Update person, undo activity and improved security checks
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8c7e5bb776
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@ -43,16 +43,30 @@ use Friendica\Core\Config;
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* To-do:
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*
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* Receiver:
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* - Activities: Update (Notes, Person), Delete (Person, Activities, Notes)
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* - Object Types: Person, Tombstome
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* - Update Note
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* - Delete Note
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* - Delete Person
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* - Undo Announce
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* - Reject Follow
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* - Undo Accept
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* - Undo Follow
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* - Add
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* - Create Image
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* - Create Video
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* - Event
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* - Remove
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* - Block
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* - Flag
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*
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* Transmitter:
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* - Activities: Announce, Update (Person)
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* - Object Tyoes: Person
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* - Announce
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* - Undo Announce
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* - Update Person
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* - Reject Follow
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* - Event
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*
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* General:
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* - Queueing unsucessful deliveries
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* - Event support
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* - Polling the outboxes for missing content?
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*/
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class ActivityPub
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@ -270,7 +284,7 @@ class ActivityPub
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$exclude[] = $item['owner-link'];
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}
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$permissions = [];
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$permissions['to'][] = $actor;
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$elements = ['to', 'cc', 'bto', 'bcc'];
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foreach ($elements as $element) {
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@ -280,6 +294,7 @@ class ActivityPub
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if (is_string($activity[$element])) {
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$activity[$element] = [$activity[$element]];
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}
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foreach ($activity[$element] as $receiver) {
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if ($receiver == $profile['followers'] && !empty($item_profile['followers'])) {
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$receiver = $item_profile['followers'];
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@ -346,10 +361,13 @@ class ActivityPub
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}
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}
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// It is to decide whether we should include all profiles in a thread to the list of receivers
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/*
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$parents = Item::select(['author-link', 'owner-link', 'gravity'], ['parent' => $item['parent']]);
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while ($parent = Item::fetch($parents)) {
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// Don't include data from future posts
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if ($parent['id'] >= $item['id']) {
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continue;
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}
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$profile = self::fetchprofile($parent['author-link'], false);
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if (!empty($profile) && empty($contacts[$profile['url']])) {
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$data['cc'][] = $profile['url'];
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@ -367,7 +385,7 @@ class ActivityPub
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}
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}
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DBA::close($parents);
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*/
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if (empty($data['to'])) {
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$data['to'] = $data['cc'];
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$data['cc'] = [];
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@ -952,7 +970,7 @@ class ActivityPub
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}
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}
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private static function prepareObjectData($activity, $uid, $trust_source)
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private static function prepareObjectData($activity, $uid, &$trust_source)
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{
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$actor = JsonLD::fetchElement($activity, 'actor', 'id');
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if (empty($actor)) {
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@ -982,12 +1000,18 @@ class ActivityPub
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}
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// Fetch the content only on activities where this matters
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if (in_array($activity['type'], ['Create', 'Update', 'Announce'])) {
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if (in_array($activity['type'], ['Create', 'Announce'])) {
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$object_data = self::fetchObject($object_url, $activity['object'], $trust_source);
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if (empty($object_data)) {
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logger("Object data couldn't be processed", LOGGER_DEBUG);
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return [];
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}
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// We had been able to retrieve the object data - so we can trust the source
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$trust_source = true;
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} elseif ($activity['type'] == 'Update') {
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$object_data = [];
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$object_data['object_type'] = JsonLD::fetchElement($activity, 'object', 'type');
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$object_data['object'] = $activity['object'];
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} elseif ($activity['type'] == 'Accept') {
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$object_data = [];
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$object_data['object_type'] = JsonLD::fetchElement($activity, 'object', 'type');
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@ -995,7 +1019,11 @@ class ActivityPub
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} elseif ($activity['type'] == 'Undo') {
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$object_data = [];
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$object_data['object_type'] = JsonLD::fetchElement($activity, 'object', 'type');
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if ($object_data['object_type'] == 'Follow') {
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$object_data['object'] = JsonLD::fetchElement($activity, 'object', 'object');
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} else {
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$object_data['object'] = $activity['object'];
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}
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} elseif (in_array($activity['type'], ['Like', 'Dislike'])) {
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// Create a mostly empty array out of the activity data (instead of the object).
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// This way we later don't have to check for the existence of ech individual array element.
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@ -1045,12 +1073,17 @@ class ActivityPub
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logger('Processing activity: ' . $activity['type'], LOGGER_DEBUG);
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// $trust_source is called by reference and is set to true if the content was retrieved successfully
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$object_data = self::prepareObjectData($activity, $uid, $trust_source);
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if (empty($object_data)) {
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logger('No object data found', LOGGER_DEBUG);
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return;
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}
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if (!trust_source) {
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logger('No trust for activity type "' . $activity['type'] . '", so we quit now.', LOGGER_DEBUG);
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}
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switch ($activity['type']) {
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case 'Create':
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case 'Announce':
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@ -1066,6 +1099,9 @@ class ActivityPub
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break;
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case 'Update':
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if (in_array($object_data['object_type'], ['Person', 'Organization', 'Service', 'Group', 'Application'])) {
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self::updatePerson($object_data, $body);
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}
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break;
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case 'Delete':
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@ -1084,6 +1120,8 @@ class ActivityPub
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case 'Undo':
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if ($object_data['object_type'] == 'Follow') {
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self::undoFollowUser($object_data);
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} elseif (in_array($object_data['object_type'], ['Like', 'Dislike', 'Accept', 'Reject', 'TentativeAccept'])) {
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self::undoActivity($object_data);
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}
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break;
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@ -1553,6 +1591,15 @@ class ActivityPub
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logger('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
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}
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private static function updatePerson($activity)
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{
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if (empty($activity['object']['id'])) {
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return;
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}
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self::fetchprofile($activity['object']['id'], true);
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}
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private static function acceptFollowUser($activity)
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{
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$uid = self::getUserOfObject($activity['object']);
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@ -1580,6 +1627,26 @@ class ActivityPub
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logger('Accept contact request from contact ' . $cid . ' for user ' . $uid, LOGGER_DEBUG);
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}
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private static function undoActivity($activity)
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{
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$activity_url = JsonLD::fetchElement($activity, 'object', 'id');
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if (empty($activity_url)) {
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return;
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}
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$actor = JsonLD::fetchElement($activity, 'object', 'actor');
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if (empty($actor)) {
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return;
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}
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$author_id = Contact::getIdForURL($actor);
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if (empty($author_id)) {
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return;
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}
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Item::delete(['uri' => $activity_url, 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
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}
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private static function undoFollowUser($activity)
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{
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$uid = self::getUserOfObject($activity['object']);
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