bludit/bl-plugins/opengraph/plugin.php

88 lines
2.3 KiB
PHP

<?php
class pluginOpenGraph extends Plugin {
// 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;
}
public function siteHead()
{
global $Url;
global $Site;
global $WHERE_AM_I;
global $pages;
global $page;
$og = array(
'locale' =>$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);
$content = $page->content();
break;
// The user is in the homepage
default:
// The image it's from the first page
if(isset($pages[0]) ) {
$og['image'] = $pages[0]->coverImage($absolute=true);
$content = $pages[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;
$html .= '<meta property="og:siteName" content="'.$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 = $this->getImage($content);
if($src!==false) {
$og['image'] = DOMAIN.$src;
}
}
$html .= '<meta property="og:image" content="'.$og['image'].'">'.PHP_EOL;
return $html;
}
}