]> git.mxchange.org Git - friendica.git/blobdiff - src/Protocol/ActivityPub/Receiver.php
Merge pull request #13724 from Raroun/Fix-for-Issue-#13637---Photo-caption-prevents...
[friendica.git] / src / Protocol / ActivityPub / Receiver.php
index 60846dcdb857f6b13d38874b8065810e1c46780b..ff78f0db82dbe0b574c5e33115a1f80dacff5256 100644 (file)
@@ -73,12 +73,14 @@ class Receiver
        const TARGET_FOLLOWER = 5;
        const TARGET_ANSWER = 6;
        const TARGET_GLOBAL = 7;
+       const TARGET_AUDIENCE = 8;
 
        const COMPLETION_NONE     = 0;
        const COMPLETION_ANNOUNCE = 1;
        const COMPLETION_RELAY    = 2;
        const COMPLETION_MANUAL   = 3;
        const COMPLETION_AUTO     = 4;
+       const COMPLETION_ASYNC    = 5;
 
        /**
         * Checks incoming message from the inbox
@@ -106,7 +108,7 @@ class Receiver
                if (empty($apcontact)) {
                        Logger::notice('Unable to retrieve AP contact for actor - message is discarded', ['actor' => $actor]);
                        return;
-               } elseif (APContact::isRelay($apcontact)) {
+               } elseif (APContact::isRelay($apcontact) && self::isRelayPost($ldactivity)) {
                        self::processRelayPost($ldactivity, $actor);
                        return;
                } else {
@@ -114,7 +116,7 @@ class Receiver
                }
 
                $sig_contact = HTTPSignature::getKeyIdContact($header);
-               if (APContact::isRelay($sig_contact)) {
+               if (APContact::isRelay($sig_contact) && self::isRelayPost($ldactivity)) {
                        Logger::info('Message from a relay', ['url' => $sig_contact['url']]);
                        self::processRelayPost($ldactivity, $sig_contact['url']);
                        return;
@@ -168,26 +170,23 @@ class Receiver
        }
 
        /**
-        * Process incoming posts from relays
+        * Check if the activity is a post rhat can be send via a relay
         *
-        * @param array  $activity
-        * @param string $actor
-        * @return void
+        * @param array $activity
+        * @return boolean
         */
-       private static function processRelayPost(array $activity, string $actor)
+       private static function isRelayPost(array $activity): bool
        {
                $type = JsonLD::fetchElement($activity, '@type');
                if (!$type) {
-                       Logger::notice('Empty type', ['activity' => $activity, 'actor' => $actor]);
-                       return;
+                       return false;
                }
 
                $object_type = JsonLD::fetchElement($activity, 'as:object', '@type') ?? '';
 
                $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
                if (empty($object_id)) {
-                       Logger::notice('No object id found', ['type' => $type, 'object_type' => $object_type, 'actor' => $actor, 'activity' => $activity]);
-                       return;
+                       return false;
                }
 
                $handle = ($type == 'as:Announce');
@@ -195,26 +194,29 @@ class Receiver
                if (!$handle && in_array($type, ['as:Create', 'as:Update'])) {
                        $handle = in_array($object_type, self::CONTENT_TYPES);
                }
+               return $handle;
+       }
 
-               if (!$handle) {
-                       $trust_source = false;
-                       $object_data = self::prepareObjectData($activity, 0, false, $trust_source);
-
-                       if (!$trust_source) {
-                               Logger::notice('Activity trust could not be achieved.',  ['type' => $type, 'object_type' => $object_type, 'object_id' => $object_id, 'actor' => $actor, 'activity' => $activity]);
-                               return;
-                       }
+       /**
+        * Process incoming posts from relays
+        *
+        * @param array  $activity
+        * @param string $actor
+        * @return void
+        */
+       private static function processRelayPost(array $activity, string $actor)
+       {
+               $type = JsonLD::fetchElement($activity, '@type');
+               if (!$type) {
+                       Logger::notice('Empty type', ['activity' => $activity, 'actor' => $actor]);
+                       return;
+               }
 
-                       if (empty($object_data)) {
-                               Logger::notice('No object data found', ['type' => $type, 'object_type' => $object_type, 'object_id' => $object_id, 'actor' => $actor, 'activity' => $activity]);
-                               return;
-                       }
+               $object_type = JsonLD::fetchElement($activity, 'as:object', '@type') ?? '';
 
