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\Protocol\Activity;
41 use Friendica\Protocol\ActivityPub;
42 use Friendica\Util\DateTimeFormat;
43 use Friendica\Util\JsonLD;
44 use Friendica\Util\Strings;
47 * ActivityPub Processor Protocol class
52 * Converts mentions from Pleroma into the Friendica format
56 * @return string converted body
58 private static function convertMentions($body)
60 $URLSearchString = "^\[\]";
61 $body = preg_replace("/\[url\=([$URLSearchString]*)\]([#@!])(.*?)\[\/url\]/ism", '$2[url=$1]$3[/url]', $body);
67 * Replaces emojis in the body
69 * @param array $emojis
72 * @return string with replaced emojis
74 private static function replaceEmojis($body, array $emojis)
76 foreach ($emojis as $emoji) {
77 $replace = '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
78 $body = str_replace($emoji['name'], $replace, $body);
84 * Add attachment data to the item array
86 * @param array $activity
91 private static function constructAttachList($activity, $item)
93 if (empty($activity['attachments'])) {
97 foreach ($activity['attachments'] as $attach) {
98 switch ($attach['type']) {
101 'url' => $attach['url'],
102 'type' => $attach['type'],
103 'title' => $attach['title'] ?? '',
104 'text' => $attach['desc'] ?? '',
105 'image' => $attach['image'] ?? '',
109 $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
112 $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
113 if ($filetype == 'image') {
114 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
118 if (empty($attach['name'])) {
119 $item['body'] .= "\n[img]" . $attach['url'] . '[/img]';
121 $item['body'] .= "\n[img=" . $attach['url'] . ']' . $attach['name'] . '[/img]';
123 } elseif ($filetype == 'audio') {
124 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
128 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
129 } elseif ($filetype == 'video') {
130 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
134 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
136 if (!empty($item["attach"])) {
137 $item["attach"] .= ',';
139 $item["attach"] = '';
142 $item["attach"] .= '[attach]href="' . $attach['url'] . '" length="' . ($attach['length'] ?? '0') . '" type="' . $attach['mediaType'] . '" title="' . ($attach['name'] ?? '') . '"[/attach]';
153 * @param array $activity Activity array
154 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
156 public static function updateItem($activity)
158 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
159 if (!DBA::isResult($item)) {
160 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
161 self::createItem($activity);
165 $item['changed'] = DateTimeFormat::utcNow();
166 $item['edited'] = DateTimeFormat::utc($activity['updated']);
168 $item = self::processContent($activity, $item);
173 Item::update($item, ['uri' => $activity['id']]);
177 * Prepares data for a message
179 * @param array $activity Activity array
180 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
181 * @throws \ImagickException
183 public static function createItem($activity)
186 $item['verb'] = Activity::POST;
187 $item['thr-parent'] = $activity['reply-to-id'];
189 if ($activity['reply-to-id'] == $activity['id']) {
190 $item['gravity'] = GRAVITY_PARENT;
191 $item['object-type'] = Activity\ObjectType::NOTE;
193 $item['gravity'] = GRAVITY_COMMENT;
194 $item['object-type'] = Activity\ObjectType::COMMENT;
196 // Ensure that the comment reaches all receivers of the referring post
197 $activity['receiver'] = self::addReceivers($activity);
200 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
201 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
202 self::fetchMissingActivity($activity['reply-to-id'], $activity);
205 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
207 self::postItem($activity, $item);
213 * @param array $activity
214 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
215 * @throws \ImagickException
217 public static function deleteItem($activity)
219 $owner = Contact::getIdForURL($activity['actor']);
221 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
222 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
226 * Prepare the item array for an activity
228 * @param array $activity Activity array
229 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
230 * @throws \ImagickException
232 public static function addTag($activity)
234 if (empty($activity['object_content']) || empty($activity['object_id'])) {
238 foreach ($activity['receiver'] as $receiver) {
239 $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
240 if (!DBA::isResult($item)) {
241 // We don't fetch missing content for this purpose
245 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
246 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
250 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
251 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
256 * Add users to the receiver list of the given public activity.
