]> git.mxchange.org Git - friendica.git/blobdiff - src/Protocol/ActivityPub/Receiver.php
Merge pull request #9146 from tobiasd/2020.09-CHANGELOG
[friendica.git] / src / Protocol / ActivityPub / Receiver.php
index 7a0a9c1f78e838a85ae8ca056db03c26fbe50be9..6910ee11c227d175ad3eae2324a0ac097805f22e 100644 (file)
@@ -33,7 +33,6 @@ use Friendica\Model\Item;
 use Friendica\Model\User;
 use Friendica\Protocol\Activity;
 use Friendica\Protocol\ActivityPub;
-use Friendica\Util\DateTimeFormat;
 use Friendica\Util\HTTPSignature;
 use Friendica\Util\JsonLD;
 use Friendica\Util\LDSignature;
@@ -59,6 +58,15 @@ class Receiver
        const CONTENT_TYPES = ['as:Note', 'as:Article', 'as:Video', 'as:Image', 'as:Event', 'as:Audio'];
        const ACTIVITY_TYPES = ['as:Like', 'as:Dislike', 'as:Accept', 'as:Reject', 'as:TentativeAccept'];
 
+       const TARGET_UNKNOWN = 0;
+       const TARGET_TO = 1;
+       const TARGET_CC = 2;
+       const TARGET_BTO = 3;
+       const TARGET_BCC = 4;
+       const TARGET_FOLLOWER = 5;
+       const TARGET_ANSWER = 6;
+       const TARGET_GLOBAL = 7;
+
        /**
         * Checks if the web request is done for the AP protocol
         *
@@ -80,16 +88,7 @@ class Receiver
         */
        public static function processInbox($body, $header, $uid)
        {
-               $http_signer = HTTPSignature::getSigner($body, $header);
-               if (empty($http_signer)) {
-                       Logger::warning('Invalid HTTP signature, message will be discarded.');
-                       return;
-               } else {
-                       Logger::info('Valid HTTP signature', ['signer' => $http_signer]);
-               }
-
                $activity = json_decode($body, true);
-
                if (empty($activity)) {
                        Logger::warning('Invalid body.');
                        return;
@@ -99,12 +98,30 @@ class Receiver
 
                $actor = JsonLD::fetchElement($ldactivity, 'as:actor', '@id');
 
+               $apcontact = APContact::getByURL($actor);
+               if (!empty($apcontact) && ($apcontact['type'] == 'Application') && ($apcontact['nick'] == 'relay')) {
+                       self::processRelayPost($ldactivity);
+                       return;
+               }
+
+               $http_signer = HTTPSignature::getSigner($body, $header);
+               if (empty($http_signer)) {
+                       Logger::warning('Invalid HTTP signature, message will be discarded.');
+                       return;
+               } else {
+                       Logger::info('Valid HTTP signature', ['signer' => $http_signer]);
+               }
+
+               $signer = [$http_signer];
+
                Logger::info('Message for user ' . $uid . ' is from actor ' . $actor);
 
                if (LDSignature::isSigned($activity)) {
                        $ld_signer = LDSignature::getSigner($activity);
                        if (empty($ld_signer)) {
                                Logger::log('Invalid JSON-LD signature from ' . $actor, Logger::DEBUG);
+                       } elseif ($ld_signer != $http_signer) {
+                               $signer[] = $ld_signer;
                        }
                        if (!empty($ld_signer && ($actor == $http_signer))) {
                                Logger::log('The HTTP and the JSON-LD signature belong to ' . $ld_signer, Logger::DEBUG);
@@ -127,7 +144,50 @@ class Receiver
                        $trust_source = false;
                }
 