-                       if (self::routeActivities($object_data, $type, true)) {
-                               Logger::debug('Handled activity', ['type' => $type, 'object_type' => $object_type, 'object_id' => $object_id, 'actor' => $actor]);
-                       } else {
-                               Logger::info('Unhandled activity', ['type' => $type, 'object_type' => $object_type, 'object_id' => $object_id, 'actor' => $actor, 'activity' => $activity]);
-                       }
+               $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
+               if (empty($object_id)) {
+                       Logger::notice('No object id found', ['type' => $type, 'object_type' => $object_type, 'actor' => $actor, 'activity' => $activity]);
                        return;
                }
 
@@ -229,7 +231,7 @@ class Receiver
                        return;
                }
 
-               Logger::debug('Got relayed message id', ['id' => $object_id, 'actor' => $actor]);
+               Logger::debug('Process post from relay server', ['type' => $type, 'object_type' => $object_type, 'object_id' => $object_id, 'actor' => $actor]);
 
                $item_id = Item::searchByLink($object_id);
                if ($item_id) {
@@ -237,10 +239,21 @@ class Receiver
                        return;
                }
 
-               $id = Processor::fetchMissingActivity($object_id, [], $actor, self::COMPLETION_RELAY);
-               if (empty($id)) {
-                       Logger::notice('Relayed message had not been fetched', ['id' => $object_id, 'actor' => $actor]);
-                       return;
+               if (!DI::config()->get('system', 'decoupled_receiver')) {
+                       $id = Processor::fetchMissingActivity($object_id, [], $actor, self::COMPLETION_RELAY);
+                       if (!empty($id)) {
+                               Logger::notice('Relayed message is fetched', ['result' => $id, 'id' => $object_id, 'actor' => $actor]);
+                       } else {
+                               Logger::notice('Relayed message had not been fetched', ['id' => $object_id, 'actor' => $actor, 'activity' => $activity]);
+                       }
+               } elseif (!Fetch::hasWorker($object_id)) {
+                       Logger::notice('Fetching is done by worker.', ['id' => $object_id]);
+                       Fetch::add($object_id);
+                       $activity['recursion-depth'] = 0;
+                       $wid = Worker::add(Worker::PRIORITY_HIGH, 'FetchMissingActivity', $object_id, [], $actor, self::COMPLETION_RELAY);
+                       Fetch::setWorkerId($object_id, $wid);
+               } else {
+                       Logger::debug('Activity will already be fetched via a worker.', ['url' => $object_id]);
                }
        }
 
@@ -248,7 +261,7 @@ class Receiver
         * Fetches the object type for a given object id
         *
         * @param array   $activity
-        * @param string  $object_id Object ID of the the provided object
+        * @param string  $object_id Object ID of the provided object
         * @param integer $uid       User ID
         *
         * @return string with object type or NULL
@@ -290,16 +303,17 @@ class Receiver
        /**
         * Prepare the object array
         *
-        * @param array   $activity     Array with activity data
-        * @param integer $uid          User ID
-        * @param boolean $push         Message had been pushed to our system
-        * @param boolean $trust_source Do we trust the source?
+        * @param array   $activity       Array with activity data
+        * @param integer $uid            User ID
+        * @param boolean $push           Message had been pushed to our system
+        * @param boolean $trust_source   Do we trust the source?
+        * @param string  $original_actor Actor of the original activity. Used for receiver detection. (Optional)
         *
         * @return array with object data
         * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         * @throws \ImagickException
         */
-       public static function prepareObjectData(array $activity, int $uid, bool $push, bool &$trust_source): array
+       public static function prepareObjectData(array $activity, int $uid, bool $push, bool &$trust_source, string $original_actor = ''): array
        {
                $id        = JsonLD::fetchElement($activity, '@id');
                $type      = JsonLD::fetchElement($activity, '@type');
@@ -318,7 +332,7 @@ class Receiver
                $fetched = false;
 
                if (!empty($id) && !$trust_source) {
-                       $fetch_uid = $uid ?: self::getBestUserForActivity($activity);
+                       $fetch_uid = $uid ?: self::getBestUserForActivity($activity, $original_actor);
 
