3 * @copyright Copyright (C) 2020, Friendica
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\PageInfo;
25 use Friendica\Content\Text\BBCode;
26 use Friendica\Content\Text\HTML;
27 use Friendica\Core\Logger;
28 use Friendica\Core\Protocol;
29 use Friendica\Database\DBA;
31 use Friendica\Model\APContact;
32 use Friendica\Model\Contact;
33 use Friendica\Model\Conversation;
34 use Friendica\Model\Event;
35 use Friendica\Model\Item;
36 use Friendica\Model\ItemURI;
37 use Friendica\Model\Mail;
38 use Friendica\Model\Tag;
39 use Friendica\Model\User;
40 use Friendica\Model\Post;
41 use Friendica\Protocol\Activity;
42 use Friendica\Protocol\ActivityPub;
43 use Friendica\Protocol\Relay;
44 use Friendica\Util\DateTimeFormat;
45 use Friendica\Util\JsonLD;
46 use Friendica\Util\Strings;
49 * ActivityPub Processor Protocol class
54 * Converts mentions from Pleroma into the Friendica format
58 * @return string converted body
60 private static function convertMentions($body)
62 $URLSearchString = "^\[\]";
63 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
69 * Replaces emojis in the body
71 * @param array $emojis
74 * @return string with replaced emojis
76 private static function replaceEmojis($body, array $emojis)
78 foreach ($emojis as $emoji) {
79 $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
80 $body = str_replace($emoji['name'], $replace, $body);
86 * Store attached media files in the post-media table
89 * @param array $attachment
92 private static function storeAttachmentAsMedia(int $uriid, array $attachment)
94 if (empty($attachment['url'])) {
98 $data = ['uri-id' => $uriid];
100 $filetype = strtolower(substr($attachment['mediaType'], 0, strpos($attachment['mediaType'], '/')));
101 if ($filetype == 'image') {
102 $data['type'] = Post\Media::IMAGE;
103 } elseif ($filetype == 'video') {
104 $data['type'] = Post\Media::VIDEO;
105 } elseif ($filetype == 'audio') {
106 $data['type'] = Post\Media::AUDIO;
107 } elseif (in_array($attachment['mediaType'], ['application/x-bittorrent', 'application/x-bittorrent;x-scheme-handler/magnet'])) {
108 $data['type'] = Post\Media::TORRENT;
110 Logger::info('Unknown type', ['attachment' => $attachment]);
114 $data['url'] = $attachment['url'];
115 $data['mimetype'] = $attachment['mediaType'];
116 $data['height'] = $attachment['height'] ?? null;
117 $data['size'] = $attachment['size'] ?? null;
118 $data['preview'] = $attachment['image'] ?? null;
119 $data['description'] = $attachment['name'] ?? null;
121 Post\Media::insert($data);
125 * Add attachment data to the item array
127 * @param array $activity
130 * @return array array
132 private static function constructAttachList($activity, $item)
134 if (empty($activity['attachments'])) {
138 foreach ($activity['attachments'] as $attach) {
139 switch ($attach['type']) {
142 'url' => $attach['url'],
143 'type' => $attach['type'],
144 'title' => $attach['title'] ?? '',
145 'text' => $attach['desc'] ?? '',
146 'image' => $attach['image'] ?? '',
150 $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
153 self::storeAttachmentAsMedia($item['uri-id'], $attach);
155 $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
156 if ($filetype == 'image') {
157 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
161 $item['body'] .= "\n";
163 // image is the preview/thumbnail URL
164 if (!empty($attach['image'])) {
165 $item['body'] .= '[url=' . $attach['url'] . ']';
166 $attach['url'] = $attach['image'];
169 if (empty($attach['name'])) {
170 $item['body'] .= '[img]' . $attach['url'] . '[/img]';
172 $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
175 if (!empty($attach['image'])) {
176 $item['body'] .= '[/url]';
178 } elseif ($filetype == 'audio') {
179 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
183 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
184 } elseif ($filetype == 'video') {
185 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
189 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
200 * @param array $activity Activity array
201 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
203 public static function updateItem($activity)
205 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
206 if (!DBA::isResult($item)) {
207 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
208 $item = self::createItem($activity);
209 self::postItem($activity, $item);
213 $item['changed'] = DateTimeFormat::utcNow();
214 $item['edited'] = DateTimeFormat::utc($activity['updated']);
216 $item = self::processContent($activity, $item);
218 $item = self::constructAttachList($activity, $item);
224 Item::update($item, ['uri' => $activity['id']]);
228 * Prepares data for a message
230 * @param array $activity Activity array
231 * @return array Internal item
232 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
233 * @throws \ImagickException
235 public static function createItem($activity)
238 $item['verb'] = Activity::POST;
239 $item['thr-parent'] = $activity['reply-to-id'];
241 if ($activity['reply-to-id'] == $activity['id']) {
242 $item['gravity'] = GRAVITY_PARENT;
243 $item['object-type'] = Activity\ObjectType::NOTE;
245 $item['gravity'] = GRAVITY_COMMENT;
246 $item['object-type'] = Activity\ObjectType::COMMENT;
249 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
250 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
251 self::fetchMissingActivity($activity['reply-to-id'], $activity);
254 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
256 /// @todo What to do with $activity['context']?
