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

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2017-07-11 23:53:53 +02:00
<?php
class pluginTwitterCards extends Plugin {
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public function siteHead()
{
global $Url;
global $Site;
global $WHERE_AM_I;
global $pages;
global $page;
$data = array(
'card' =>'summary',
'site' =>'',
'title' =>$Site->title(),
'description' =>$Site->description(),
'image' =>''
);
switch($WHERE_AM_I) {
// The user filter by page
case 'page':
$data['title'] = $page->title();
$data['description'] = $page->description();
$data['image'] = $page->coverImage($absolute=true);
$content = $page->content();
break;
// The user is in the homepage
default:
$content = '';
// The image it's from the first page
if(isset($pages[0]) ) {
$data['image'] = $pages[0]->coverImage($absolute=true);
$content = $pages[0]->content();
}
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 = $this->getImage($content);
if($src!==false) {
$data['image'] = DOMAIN.$src;
}
}
$html .= '<meta property="twitter:image" content="'.$data['image'].'">'.PHP_EOL;
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;
}
}