                        $fetched_activity = Processor::fetchCachedActivity($fetch_id, $fetch_uid);
                        if (!empty($fetched_activity)) {
@@ -354,7 +368,7 @@ class Receiver
                $type = JsonLD::fetchElement($activity, '@type');
 
                // Fetch all receivers from to, cc, bto and bcc
-               $receiverdata = self::getReceivers($activity, $actor, [], false, $push || $fetched);
+               $receiverdata = self::getReceivers($activity, $original_actor ?: $actor, [], false, $push || $fetched);
                $receivers = $reception_types = [];
                foreach ($receiverdata as $key => $data) {
                        $receivers[$key] = $data['uid'];
@@ -378,7 +392,7 @@ class Receiver
 
                // We possibly need some user to fetch private content,
                // so we fetch one out of the receivers if no uid is provided.
-               $fetch_uid = $uid ?: self::getBestUserForActivity($activity);
+               $fetch_uid = $uid ?: self::getBestUserForActivity($activity, $original_actor);
 
                $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
                if (empty($object_id)) {
@@ -393,21 +407,6 @@ class Receiver
 
                $object_type = self::fetchObjectType($activity, $object_id, $fetch_uid);
 
-               // Fetch the activity on Lemmy "Announce" messages (announces of activities)
-               if (($type == 'as:Announce') && in_array($object_type, array_merge(self::ACTIVITY_TYPES, ['as:Delete', 'as:Undo', 'as:Update']))) {
-                       Logger::debug('Fetch announced activity', ['object' => $object_id]);
-                       $data = Processor::fetchCachedActivity($object_id, $fetch_uid);
-                       if (!empty($data)) {
-                               $type = $object_type;
-                               $activity = JsonLD::compact($data);
-
-                               // Some variables need to be refetched since the activity changed
-                               $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
-                               $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
-                               $object_type = self::fetchObjectType($activity, $object_id, $fetch_uid);
-                       }
-               }
-
                // Any activities on account types must not be altered
                if (in_array($type, ['as:Flag'])) {
                        $object_data = [];
@@ -437,16 +436,16 @@ class Receiver
 
                        $object_data['object_id'] = $object_id;
 
-                       // Test if it is an answer to a mail
-                       if (DBA::exists('mail', ['uri' => $object_data['reply-to-id']])) {
+                       // Test if it is a direct message
+                       if (self::checkForDirectMessage($object_data, $activity)) {
                                $object_data['directmessage'] = true;
-                       } else {
-                               $object_data['directmessage'] = JsonLD::fetchElement($activity, 'litepub:directMessage');
+                       } elseif (!empty(JsonLD::fetchElement($activity['as:object'], 'misskey:_misskey_talk'))) {
+                               $object_data = self::setChatData($object_data, $receivers);
                        }
                } elseif (in_array($type, array_merge(self::ACTIVITY_TYPES, ['as:Announce', 'as:Follow'])) && in_array($object_type, self::CONTENT_TYPES)) {
                        // Create a mostly empty array out of the activity data (instead of the object).
                        // This way we later don't have to check for the existence of each individual array element.
-                       $object_data = self::processObject($activity);
+                       $object_data = self::processObject($activity, $original_actor);
                        $object_data['name'] = $type;
                        $object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
                        $object_data['object_id'] = $object_id;
@@ -487,7 +486,7 @@ class Receiver
                        $object_data['object_type'] = $object_type;
                }
 
-               foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
+               foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc', 'as:audience', 'as:attributedTo'] as $element) {
                        if ((empty($object_data['receiver_urls'][$element]) || in_array($element, ['as:bto', 'as:bcc'])) && !empty($urls[$element])) {
                                $object_data['receiver_urls'][$element] = array_unique(array_merge($object_data['receiver_urls'][$element] ?? [], $urls[$element]));
                        }
@@ -499,19 +498,6 @@ class Receiver
                $object_data['receiver'] = array_replace($object_data['receiver'] ?? [], $receivers);
                $object_data['reception_type'] = array_replace($object_data['reception_type'] ?? [], $reception_types);
 
