diff options
| -rw-r--r-- | include/opengraph.php | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/include/opengraph.php b/include/opengraph.php new file mode 100644 index 000000000..b177673ac --- /dev/null +++ b/include/opengraph.php @@ -0,0 +1,68 @@ +<?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 $profile + * + */ + + function opengraph_add_meta($item, $profile) { + + if(! empty($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]; + + // 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(" ", " ", $ogdesc); + if (substr($ogdesc, -1) != "\n") + $ogdesc = rtrim(substr($ogdesc, 0, strrpos($ogdesc, " ")), "?.,:;!-") . "..."; + + $ogtype = "article"; + } + + $channel = channelx_by_n($profile['profile_uid']); + + if(! isset($ogdesc)) { + if($profile['about'] && perm_is_allowed($channel['channel_id'],get_observer_hash(),'view_profile')) { + $ogdesc = $profile['about']; + } + else { + $ogdesc = sprintf( t('This is the home page of %s.'), $channel['channel_name']); + } + } + + App::$page['htmlhead'] .= '<meta property="og:title" content="' . htmlspecialchars((isset($ogtitle) ? $ogtitle : $channel['channel_name'])) . '">' . "\r\n"; + App::$page['htmlhead'] .= '<meta property="og:image" content="' . (isset($ogimage) ? $ogimage : $channel['xchan_photo_l']) . '">' . "\r\n"; + App::$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; + } +
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