').'</label>';
$html .= '<select name="defaultImage">';
$images = Filesystem::listFiles(PATH_UPLOADS);
foreach ($images as $image) {
$base = basename($image);
$html .= '<option value="'.$base.'" '.(($this->getValue('defaultImage')==$base)?'selected':'').'>'.$base.'</option>';
}
$html .= '</select>';
$html .= '</div>';
return $html;
}
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public function siteHead()
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{
global $Url;
global $Site;
global $WHERE_AM_I;
global $pages;
global $page;
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$og = array(
'locale' =>$Site->locale(),
'type' =>'website',
'title' =>$Site->title(),
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'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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$content = $page->content();
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break;
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// The user is in the homepage
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default:
$content = '';
// The image it's from the first page
if(isset($pages[0]) ) {
$og['image'] = $pages[0]->coverImage($absolute=true);
$content = $pages[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 = $this->getImage($content);
if ($src!==false) {
$og['image'] = $src;
} else {
$og['image'] = DOMAIN_UPLOADS.$this->getValue('defaultImage');
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}
}
$html .= '<meta property="og:image" content="'.$og['image'].'">'.PHP_EOL;
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return $html;
}
// Returns the first image from the HTML content
private function getImage($content)
{
$dom = new DOMDocument();
$dom->loadHTML('<meta http-equiv="content-type" content="text/html; charset=utf-8">'.$content);
$finder = new DomXPath($dom);
$images = $finder->query("//img");
if($images->length>0) {
// First image from the list
$image = $images->item(0);
// Get value from attribute src
$imgSrc = $image->getAttribute('src');
// Returns the image src
return $imgSrc;
}
return false;
}
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}