-//             This check here interferes with Hubzilla posts where the author host differs from the host the post was created
-//             $author = $object_data['author'] ?? $actor;
-//             if (!empty($author) && !empty($object_data['id'])) {
-//                     $author_host = parse_url($author, PHP_URL_HOST);
-//                     $id_host = parse_url($object_data['id'], PHP_URL_HOST);
-//                     if ($author_host == $id_host) {
-//                             Logger::info('Valid hosts', ['type' => $type, 'host' => $id_host]);
-//                     } else {
-//                             Logger::notice('Differing hosts on author and id', ['type' => $type, 'author' => $author_host, 'id' => $id_host]);
-//                             $trust_source = false;
-//                     }
-//             }
-
                $account = Contact::selectFirstAccount(['platform'], ['nurl' => Strings::normaliseLink($actor)]);
                $platform = $account['platform'] ?? '';
 
@@ -520,6 +506,77 @@ class Receiver
                return $object_data;
        }
 
+       /**
+        * Check if the received message is a direct message
+        *
+        * @param array $object_data
+        * @param array $activity
+        * @return boolean
+        */
+       private static function checkForDirectMessage(array $object_data, array $activity): bool
+       {
+               if (DBA::exists('mail', ['uri' => $object_data['reply-to-id']])) {
+                       return true;
+               }
+
+               if ($object_data['id'] != $object_data['reply-to-id']) {
+                       return false;
+               }
+
+               if (JsonLD::fetchElement($activity, 'litepub:directMessage')) {
+                       return true;
+               }
+
+               if (!empty($object_data['attachments'])) {
+                       return false;
+               }
+
+               if (!empty($object_data['receiver_urls']['as:cc']) || empty($object_data['receiver_urls']['as:to'])) {
+                       return false;
+               }
+
+               if ((count($object_data['receiver_urls']['as:to']) != 1) || !User::getIdForURL($object_data['receiver_urls']['as:to'][0])) {
+                       return false;
+               }
+
+               $mentions = 0;
+               foreach ($object_data['tags'] as $mention) {
+                       if ($mention['type'] != 'Mention') {
+                               continue;
+                       }
+                       if (!User::getIdForURL($mention['href'])) {
+                               return false;
+                       }
+                       ++$mentions;
+               }
+
+               if ($mentions > 1) {
+                       return false;
+               }
+
+               return true;
+       }
+
+       private static function setChatData(array $object_data, array $receivers): array
+       {
+               if (count($receivers) != 1) {
+                       return $object_data;
+               }
+
+               $user = User::getById(array_key_first($receivers), ['language']);
+               $l10n = DI::l10n()->withLang($user['language']);
+               $object_data['name'] = $l10n->t('Chat');
+
+               $mail = DBA::selectFirst('mail', ['uri'], ['uid' => array_key_first($receivers), 'title' => $object_data['name']], ['order' => ['id' => true]]);
+               if (!empty($mail['uri'])) {
+                       $object_data['reply-to-id'] = $mail['uri'];
+               }
+
+               $object_data['directmessage'] = true;
+               Logger::debug('Got Misskey Chat');
+               return $object_data;
+       }
+
        /**
         * Fetches the first user id from the receiver array
         *
@@ -590,20 +647,34 @@ class Receiver
                        }
                }
 
+               // Lemmy announces activities.
+               // To simplify the further processing, we modify the received object.
+               // For announced "create" activities we remove the middle layer.
+               // For the rest (like, dislike, update, ...) we just process the activity directly.
+               $original_actor = '';
+               $object_type = JsonLD::fetchElement($activity['as:object'] ?? [], '@type');
+               if (($type == 'as:Announce') && !empty($object_type) && !in_array($object_type, self::CONTENT_TYPES) && self::isGroup($actor)) {
+                       $object_object_type = JsonLD::fetchElement($activity['as:object']['as:object'] ?? [], '@type');
+                       if (in_array($object_type, ['as:Create']) && in_array($object_object_type, self::CONTENT_TYPES)) {
+                               Logger::debug('Replace "create" activity with inner object', ['type' => $object_type, 'object_type' => $object_object_type]);
+                               $activity['as:object'] = $activity['as:object']['as:object'];
+                       } elseif (in_array($object_type, array_merge(self::ACTIVITY_TYPES, ['as:Delete', 'as:Undo', 'as:Update']))) {
+                               Logger::debug('Change announced activity to activity', ['type' => $object_type]);
+                               $original_actor = $actor;
+                               $type = $object_type;
+                               $activity = $activity['as:object'];
+                       } else {
+                               Logger::info('Unhandled announced activity', ['type' => $object_type, 'object_type' => $object_object_type]);
+                       }
+               }
+
                // $trust_source is called by reference and is set to true if the content was retrieved successfully
-               $object_data = self::prepareObjectData($activity, $uid, $push, $trust_source);
+               $object_data = self::prepareObjectData($activity, $uid, $push, $trust_source, $original_actor);
                if (empty($object_data)) {
                        Logger::info('No object data found', ['activity' => $activity]);
                        return true;
                }
 
