126 lines
3.3 KiB
PHP
126 lines
3.3 KiB
PHP
<?php
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class pluginOpenGraph extends Plugin {
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public function init()
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{
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// Fields and default values for the database of this plugin
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$this->dbFields = array(
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'defaultImage'=>''
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);
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}
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public function form()
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{
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global $Language;
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$html = '<div>';
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$html .= '<label>'.$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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$html .= '</div>';
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/*
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$html = '<div>';
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$html .= '<label>'.$Language->get('Default image').'</label>';
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$html .= '<select name="defaultImage">';
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$images = Filesystem::listFiles(PATH_UPLOADS);
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foreach ($images as $image) {
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$base = basename($image);
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$html .= '<option value="'.$base.'" '.(($this->getValue('defaultImage')==$base)?'selected':'').'>'.$base.'</option>';
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}
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$html .= '</select>';
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$html .= '</div>';
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*/
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return $html;
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}
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public function siteHead()
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{
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global $Url;
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global $Site;
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global $WHERE_AM_I;
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global $pages;
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global $page;
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$og = array(
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'locale' =>$Site->locale(),
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'type' =>'website',
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'title' =>$Site->title(),
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'description' =>$Site->description(),
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'url' =>$Site->url(),
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'image' =>'',
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'siteName' =>$Site->title()
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);
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switch ($WHERE_AM_I) {
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// The user filter by page
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case 'page':
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$og['type'] = 'article';
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$og['title'] = $page->title();
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$og['description'] = $page->description();
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$og['url'] = $page->permalink($absolute=true);
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$og['image'] = $page->coverImage($absolute=true);
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$content = $page->content();
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break;
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// The user is in the homepage
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default:
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$content = '';
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// The image it's from the first page
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if (isset($pages[0]) ) {
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$og['image'] = $pages[0]->coverImage($absolute=true);
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$content = $pages[0]->content();
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}
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break;
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}
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$html = PHP_EOL.'<!-- Open Graph -->'.PHP_EOL;
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$html .= '<meta property="og:locale" content="'.$og['locale'].'">'.PHP_EOL;
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$html .= '<meta property="og:type" content="'.$og['type'].'">'.PHP_EOL;
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$html .= '<meta property="og:title" content="'.$og['title'].'">'.PHP_EOL;
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$html .= '<meta property="og:description" content="'.$og['description'].'">'.PHP_EOL;
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$html .= '<meta property="og:url" content="'.$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
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if (empty($og['image'])) {
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// Get the image from the content
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$src = $this->getImage($content);
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if ($src!==false) {
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$og['image'] = $src;
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} else {
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if (Text::isNotEmpty($this->getValue('defaultImage'))) {
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$og['image'] = $this->getValue('defaultImage');
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}
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}
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}
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$html .= '<meta property="og:image" content="'.$og['image'].'">'.PHP_EOL;
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return $html;
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}
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// Returns the first image from the HTML content
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private function getImage($content)
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{
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$dom = new DOMDocument();
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$dom->loadHTML('<meta http-equiv="content-type" content="text/html; charset=utf-8">'.$content);
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$finder = new DomXPath($dom);
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$images = $finder->query("//img");
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if($images->length>0) {
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// First image from the list
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$image = $images->item(0);
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// Get value from attribute src
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$imgSrc = $image->getAttribute('src');
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// Returns the image src
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return $imgSrc;
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}
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return false;
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}
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} |