257 * This is used to ensure that the activity will be stored in every thread.
259 * @param array $activity Activity array
260 * @return array Modified receiver list
262 private static function addReceivers(array $activity)
264 if (!in_array(0, $activity['receiver'])) {
265 // Private activities will not be modified
266 return $activity['receiver'];
269 // Add all owners of the referring item to the receivers
270 $original = $receivers = $activity['receiver'];
271 $items = Item::select(['uid'], ['uri' => $activity['object_id']]);
272 while ($item = DBA::fetch($items)) {
273 $receivers['uid:' . $item['uid']] = $item['uid'];
277 if (count($original) != count($receivers)) {
278 Logger::info('Improved data', ['id' => $activity['id'], 'object' => $activity['object_id'], 'original' => $original, 'improved' => $receivers]);
285 * Prepare the item array for an activity
287 * @param array $activity Activity array
288 * @param string $verb Activity verb
289 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
290 * @throws \ImagickException
292 public static function createActivity($activity, $verb)
295 $item['verb'] = $verb;
296 $item['thr-parent'] = $activity['object_id'];
297 $item['gravity'] = GRAVITY_ACTIVITY;
298 $item['object-type'] = Activity\ObjectType::NOTE;
300 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
302 $activity['receiver'] = self::addReceivers($activity);
304 self::postItem($activity, $item);
310 * @param array $activity Activity array
314 public static function createEvent($activity, $item)
316 $event['summary'] = HTML::toBBCode($activity['name']);
317 $event['desc'] = HTML::toBBCode($activity['content']);
318 $event['start'] = $activity['start-time'];
319 $event['finish'] = $activity['end-time'];
320 $event['nofinish'] = empty($event['finish']);
321 $event['location'] = $activity['location'];
322 $event['adjust'] = true;
323 $event['cid'] = $item['contact-id'];
324 $event['uid'] = $item['uid'];
325 $event['uri'] = $item['uri'];
326 $event['edited'] = $item['edited'];
327 $event['private'] = $item['private'];
328 $event['guid'] = $item['guid'];
329 $event['plink'] = $item['plink'];
331 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
332 $ev = DBA::selectFirst('event', ['id'], $condition);
333 if (DBA::isResult($ev)) {
334 $event['id'] = $ev['id'];
337 $event_id = Event::store($event);
338 Logger::info('Event was stored', ['id' => $event_id]);
342 * Process the content
344 * @param array $activity Activity array
346 * @return array|bool Returns the item array or false if there was an unexpected occurrence
349 private static function processContent($activity, $item)
351 $item['title'] = HTML::toBBCode($activity['name']);
353 if (!empty($activity['source'])) {
354 $item['body'] = $activity['source'];
356 $content = HTML::toBBCode($activity['content']);
358 if (!empty($activity['emojis'])) {
359 $content = self::replaceEmojis($content, $activity['emojis']);
362 $content = self::convertMentions($content);
364 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
365 $item_private = !in_array(0, $activity['item_receiver']);
366 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
367 if (!DBA::isResult($parent)) {
368 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
371 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
372 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
376 $content = self::removeImplicitMentionsFromBody($content, $parent);
378 $item['content-warning'] = HTML::toBBCode($activity['summary']);
379 $item['body'] = $content;
382 self::storeFromBody($item);
383 self::storeTags($item['uri-id'], $activity['tags']);
385 $item['location'] = $activity['location'];
387 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
388 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
391 $item['app'] = $activity['generator'];
397 * Store hashtags and mentions
401 private static function storeFromBody(array $item)
403 // Make sure to delete all existing tags (can happen when called via the update functionality)
404 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
406 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
410 * Generate a GUID out of an URL
412 * @param string $url message URL
413 * @return string with GUID
415 private static function getGUIDByURL(string $url)
417 $parsed = parse_url($url);
419 $host_hash = hash('crc32', $parsed['host']);
421 unset($parsed["scheme"]);
422 unset($parsed["host"]);
424 $path = implode("/", $parsed);
426 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
430 * Creates an item post
432 * @param array $activity Activity data
433 * @param array $item item array
434 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
435 * @throws \ImagickException
437 private static function postItem($activity, $item)
439 /// @todo What to do with $activity['context']?