-               self::processActivity($ldactivity, $body, $uid, $trust_source, true);
+               self::processActivity($ldactivity, $body, $uid, $trust_source, true, $signer);
+       }
+
+       /**
+        * Process incoming posts from relays
+        *
+        * @param array $activity
+        * @return void
+        */
+       private static function processRelayPost(array $activity)
+       {
+               $type = JsonLD::fetchElement($activity, '@type');
+               if (!$type) {
+                       Logger::info('Empty type', ['activity' => $activity]);
+                       return;
+               }
+
+               if ($type != 'as:Announce') {
+                       Logger::info('Not an announcement', ['activity' => $activity]);
+                       return;
+               }
+
+               $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
+               if (empty($object_id)) {
+                       Logger::info('No object id found', ['activity' => $activity]);
+                       return;
+               }
+
+               Logger::info('Got relayed message id', ['id' => $object_id]);
+
+               $item_id = Item::searchByLink($object_id);
+               if ($item_id) {
+                       Logger::info('Relayed message already exists', ['id' => $object_id, 'item' => $item_id]);
+                       return;
+               }
+
+               Processor::fetchMissingActivity($object_id);
+
+               $item_id = Item::searchByLink($object_id);
+               if ($item_id) {
+                       Logger::info('Relayed message had been fetched and stored', ['id' => $object_id, 'item' => $item_id]);
+               } else {
+                       Logger::notice('Relayed message had not been stored', ['id' => $object_id]);
+               }
        }
 
        /**
@@ -184,31 +244,55 @@ class Receiver
         * @throws \Friendica\Network\HTTPException\InternalServerErrorException
         * @throws \ImagickException
         */
-       private static function prepareObjectData($activity, $uid, $push, &$trust_source)
+       public static function prepareObjectData($activity, $uid, $push, &$trust_source)
        {
+               $id = JsonLD::fetchElement($activity, '@id');
+               if (!empty($id) && !$trust_source) {
+                       $fetched_activity = ActivityPub::fetchContent($id, $uid ?? 0);
+                       if (!empty($fetched_activity)) {
+                               $object = JsonLD::compact($fetched_activity);
+                               $fetched_id = JsonLD::fetchElement($object, '@id');
+                               if ($fetched_id == $id) {
+                                       Logger::info('Activity had been fetched successfully', ['id' => $id]);
+                                       $trust_source = true;
+                                       $activity = $object;
+                               } else {
+                                       Logger::info('Activity id is not equal', ['id' => $id, 'fetched' => $fetched_id]);
+                               }
+                       } else {
+                               Logger::info('Activity could not been fetched', ['id' => $id]);
+                       }
+               }
+
                $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
                if (empty($actor)) {
-                       Logger::log('Empty actor', Logger::DEBUG);
+                       Logger::info('Empty actor', ['activity' => $activity]);
                        return [];
                }
 
                $type = JsonLD::fetchElement($activity, '@type');
 
                // Fetch all receivers from to, cc, bto and bcc
-               $receivers = self::getReceivers($activity, $actor);
+               $receiverdata = self::getReceivers($activity, $actor);
+               $receivers = $reception_types = [];
+               foreach ($receiverdata as $key => $data) {
+                       $receivers[$key] = $data['uid'];
+                       $reception_types[$data['uid']] = $data['type'] ?? 0;
+               }
 
                // When it is a delivery to a personal inbox we add that user to the receivers
                if (!empty($uid)) {
                        $additional = ['uid:' . $uid => $uid];
                        $receivers = array_merge($receivers, $additional);
+                       if (empty($reception_types[$uid]) || in_array($reception_types[$uid], [self::TARGET_UNKNOWN, self::TARGET_FOLLOWER, self::TARGET_ANSWER, self::TARGET_GLOBAL])) {
+                               $reception_types[$uid] = self::TARGET_BCC;
+                       }
                } else {
                        // We possibly need some user to fetch private content,
                        // so we fetch the first out ot the list.
                        $uid = self::getFirstUserFromReceivers($receivers);
                }
 