257 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
258 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
262 $item['network'] = Protocol::ACTIVITYPUB;
263 $item['author-link'] = $activity['author'];
264 $item['author-id'] = Contact::getIdForURL($activity['author']);
265 $item['owner-link'] = $activity['actor'];
266 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
268 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
269 $item['private'] = Item::UNLISTED;
270 } elseif (in_array(0, $activity['receiver'])) {
271 $item['private'] = Item::PUBLIC;
273 $item['private'] = Item::PRIVATE;
276 if (!empty($activity['raw'])) {
277 $item['source'] = $activity['raw'];
278 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
279 $item['conversation-href'] = $activity['context'] ?? '';
280 $item['conversation-uri'] = $activity['conversation'] ?? '';
282 if (isset($activity['push'])) {
283 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
287 $item['isForum'] = false;
289 if (!empty($activity['thread-completion'])) {
290 if ($activity['thread-completion'] != $item['owner-id']) {
291 $actor = Contact::getById($activity['thread-completion'], ['url']);
292 $item['causer-link'] = $actor['url'];
293 $item['causer-id'] = $activity['thread-completion'];
294 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
296 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
297 $item['causer-link'] = $item['owner-link'];
298 $item['causer-id'] = $item['owner-id'];
299 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
302 $item['owner-link'] = $item['author-link'];
303 $item['owner-id'] = $item['author-id'];
305 $actor = APContact::getByURL($item['owner-link'], false);
306 $item['isForum'] = ($actor['type'] == 'Group');
309 $item['uri'] = $activity['id'];
311 $item['created'] = DateTimeFormat::utc($activity['published']);
312 $item['edited'] = DateTimeFormat::utc($activity['updated']);
313 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
314 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
316 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
318 $item = self::processContent($activity, $item);
320 Logger::info('Message was not processed');
324 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
326 $item = self::constructAttachList($activity, $item);
334 * @param array $activity
335 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
336 * @throws \ImagickException
338 public static function deleteItem($activity)
340 $owner = Contact::getIdForURL($activity['actor']);
342 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
343 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
347 * Prepare the item array for an activity
349 * @param array $activity Activity array
350 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
351 * @throws \ImagickException
353 public static function addTag($activity)
355 if (empty($activity['object_content']) || empty($activity['object_id'])) {
359 foreach ($activity['receiver'] as $receiver) {
360 $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
361 if (!DBA::isResult($item)) {
362 // We don't fetch missing content for this purpose
366 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
367 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
371 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
372 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
377 * Prepare the item array for an activity
379 * @param array $activity Activity array
380 * @param string $verb Activity verb
381 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
382 * @throws \ImagickException
384 public static function createActivity($activity, $verb)
386 $item = self::createItem($activity);
387 $item['verb'] = $verb;
388 $item['thr-parent'] = $activity['object_id'];
389 $item['gravity'] = GRAVITY_ACTIVITY;
390 $item['object-type'] = Activity\ObjectType::NOTE;
392 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
394 self::postItem($activity, $item);
400 * @param array $activity Activity array
404 public static function createEvent($activity, $item)
406 $event['summary'] = HTML::toBBCode($activity['name']);
407 $event['desc'] = HTML::toBBCode($activity['content']);
408 $event['start'] = $activity['start-time'];
409 $event['finish'] = $activity['end-time'];
410 $event['nofinish'] = empty($event['finish']);
411 $event['location'] = $activity['location'];
412 $event['adjust'] = true;
413 $event['cid'] = $item['contact-id'];
414 $event['uid'] = $item['uid'];
415 $event['uri'] = $item['uri'];
416 $event['edited'] = $item['edited'];
417 $event['private'] = $item['private'];
418 $event['guid'] = $item['guid'];
419 $event['plink'] = $item['plink'];
421 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
422 $ev = DBA::selectFirst('event', ['id'], $condition);
423 if (DBA::isResult($ev)) {
424 $event['id'] = $ev['id'];
427 $event_id = Event::store($event);
428 Logger::info('Event was stored', ['id' => $event_id]);
432 * Process the content
434 * @param array $activity Activity array
436 * @return array|bool Returns the item array or false if there was an unexpected occurrence
439 private static function processContent($activity, $item)
441 $item['title'] = HTML::toBBCode($activity['name']);
443 $content = HTML::toBBCode($activity['content']);
445 if (!empty($activity['emojis'])) {
446 $content = self::replaceEmojis($content, $activity['emojis']);
449 $content = self::convertMentions($content);
451 if (!empty($activity['source'])) {
452 $item['body'] = $activity['source'];
453 $item['raw-body'] = $content;
