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