-               Logger::log('Receivers: ' . $uid . ' - ' . json_encode($receivers), Logger::DEBUG);
-
                $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
                if (empty($object_id)) {
                        Logger::log('No object found', Logger::DEBUG);
@@ -224,10 +308,8 @@ class Receiver
 
                // Fetch the content only on activities where this matters
                if (in_array($type, ['as:Create', 'as:Update', 'as:Announce'])) {
-                       if ($type == 'as:Announce') {
-                               $trust_source = false;
-                       }
-                       $object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source, $uid);
+                       // Always fetch on "Announce"
+                       $object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source && ($type != 'as:Announce'), $uid);
                        if (empty($object_data)) {
                                Logger::log("Object data couldn't be processed", Logger::DEBUG);
                                return [];
@@ -247,9 +329,6 @@ class Receiver
                        } else {
                                $object_data['directmessage'] = JsonLD::fetchElement($activity, 'litepub:directMessage');
                        }
-
-                       // We had been able to retrieve the object data - so we can trust the source
-                       $trust_source = true;
                } elseif (in_array($type, array_merge(self::ACTIVITY_TYPES, ['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 ech individual array element.
@@ -289,6 +368,19 @@ class Receiver
                $object_data['actor'] = $actor;
                $object_data['item_receiver'] = $receivers;
                $object_data['receiver'] = array_merge($object_data['receiver'] ?? [], $receivers);
+               $object_data['reception_type'] = array_merge($object_data['reception_type'] ?? [], $reception_types);
+
+               $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;
+                       }
+               }
 
                Logger::log('Processing ' . $object_data['type'] . ' ' . $object_data['object_type'] . ' ' . $object_data['id'], Logger::DEBUG);
 
@@ -321,44 +413,49 @@ class Receiver
         * @param boolean $push         Message had been pushed to our system
         * @throws \Exception
         */
-       public static function processActivity($activity, $body = '', $uid = null, $trust_source = false, $push = false)
+       public static function processActivity($activity, string $body = '', int $uid = null, bool $trust_source = false, bool $push = false, array $signer = [])
        {
                $type = JsonLD::fetchElement($activity, '@type');
                if (!$type) {
-                       Logger::log('Empty type', Logger::DEBUG);
+                       Logger::info('Empty type', ['activity' => $activity]);
                        return;
                }
 
                if (!JsonLD::fetchElement($activity, 'as:object', '@id')) {
-                       Logger::log('Empty object', Logger::DEBUG);
+                       Logger::info('Empty object', ['activity' => $activity]);
                        return;
                }
 
-               if (!JsonLD::fetchElement($activity, 'as:actor', '@id')) {
-                       Logger::log('Empty actor', Logger::DEBUG);
+               $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
+               if (empty($actor)) {
+                       Logger::info('Empty actor', ['activity' => $activity]);
                        return;
-
                }
 
-               // Don't trust the source if "actor" differs from "attributedTo". The content could be forged.
-               if ($trust_source && ($type == 'as:Create') && is_array($activity['as:object'])) {
-                       $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
+               if (is_array($activity['as:object'])) {
                        $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
-                       $trust_source = ($actor == $attributed_to);
-                       if (!$trust_source) {
-                               Logger::log('Not trusting actor: ' . $actor . '. It differs from attributedTo: ' . $attributed_to, Logger::DEBUG);
+               } else {
+                       $attributed_to = '';
+               }
+
+               // Test the provided signatures against the actor and "attributedTo"
+               if ($trust_source) {
+                       if (!empty($attributed_to) && !empty($actor)) {
+                               $trust_source = (in_array($actor, $signer) && in_array($attributed_to, $signer));
+                       } else {
+                               $trust_source = in_array($actor, $signer);
                        }
                }
 