455 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
456 $item_private = !in_array(0, $activity['item_receiver']);
457 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
458 if (!DBA::isResult($parent)) {
459 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
462 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
463 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
467 $content = self::removeImplicitMentionsFromBody($content, $parent);
469 $item['content-warning'] = HTML::toBBCode($activity['summary']);
470 $item['raw-body'] = $item['body'] = $content;
473 self::storeFromBody($item);
474 self::storeTags($item['uri-id'], $activity['tags']);
476 $item['location'] = $activity['location'];
478 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
479 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
482 $item['app'] = $activity['generator'];
488 * Store hashtags and mentions
492 private static function storeFromBody(array $item)
494 // Make sure to delete all existing tags (can happen when called via the update functionality)
495 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
497 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
501 * Generate a GUID out of an URL
503 * @param string $url message URL
504 * @return string with GUID
506 private static function getGUIDByURL(string $url)
508 $parsed = parse_url($url);
510 $host_hash = hash('crc32', $parsed['host']);
512 unset($parsed["scheme"]);
513 unset($parsed["host"]);
515 $path = implode("/", $parsed);
517 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
521 * Creates an item post
523 * @param array $activity Activity data
524 * @param array $item item array
525 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
526 * @throws \ImagickException
528 public static function postItem(array $activity, array $item)
535 ksort($activity['receiver']);
537 foreach ($activity['receiver'] as $receiver) {
538 if ($receiver == -1) {
542 $item['uid'] = $receiver;
544 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
546 case Receiver::TARGET_TO:
547 $item['post-type'] = Item::PT_TO;
549 case Receiver::TARGET_CC:
550 $item['post-type'] = Item::PT_CC;
552 case Receiver::TARGET_BTO:
553 $item['post-type'] = Item::PT_BTO;
555 case Receiver::TARGET_BCC:
556 $item['post-type'] = Item::PT_BCC;
558 case Receiver::TARGET_FOLLOWER:
559 $item['post-type'] = Item::PT_FOLLOWER;
561 case Receiver::TARGET_ANSWER:
562 $item['post-type'] = Item::PT_COMMENT;
564 case Receiver::TARGET_GLOBAL:
565 $item['post-type'] = Item::PT_GLOBAL;
568 $item['post-type'] = Item::PT_ARTICLE;
571 if (!empty($activity['from-relay'])) {
572 $item['post-type'] = Item::PT_RELAY;
573 } elseif (!empty($activity['thread-completion'])) {
574 $item['post-type'] = Item::PT_FETCHED;
577 if ($item['isForum'] ?? false) {
578 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
580 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
583 if (($receiver != 0) && empty($item['contact-id'])) {
584 $item['contact-id'] = Contact::getIdForURL($activity['author']);
587 if (!empty($activity['directmessage'])) {
588 self::postMail($activity, $item);
592 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
593 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
595 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
596 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
600 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
604 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
607 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
608 self::createEvent($activity, $item);
611 $item_id = Item::insert($item);
613 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
615 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
618 if ($item['uid'] == 0) {
623 // Store send a follow request for every reshare - but only when the item had been stored
624 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
625 $author = APContact::getByURL($item['owner-link'], false);
626 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
627 if ($author['type'] != 'Group') {
628 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
629 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
635 * Store tags and mentions into the tag table
637 * @param integer $uriid
640 private static function storeTags(int $uriid, array $tags = null)
642 foreach ($tags as $tag) {
643 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
647 $hash = substr($tag['name'], 0, 1);
649 if ($tag['type'] == 'Mention') {
650 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
651 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
652 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
653 $tag['name'] = substr($tag['name'], 1);
655 $type = Tag::IMPLICIT_MENTION;
657 if (!empty($tag['href'])) {
658 $apcontact = APContact::getByURL($tag['href']);
659 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
660 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
663 } elseif ($tag['type'] == 'Hashtag') {
664 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
665 $tag['name'] = substr($tag['name'], 1);
667 $type = Tag::HASHTAG;
670 if (empty($tag['name'])) {
674 Tag::store($uriid, $type, $tag['name'], $tag['href']);
679 * Creates an mail post
681 * @param array $activity Activity data
682 * @param array $item item array
683 * @return int|bool New mail table row id or false on error
684 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
686 private static function postMail($activity, $item)
688 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