440 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
441 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
445 $item['network'] = Protocol::ACTIVITYPUB;
446 $item['author-link'] = $activity['author'];
447 $item['author-id'] = Contact::getIdForURL($activity['author'], 0, false);
448 $item['owner-link'] = $activity['actor'];
449 $item['owner-id'] = Contact::getIdForURL($activity['actor'], 0, false);
451 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
452 $item['private'] = Item::UNLISTED;
453 } elseif (in_array(0, $activity['receiver'])) {
454 $item['private'] = Item::PUBLIC;
456 $item['private'] = Item::PRIVATE;
459 if (!empty($activity['raw'])) {
460 $item['source'] = $activity['raw'];
461 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
462 $item['conversation-href'] = $activity['context'] ?? '';
463 $item['conversation-uri'] = $activity['conversation'] ?? '';
465 if (isset($activity['push'])) {
466 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
472 if (!empty($activity['thread-completion'])) {
473 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
474 $item['causer-link'] = $item['owner-link'];
475 $item['causer-id'] = $item['owner-id'];
477 Logger::info('Ignoring actor because of thread completion.', ['actor' => $item['owner-link']]);
478 $item['owner-link'] = $item['author-link'];
479 $item['owner-id'] = $item['author-id'];
481 $actor = APContact::getByURL($item['owner-link'], false);
482 $isForum = ($actor['type'] == 'Group');
485 $item['uri'] = $activity['id'];
487 $item['created'] = DateTimeFormat::utc($activity['published']);
488 $item['edited'] = DateTimeFormat::utc($activity['updated']);
489 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
490 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
492 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
494 $item = self::processContent($activity, $item);
499 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
501 $item = self::constructAttachList($activity, $item);
505 foreach ($activity['receiver'] as $receiver) {
506 if ($receiver == -1) {
510 $item['uid'] = $receiver;
513 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver, false);
515 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver, false);
518 if (($receiver != 0) && empty($item['contact-id'])) {
519 $item['contact-id'] = Contact::getIdForURL($activity['author'], 0, false);
522 if (!empty($activity['directmessage'])) {
523 self::postMail($activity, $item);
527 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
528 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
530 if ($skip && (($activity['type'] == 'as:Announce') || $isForum)) {
531 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
535 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
539 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
542 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
543 self::createEvent($activity, $item);
546 $item_id = Item::insert($item);
548 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
550 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
553 if ($item['uid'] == 0) {
558 // Store send a follow request for every reshare - but only when the item had been stored
559 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
560 $author = APContact::getByURL($item['owner-link'], false);
561 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
562 if ($author['type'] != 'Group') {
563 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
564 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
570 * Store tags and mentions into the tag table
572 * @param integer $uriid
575 private static function storeTags(int $uriid, array $tags = null)
577 foreach ($tags as $tag) {
578 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
582 $hash = substr($tag['name'], 0, 1);
584 if ($tag['type'] == 'Mention') {
585 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
586 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
587 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
588 $tag['name'] = substr($tag['name'], 1);
590 $type = Tag::IMPLICIT_MENTION;
592 if (!empty($tag['href'])) {
593 $apcontact = APContact::getByURL($tag['href']);
594 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
595 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
598 } elseif ($tag['type'] == 'Hashtag') {
599 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
600 $tag['name'] = substr($tag['name'], 1);
602 $type = Tag::HASHTAG;
605 if (empty($tag['name'])) {
609 Tag::store($uriid, $type, $tag['name'], $tag['href']);
614 * Creates an mail post
616 * @param array $activity Activity data
617 * @param array $item item array
618 * @return int|bool New mail table row id or false on error
619 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
621 private static function postMail($activity, $item)