                // $trust_source is called by reference and is set to true if the content was retrieved successfully
                $object_data = self::prepareObjectData($activity, $uid, $push, $trust_source);
                if (empty($object_data)) {
-                       Logger::log('No object data found', Logger::DEBUG);
+                       Logger::info('No object data found', ['activity' => $activity]);
                        return;
                }
 
                if (!$trust_source) {
-                       Logger::log('No trust for activity type "' . $type . '", so we quit now.', Logger::DEBUG);
+                       Logger::info('Activity trust could not be achieved.',  ['id' => $object_data['object_id'], 'type' => $type, 'signer' => $signer, 'actor' => $actor, 'attributedTo' => $attributed_to]);
                        return;
                }
 
@@ -374,7 +471,8 @@ class Receiver
                switch ($type) {
                        case 'as:Create':
                                if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
-                                       ActivityPub\Processor::createItem($object_data);
+                                       $item = ActivityPub\Processor::createItem($object_data);
+                                       ActivityPub\Processor::postItem($object_data, $item);
                                }
                                break;
 
@@ -386,28 +484,28 @@ class Receiver
 
                        case 'as:Announce':
                                if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
-                                       $profile = APContact::getByURL($object_data['actor']);
-                                       // Reshared posts from persons appear as summary at the bottom
-                                       // If this isn't set, then a single reshare appears on top. This is used for groups.
-                                       $object_data['thread-completion'] = ($profile['type'] != 'Group');
-
-                                       ActivityPub\Processor::createItem($object_data);
-
-                                       // Add the bottom reshare information only for persons
-                                       if ($profile['type'] != 'Group') {
-                                               $announce_object_data = self::processObject($activity);
-                                               $announce_object_data['name'] = $type;
-                                               $announce_object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
-                                               $announce_object_data['object_id'] = $object_data['object_id'];
-                                               $announce_object_data['object_type'] = $object_data['object_type'];
-                                               $announce_object_data['push'] = $push;
-
-                                               if (!empty($body)) {
-                                                       $announce_object_data['raw'] = $body;
-                                               }
+                                       $object_data['thread-completion'] = true;
+
+                                       $item = ActivityPub\Processor::createItem($object_data);
+                                       if (empty($item)) {
+                                               return;
+                                       }
+
+                                       $item['post-type'] = Item::PT_ANNOUNCEMENT;
+                                       ActivityPub\Processor::postItem($object_data, $item);
 
-                                               ActivityPub\Processor::createActivity($announce_object_data, Activity::ANNOUNCE);
+                                       $announce_object_data = self::processObject($activity);
+                                       $announce_object_data['name'] = $type;
+                                       $announce_object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
+                                       $announce_object_data['object_id'] = $object_data['object_id'];
+                                       $announce_object_data['object_type'] = $object_data['object_type'];
+                                       $announce_object_data['push'] = $push;
+
+                                       if (!empty($body)) {
+                                               $announce_object_data['raw'] = $body;
                                        }
+
+                                       ActivityPub\Processor::createActivity($announce_object_data, Activity::ANNOUNCE);
                                }
                                break;
 
@@ -502,18 +600,30 @@ class Receiver
         */
        private static function getReceivers($activity, $actor, $tags = [], $fetch_unlisted = false)
        {
-               $receivers = [];
+               $reply = $receivers = [];
 
                // When it is an answer, we inherite the receivers from the parent
                $replyto = JsonLD::fetchElement($activity, 'as:inReplyTo', '@id');
                if (!empty($replyto)) {
+                       $reply = [$replyto];
+
                        // Fix possibly wrong item URI (could be an answer to a plink uri)
                        $fixedReplyTo = Item::getURIByLink($replyto);
-                       $replyto = $fixedReplyTo ?: $replyto;
+                       if (!empty($fixedReplyTo)) {
+                               $reply[] = $fixedReplyTo;
+                       }
+               }
 