689 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
693 Logger::info('Direct Message', $item);
696 $msg['uid'] = $item['uid'];
698 $msg['contact-id'] = $item['contact-id'];
700 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
701 $msg['from-name'] = $contact['name'];
702 $msg['from-url'] = $contact['url'];
703 $msg['from-photo'] = $contact['photo'];
705 $msg['uri'] = $item['uri'];
706 $msg['created'] = $item['created'];
708 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
709 if (DBA::isResult($parent)) {
710 $msg['parent-uri'] = $parent['parent-uri'];
711 $msg['title'] = $parent['title'];
713 $msg['parent-uri'] = $item['thr-parent'];
715 if (!empty($item['title'])) {
716 $msg['title'] = $item['title'];
717 } elseif (!empty($item['content-warning'])) {
718 $msg['title'] = $item['content-warning'];
720 // Trying to generate a title out of the body
721 $title = $item['body'];
723 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
724 $title = $matches[3];
727 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
729 if (strlen($title) > 20) {
730 $title = substr($title, 0, 20) . '...';
733 $msg['title'] = $title;
736 $msg['body'] = $item['body'];
738 return Mail::insert($msg);
742 * Fetches missing posts
744 * @param string $url message URL
745 * @param array $child activity array with the child of this message
746 * @param string $relay_actor Relay actor
747 * @return string fetched message URL
748 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
750 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
752 if (!empty($child['receiver'])) {
753 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
758 $object = ActivityPub::fetchContent($url, $uid);
759 if (empty($object)) {
760 Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
764 if (empty($object['id'])) {
765 Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
769 if (!empty($object['actor'])) {
770 $object_actor = $object['actor'];
771 } elseif (!empty($object['attributedTo'])) {
772 $object_actor = $object['attributedTo'];
773 if (is_array($object_actor)) {
774 $compacted = JsonLD::compact($object);
775 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
782 $signer = [$object_actor];
784 if (!empty($child['author'])) {
785 $actor = $child['author'];
788 $actor = $object_actor;
791 if (!empty($object['published'])) {
792 $published = $object['published'];
793 } elseif (!empty($child['published'])) {
794 $published = $child['published'];
796 $published = DateTimeFormat::utcNow();
800 $activity['@context'] = $object['@context'];
801 unset($object['@context']);
802 $activity['id'] = $object['id'];
803 $activity['to'] = $object['to'] ?? [];
804 $activity['cc'] = $object['cc'] ?? [];
805 $activity['actor'] = $actor;
806 $activity['object'] = $object;
807 $activity['published'] = $published;
808 $activity['type'] = 'Create';
810 $ldactivity = JsonLD::compact($activity);
812 if (!empty($relay_actor)) {
813 $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
814 } elseif (!empty($child['thread-completion'])) {
815 $ldactivity['thread-completion'] = $child['thread-completion'];
817 $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
820 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
824 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
826 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
828 return $activity['id'];
832 * Test if incoming relay messages should be accepted
834 * @param array $activity activity array
835 * @param string $id object ID
836 * @return boolean true if message is accepted
838 private static function acceptIncomingMessage(array $activity, string $id)
840 if (empty($activity['as:object'])) {
841 Logger::info('No object field in activity - accepted', ['id' => $id]);
845 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
846 if (Item::exists(['uri' => $replyto])) {
847 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
851 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
852 $authorid = Contact::getIdForURL($attributed_to);
854 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
857 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
859 foreach ($tags as $tag) {
860 if ($tag['type'] != 'Hashtag') {
863 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
867 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
871 * perform a "follow" request
873 * @param array $activity
874 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
875 * @throws \ImagickException
877 public static function followUser($activity)
879 $uid = User::getIdForURL($activity['object_id']);
884 $owner = User::getOwnerDataById($uid);
889 $cid = Contact::getIdForURL($activity['actor'], $uid);
891 self::switchContact($cid);
892 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
893 $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
898 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
899 'author-link' => $activity['actor']];
901 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
903 // Ensure that the contact has got the right network type
904 self::switchContact($item['author-id']);
906 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
907 if ($result === true) {
908 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
911 $cid = Contact::getIdForURL($activity['actor'], $uid);
916 if (empty($contact)) {
917 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
920 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
924 * Update the given profile
926 * @param array $activity
