3 * @copyright Copyright (C) 2010-2022, the Friendica project
5 * @license GNU AGPL version 3 or any later version
7 * This program is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU Affero General Public License as
9 * published by the Free Software Foundation, either version 3 of the
10 * License, or (at your option) any later version.
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Affero General Public License for more details.
17 * You should have received a copy of the GNU Affero General Public License
18 * along with this program. If not, see <https://www.gnu.org/licenses/>.
22 namespace Friendica\Protocol\ActivityPub;
24 use Friendica\Content\Text\BBCode;
25 use Friendica\Database\DBA;
26 use Friendica\Content\Text\HTML;
27 use Friendica\Content\Text\Markdown;
28 use Friendica\Core\Logger;
29 use Friendica\Core\Protocol;
30 use Friendica\Core\System;
32 use Friendica\Model\Contact;
33 use Friendica\Model\APContact;
34 use Friendica\Model\Item;
35 use Friendica\Model\Post;
36 use Friendica\Model\User;
37 use Friendica\Protocol\Activity;
38 use Friendica\Protocol\ActivityPub;
39 use Friendica\Util\HTTPSignature;
40 use Friendica\Util\JsonLD;
41 use Friendica\Util\LDSignature;
42 use Friendica\Util\Network;
43 use Friendica\Util\Strings;
46 * ActivityPub Receiver Protocol class
51 * Check what this is meant to do:
60 const PUBLIC_COLLECTION = 'as:Public';
61 const ACCOUNT_TYPES = ['as:Person', 'as:Organization', 'as:Service', 'as:Group', 'as:Application'];
62 const CONTENT_TYPES = ['as:Note', 'as:Article', 'as:Video', 'as:Image', 'as:Event', 'as:Audio', 'as:Page', 'as:Question'];
63 const ACTIVITY_TYPES = ['as:Like', 'as:Dislike', 'as:Accept', 'as:Reject', 'as:TentativeAccept'];
65 const TARGET_UNKNOWN = 0;
70 const TARGET_FOLLOWER = 5;
71 const TARGET_ANSWER = 6;
72 const TARGET_GLOBAL = 7;
74 const COMPLETION_NONE = 0;
75 const COMPLETION_ANNOUCE = 1;
76 const COMPLETION_RELAY = 2;
77 const COMPLETION_MANUAL = 3;
78 const COMPLETION_AUTO = 4;
81 * Checks incoming message from the inbox
85 * @param integer $uid User ID
87 * @todo Find type for $body/$header
89 public static function processInbox($body, $header, int $uid)
91 $activity = json_decode($body, true);
92 if (empty($activity)) {
93 Logger::warning('Invalid body.');
97 $ldactivity = JsonLD::compact($activity);
99 $actor = JsonLD::fetchElement($ldactivity, 'as:actor', '@id');
101 $apcontact = APContact::getByURL($actor);
102 if (empty($apcontact)) {
103 Logger::notice('Unable to retrieve AP contact for actor - message is discarded', ['actor' => $actor]);
105 } elseif ($apcontact['type'] == 'Application' && $apcontact['nick'] == 'relay') {
106 self::processRelayPost($ldactivity, $actor);
109 APContact::unmarkForArchival($apcontact);
112 $http_signer = HTTPSignature::getSigner($body, $header);
113 if ($http_signer === false) {
114 Logger::warning('Invalid HTTP signature, message will be discarded.');
116 } elseif (empty($http_signer)) {
117 Logger::info('Signer is a tombstone. The message will be discarded, the signer account is deleted.');
120 Logger::info('Valid HTTP signature', ['signer' => $http_signer]);
123 $signer = [$http_signer];
125 Logger::info('Message for user ' . $uid . ' is from actor ' . $actor);
127 if (LDSignature::isSigned($activity)) {
128 $ld_signer = LDSignature::getSigner($activity);
129 if (empty($ld_signer)) {
130 Logger::info('Invalid JSON-LD signature from ' . $actor);
131 } elseif ($ld_signer != $http_signer) {
132 $signer[] = $ld_signer;
134 if (!empty($ld_signer && ($actor == $http_signer))) {
135 Logger::info('The HTTP and the JSON-LD signature belong to ' . $ld_signer);
136 $trust_source = true;
137 } elseif (!empty($ld_signer)) {
138 Logger::info('JSON-LD signature is signed by ' . $ld_signer);
139 $trust_source = true;
140 } elseif ($actor == $http_signer) {
141 Logger::info('Bad JSON-LD signature, but HTTP signer fits the actor.');
142 $trust_source = true;
144 Logger::info('Invalid JSON-LD signature and the HTTP signer is different.');
145 $trust_source = false;
147 } elseif ($actor == $http_signer) {
148 Logger::info('Trusting post without JSON-LD signature, The actor fits the HTTP signer.');
149 $trust_source = true;
151 Logger::info('No JSON-LD signature, different actor.');
152 $trust_source = false;
155 self::processActivity($ldactivity, $body, $uid, $trust_source, true, $signer);
159 * Process incoming posts from relays
161 * @param array $activity
162 * @param string $actor
165 private static function processRelayPost(array $activity, string $actor)
167 $type = JsonLD::fetchElement($activity, '@type');
169 Logger::info('Empty type', ['activity' => $activity]);
173 if ($type != 'as:Announce') {
174 Logger::info('Not an announcement', ['activity' => $activity]);
178 $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
179 if (empty($object_id)) {
180 Logger::info('No object id found', ['activity' => $activity]);
184 $contact = Contact::getByURL($actor);
185 if (empty($contact)) {
186 Logger::info('Relay contact not found', ['actor' => $actor]);
190 if (!in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND])) {
191 Logger::notice('Relay is no sharer', ['actor' => $actor]);
195 Logger::info('Got relayed message id', ['id' => $object_id]);
197 $item_id = Item::searchByLink($object_id);
199 Logger::info('Relayed message already exists', ['id' => $object_id, 'item' => $item_id]);
203 $id = Processor::fetchMissingActivity($object_id, [], $actor, self::COMPLETION_RELAY);
205 Logger::notice('Relayed message had not been fetched', ['id' => $object_id]);
209 $item_id = Item::searchByLink($object_id);
211 Logger::info('Relayed message had been fetched and stored', ['id' => $object_id, 'item' => $item_id]);
213 Logger::notice('Relayed message had not been stored', ['id' => $object_id]);
218 * Fetches the object type for a given object id
220 * @param array $activity
221 * @param string $object_id Object ID of the the provided object
222 * @param integer $uid User ID
224 * @return string with object type or NULL
225 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
226 * @throws \ImagickException
228 private static function fetchObjectType(array $activity, string $object_id, int $uid = 0)
230 if (!empty($activity['as:object'])) {
231 $object_type = JsonLD::fetchElement($activity['as:object'], '@type');
232 if (!empty($object_type)) {
237 if (Post::exists(['uri' => $object_id, 'gravity' => [GRAVITY_PARENT, GRAVITY_COMMENT]])) {
238 // We just assume "note" since it doesn't make a difference for the further processing
242 $profile = APContact::getByURL($object_id);
243 if (!empty($profile['type'])) {
244 APContact::unmarkForArchival($profile);
245 return 'as:' . $profile['type'];
248 $data = ActivityPub::fetchContent($object_id, $uid);
250 $object = JsonLD::compact($data);
251 $type = JsonLD::fetchElement($object, '@type');
261 * Prepare the object array
263 * @param array $activity Array with activity data
264 * @param integer $uid User ID
265 * @param boolean $push Message had been pushed to our system
266 * @param boolean $trust_source Do we trust the source?