-                       $parents = Item::select(['uid'], ['uri' => $replyto]);
+               // Fetch all posts that refer to the object id
+               $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
+               if (!empty($object_id)) {
+                       $reply[] = $object_id;
+               }
+
+               if (!empty($reply)) {
+                       $parents = Item::select(['uid'], ['uri' => $reply]);
                        while ($parent = Item::fetch($parents)) {
-                               $receivers['uid:' . $parent['uid']] = $parent['uid'];
+                               $receivers['uid:' . $parent['uid']] = ['uid' => $parent['uid'], 'type' => self::TARGET_ANSWER];
                        }
                }
 
@@ -523,7 +633,7 @@ class Receiver
 
                        Logger::log('Actor: ' . $actor . ' - Followers: ' . $followers, Logger::DEBUG);
                } else {
-                       Logger::log('Empty actor', Logger::DEBUG);
+                       Logger::info('Empty actor', ['activity' => $activity]);
                        $followers = '';
                }
 
@@ -535,29 +645,17 @@ class Receiver
 
                        foreach ($receiver_list as $receiver) {
                                if ($receiver == self::PUBLIC_COLLECTION) {
-                                       $receivers['uid:0'] = 0;
+                                       $receivers['uid:0'] = ['uid' => 0, 'type' => self::TARGET_GLOBAL];
                                }
 
                                // Add receiver "-1" for unlisted posts 
                                if ($fetch_unlisted && ($receiver == self::PUBLIC_COLLECTION) && ($element == 'as:cc')) {
-                                       $receivers['uid:-1'] = -1;
-                               }
-
-                               if (($receiver == self::PUBLIC_COLLECTION) && !empty($actor)) {
-                                       // This will most likely catch all OStatus connections to Mastodon
-                                       $condition = ['alias' => [$actor, Strings::normaliseLink($actor)], 'rel' => [Contact::SHARING, Contact::FRIEND]
-                                               , 'archive' => false, 'pending' => false];
-                                       $contacts = DBA::select('contact', ['uid'], $condition);
-                                       while ($contact = DBA::fetch($contacts)) {
-                                               if ($contact['uid'] != 0) {
-                                                       $receivers['uid:' . $contact['uid']] = $contact['uid'];
-                                               }
-                                       }
-                                       DBA::close($contacts);
+                                       $receivers['uid:-1'] = ['uid' => -1, 'type' => self::TARGET_GLOBAL];
                                }
 
+                               // Fetch the receivers for the public and the followers collection
                                if (in_array($receiver, [$followers, self::PUBLIC_COLLECTION]) && !empty($actor)) {
-                                       $receivers = array_merge($receivers, self::getReceiverForActor($actor, $tags));
+                                       $receivers = self::getReceiverForActor($actor, $tags, $receivers);
                                        continue;
                                }
 
@@ -585,7 +683,25 @@ class Receiver
                                        }
                                }
 
-                               $receivers['uid:' . $contact['uid']] = $contact['uid'];
+                               $type = $receivers['uid:' . $contact['uid']]['type'] ?? self::TARGET_UNKNOWN;
+                               if (in_array($type, [self::TARGET_UNKNOWN, self::TARGET_FOLLOWER, self::TARGET_ANSWER, self::TARGET_GLOBAL])) {
+                                       switch ($element) {
+                                               case 'as:to':
+                                                       $type = self::TARGET_TO;
+                                                       break;
+                                               case 'as:cc':
+                                                       $type = self::TARGET_CC;
+                                                       break;
+                                               case 'as:bto':
+                                                       $type = self::TARGET_BTO;
+                                                       break;
+                                               case 'as:bcc':
+                                                       $type = self::TARGET_BCC;
+                                                       break;
+                                       }
+
+                                       $receivers['uid:' . $contact['uid']] = ['uid' => $contact['uid'], 'type' => $type];
+                               }
                        }
                }
 
