+
+ static function getFeedAuthor($feedEl)
+ {
+ // Try old and deprecated activity:subject
+
+ $subject = ActivityUtils::child($feedEl, Activity::SUBJECT, Activity::SPEC);
+
+ if (!empty($subject)) {
+ return new ActivityObject($subject);
+ }
+
+ // Try the feed author
+
+ $author = ActivityUtils::child($feedEl, Activity::AUTHOR, Activity::ATOM);
+
+ if (!empty($author)) {
+ return new ActivityObject($author);
+ }
+
+ // Sheesh. Not a very nice feed! Let's try fingerpoken in the
+ // entries.
+
+ $entries = $feedEl->getElementsByTagNameNS(Activity::ATOM, 'entry');
+
+ if (!empty($entries) && $entries->length > 0) {
+
+ $entry = $entries->item(0);
+
+ // Try the (deprecated) activity:actor
+
+ $actor = ActivityUtils::child($entry, Activity::ACTOR, Activity::SPEC);
+
+ if (!empty($actor)) {
+ return new ActivityObject($actor);
+ }
+
+ // Try the author
+
+ $author = ActivityUtils::child($entry, Activity::AUTHOR, Activity::ATOM);
+
+ if (!empty($author)) {
+ return new ActivityObject($author);
+ }
+ }
+
+ return null;
+ }
+
+ static function compareTypes($type, $objects)
+ {
+ $type = self::resolveUri($type);
+ foreach ((array)$objects as $object) {
+ if ($type === self::resolveUri($object)) {
+ return true;
+ }
+ }
+ return false;
+ }
+
+ static function compareVerbs($type, $objects)
+ {
+ return self::compareTypes($type, $objects);
+ }
+
+ static function resolveUri($uri, $make_relative=false)
+ {
+ if (empty($uri)) {
+ throw new ServerException('No URI to resolve in ActivityUtils::resolveUri');
+ }
+
+ if (!$make_relative && parse_url($uri, PHP_URL_SCHEME) == '') { // relative -> absolute
+ $uri = Activity::SCHEMA . $uri;
+ } elseif ($make_relative) { // absolute -> relative
+ $uri = basename($uri); //preg_replace('/^http:\/\/activitystrea\.ms\/schema\/1\.0\//', '', $uri);
+ } // absolute schemas pass through unharmed
+
+ return $uri;
+ }
+
+ static function findLocalObject(array $uris, $type=ActivityObject::NOTE) {
+ $obj_class = null;
+ // TODO: Extend this in plugins etc. and describe in EVENTS.txt
+ if (Event::handle('StartFindLocalActivityObject', array($uris, $type, &$obj_class))) {
+ switch (self::resolveUri($type)) {
+ case ActivityObject::PERSON:
+ // GROUP will also be here in due time...
+ $obj_class = 'Profile';
+ break;
+ default:
+ $obj_class = 'Notice';
+ }
+ }
+ $object = null;
+ $uris = array_unique($uris);
+ foreach ($uris as $uri) {
+ try {
+ // the exception thrown will cancel before reaching $object
+ $object = call_user_func("{$obj_class}::fromUri", $uri);
+ break;
+ } catch (UnknownUriException $e) {
+ common_debug('Could not find local activity object from uri: '.$e->object_uri);
+ }
+ }
+ if (!$object instanceof Managed_DataObject) {
+ throw new ServerException('Could not find any activityobject stored locally with given URIs: '.var_export($uris,true));
+ }
+ Event::handle('EndFindLocalActivityObject', array($object->getUri(), $object->getObjectType(), $object));
+ return $object;
+ }
+
+ // Check authorship by supplying a Profile as a default and letting plugins
+ // set it to something else if the activity's author is actually someone
+ // else (like with a group or peopletag feed as handled in OStatus).
+ //
+ // NOTE: Returned is not necessarily the supplied profile! For example,
+ // the "feed author" may be a group, but the "activity author" is a person!
+ static function checkAuthorship(Activity $activity, Profile $profile)
+ {
+ if (Event::handle('CheckActivityAuthorship', array($activity, &$profile))) {
+ // if (empty($activity->actor)), then we generated this Activity ourselves and can trust $profile
+
+ $actor_uri = $profile->getUri();
+
+ if (!in_array($actor_uri, array($activity->actor->id, $activity->actor->link))) {
+ // A mismatch between our locally stored URI and the supplied author?
+ // Probably not more than a blog feed or something (with multiple authors or so)
+ // but log it for future inspection.
+ common_log(LOG_WARNING, "Got an actor '{$activity->actor->title}' ({$activity->actor->id}) on single-user feed for " . $actor_uri);
+ } elseif (empty($activity->actor->id)) {
+ // Plain <author> without ActivityStreams actor info.
+ // We'll just ignore this info for now and save the update under the feed's identity.
+ }
+ }
+
+ if (!$profile instanceof Profile) {
+ throw new ServerException('Could not get an author Profile for activity');
+ }
+
+ return $profile;
+ }
+
+ static public function typeToTitle($type)
+ {
+ return ucfirst(self::resolveUri($type, true));
+ }
+
+ static public function verbToTitle($verb)
+ {
+ return ucfirst(self::resolveUri($verb, true));
+ }