268 * @return array with object data
269 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
270 * @throws \ImagickException
272 public static function prepareObjectData(array $activity, int $uid, bool $push, bool &$trust_source): array
274 $id = JsonLD::fetchElement($activity, '@id');
275 if (!empty($id) && !$trust_source) {
276 $fetch_uid = $uid ?: self::getBestUserForActivity($activity);
278 $fetched_activity = ActivityPub::fetchContent($id, $fetch_uid);
279 if (!empty($fetched_activity)) {
280 $object = JsonLD::compact($fetched_activity);
281 $fetched_id = JsonLD::fetchElement($object, '@id');
282 if ($fetched_id == $id) {
283 Logger::info('Activity had been fetched successfully', ['id' => $id]);
284 $trust_source = true;
287 Logger::info('Activity id is not equal', ['id' => $id, 'fetched' => $fetched_id]);
290 Logger::info('Activity could not been fetched', ['id' => $id]);
294 $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
296 Logger::info('Empty actor', ['activity' => $activity]);
300 $type = JsonLD::fetchElement($activity, '@type');
302 // Fetch all receivers from to, cc, bto and bcc
303 $receiverdata = self::getReceivers($activity, $actor);
304 $receivers = $reception_types = [];
305 foreach ($receiverdata as $key => $data) {
306 $receivers[$key] = $data['uid'];
307 $reception_types[$data['uid']] = $data['type'] ?? self::TARGET_UNKNOWN;
310 $urls = self::getReceiverURL($activity);
312 // When it is a delivery to a personal inbox we add that user to the receivers
314 $additional = [$uid => $uid];
315 $receivers = array_replace($receivers, $additional);
316 if (empty($activity['thread-completion']) && (empty($reception_types[$uid]) || in_array($reception_types[$uid], [self::TARGET_UNKNOWN, self::TARGET_FOLLOWER, self::TARGET_ANSWER, self::TARGET_GLOBAL]))) {
317 $reception_types[$uid] = self::TARGET_BCC;
318 $owner = User::getOwnerDataById($uid);
319 if (!empty($owner['url'])) {
320 $urls['as:bcc'][] = $owner['url'];
325 // We possibly need some user to fetch private content,
326 // so we fetch one out of the receivers if no uid is provided.
327 $fetch_uid = $uid ?: self::getBestUserForActivity($activity);
329 $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
330 if (empty($object_id)) {
331 Logger::info('No object found');
335 if (!is_string($object_id)) {
336 Logger::info('Invalid object id', ['object' => $object_id]);
340 $object_type = self::fetchObjectType($activity, $object_id, $fetch_uid);
342 // Fetch the activity on Lemmy "Announce" messages (announces of activities)
343 if (($type == 'as:Announce') && in_array($object_type, array_merge(self::ACTIVITY_TYPES, ['as:Delete', 'as:Undo', 'as:Update']))) {
344 $data = ActivityPub::fetchContent($object_id, $fetch_uid);
346 $type = $object_type;
347 $activity = JsonLD::compact($data);
349 // Some variables need to be refetched since the activity changed
350 $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
351 $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
352 $object_type = self::fetchObjectType($activity, $object_id, $fetch_uid);
356 // Any activities on account types must not be altered
357 if (in_array($object_type, self::ACCOUNT_TYPES)) {
359 $object_data['id'] = JsonLD::fetchElement($activity, '@id');
360 $object_data['object_id'] = JsonLD::fetchElement($activity, 'as:object', '@id');
361 $object_data['object_actor'] = JsonLD::fetchElement($activity['as:object'], 'as:actor', '@id');
362 $object_data['object_object'] = JsonLD::fetchElement($activity['as:object'], 'as:object');
363 $object_data['object_type'] = JsonLD::fetchElement($activity['as:object'], '@type');
364 $object_data['push'] = $push;
365 } elseif (in_array($type, ['as:Create', 'as:Update', 'as:Announce', 'as:Invite']) || strpos($type, '#emojiReaction')) {
366 // Fetch the content only on activities where this matters
367 // We can receive "#emojiReaction" when fetching content from Hubzilla systems
368 // Always fetch on "Announce"
369 $object_data = self::fetchObject($object_id, $activity['as:object'], $trust_source && ($type != 'as:Announce'), $fetch_uid);
370 if (empty($object_data)) {
371 Logger::info("Object data couldn't be processed");
375 $object_data['object_id'] = $object_id;
377 if ($type == 'as:Announce') {
378 $object_data['push'] = false;
380 $object_data['push'] = $push;
383 // Test if it is an answer to a mail
384 if (DBA::exists('mail', ['uri' => $object_data['reply-to-id']])) {
385 $object_data['directmessage'] = true;
387 $object_data['directmessage'] = JsonLD::fetchElement($activity, 'litepub:directMessage');
389 } elseif (in_array($type, array_merge(self::ACTIVITY_TYPES, ['as:Follow', 'litepub:EmojiReact', 'as:View'])) && in_array($object_type, self::CONTENT_TYPES)) {
390 // Create a mostly empty array out of the activity data (instead of the object).
391 // This way we later don't have to check for the existence of each individual array element.
392 $object_data = self::processObject($activity);
393 $object_data['name'] = $type;
394 $object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
395 $object_data['object_id'] = $object_id;
396 $object_data['object_type'] = ''; // Since we don't fetch the object, we don't know the type
397 $object_data['push'] = $push;
398 } elseif (in_array($type, ['as:Add', 'as:Remove'])) {
400 $object_data['id'] = JsonLD::fetchElement($activity, '@id');
401 $object_data['target_id'] = JsonLD::fetchElement($activity, 'as:target', '@id');
402 $object_data['object_id'] = JsonLD::fetchElement($activity, 'as:object', '@id');
403 $object_data['object_type'] = JsonLD::fetchElement($activity['as:object'], '@type');
404 $object_data['object_content'] = JsonLD::fetchElement($activity['as:object'], 'as:content', '@type');
405 $object_data['push'] = $push;
408 $object_data['id'] = JsonLD::fetchElement($activity, '@id');
409 $object_data['object_id'] = JsonLD::fetchElement($activity, 'as:object', '@id');
410 $object_data['object_actor'] = JsonLD::fetchElement($activity['as:object'], 'as:actor', '@id');
411 $object_data['object_object'] = JsonLD::fetchElement($activity['as:object'], 'as:object');
412 $object_data['object_type'] = JsonLD::fetchElement($activity['as:object'], '@type');
413 $object_data['push'] = $push;
415 // An Undo is done on the object of an object, so we need that type as well
416 if (($type == 'as:Undo') && !empty($object_data['object_object'])) {
417 $object_data['object_object_type'] = self::fetchObjectType([], $object_data['object_object'], $fetch_uid);
421 $object_data = self::addActivityFields($object_data, $activity);
423 if (empty($object_data['object_type'])) {
424 $object_data['object_type'] = $object_type;
427 foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
428 if ((empty($object_data['receiver_urls'][$element]) || in_array($element, ['as:bto', 'as:bcc'])) && !empty($urls[$element])) {
429 $object_data['receiver_urls'][$element] = array_unique(array_merge($object_data['receiver_urls'][$element] ?? [], $urls[$element]));
433 $object_data['type'] = $type;
434 $object_data['actor'] = $actor;
435 $object_data['item_receiver'] = $receivers;
436 $object_data['receiver'] = array_replace($object_data['receiver'] ?? [], $receivers);
437 $object_data['reception_type'] = array_replace($object_data['reception_type'] ?? [], $reception_types);
439 $author = $object_data['author'] ?? $actor;
440 if (!empty($author) && !empty($object_data['id'])) {
441 $author_host = parse_url($author, PHP_URL_HOST);
442 $id_host = parse_url($object_data['id'], PHP_URL_HOST);
443 if ($author_host == $id_host) {
444 Logger::info('Valid hosts', ['type' => $type, 'host' => $id_host]);
446 Logger::notice('Differing hosts on author and id', ['type' => $type, 'author' => $author_host, 'id' => $id_host]);
447 $trust_source = false;
451 Logger::info('Processing ' . $object_data['type'] . ' ' . $object_data['object_type'] . ' ' . $object_data['id']);
457 * Fetches the first user id from the receiver array
459 * @param array $receivers Array with receivers
460 * @return integer user id;
462 public static function getFirstUserFromReceivers(array $receivers): int
464 foreach ($receivers as $receiver) {
465 if (!empty($receiver)) {
473 * Processes the activity object
475 * @param array $activity Array with activity data
476 * @param string $body The unprocessed body
477 * @param integer $uid User ID
478 * @param boolean $trust_source Do we trust the source?
