73 lines
2.8 KiB
PHP
73 lines
2.8 KiB
PHP
<?php
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/**
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* @file include/opengraph.php
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* @brief Add Opengraph metadata and related functions.
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*/
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/**
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* @brief Adds Opengraph meta tags into HTML head
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*
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* @param array $item
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* @param array $channel
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*
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*/
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function opengraph_add_meta($item, $channel) {
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if(! empty($item)) {
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if(! empty($item['title']))
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$ogtitle = $item['title'];
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// find first image if exist
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if(preg_match("/\[[zi]mg(=[0-9]+x[0-9]+)?\]([^\[]+)/is", $item['body'], $matches)) {
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$ogimage = $matches[2];
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$ogimagetype = guess_image_type($ogimage);
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}
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// use summary as description if exist
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$ogdesc = (empty($item['summary']) ? $item['body'] : $item['summary'] );
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$ogdesc = str_replace("#^[", "[", $ogdesc);
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$ogdesc = bbcode($ogdesc, [ 'tryoembed' => false ]);
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$ogdesc = trim(html2plain($ogdesc, 0, true));
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$ogdesc = html_entity_decode($ogdesc, ENT_QUOTES, 'UTF-8');
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// remove all URLs
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$ogdesc = preg_replace("/https?\:\/\/[a-zA-Z0-9\:\/\-\?\&\;\.\=\_\~\#\%\$\!\+\,\@]+/", "", $ogdesc);
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// shorten description
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$ogdesc = substr($ogdesc, 0, 300);
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$ogdesc = str_replace("\n", " ", $ogdesc);
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while (strpos($ogdesc, " ") !== false)
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$ogdesc = str_replace(" ", " ", $ogdesc);
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$ogdesc = (strlen($ogdesc) < 298 ? $ogdesc : rtrim(substr($ogdesc, 0, strrpos($ogdesc, " ")), "?.,:;!-") . "...");
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$ogtype = "article";
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}
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if(! isset($ogdesc)) {
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if(App::$profile['about'] && perm_is_allowed($channel['channel_id'],get_observer_hash(),'view_profile')) {
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$ogdesc = App::$profile['about'];
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}
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else {
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$ogdesc = sprintf( t('This is the home page of %s.'), $channel['channel_name']);
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}
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}
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if(! isset($ogimage)) {
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$ogimage = $channel['xchan_photo_l'];
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$ogimagetype = $channel['xchan_photo_mimetype'];
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}
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App::$page['htmlhead'] .= '<meta property="og:title" content="' . htmlspecialchars((isset($ogtitle) ? $ogtitle : $channel['channel_name'])) . '">' . "\r\n";
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App::$page['htmlhead'] .= '<meta property="og:image" content="' . $ogimage . '">' . "\r\n";
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App::$page['htmlhead'] .= '<meta property="og:image:type" content="' . $ogimagetype . '">' . "\r\n";
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App::$page['htmlhead'] .= '<meta property="og:description" content="' . htmlspecialchars($ogdesc) . '">' . "\r\n";
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App::$page['htmlhead'] .= '<meta property="og:type" content="' . (isset($ogtype) ? $ogtype : "profile") . '">' . "\r\n";
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return true;
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}
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