-               // Lemmy is announcing activities.
-               // We are changing the announces into regular activities.
-               if (($type == 'as:Announce') && in_array($object_data['type'] ?? '', array_merge(self::ACTIVITY_TYPES, ['as:Delete', 'as:Undo', 'as:Update']))) {
-                       Logger::debug('Change type of announce to activity', ['type' => $object_data['type']]);
-                       $type = $object_data['type'];
-               }
-
                if (!empty($body) && empty($object_data['raw'])) {
                        $object_data['raw'] = $body;
                }
@@ -630,7 +701,7 @@ class Receiver
                        $object_data['object_activity'] = $activity;
                }
 
-               if (($type == 'as:Create') && $trust_source) {
+               if (($type == 'as:Create') && $trust_source && !in_array($completion, [self::COMPLETION_MANUAL, self::COMPLETION_ANNOUNCE])) {
                        if (self::hasArrived($object_data['object_id'])) {
                                Logger::info('The activity already arrived.', ['id' => $object_data['object_id']]);
                                return true;
@@ -641,9 +712,11 @@ class Receiver
                                Logger::info('The activity is already added.', ['id' => $object_data['object_id']]);
                                return true;
                        }
+               } elseif (($type == 'as:Create') && $trust_source && !self::hasArrived($object_data['object_id'])) {
+                       self::addArrivedId($object_data['object_id']);
                }
 
-               $decouple = DI::config()->get('system', 'decoupled_receiver') && !in_array($completion, [self::COMPLETION_MANUAL, self::COMPLETION_ANNOUNCE]);
+               $decouple = DI::config()->get('system', 'decoupled_receiver') && !in_array($completion, [self::COMPLETION_MANUAL, self::COMPLETION_ANNOUNCE]) && empty($object_data['directmessage']);
 
                if ($decouple && ($trust_source || DI::config()->get('debug', 'ap_inbox_store_untrusted'))) {
                        $object_data = Queue::add($object_data, $type, $uid, $http_signer, $push, $trust_source);
@@ -654,7 +727,7 @@ class Receiver
                        return true;
                }
 
-               if (!empty($object_data['entry-id']) && $decouple && ($push || ($completion == self::COMPLETION_RELAY))) {
+               if (!empty($object_data['entry-id']) && $decouple && ($push || in_array($completion, [self::COMPLETION_RELAY, self::COMPLETION_ASYNC]))) {
                        if (Queue::isProcessable($object_data['entry-id'])) {
                                // We delay by 5 seconds to allow to accumulate all receivers
                                $delayed = date(DateTimeFormat::MYSQL, time() + 5);
@@ -678,6 +751,18 @@ class Receiver
                return true;
        }
 
+       /**
+        * Checks if the provided actor is a group account
+        *
+        * @param string $actor
+        * @return boolean
+        */
+       private static function isGroup(string $actor): bool
+       {
+               $profile = APContact::getByURL($actor);
+               return ($profile['type'] ?? '') == 'Group';
+       }
+
        /**
         * Route activities
         *
@@ -962,7 +1047,7 @@ class Receiver
         * @param boolean $unknown      "true" if the activity is unknown, "false" if it is unhandled
         * @param string  $type         Activity type
         * @param array   $object_data  Preprocessed array that is generated out of the received activity
-        * @param array   $activity     Array with activity data
+        * @param array   $activity     Array with activity data
         * @param string  $body         The unprocessed body
         * @param integer $uid          User ID
         * @param boolean $trust_source Do we trust the source?
@@ -999,10 +1084,10 @@ class Receiver
         *
         * @return int   user id
         */
-       public static function getBestUserForActivity(array $activity): int
+       private static function getBestUserForActivity(array $activity, string $actor): int
        {
                $uid = 0;
-               $actor = JsonLD::fetchElement($activity, 'as:actor', '@id') ?? '';
+               $actor = $actor ?: JsonLD::fetchElement($activity, 'as:actor', '@id') ?? '';
 