479 * @param boolean $push Message had been pushed to our system
480 * @param array $signer The signer of the post
483 public static function processActivity(array $activity, string $body = '', int $uid = null, bool $trust_source = false, bool $push = false, array $signer = [])
485 $type = JsonLD::fetchElement($activity, '@type');
487 Logger::info('Empty type', ['activity' => $activity]);
491 if (!JsonLD::fetchElement($activity, 'as:object', '@id')) {
492 Logger::info('Empty object', ['activity' => $activity]);
496 $actor = JsonLD::fetchElement($activity, 'as:actor', '@id');
498 Logger::info('Empty actor', ['activity' => $activity]);
502 if (is_array($activity['as:object'])) {
503 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
508 // Test the provided signatures against the actor and "attributedTo"
510 if (!empty($attributed_to) && !empty($actor)) {
511 $trust_source = (in_array($actor, $signer) && in_array($attributed_to, $signer));
513 $trust_source = in_array($actor, $signer);
517 // $trust_source is called by reference and is set to true if the content was retrieved successfully
518 $object_data = self::prepareObjectData($activity, $uid, $push, $trust_source);
519 if (empty($object_data)) {
520 Logger::info('No object data found', ['activity' => $activity]);
524 // Lemmy is announcing activities.
525 // We are changing the announces into regular activities.
526 if (($type == 'as:Announce') && in_array($object_data['type'] ?? '', array_merge(self::ACTIVITY_TYPES, ['as:Delete', 'as:Undo', 'as:Update']))) {
527 $type = $object_data['type'];
530 if (!$trust_source) {
531 Logger::info('Activity trust could not be achieved.', ['id' => $object_data['object_id'], 'type' => $type, 'signer' => $signer, 'actor' => $actor, 'attributedTo' => $attributed_to]);
535 if (!empty($body) && empty($object_data['raw'])) {
536 $object_data['raw'] = $body;
539 // Internal flag for thread completion. See Processor.php
540 if (!empty($activity['thread-completion'])) {
541 $object_data['thread-completion'] = $activity['thread-completion'];
544 if (!empty($activity['completion-mode'])) {
545 $object_data['completion-mode'] = $activity['completion-mode'];
548 if (!empty($activity['thread-children-type'])) {
549 $object_data['thread-children-type'] = $activity['thread-children-type'];
552 // Internal flag for posts that arrived via relay
553 if (!empty($activity['from-relay'])) {
554 $object_data['from-relay'] = $activity['from-relay'];
557 if (in_array('as:Question', [$object_data['object_type'] ?? '', $object_data['object_object_type'] ?? ''])) {
558 self::storeUnhandledActivity(false, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
563 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
564 $item = ActivityPub\Processor::createItem($object_data);
565 ActivityPub\Processor::postItem($object_data, $item);
566 } elseif (in_array($object_data['object_type'], ['pt:CacheFile'])) {
567 // Unhandled Peertube activity
569 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
574 if (in_array($object_data['object_type'], ['as:Event'])) {
575 $item = ActivityPub\Processor::createItem($object_data);
576 ActivityPub\Processor::postItem($object_data, $item);
578 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
583 if ($object_data['object_type'] == 'as:tag') {
584 ActivityPub\Processor::addTag($object_data);
585 } elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
586 ActivityPub\Processor::addToFeaturedCollection($object_data);
587 } elseif ($object_data['object_type'] == '') {
588 // The object type couldn't be determined. We don't have it and we can't fetch it. We ignore this activity.
590 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
595 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
596 $object_data['thread-completion'] = Contact::getIdForURL($actor);
597 $object_data['completion-mode'] = self::COMPLETION_ANNOUCE;
599 $item = ActivityPub\Processor::createItem($object_data);
604 $item['post-reason'] = Item::PR_ANNOUNCEMENT;
605 ActivityPub\Processor::postItem($object_data, $item);
607 $announce_object_data = self::processObject($activity);
608 $announce_object_data['name'] = $type;
609 $announce_object_data['author'] = JsonLD::fetchElement($activity, 'as:actor', '@id');
610 $announce_object_data['object_id'] = $object_data['object_id'];
611 $announce_object_data['object_type'] = $object_data['object_type'];
612 $announce_object_data['push'] = $push;
615 $announce_object_data['raw'] = $body;
618 ActivityPub\Processor::createActivity($announce_object_data, Activity::ANNOUNCE);
620 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
625 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
626 ActivityPub\Processor::createActivity($object_data, Activity::LIKE);
627 } elseif ($object_data['object_type'] == '') {
628 // The object type couldn't be determined. We don't have it and we can't fetch it. We ignore this activity.
630 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
635 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
636 ActivityPub\Processor::createActivity($object_data, Activity::DISLIKE);
637 } elseif ($object_data['object_type'] == '') {
638 // The object type couldn't be determined. We don't have it and we can't fetch it. We ignore this activity.
640 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
644 case 'as:TentativeAccept':
645 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
646 ActivityPub\Processor::createActivity($object_data, Activity::ATTENDMAYBE);
648 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
653 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
654 ActivityPub\Processor::updateItem($object_data);
655 } elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
656 ActivityPub\Processor::updatePerson($object_data);
657 } elseif (in_array($object_data['object_type'], ['pt:CacheFile'])) {
658 // Unhandled Peertube activity
660 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
665 if (in_array($object_data['object_type'], array_merge(['as:Tombstone'], self::CONTENT_TYPES))) {
666 ActivityPub\Processor::deleteItem($object_data);
667 } elseif (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
668 ActivityPub\Processor::deletePerson($object_data);
669 } elseif ($object_data['object_type'] == '') {
670 // The object type couldn't be determined. Most likely we don't have it here. We ignore this activity.
672 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
677 if (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
678 ActivityPub\Processor::blockAccount($object_data);
680 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
685 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
686 ActivityPub\Processor::removeFromFeaturedCollection($object_data);
687 } elseif ($object_data['object_type'] == '') {
688 // The object type couldn't be determined. We don't have it and we can't fetch it. We ignore this activity.