@@ -603,16 +719,26 @@ class Receiver
         * @return array with receivers (user id)
         * @throws \Exception
         */
-       public static function getReceiverForActor($actor, $tags)
+       private static function getReceiverForActor($actor, $tags, $receivers)
        {
-               $receivers = [];
-               $networks = Protocol::FEDERATED;
-               $condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
-                       'network' => $networks, 'archive' => false, 'pending' => false];
+               $basecondition = ['rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
+                       'network' => Protocol::FEDERATED, 'archive' => false, 'pending' => false];
+
+               $condition = DBA::mergeConditions($basecondition, ['nurl' => Strings::normaliseLink($actor)]);
                $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
                while ($contact = DBA::fetch($contacts)) {
-                       if (self::isValidReceiverForActor($contact, $actor, $tags)) {
-                               $receivers['uid:' . $contact['uid']] = $contact['uid'];
+                       if (empty($receivers['uid:' . $contact['uid']]) && self::isValidReceiverForActor($contact, $actor, $tags)) {
+                               $receivers['uid:' . $contact['uid']] = ['uid' => $contact['uid'], 'type' => self::TARGET_FOLLOWER];
+                       }
+               }
+               DBA::close($contacts);
+
+               // The queries are split because of performance issues
+               $condition = DBA::mergeConditions($basecondition, ["`alias` IN (?, ?)", Strings::normaliseLink($actor), $actor]);
+               $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
+               while ($contact = DBA::fetch($contacts)) {
+                       if (empty($receivers['uid:' . $contact['uid']]) && self::isValidReceiverForActor($contact, $actor, $tags)) {
+                               $receivers['uid:' . $contact['uid']] = ['uid' => $contact['uid'], 'type' => self::TARGET_FOLLOWER];
                        }
                }
                DBA::close($contacts);
@@ -677,7 +803,7 @@ class Receiver
                        return;
                }
 
-               if (Contact::updateFromProbe($cid, '', true)) {
+               if (Contact::updateFromProbe($cid)) {
                        Logger::info('Update was successful', ['id' => $cid, 'uid' => $uid, 'url' => $url]);
                }
 
@@ -703,14 +829,14 @@ class Receiver
                }
 
                foreach ($receivers as $receiver) {
-                       $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'nurl' => Strings::normaliseLink($actor)]);
+                       $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver['uid'], 'network' => Protocol::OSTATUS, 'nurl' => Strings::normaliseLink($actor)]);
                        if (DBA::isResult($contact)) {
-                               self::switchContact($contact['id'], $receiver, $actor);
+                               self::switchContact($contact['id'], $receiver['uid'], $actor);
                        }
 
-                       $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver, 'network' => Protocol::OSTATUS, 'alias' => [Strings::normaliseLink($actor), $actor]]);
+                       $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver['uid'], 'network' => Protocol::OSTATUS, 'alias' => [Strings::normaliseLink($actor), $actor]]);
                        if (DBA::isResult($contact)) {
-                               self::switchContact($contact['id'], $receiver, $actor);
+                               self::switchContact($contact['id'], $receiver['uid'], $actor);
                        }
                }
        }
@@ -782,18 +908,29 @@ class Receiver
                                $data = ActivityPub\Transmitter::createNote($item);
                                $object = JsonLD::compact($data);
                        }
+
+                       $id = JsonLD::fetchElement($object, '@id');
+                       if (empty($id)) {
+                               Logger::info('Empty id');
+                               return false;
+                       }
+       
+                       if ($id != $object_id) {
+                               Logger::info('Fetched id differs from provided id', ['provided' => $object_id, 'fetched' => $id]);
+                               return false;
+                       }
                } else {
                        Logger::log('Using original object for url ' . $object_id, Logger::DEBUG);
                }
 
                $type = JsonLD::fetchElement($object, '@type');
-
                if (empty($type)) {
-                       Logger::log('Empty type', Logger::DEBUG);
+                       Logger::info('Empty type');
                        return false;
                }
 
-               if (in_array($type, self::CONTENT_TYPES)) {
+               // We currently don't handle 'pt:CacheFile', but with this step we avoid logging
+               if (in_array($type, self::CONTENT_TYPES) || ($type == 'pt:CacheFile')) {
                        $object_data = self::processObject($object);
 