                $receivers = self::getReceivers($activity, $actor, [], false, false);
                foreach ($receivers as $receiver) {
@@ -1030,7 +1115,7 @@ class Receiver
        {
                $urls = [];
 
-               foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
+               foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc', 'as:audience', 'as:attributedTo'] as $element) {
                        $receiver_list = JsonLD::fetchElementArray($activity, $element, '@id');
                        if (empty($receiver_list)) {
                                continue;
@@ -1038,7 +1123,7 @@ class Receiver
 
                        foreach ($receiver_list as $receiver) {
                                if ($receiver == 'Public') {
-                                       Logger::warning('Not compacted public collection found', ['activity' => $activity, 'callstack' => System::callstack(20)]);
+                                       Logger::warning('Not compacted public collection found', ['activity' => $activity]);
                                        $receiver = ActivityPub::PUBLIC_COLLECTION;
                                }
                                if ($receiver == self::PUBLIC_COLLECTION) {
@@ -1088,7 +1173,7 @@ class Receiver
                if (!empty($actor)) {
                        $profile   = APContact::getByURL($actor);
                        $followers = $profile['followers'] ?? '';
-                       $is_forum  = ($actor['type'] ?? '') == 'Group';
+                       $isGroup  = ($profile['type'] ?? '') == 'Group';
                        if ($push) {
                                Contact::updateByUrlIfNeeded($actor);
                        }
@@ -1096,13 +1181,22 @@ class Receiver
                } else {
                        Logger::info('Empty actor', ['activity' => $activity]);
                        $followers = '';
-                       $is_forum  = false;
+                       $isGroup  = false;
+               }
+
+               $parent_followers = '';
+               $parent = Post::selectFirstPost(['parent-author-link'], ['uri' => $reply]);
+               if (!empty($parent['parent-author-link'])) {
+                       $parent_profile = APContact::getByURL($parent['parent-author-link']);
+                       if (!in_array($parent_profile['followers'] ?? '', ['', $followers])) {
+                               $parent_followers = $parent_profile['followers'];
+                       }
                }
 
                // We have to prevent false follower assumptions upon thread completions
                $follower_target = empty($activity['thread-completion']) ? self::TARGET_FOLLOWER : self::TARGET_UNKNOWN;
 
-               foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
+               foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc', 'as:audience'] as $element) {
                        $receiver_list = JsonLD::fetchElementArray($activity, $element, '@id');
                        if (empty($receiver_list)) {
                                continue;
@@ -1119,8 +1213,13 @@ class Receiver
                                }
 
                                // Fetch the receivers for the public and the followers collection
-                               if ((($receiver == $followers) || (($receiver == self::PUBLIC_COLLECTION) && !$is_forum)) && !empty($actor)) {
-                                       $receivers = self::getReceiverForActor($actor, $tags, $receivers, $follower_target, $profile);
+                               if ((($receiver == $followers) || (($receiver == self::PUBLIC_COLLECTION) && !$isGroup) || ($isGroup && ($element == 'as:audience'))) && !empty($profile)) {
+                                       $receivers = self::getReceiverForActor($tags, $receivers, $follower_target, $profile);
+                                       continue;
+                               }
+
+                               if ($receiver == $parent_followers) {
+                                       $receivers = self::getReceiverForActor([], $receivers, $follower_target, $parent_profile);
                                        continue;
                                }
 
@@ -1138,7 +1237,7 @@ class Receiver
                                        $condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
                                                'network' => $networks, 'archive' => false, 'pending' => false, 'uid' => $contact['uid']];
 
-                                       // Forum posts are only accepted from forum contacts
+                                       // Group posts are only accepted from group contacts
                                        if ($contact['contact-type'] == Contact::TYPE_COMMUNITY) {
                                                $condition['rel'] = [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER];
                                        }
@@ -1163,6 +1262,9 @@ class Receiver
                                                case 'as:bcc':
                                                        $type = self::TARGET_BCC;
                                                        break;
+                                               case 'as:audience':
+                                                       $type = self::TARGET_AUDIENCE;
+                                                       break;
                                        }
 