690 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
695 if (in_array($object_data['object_type'], self::ACCOUNT_TYPES)) {
696 ActivityPub\Processor::followUser($object_data);
697 } elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
698 $object_data['reply-to-id'] = $object_data['object_id'];
699 ActivityPub\Processor::createActivity($object_data, Activity::FOLLOW);
701 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
706 if ($object_data['object_type'] == 'as:Follow') {
707 ActivityPub\Processor::acceptFollowUser($object_data);
708 } elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
709 ActivityPub\Processor::createActivity($object_data, Activity::ATTEND);
711 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
716 if ($object_data['object_type'] == 'as:Follow') {
717 ActivityPub\Processor::rejectFollowUser($object_data);
718 } elseif (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
719 ActivityPub\Processor::createActivity($object_data, Activity::ATTENDNO);
721 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
726 if (($object_data['object_type'] == 'as:Follow') &&
727 in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
728 ActivityPub\Processor::undoFollowUser($object_data);
729 } elseif (($object_data['object_type'] == 'as:Follow') &&
730 in_array($object_data['object_object_type'], self::CONTENT_TYPES)) {
731 ActivityPub\Processor::undoActivity($object_data);
732 } elseif (($object_data['object_type'] == 'as:Accept') &&
733 in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
734 ActivityPub\Processor::rejectFollowUser($object_data);
735 } elseif (($object_data['object_type'] == 'as:Block') &&
736 in_array($object_data['object_object_type'], self::ACCOUNT_TYPES)) {
737 ActivityPub\Processor::unblockAccount($object_data);
738 } elseif (in_array($object_data['object_type'], array_merge(self::ACTIVITY_TYPES, ['as:Announce'])) &&
739 in_array($object_data['object_object_type'], array_merge(['as:Tombstone'], self::CONTENT_TYPES))) {
740 ActivityPub\Processor::undoActivity($object_data);
741 } elseif (in_array($object_data['object_type'], array_merge(self::ACTIVITY_TYPES, ['as:Announce', 'as:Create', ''])) &&
742 empty($object_data['object_object_type'])) {
743 // We cannot detect the target object. So we can ignore it.
744 } elseif (in_array($object_data['object_type'], ['as:Create']) &&
745 in_array($object_data['object_object_type'], ['pt:CacheFile'])) {
746 // Unhandled Peertube activity
748 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
753 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
754 ActivityPub\Processor::createActivity($object_data, Activity::VIEW);
755 } elseif ($object_data['object_type'] == '') {
756 // The object type couldn't be determined. Most likely we don't have it here. We ignore this activity.
758 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
762 case 'litepub:EmojiReact':
763 if (in_array($object_data['object_type'], self::CONTENT_TYPES)) {
764 ActivityPub\Processor::createActivity($object_data, Activity::EMOJIREACT);
765 } elseif ($object_data['object_type'] == '') {
766 // The object type couldn't be determined. We don't have it and we can't fetch it. We ignore this activity.
768 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
773 Logger::info('Unknown activity: ' . $type . ' ' . $object_data['object_type']);
774 self::storeUnhandledActivity(true, $type, $object_data, $activity, $body, $uid, $trust_source, $push, $signer);
780 * Stores unhandled or unknown Activities as a file
782 * @param boolean $unknown "true" if the activity is unknown, "false" if it is unhandled
783 * @param string $type Activity type
784 * @param array $object_data Preprocessed array that is generated out of the received activity
785 * @param array $activity Array with activity data
786 * @param string $body The unprocessed body
787 * @param integer $uid User ID
788 * @param boolean $trust_source Do we trust the source?
789 * @param boolean $push Message had been pushed to our system
790 * @param array $signer The signer of the post
793 private static function storeUnhandledActivity(bool $unknown, string $type, array $object_data, array $activity, string $body = '', int $uid = null, bool $trust_source = false, bool $push = false, array $signer = [])
795 if (!DI::config()->get('debug', 'ap_log_unknown')) {
799 $file = ($unknown ? 'unknown-' : 'unhandled-') . str_replace(':', '-', $type) . '-';
801 if (!empty($object_data['object_type'])) {
802 $file .= str_replace(':', '-', $object_data['object_type']) . '-';
805 if (!empty($object_data['object_object_type'])) {
806 $file .= str_replace(':', '-', $object_data['object_object_type']) . '-';
809 $tempfile = tempnam(System::getTempPath(), $file);
810 file_put_contents($tempfile, json_encode(['activity' => $activity, 'body' => $body, 'uid' => $uid, 'trust_source' => $trust_source, 'push' => $push, 'signer' => $signer, 'object_data' => $object_data], JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT));
811 Logger::notice('Unknown activity stored', ['type' => $type, 'object_type' => $object_data['object_type'], $object_data['object_object_type'] ?? '', 'file' => $tempfile]);
815 * Fetch a user id from an activity array
817 * @param array $activity
818 * @param string $actor
820 * @return int user id
822 public static function getBestUserForActivity(array $activity): int
825 $actor = JsonLD::fetchElement($activity, 'as:actor', '@id') ?? '';
827 $receivers = self::getReceivers($activity, $actor);
828 foreach ($receivers as $receiver) {
829 if ($receiver['type'] == self::TARGET_GLOBAL) {
832 if (empty($uid) || ($receiver['type'] == self::TARGET_TO)) {
833 $uid = $receiver['uid'];
837 // When we haven't found any user yet, we just chose a user who most likely could have access to the content
839 $contact = Contact::selectFirst(['uid'], ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND]]);
840 if (!empty($contact['uid'])) {
841 $uid = $contact['uid'];
848 // @TODO Missing documentation
849 public static function getReceiverURL(array $activity): array
853 foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
854 $receiver_list = JsonLD::fetchElementArray($activity, $element, '@id');
855 if (empty($receiver_list)) {
859 foreach ($receiver_list as $receiver) {
860 if ($receiver == self::PUBLIC_COLLECTION) {
861 $receiver = ActivityPub::PUBLIC_COLLECTION;
863 $urls[$element][] = $receiver;
871 * Fetch the receiver list from an activity array
873 * @param array $activity
874 * @param string $actor
876 * @param boolean $fetch_unlisted
878 * @return array with receivers (user id)
881 private static function getReceivers(array $activity, string $actor, array $tags = [], bool $fetch_unlisted = false): array
883 $reply = $receivers = $profile = [];
885 // When it is an answer, we inherite the receivers from the parent
886 $replyto = JsonLD::fetchElement($activity, 'as:inReplyTo', '@id');
887 if (!empty($replyto)) {
890 // Fix possibly wrong item URI (could be an answer to a plink uri)
891 $fixedReplyTo = Item::getURIByLink($replyto);
892 if (!empty($fixedReplyTo)) {
893 $reply[] = $fixedReplyTo;
897 // Fetch all posts that refer to the object id
898 $object_id = JsonLD::fetchElement($activity, 'as:object', '@id');
899 if (!empty($object_id)) {
900 $reply[] = $object_id;
903 if (!empty($reply)) {
904 $parents = Post::select(['uid'], ['uri' => $reply]);
905 while ($parent = Post::fetch($parents)) {
906 $receivers[$parent['uid']] = ['uid' => $parent['uid'], 'type' => self::TARGET_ANSWER];
908 DBA::close($parents);
911 if (!empty($actor)) {
912 $profile = APContact::getByURL($actor);
913 $followers = $profile['followers'] ?? '';
914 $is_forum = ($actor['type'] ?? '') == 'Group';
915 Logger::info('Got actor and followers', ['actor' => $actor, 'followers' => $followers]);
917 Logger::info('Empty actor', ['activity' => $activity]);