623 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
624 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
628 Logger::info('Direct Message', $item);
631 $msg['uid'] = $item['uid'];
633 $msg['contact-id'] = $item['contact-id'];
635 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
636 $msg['from-name'] = $contact['name'];
637 $msg['from-url'] = $contact['url'];
638 $msg['from-photo'] = $contact['photo'];
640 $msg['uri'] = $item['uri'];
641 $msg['created'] = $item['created'];
643 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
644 if (DBA::isResult($parent)) {
645 $msg['parent-uri'] = $parent['parent-uri'];
646 $msg['title'] = $parent['title'];
648 $msg['parent-uri'] = $item['thr-parent'];
650 if (!empty($item['title'])) {
651 $msg['title'] = $item['title'];
652 } elseif (!empty($item['content-warning'])) {
653 $msg['title'] = $item['content-warning'];
655 // Trying to generate a title out of the body
656 $title = $item['body'];
658 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
659 $title = $matches[3];
662 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
664 if (strlen($title) > 20) {
665 $title = substr($title, 0, 20) . '...';
668 $msg['title'] = $title;
671 $msg['body'] = $item['body'];
673 return Mail::insert($msg);
677 * Fetches missing posts
679 * @param string $url message URL
680 * @param array $child activity array with the child of this message
681 * @return string fetched message URL
682 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
684 public static function fetchMissingActivity(string $url, array $child = [])
686 if (!empty($child['receiver'])) {
687 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
692 $object = ActivityPub::fetchContent($url, $uid);
693 if (empty($object)) {
694 Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
698 if (empty($object['id'])) {
699 Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
703 if (!empty($child['author'])) {
704 $actor = $child['author'];
705 } elseif (!empty($object['actor'])) {
706 $actor = $object['actor'];
707 } elseif (!empty($object['attributedTo'])) {
708 $actor = $object['attributedTo'];
714 if (!empty($object['published'])) {
715 $published = $object['published'];
716 } elseif (!empty($child['published'])) {
717 $published = $child['published'];
719 $published = DateTimeFormat::utcNow();
723 $activity['@context'] = $object['@context'];
724 unset($object['@context']);
725 $activity['id'] = $object['id'];
726 $activity['to'] = $object['to'] ?? [];
727 $activity['cc'] = $object['cc'] ?? [];
728 $activity['actor'] = $actor;
729 $activity['object'] = $object;
730 $activity['published'] = $published;
731 $activity['type'] = 'Create';
733 $ldactivity = JsonLD::compact($activity);
735 $ldactivity['thread-completion'] = true;
737 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity));
739 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
741 return $activity['id'];
745 * perform a "follow" request
747 * @param array $activity
748 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
749 * @throws \ImagickException
751 public static function followUser($activity)
753 $uid = User::getIdForURL($activity['object_id']);
758 $owner = User::getOwnerDataById($uid);
760 $cid = Contact::getIdForURL($activity['actor'], $uid);
762 self::switchContact($cid);
763 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
764 $contact = DBA::selectFirst('contact', [], ['id' => $cid, 'network' => Protocol::NATIVE_SUPPORT]);
769 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
770 'author-link' => $activity['actor']];
772 $note = Strings::escapeTags(trim($activity['content'] ?? ''));
774 // Ensure that the contact has got the right network type
775 self::switchContact($item['author-id']);
777 $result = Contact::addRelationship($owner, $contact, $item, false, $note);
778 if ($result === true) {
779 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
782 $cid = Contact::getIdForURL($activity['actor'], $uid);
787 if (empty($contact)) {
788 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
791 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
795 * Update the given profile
797 * @param array $activity
800 public static function updatePerson($activity)
802 if (empty($activity['object_id'])) {
806 Logger::info('Updating profile', ['object' => $activity['object_id']]);
807 Contact::updateFromProbeByURL($activity['object_id'], true);
811 * Delete the given profile
813 * @param array $activity
814 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
816 public static function deletePerson($activity)
818 if (empty($activity['object_id']) || empty($activity['actor'])) {
819 Logger::info('Empty object id or actor.');
823 if ($activity['object_id'] != $activity['actor']) {
824 Logger::info('Object id does not match actor.');