                                        $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $type];
@@ -1181,14 +1283,18 @@ class Receiver
                self::switchContacts($receivers, $actor);
 
                // "birdsitelive" is a service that mirrors tweets into the fediverse
-               // These posts can be fetched without authentification, but are not marked as public
+               // These posts can be fetched without authentication, but are not marked as public
                // We treat them as unlisted posts to be able to handle them.
+               // We always process deletion activities.
+               $activity_type = JsonLD::fetchElement($activity, '@type');
                if (empty($receivers) && $fetch_unlisted && Contact::isPlatform($actor, 'birdsitelive')) {
                        $receivers[0]  = ['uid' => 0, 'type' => self::TARGET_GLOBAL];
                        $receivers[-1] = ['uid' => -1, 'type' => self::TARGET_GLOBAL];
                        Logger::notice('Post from "birdsitelive" is set to "unlisted"', ['id' => JsonLD::fetchElement($activity, '@id')]);
+               } elseif (empty($receivers) && in_array($activity_type, ['as:Delete', 'as:Undo'])) {
+                       $receivers[0] = ['uid' => 0, 'type' => self::TARGET_GLOBAL];
                } elseif (empty($receivers)) {
-                       Logger::notice('Post has got no receivers', ['fetch_unlisted' => $fetch_unlisted, 'actor' => $actor, 'id' => JsonLD::fetchElement($activity, '@id'), 'type' => JsonLD::fetchElement($activity, '@type')]);
+                       Logger::notice('Post has got no receivers', ['fetch_unlisted' => $fetch_unlisted, 'actor' => $actor, 'id' => JsonLD::fetchElement($activity, '@id'), 'type' => $activity_type]);
                }
 
                return $receivers;
@@ -1197,7 +1303,6 @@ class Receiver
        /**
         * Fetch the receiver list of a given actor
         *
-        * @param string  $actor
         * @param array   $tags
         * @param array   $receivers
         * @param integer $target_type
@@ -1206,41 +1311,20 @@ class Receiver
         * @return array with receivers (user id)
         * @throws \Exception
         */
-       private static function getReceiverForActor(string $actor, array $tags, array $receivers, int $target_type, array $profile): array
+       private static function getReceiverForActor(array $tags, array $receivers, int $target_type, array $profile): array
        {
                $basecondition = ['rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
                        'network' => Protocol::FEDERATED, 'archive' => false, 'pending' => false];
 
-               if (!empty($profile['uri-id'])) {
-                       $condition = DBA::mergeConditions($basecondition, ["`uri-id` = ? AND `uid` != ?", $profile['uri-id'], 0]);
-                       $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
-                       while ($contact = DBA::fetch($contacts)) {
-                               if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
-                                       $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
-                               }
-                       }
-                       DBA::close($contacts);
-               } else {
-                       // This part will only be called while post update 1426 wasn't finished
-                       $condition = DBA::mergeConditions($basecondition, ["`nurl` = ? AND `uid` != ?", Strings::normaliseLink($actor), 0]);
-                       $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
-                       while ($contact = DBA::fetch($contacts)) {
-                               if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
-                                       $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
-                               }
-                       }
-                       DBA::close($contacts);
-
-                       // The queries are split because of performance issues
-                       $condition = DBA::mergeConditions($basecondition, ["`alias` IN (?, ?) AND `uid` != ?", Strings::normaliseLink($actor), $actor, 0]);
-                       $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
-                       while ($contact = DBA::fetch($contacts)) {
-                               if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
-                                       $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
-                               }
+               $condition = DBA::mergeConditions($basecondition, ["`uri-id` = ? AND `uid` != ?", $profile['uri-id'], 0]);
+               $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
+               while ($contact = DBA::fetch($contacts)) {
+                       if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
+                               $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
                        }
-                       DBA::close($contacts);
                }
+               DBA::close($contacts);
+
                return $receivers;
        }
 
@@ -1370,9 +1454,9 @@ class Receiver
        }
 
        /**
-        * Fetches the object data from external ressources if needed
+        * Fetches the object data from external resources if needed
         *
-        * @param string  $object_id    Object ID of the the provided object
+        * @param string  $object_id    Object ID of the provided object
         * @param array   $object       The provided object array
         * @param boolean $trust_source Do we trust the provided object?
         * @param integer $uid          User ID for the signature that we use to fetch data
@@ -1424,21 +1508,9 @@ class Receiver
                        return false;
                }
 