922 // We have to prevent false follower assumptions upon thread completions
923 $follower_target = empty($activity['thread-completion']) ? self::TARGET_FOLLOWER : self::TARGET_UNKNOWN;
925 foreach (['as:to', 'as:cc', 'as:bto', 'as:bcc'] as $element) {
926 $receiver_list = JsonLD::fetchElementArray($activity, $element, '@id');
927 if (empty($receiver_list)) {
931 foreach ($receiver_list as $receiver) {
932 if ($receiver == self::PUBLIC_COLLECTION) {
933 $receivers[0] = ['uid' => 0, 'type' => self::TARGET_GLOBAL];
936 // Add receiver "-1" for unlisted posts
937 if ($fetch_unlisted && ($receiver == self::PUBLIC_COLLECTION) && ($element == 'as:cc')) {
938 $receivers[-1] = ['uid' => -1, 'type' => self::TARGET_GLOBAL];
941 // Fetch the receivers for the public and the followers collection
942 if ((($receiver == $followers) || (($receiver == self::PUBLIC_COLLECTION) && !$is_forum)) && !empty($actor)) {
943 $receivers = self::getReceiverForActor($actor, $tags, $receivers, $follower_target, $profile);
947 // Fetching all directly addressed receivers
948 $condition = ['self' => true, 'nurl' => Strings::normaliseLink($receiver)];
949 $contact = DBA::selectFirst('contact', ['uid', 'contact-type'], $condition);
950 if (!DBA::isResult($contact)) {
954 // Check if the potential receiver is following the actor
955 // Exception: The receiver is targetted via "to" or this is a comment
956 if ((($element != 'as:to') && empty($replyto)) || ($contact['contact-type'] == Contact::TYPE_COMMUNITY)) {
957 $networks = Protocol::FEDERATED;
958 $condition = ['nurl' => Strings::normaliseLink($actor), 'rel' => [Contact::SHARING, Contact::FRIEND],
959 'network' => $networks, 'archive' => false, 'pending' => false, 'uid' => $contact['uid']];
961 // Forum posts are only accepted from forum contacts
962 if ($contact['contact-type'] == Contact::TYPE_COMMUNITY) {
963 $condition['rel'] = [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER];
966 if (!DBA::exists('contact', $condition)) {
971 $type = $receivers[$contact['uid']]['type'] ?? self::TARGET_UNKNOWN;
972 if (in_array($type, [self::TARGET_UNKNOWN, self::TARGET_FOLLOWER, self::TARGET_ANSWER, self::TARGET_GLOBAL])) {
975 $type = self::TARGET_TO;
978 $type = self::TARGET_CC;
981 $type = self::TARGET_BTO;
984 $type = self::TARGET_BCC;
988 $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $type];
993 self::switchContacts($receivers, $actor);
999 * Fetch the receiver list of a given actor
1001 * @param string $actor
1002 * @param array $tags
1003 * @param array $receivers
1004 * @param integer $target_type
1005 * @param array $profile
1007 * @return array with receivers (user id)
1008 * @throws \Exception
1010 private static function getReceiverForActor(string $actor, array $tags, array $receivers, int $target_type, array $profile): array
1012 $basecondition = ['rel' => [Contact::SHARING, Contact::FRIEND, Contact::FOLLOWER],
1013 'network' => Protocol::FEDERATED, 'archive' => false, 'pending' => false];
1015 if (!empty($profile['uri-id'])) {
1016 $condition = DBA::mergeConditions($basecondition, ["`uri-id` = ? AND `uid` != ?", $profile['uri-id'], 0]);
1017 $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
1018 while ($contact = DBA::fetch($contacts)) {
1019 if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
1020 $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
1023 DBA::close($contacts);
1025 // This part will only be called while post update 1426 wasn't finished
1026 $condition = DBA::mergeConditions($basecondition, ["`nurl` = ? AND `uid` != ?", Strings::normaliseLink($actor), 0]);
1027 $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
1028 while ($contact = DBA::fetch($contacts)) {
1029 if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
1030 $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
1033 DBA::close($contacts);
1035 // The queries are split because of performance issues
1036 $condition = DBA::mergeConditions($basecondition, ["`alias` IN (?, ?) AND `uid` != ?", Strings::normaliseLink($actor), $actor, 0]);
1037 $contacts = DBA::select('contact', ['uid', 'rel'], $condition);
1038 while ($contact = DBA::fetch($contacts)) {
1039 if (empty($receivers[$contact['uid']]) && self::isValidReceiverForActor($contact, $tags)) {
1040 $receivers[$contact['uid']] = ['uid' => $contact['uid'], 'type' => $target_type];
1043 DBA::close($contacts);
1049 * Tests if the contact is a valid receiver for this actor
1051 * @param array $contact
1052 * @param array $tags
1054 * @return bool with receivers (user id)
1055 * @throws \Exception
1057 private static function isValidReceiverForActor(array $contact, array $tags): bool
1059 // Are we following the contact? Then this is a valid receiver
1060 if (in_array($contact['rel'], [Contact::SHARING, Contact::FRIEND])) {
1064 // When the possible receiver isn't a community, then it is no valid receiver
1065 $owner = User::getOwnerDataById($contact['uid']);
1066 if (empty($owner) || ($owner['contact-type'] != Contact::TYPE_COMMUNITY)) {
1070 // Is the community account tagged?
1071 foreach ($tags as $tag) {
1072 if ($tag['type'] != 'Mention') {
1076 if (Strings::compareLink($tag['href'], $owner['url'])) {
1085 * Switches existing contacts to ActivityPub
1087 * @param integer $cid Contact ID
1088 * @param integer $uid User ID
1089 * @param string $url Profile URL
1090 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1091 * @throws \ImagickException
1093 public static function switchContact(int $cid, int $uid, string $url)
1095 if (DBA::exists('contact', ['id' => $cid, 'network' => Protocol::ACTIVITYPUB])) {
1096 Logger::info('Contact is already ActivityPub', ['id' => $cid, 'uid' => $uid, 'url' => $url]);
1100 if (Contact::updateFromProbe($cid)) {
1101 Logger::info('Update was successful', ['id' => $cid, 'uid' => $uid, 'url' => $url]);
1104 // Send a new follow request to be sure that the connection still exists
1105 if (($uid != 0) && DBA::exists('contact', ['id' => $cid, 'rel' => [Contact::SHARING, Contact::FRIEND], 'network' => Protocol::ACTIVITYPUB])) {
1106 Logger::info('Contact had been switched to ActivityPub. Sending a new follow request.', ['uid' => $uid, 'url' => $url]);
1107 ActivityPub\Transmitter::sendActivity('Follow', $url, $uid);
1112 * @TODO Fix documentation and type-hints
1116 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1117 * @throws \ImagickException
1119 private static function switchContacts($receivers, $actor)
1121 if (empty($actor)) {
1125 foreach ($receivers as $receiver) {
1126 $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver['uid'], 'network' => Protocol::OSTATUS, 'nurl' => Strings::normaliseLink($actor)]);
1127 if (DBA::isResult($contact)) {
1128 self::switchContact($contact['id'], $receiver['uid'], $actor);
1131 $contact = DBA::selectFirst('contact', ['id'], ['uid' => $receiver['uid'], 'network' => Protocol::OSTATUS, 'alias' => [Strings::normaliseLink($actor), $actor]]);
1132 if (DBA::isResult($contact)) {
1133 self::switchContact($contact['id'], $receiver['uid'], $actor);
1139 * @TODO Fix documentation and type-hints
1141 * @param $object_data
1142 * @param array $activity
1146 private static function addActivityFields($object_data, array $activity)
1148 if (!empty($activity['published']) && empty($object_data['published'])) {
1149 $object_data['published'] = JsonLD::fetchElement($activity, 'as:published', '@value');
1152 if (!empty($activity['diaspora:guid']) && empty($object_data['diaspora:guid'])) {
1153 $object_data['diaspora:guid'] = JsonLD::fetchElement($activity, 'diaspora:guid', '@value');
1156 $object_data['service'] = JsonLD::fetchElement($activity, 'as:instrument', 'as:name', '@type', 'as:Service');
1157 $object_data['service'] = JsonLD::fetchElement($object_data, 'service', '@value');
1159 if (!empty($object_data['object_id'])) {
1160 // Some systems (e.g. GNU Social) don't reply to the "id" field but the "uri" field.