                        if (!empty($data)) {
@@ -877,7 +1014,7 @@ class Receiver
         *
         * @param array $attachments Attachments in JSON-LD format
         *
-        * @return array with attachmants in a simplified format
+        * @return array Attachments in a simplified format
         */
        private static function processAttachments(array $attachments)
        {
@@ -925,6 +1062,62 @@ class Receiver
                                                'url' => JsonLD::fetchElement($attachment, 'as:href', '@id')
                                        ];
                                        break;
+                               case 'as:Image':
+                                       $mediaType = JsonLD::fetchElement($attachment, 'as:mediaType', '@value');
+                                       $imageFullUrl = JsonLD::fetchElement($attachment, 'as:url', '@id');
+                                       $imagePreviewUrl = null;
+                                       // Multiple URLs?
+                                       if (!$imageFullUrl && ($urls = JsonLD::fetchElementArray($attachment, 'as:url'))) {
+                                               $imageVariants = [];
+                                               $previewVariants = [];
+                                               foreach ($urls as $url) {
+                                                       // Scalar URL, no discrimination possible
+                                                       if (is_string($url)) {
+                                                               $imageFullUrl = $url;
+                                                               continue;
+                                                       }
+
+                                                       // Not sure what to do with a different Link media type than the base Image, we skip
+                                                       if ($mediaType != JsonLD::fetchElement($url, 'as:mediaType', '@value')) {
+                                                               continue;
+                                                       }
+
+                                                       $href = JsonLD::fetchElement($url, 'as:href', '@id');
+
+                                                       // Default URL choice if no discriminating width is provided
+                                                       $imageFullUrl = $href ?? $imageFullUrl;
+
+                                                       $width = intval(JsonLD::fetchElement($url, 'as:width', '@value') ?? 1);
+
+                                                       if ($href && $width) {
+                                                               $imageVariants[$width] = $href;
+                                                               // 632 is the ideal width for full screen frio posts, we compute the absolute distance to it
+                                                               $previewVariants[abs(632 - $width)] = $href;
+                                                       }
+                                               }
+
+                                               if ($imageVariants) {
+                                                       // Taking the maximum size image
+                                                       ksort($imageVariants);
+                                                       $imageFullUrl = array_pop($imageVariants);
+
+                                                       // Taking the minimum number distance to the target distance
+                                                       ksort($previewVariants);
+                                                       $imagePreviewUrl = array_shift($previewVariants);
+                                               }
+
+                                               unset($imageVariants);
+                                               unset($previewVariants);
+                                       }
+
+                                       $attachlist[] = [
+                                               'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
+                                               'mediaType' => $mediaType,
+                                               'name'  => JsonLD::fetchElement($attachment, 'as:name', '@value'),
+                                               'url'   => $imageFullUrl,
+                                               'image' => $imagePreviewUrl !== $imageFullUrl ? $imagePreviewUrl : null,
+                                       ];
+                                       break;
                                default:
                                        $attachlist[] = [
                                                'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
@@ -1137,7 +1330,16 @@ class Receiver
                        $object_data = self::processAttachmentUrls($object, $object_data);
                }
 
-               $object_data['receiver'] = self::getReceivers($object, $object_data['actor'], $object_data['tags'], true);
+               $receiverdata = self::getReceivers($object, $object_data['actor'], $object_data['tags'], true);
+               $receivers = $reception_types = [];
+               foreach ($receiverdata as $key => $data) {
+                       $receivers[$key] = $data['uid'];
+                       $reception_types[$data['uid']] = $data['type'] ?? 0;
+               }
+
+               $object_data['receiver'] = $receivers;
+               $object_data['reception_type'] = $reception_types;
+
                $object_data['unlisted'] = in_array(-1, $object_data['receiver']);
                unset($object_data['receiver']['uid:-1']);