828 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
829 while ($contact = DBA::fetch($contacts)) {
830 Contact::remove($contact['id']);
832 DBA::close($contacts);
834 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
838 * Accept a follow request
840 * @param array $activity
841 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
842 * @throws \ImagickException
844 public static function acceptFollowUser($activity)
846 $uid = User::getIdForURL($activity['object_actor']);
851 $cid = Contact::getIdForURL($activity['actor'], $uid);
853 Logger::info('No contact found', ['actor' => $activity['actor']]);
857 self::switchContact($cid);
859 $fields = ['pending' => false];
861 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
862 if ($contact['rel'] == Contact::FOLLOWER) {
863 $fields['rel'] = Contact::FRIEND;
866 $condition = ['id' => $cid];
867 DBA::update('contact', $fields, $condition);
868 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
872 * Reject a follow request
874 * @param array $activity
875 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
876 * @throws \ImagickException
878 public static function rejectFollowUser($activity)
880 $uid = User::getIdForURL($activity['object_actor']);
885 $cid = Contact::getIdForURL($activity['actor'], $uid);
887 Logger::info('No contact found', ['actor' => $activity['actor']]);
891 self::switchContact($cid);
893 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
894 Contact::remove($cid);
895 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
897 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
902 * Undo activity like "like" or "dislike"
904 * @param array $activity
905 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
906 * @throws \ImagickException
908 public static function undoActivity($activity)
910 if (empty($activity['object_id'])) {
914 if (empty($activity['object_actor'])) {
918 $author_id = Contact::getIdForURL($activity['object_actor']);
919 if (empty($author_id)) {
923 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
927 * Activity to remove a follower
929 * @param array $activity
930 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
931 * @throws \ImagickException
933 public static function undoFollowUser($activity)
935 $uid = User::getIdForURL($activity['object_object']);
940 $owner = User::getOwnerDataById($uid);
942 $cid = Contact::getIdForURL($activity['actor'], $uid);
944 Logger::info('No contact found', ['actor' => $activity['actor']]);
948 self::switchContact($cid);
950 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
951 if (!DBA::isResult($contact)) {
955 Contact::removeFollower($owner, $contact);
956 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
960 * Switches a contact to AP if needed
962 * @param integer $cid Contact ID
965 private static function switchContact($cid)
967 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
968 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
972 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
973 Contact::updateFromProbe($cid);
977 * Collects implicit mentions like:
978 * - the author of the parent item
979 * - all the mentioned conversants in the parent item
981 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
983 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
985 private static function getImplicitMentionList(array $parent)
987 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
989 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
991 $implicit_mentions = [];
992 if (empty($parent_author['url'])) {
993 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
995 $implicit_mentions[] = $parent_author['url'];
996 $implicit_mentions[] = $parent_author['nurl'];
997 $implicit_mentions[] = $parent_author['alias'];
1000 if (!empty($parent['alias'])) {
1001 $implicit_mentions[] = $parent['alias'];
1004 foreach ($parent_terms as $term) {
1005 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1006 if (!empty($contact['url'])) {
1007 $implicit_mentions[] = $contact['url'];
1008 $implicit_mentions[] = $contact['nurl'];
1009 $implicit_mentions[] = $contact['alias'];
1013 return $implicit_mentions;
1017 * Strips from the body prepended implicit mentions
1019 * @param string $body
1020 * @param array $parent
1023 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1025 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1029 $potential_mentions = self::getImplicitMentionList($parent);
1031 $kept_mentions = [];
1033 // Extract one prepended mention at a time from the body
1034 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1035 if (!in_array($matches[2], $potential_mentions)) {
1036 $kept_mentions[] = $matches[1];
1039 $body = $matches[3];
1042 // Re-appending the kept mentions to the body after extraction
1043 $kept_mentions[] = $body;
1045 return implode('', $kept_mentions);