1161 $objectId = Item::getURIByLink($object_data['object_id']);
1162 if (!empty($objectId) && ($object_data['object_id'] != $objectId)) {
1163 Logger::notice('Fix wrong object-id', ['received' => $object_data['object_id'], 'correct' => $objectId]);
1164 $object_data['object_id'] = $objectId;
1168 return $object_data;
1172 * Fetches the object data from external ressources if needed
1174 * @param string $object_id Object ID of the the provided object
1175 * @param array $object The provided object array
1176 * @param boolean $trust_source Do we trust the provided object?
1177 * @param integer $uid User ID for the signature that we use to fetch data
1179 * @return array|false with trusted and valid object data
1180 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1181 * @throws \ImagickException
1183 private static function fetchObject(string $object_id, array $object = [], bool $trust_source = false, int $uid = 0)
1185 // By fetching the type we check if the object is complete.
1186 $type = JsonLD::fetchElement($object, '@type');
1188 if (!$trust_source || empty($type)) {
1189 $data = ActivityPub::fetchContent($object_id, $uid);
1190 if (!empty($data)) {
1191 $object = JsonLD::compact($data);
1192 Logger::info('Fetched content for ' . $object_id);
1194 Logger::info('Empty content for ' . $object_id . ', check if content is available locally.');
1196 $item = Post::selectFirst(Item::DELIVER_FIELDLIST, ['uri' => $object_id]);
1197 if (!DBA::isResult($item)) {
1198 Logger::info('Object with url ' . $object_id . ' was not found locally.');
1201 Logger::info('Using already stored item for url ' . $object_id);
1202 $data = ActivityPub\Transmitter::createNote($item);
1203 $object = JsonLD::compact($data);
1206 $id = JsonLD::fetchElement($object, '@id');
1208 Logger::info('Empty id');
1212 if ($id != $object_id) {
1213 Logger::info('Fetched id differs from provided id', ['provided' => $object_id, 'fetched' => $id]);
1217 Logger::info('Using original object for url ' . $object_id);
1220 $type = JsonLD::fetchElement($object, '@type');
1222 Logger::info('Empty type');
1226 // Lemmy is resharing "create" activities instead of content
1227 // We fetch the content from the activity.
1228 if (in_array($type, ['as:Create'])) {
1229 $object = $object['as:object'];
1230 $type = JsonLD::fetchElement($object, '@type');
1232 Logger::info('Empty type');
1235 $object_data = self::processObject($object);
1238 // We currently don't handle 'pt:CacheFile', but with this step we avoid logging
1239 if (in_array($type, self::CONTENT_TYPES) || ($type == 'pt:CacheFile')) {
1240 $object_data = self::processObject($object);
1242 if (!empty($data)) {
1243 $object_data['raw'] = json_encode($data);
1245 return $object_data;
1248 if ($type == 'as:Announce') {
1249 $object_id = JsonLD::fetchElement($object, 'object', '@id');
1250 if (empty($object_id) || !is_string($object_id)) {
1253 return self::fetchObject($object_id, [], false, $uid);
1256 Logger::info('Unhandled object type: ' . $type);
1261 * Converts the language element (Used by Peertube)
1263 * @param array $languages
1264 * @return array Languages
1266 public static function processLanguages(array $languages): array
1268 if (empty($languages)) {
1272 $language_list = [];
1274 foreach ($languages as $language) {
1275 if (!empty($language['_:identifier']) && !empty($language['as:name'])) {
1276 $language_list[$language['_:identifier']] = $language['as:name'];
1279 return $language_list;
1283 * Convert tags from JSON-LD format into a simplified format
1285 * @param array $tags Tags in JSON-LD format
1287 * @return array with tags in a simplified format
1289 public static function processTags(array $tags): array
1293 foreach ($tags as $tag) {
1298 $element = ['type' => str_replace('as:', '', JsonLD::fetchElement($tag, '@type')),
1299 'href' => JsonLD::fetchElement($tag, 'as:href', '@id'),
1300 'name' => JsonLD::fetchElement($tag, 'as:name', '@value')];
1302 if (empty($element['type'])) {
1306 if (empty($element['href'])) {
1307 $element['href'] = $element['name'];
1310 $taglist[] = $element;
1316 * Convert emojis from JSON-LD format into a simplified format
1318 * @param array $emojis
1319 * @return array with emojis in a simplified format
1321 private static function processEmojis(array $emojis): array
1325 foreach ($emojis as $emoji) {
1326 if (empty($emoji) || (JsonLD::fetchElement($emoji, '@type') != 'toot:Emoji') || empty($emoji['as:icon'])) {
1330 $url = JsonLD::fetchElement($emoji['as:icon'], 'as:url', '@id');
1331 $element = ['name' => JsonLD::fetchElement($emoji, 'as:name', '@value'),
1334 $emojilist[] = $element;
1341 * Convert attachments from JSON-LD format into a simplified format
1343 * @param array $attachments Attachments in JSON-LD format
1345 * @return array Attachments in a simplified format
1347 private static function processAttachments(array $attachments): array
1351 // Removes empty values
1352 $attachments = array_filter($attachments);
1354 foreach ($attachments as $attachment) {
1355 switch (JsonLD::fetchElement($attachment, '@type')) {
1360 $urls = JsonLD::fetchElementArray($attachment, 'as:url');
1361 foreach ($urls as $url) {
1362 // Single scalar URL case
1363 if (is_string($url)) {
1368 $href = JsonLD::fetchElement($url, 'as:href', '@id');
1369 $mediaType = JsonLD::fetchElement($url, 'as:mediaType', '@value');
1370 if (Strings::startsWith($mediaType, 'image')) {
1379 'title' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
1380 'desc' => JsonLD::fetchElement($attachment, 'as:summary', '@value'),
1382 'image' => $pageImage,
1386 $mediaType = JsonLD::fetchElement($attachment, 'as:mediaType', '@value');
1387 $imageFullUrl = JsonLD::fetchElement($attachment, 'as:url', '@id');
1388 $imagePreviewUrl = null;
1390 if (!$imageFullUrl && ($urls = JsonLD::fetchElementArray($attachment, 'as:url'))) {
1391 $imageVariants = [];
1392 $previewVariants = [];
1393 foreach ($urls as $url) {
1394 // Scalar URL, no discrimination possible
1395 if (is_string($url)) {
1396 $imageFullUrl = $url;
1400 // Not sure what to do with a different Link media type than the base Image, we skip
1401 if ($mediaType != JsonLD::fetchElement($url, 'as:mediaType', '@value')) {
1405 $href = JsonLD::fetchElement($url, 'as:href', '@id');
1407 // Default URL choice if no discriminating width is provided
1408 $imageFullUrl = $href ?? $imageFullUrl;
1410 $width = intval(JsonLD::fetchElement($url, 'as:width', '@value') ?? 1);
1412 if ($href && $width) {
1413 $imageVariants[$width] = $href;
1414 // 632 is the ideal width for full screen frio posts, we compute the absolute distance to it
1415 $previewVariants[abs(632 - $width)] = $href;
1419 if ($imageVariants) {
1420 // Taking the maximum size image
1421 ksort($imageVariants);
1422 $imageFullUrl = array_pop($imageVariants);
1424 // Taking the minimum number distance to the target distance
1425 ksort($previewVariants);
1426 $imagePreviewUrl = array_shift($previewVariants);
1429 unset($imageVariants);
1430 unset($previewVariants);
1434 'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
1435 'mediaType' => $mediaType,
