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<?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];
$ogimagetype = guess_image_type($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);
$ogdesc = rtrim(substr($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.'), $channel['channel_name']);
}
}
if(! isset($ogimage)) {
$ogimage = $channel['xchan_photo_l'];
$ogimagetype = $channel['xchan_photo_mimetype'];
}
App::$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;
}
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