-               // Lemmy is resharing "create" activities instead of content
-               // We fetch the content from the activity.
-               if (in_array($type, ['as:Create'])) {
-                       $object = $object['as:object'];
-                       $type = JsonLD::fetchElement($object, '@type');
-                       if (empty($type)) {
-                               Logger::info('Empty type');
-                               return false;
-                       }
-                       $object_data = self::processObject($object);
-               }
-
                // We currently don't handle 'pt:CacheFile', but with this step we avoid logging
                if (in_array($type, self::CONTENT_TYPES) || ($type == 'pt:CacheFile')) {
-                       $object_data = self::processObject($object);
+                       $object_data = self::processObject($object, '');
 
                        if (!empty($data)) {
                                $object_data['raw-object'] = json_encode($data);
@@ -1488,9 +1560,11 @@ class Receiver
                                continue;
                        }
 
-                       $element = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type') ?? ''),
+                       $element = [
+                               'type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type') ?? ''),
                                'href' => JsonLD::fetchElement($tag, 'as:href', '@id'),
-                               'name' => JsonLD::fetchElement($tag, 'as:name', '@value')];
+                               'name' => JsonLD::fetchElement($tag, 'as:name', '@value')
+                       ];
 
                        if (empty($element['type'])) {
                                continue;
@@ -1521,8 +1595,10 @@ class Receiver
                        }
 
                        $url = JsonLD::fetchElement($emoji['as:icon'], 'as:url', '@id');
-                       $element = ['name' => JsonLD::fetchElement($emoji, 'as:name', '@value'),
-                               'href' => $url];
+                       $element = [
+                               'name' => JsonLD::fetchElement($emoji, 'as:name', '@value'),
+                               'href' => $url
+                       ];
 
                        $emojilist[] = $element;
                }
@@ -1636,7 +1712,7 @@ class Receiver
                                                'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
                                                'mediaType' => JsonLD::fetchElement($attachment, 'as:mediaType', '@value'),
                                                'name' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
-                                               'url' => JsonLD::fetchElement($attachment, 'as:url', '@id'),
+                                               'url' => JsonLD::fetchElement($attachment, 'as:url', '@id') ?? JsonLD::fetchElement($attachment, 'as:href', '@id'),
                                                'height' => JsonLD::fetchElement($attachment, 'as:height', '@value'),
                                                'width' => JsonLD::fetchElement($attachment, 'as:width', '@value'),
                                                'image' => JsonLD::fetchElement($attachment, 'as:image', '@id')
@@ -1842,12 +1918,13 @@ class Receiver
        /**
         * Fetches data from the object part of an activity
         *
-        * @param array $object
+        * @param array  $object
+        * @param string $actor
         *
         * @return array|bool Object data or FALSE if $object does not contain @id element
         * @throws \Exception
         */
-       private static function processObject(array $object)
+       private static function processObject(array $object, string $actor)
        {
                if (!JsonLD::fetchElement($object, '@id')) {
                        return false;
@@ -1855,7 +1932,7 @@ class Receiver
 
                $object_data = self::getObjectDataFromActivity($object);
 
-               $receiverdata = self::getReceivers($object, $object_data['actor'] ?? '', $object_data['tags'], true, false);
+               $receiverdata = self::getReceivers($object, $actor ?: $object_data['actor'] ?? '', $object_data['tags'], true, false);
                $receivers = $reception_types = [];
                foreach ($receiverdata as $key => $data) {
                        $receivers[$key] = $data['uid'];
@@ -1958,6 +2035,7 @@ class Receiver
                $object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag') ?? []);
                $object_data['emojis'] = self::processEmojis(JsonLD::fetchElementArray($object, 'as:tag', null, '@type', 'toot:Emoji') ?? []);
                $object_data['languages'] = self::processLanguages(JsonLD::fetchElementArray($object, 'sc:inLanguage') ?? []);
+               $object_data['transmitted-languages'] = Processor::getPostLanguages($object);
                $object_data['generator'] = JsonLD::fetchElement($object, 'as:generator', 'as:name', '@type', 'as:Application');
                $object_data['generator'] = JsonLD::fetchElement($object_data, 'generator', '@value');
                $object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url', '@id');