1436 'name' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
1437 'url' => $imageFullUrl,
1438 'image' => $imagePreviewUrl !== $imageFullUrl ? $imagePreviewUrl : null,
1443 'type' => str_replace('as:', '', JsonLD::fetchElement($attachment, '@type')),
1444 'mediaType' => JsonLD::fetchElement($attachment, 'as:mediaType', '@value'),
1445 'name' => JsonLD::fetchElement($attachment, 'as:name', '@value'),
1446 'url' => JsonLD::fetchElement($attachment, 'as:url', '@id'),
1447 'height' => JsonLD::fetchElement($attachment, 'as:height', '@value'),
1448 'width' => JsonLD::fetchElement($attachment, 'as:width', '@value'),
1449 'image' => JsonLD::fetchElement($attachment, 'as:image', '@id')
1458 * Convert questions from JSON-LD format into a simplified format
1460 * @param array $object
1462 * @return array Questions in a simplified format
1464 private static function processQuestion(array $object): array
1468 if (!empty($object['as:oneOf'])) {
1469 $question['multiple'] = false;
1470 $options = JsonLD::fetchElementArray($object, 'as:oneOf') ?? [];
1471 } elseif (!empty($object['as:anyOf'])) {
1472 $question['multiple'] = true;
1473 $options = JsonLD::fetchElementArray($object, 'as:anyOf') ?? [];
1478 $closed = JsonLD::fetchElement($object, 'as:closed', '@value');
1479 if (!empty($closed)) {
1480 $question['end-time'] = $closed;
1482 $question['end-time'] = JsonLD::fetchElement($object, 'as:endTime', '@value');
1485 $question['voters'] = (int)JsonLD::fetchElement($object, 'toot:votersCount', '@value');
1486 $question['options'] = [];
1490 foreach ($options as $option) {
1491 if (JsonLD::fetchElement($option, '@type') != 'as:Note') {
1495 $name = JsonLD::fetchElement($option, 'as:name', '@value');
1497 if (empty($option['as:replies'])) {
1501 $replies = JsonLD::fetchElement($option['as:replies'], 'as:totalItems', '@value');
1503 $question['options'][] = ['name' => $name, 'replies' => $replies];
1505 $voters += (int)$replies;
1508 // For single choice question we can count the number of voters if not provided (like with Misskey)
1509 if (empty($question['voters']) && !$question['multiple']) {
1510 $question['voters'] = $voters;
1517 * Fetch the original source or content with the "language" Markdown or HTML
1519 * @param array $object
1520 * @param array $object_data
1522 * @return array Object data (?)
1523 * @throws \Exception
1525 private static function getSource(array $object, array $object_data): array
1527 $object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/bbcode');
1528 $object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
1529 if (!empty($object_data['source'])) {
1530 return $object_data;
1533 $object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/markdown');
1534 $object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
1535 if (!empty($object_data['source'])) {
1536 $object_data['source'] = Markdown::toBBCode($object_data['source']);
1537 return $object_data;
1540 $object_data['source'] = JsonLD::fetchElement($object, 'as:source', 'as:content', 'as:mediaType', 'text/html');
1541 $object_data['source'] = JsonLD::fetchElement($object_data, 'source', '@value');
1542 if (!empty($object_data['source'])) {
1543 $object_data['source'] = HTML::toBBCode($object_data['source']);
1544 return $object_data;
1547 return $object_data;
1551 * Extracts a potential alternate URL from a list of additional URL elements
1553 * @param array $urls
1556 private static function extractAlternateUrl(array $urls): string
1559 foreach ($urls as $key => $url) {
1560 // Not a list but a single URL element
1561 if (!is_numeric($key)) {
1565 if (empty($url['@type']) || ($url['@type'] != 'as:Link')) {
1569 $href = JsonLD::fetchElement($url, 'as:href', '@id');
1574 $mediatype = JsonLD::fetchElement($url, 'as:mediaType');
1575 if (empty($mediatype)) {
1579 if ($mediatype == 'text/html') {
1580 $alternateUrl = $href;
1584 return $alternateUrl;
1588 * Check if the "as:url" element is an array with multiple links
1589 * This is the case with audio and video posts.
1590 * Then the links are added as attachments
1592 * @param array $urls The object URL list
1593 * @return array an array of attachments
1595 private static function processAttachmentUrls(array $urls): array
1598 foreach ($urls as $key => $url) {
1599 // Not a list but a single URL element
1600 if (!is_numeric($key)) {
1604 if (empty($url['@type']) || ($url['@type'] != 'as:Link')) {
1608 $href = JsonLD::fetchElement($url, 'as:href', '@id');
1613 $mediatype = JsonLD::fetchElement($url, 'as:mediaType');
1614 if (empty($mediatype)) {
1618 $filetype = strtolower(substr($mediatype, 0, strpos($mediatype, '/')));
1620 if ($filetype == 'audio') {
1621 $attachments[] = ['type' => $filetype, 'mediaType' => $mediatype, 'url' => $href, 'height' => null, 'size' => null, 'name' => ''];
1622 } elseif ($filetype == 'video') {
1623 $height = (int)JsonLD::fetchElement($url, 'as:height', '@value');
1624 // PeerTube audio-only track
1625 if ($height === 0) {
1629 $size = (int)JsonLD::fetchElement($url, 'pt:size', '@value');
1630 $attachments[] = ['type' => $filetype, 'mediaType' => $mediatype, 'url' => $href, 'height' => $height, 'size' => $size, 'name' => ''];
1631 } elseif (in_array($mediatype, ['application/x-bittorrent', 'application/x-bittorrent;x-scheme-handler/magnet'])) {
1632 $height = (int)JsonLD::fetchElement($url, 'as:height', '@value');
1634 // For Torrent links we always store the highest resolution
1635 if (!empty($attachments[$mediatype]['height']) && ($height < $attachments[$mediatype]['height'])) {
1639 $attachments[$mediatype] = ['type' => $mediatype, 'mediaType' => $mediatype, 'url' => $href, 'height' => $height, 'size' => null, 'name' => ''];
1640 } elseif ($mediatype == 'application/x-mpegURL') {
1641 // PeerTube exception, actual video link is in the tags of this URL element
1642 $attachments = array_merge($attachments, self::processAttachmentUrls($url['as:tag']));
1646 return array_values($attachments);
1650 * Fetches data from the object part of an activity
1652 * @param array $object
1654 * @return array|bool Object data or FALSE if $object does not contain @id element
1655 * @throws \Exception
1657 private static function processObject(array $object)
1659 if (!JsonLD::fetchElement($object, '@id')) {
1664 $object_data['object_type'] = JsonLD::fetchElement($object, '@type');
1665 $object_data['id'] = JsonLD::fetchElement($object, '@id');
1666 $object_data['reply-to-id'] = JsonLD::fetchElement($object, 'as:inReplyTo', '@id');
1668 // An empty "id" field is translated to "./" by the compactor, so we have to check for this content
1669 if (empty($object_data['reply-to-id']) || ($object_data['reply-to-id'] == './')) {
1670 $object_data['reply-to-id'] = $object_data['id'];
1672 // On activities the "reply to" is the id of the object it refers to
1673 if (in_array($object_data['object_type'], self::ACTIVITY_TYPES)) {
1674 $object_id = JsonLD::fetchElement($object, 'as:object', '@id');
1675 if (!empty($object_id)) {
1676 $object_data['reply-to-id'] = $object_id;
1680 // Some systems (e.g. GNU Social) don't reply to the "id" field but the "uri" field.