929 public static function updatePerson($activity)
931 if (empty($activity['object_id'])) {
935 Logger::info('Updating profile', ['object' => $activity['object_id']]);
936 Contact::updateFromProbeByURL($activity['object_id']);
940 * Delete the given profile
942 * @param array $activity
943 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
945 public static function deletePerson($activity)
947 if (empty($activity['object_id']) || empty($activity['actor'])) {
948 Logger::info('Empty object id or actor.');
952 if ($activity['object_id'] != $activity['actor']) {
953 Logger::info('Object id does not match actor.');
957 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
958 while ($contact = DBA::fetch($contacts)) {
959 Contact::remove($contact['id']);
961 DBA::close($contacts);
963 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
967 * Accept a follow request
969 * @param array $activity
970 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
971 * @throws \ImagickException
973 public static function acceptFollowUser($activity)
975 $uid = User::getIdForURL($activity['object_actor']);
980 $cid = Contact::getIdForURL($activity['actor'], $uid);
982 Logger::info('No contact found', ['actor' => $activity['actor']]);
986 self::switchContact($cid);
988 $fields = ['pending' => false];
990 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
991 if ($contact['rel'] == Contact::FOLLOWER) {
992 $fields['rel'] = Contact::FRIEND;
995 $condition = ['id' => $cid];
996 DBA::update('contact', $fields, $condition);
997 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1001 * Reject a follow request
1003 * @param array $activity
1004 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1005 * @throws \ImagickException
1007 public static function rejectFollowUser($activity)
1009 $uid = User::getIdForURL($activity['object_actor']);
1014 $cid = Contact::getIdForURL($activity['actor'], $uid);
1016 Logger::info('No contact found', ['actor' => $activity['actor']]);
1020 self::switchContact($cid);
1022 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1023 Contact::remove($cid);
1024 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1026 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1031 * Undo activity like "like" or "dislike"
1033 * @param array $activity
1034 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1035 * @throws \ImagickException
1037 public static function undoActivity($activity)
1039 if (empty($activity['object_id'])) {
1043 if (empty($activity['object_actor'])) {
1047 $author_id = Contact::getIdForURL($activity['object_actor']);
1048 if (empty($author_id)) {
1052 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1056 * Activity to remove a follower
1058 * @param array $activity
1059 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1060 * @throws \ImagickException
1062 public static function undoFollowUser($activity)
1064 $uid = User::getIdForURL($activity['object_object']);
1069 $owner = User::getOwnerDataById($uid);
1070 if (empty($owner)) {
1074 $cid = Contact::getIdForURL($activity['actor'], $uid);
1076 Logger::info('No contact found', ['actor' => $activity['actor']]);
1080 self::switchContact($cid);
1082 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1083 if (!DBA::isResult($contact)) {
1087 Contact::removeFollower($owner, $contact);
1088 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1092 * Switches a contact to AP if needed
1094 * @param integer $cid Contact ID
1095 * @throws \Exception
1097 private static function switchContact($cid)
1099 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1100 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1104 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1105 Contact::updateFromProbe($cid);
1109 * Collects implicit mentions like:
1110 * - the author of the parent item
1111 * - all the mentioned conversants in the parent item
1113 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1115 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1117 private static function getImplicitMentionList(array $parent)
1119 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1121 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1123 $implicit_mentions = [];
1124 if (empty($parent_author['url'])) {
1125 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1127 $implicit_mentions[] = $parent_author['url'];
1128 $implicit_mentions[] = $parent_author['nurl'];
1129 $implicit_mentions[] = $parent_author['alias'];
1132 if (!empty($parent['alias'])) {
1133 $implicit_mentions[] = $parent['alias'];
1136 foreach ($parent_terms as $term) {
1137 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1138 if (!empty($contact['url'])) {
1139 $implicit_mentions[] = $contact['url'];
1140 $implicit_mentions[] = $contact['nurl'];
1141 $implicit_mentions[] = $contact['alias'];
1145 return $implicit_mentions;
1149 * Strips from the body prepended implicit mentions
1151 * @param string $body
1152 * @param array $parent
1155 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1157 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1161 $potential_mentions = self::getImplicitMentionList($parent);
1163 $kept_mentions = [];
1165 // Extract one prepended mention at a time from the body
1166 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1167 if (!in_array($matches[2], $potential_mentions)) {
1168 $kept_mentions[] = $matches[1];
1171 $body = $matches[3];
1174 // Re-appending the kept mentions to the body after extraction
1175 $kept_mentions[] = $body;
1177 return implode('', $kept_mentions);