+ $wellKnown = array('web', 'xmpp', 'mail', 'omb', 'system', 'api', 'ostatus',
+ 'activity', 'feed', 'mirror', 'twitter', 'facebook');
+
+ if (Event::handle('StartActivityObjectFromNoticeSource', array($source, &$object))) {
+ $object->type = ActivityObject::APPLICATION;
+
+ if (in_array($source->code, $wellKnown)) {
+ // We use one ID for all well-known StatusNet sources
+ $object->id = "tag:status.net,2009:notice-source:".$source->code;
+ } else if ($source->url) {
+ // They registered with an URL
+ $object->id = $source->url;
+ } else {
+ // Locally-registered, no URL
+ $object->id = TagURI::mint("notice-source:".$source->code);
+ }