1681 $replyToId = Item::getURIByLink($object_data['reply-to-id']);
1682 if (!empty($replyToId) && ($object_data['reply-to-id'] != $replyToId)) {
1683 Logger::notice('Fix wrong reply-to', ['received' => $object_data['reply-to-id'], 'correct' => $replyToId]);
1684 $object_data['reply-to-id'] = $replyToId;
1688 $object_data['published'] = JsonLD::fetchElement($object, 'as:published', '@value');
1689 $object_data['updated'] = JsonLD::fetchElement($object, 'as:updated', '@value');
1691 if (empty($object_data['updated'])) {
1692 $object_data['updated'] = $object_data['published'];
1695 if (empty($object_data['published']) && !empty($object_data['updated'])) {
1696 $object_data['published'] = $object_data['updated'];
1699 $actor = JsonLD::fetchElement($object, 'as:attributedTo', '@id');
1700 if (empty($actor)) {
1701 $actor = JsonLD::fetchElement($object, 'as:actor', '@id');
1704 $location = JsonLD::fetchElement($object, 'as:location', 'as:name', '@type', 'as:Place');
1705 $location = JsonLD::fetchElement($location, 'location', '@value');
1707 // Some AP software allow formatted text in post location, so we run all the text converters we have to boil
1708 // down to HTML and then finally format to plaintext.
1709 $location = Markdown::convert($location);
1710 $location = BBCode::toPlaintext($location);
1713 $object_data['sc:identifier'] = JsonLD::fetchElement($object, 'sc:identifier', '@value');
1714 $object_data['diaspora:guid'] = JsonLD::fetchElement($object, 'diaspora:guid', '@value');
1715 $object_data['diaspora:comment'] = JsonLD::fetchElement($object, 'diaspora:comment', '@value');
1716 $object_data['diaspora:like'] = JsonLD::fetchElement($object, 'diaspora:like', '@value');
1717 $object_data['actor'] = $object_data['author'] = $actor;
1718 $object_data['context'] = JsonLD::fetchElement($object, 'as:context', '@id');
1719 $object_data['conversation'] = JsonLD::fetchElement($object, 'ostatus:conversation', '@id');
1720 $object_data['sensitive'] = JsonLD::fetchElement($object, 'as:sensitive');
1721 $object_data['name'] = JsonLD::fetchElement($object, 'as:name', '@value');
1722 $object_data['summary'] = JsonLD::fetchElement($object, 'as:summary', '@value');
1723 $object_data['content'] = JsonLD::fetchElement($object, 'as:content', '@value');
1724 $object_data['mediatype'] = JsonLD::fetchElement($object, 'as:mediaType', '@value');
1725 $object_data = self::getSource($object, $object_data);
1726 $object_data['start-time'] = JsonLD::fetchElement($object, 'as:startTime', '@value');
1727 $object_data['end-time'] = JsonLD::fetchElement($object, 'as:endTime', '@value');
1728 $object_data['location'] = $location;
1729 $object_data['latitude'] = JsonLD::fetchElement($object, 'as:location', 'as:latitude', '@type', 'as:Place');
1730 $object_data['latitude'] = JsonLD::fetchElement($object_data, 'latitude', '@value');
1731 $object_data['longitude'] = JsonLD::fetchElement($object, 'as:location', 'as:longitude', '@type', 'as:Place');
1732 $object_data['longitude'] = JsonLD::fetchElement($object_data, 'longitude', '@value');
1733 $object_data['attachments'] = self::processAttachments(JsonLD::fetchElementArray($object, 'as:attachment') ?? []);
1734 $object_data['tags'] = self::processTags(JsonLD::fetchElementArray($object, 'as:tag') ?? []);
1735 $object_data['emojis'] = self::processEmojis(JsonLD::fetchElementArray($object, 'as:tag', null, '@type', 'toot:Emoji') ?? []);
1736 $object_data['languages'] = self::processLanguages(JsonLD::fetchElementArray($object, 'sc:inLanguage') ?? []);
1737 $object_data['generator'] = JsonLD::fetchElement($object, 'as:generator', 'as:name', '@type', 'as:Application');
1738 $object_data['generator'] = JsonLD::fetchElement($object_data, 'generator', '@value');
1739 $object_data['alternate-url'] = JsonLD::fetchElement($object, 'as:url', '@id');
1741 // Special treatment for Hubzilla links
1742 if (is_array($object_data['alternate-url'])) {
1743 $object_data['alternate-url'] = JsonLD::fetchElement($object_data['alternate-url'], 'as:href', '@id');
1745 if (!is_string($object_data['alternate-url'])) {
1746 $object_data['alternate-url'] = JsonLD::fetchElement($object['as:url'], 'as:href', '@id');
1750 if (!empty($object_data['alternate-url']) && !Network::isValidHttpUrl($object_data['alternate-url'])) {
1751 $object_data['alternate-url'] = null;
1754 if (in_array($object_data['object_type'], ['as:Audio', 'as:Video'])) {
1755 $object_data['alternate-url'] = self::extractAlternateUrl($object['as:url'] ?? []) ?: $object_data['alternate-url'];
1756 $object_data['attachments'] = array_merge($object_data['attachments'], self::processAttachmentUrls($object['as:url'] ?? []));
1759 // For page types we expect that the alternate url posts to some page.
1760 // So we add this to the attachments if it differs from the id.
1761 // Currently only Lemmy is using the page type.
1762 if (($object_data['object_type'] == 'as:Page') && !empty($object_data['alternate-url']) && !Strings::compareLink($object_data['alternate-url'], $object_data['id'])) {
1763 $object_data['attachments'][] = ['url' => $object_data['alternate-url']];
1764 $object_data['alternate-url'] = null;
1767 if ($object_data['object_type'] == 'as:Question') {
1768 $object_data['question'] = self::processQuestion($object);
1771 $receiverdata = self::getReceivers($object, $object_data['actor'] ?? '', $object_data['tags'], true);
1772 $receivers = $reception_types = [];
1773 foreach ($receiverdata as $key => $data) {
1774 $receivers[$key] = $data['uid'];
1775 $reception_types[$data['uid']] = $data['type'] ?? 0;
1778 $object_data['receiver_urls'] = self::getReceiverURL($object);
1779 $object_data['receiver'] = $receivers;
1780 $object_data['reception_type'] = $reception_types;
1782 $object_data['unlisted'] = in_array(-1, $object_data['receiver']);
1783 unset($object_data['receiver'][-1]);
1784 unset($object_data['reception_type'][-1]);
1786 // Common object data:
1789 // @context, type, actor, signature, mediaType, duration, replies, icon
1791 // Also missing: (Defined in the standard, but currently unused)
1792 // audience, preview, endTime, startTime, image
1797 // contentMap, announcement_count, announcements, context_id, likes, like_count
1798 // inReplyToStatusId, shares, quoteUrl, statusnetConversationId
1803 // category, licence, language, commentsEnabled
1806 // views, waitTranscoding, state, support, subtitleLanguage
1807 // likes, dislikes, shares, comments
1809 return $object_data;