3 * @copyright Copyright (C) 2010-2021, 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\Content\Text\HTML;
26 use Friendica\Content\Text\Markdown;
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\GServer;
36 use Friendica\Model\Item;
37 use Friendica\Model\ItemURI;
38 use Friendica\Model\Mail;
39 use Friendica\Model\Tag;
40 use Friendica\Model\User;
41 use Friendica\Model\Post;
42 use Friendica\Protocol\Activity;
43 use Friendica\Protocol\ActivityPub;
44 use Friendica\Protocol\Relay;
45 use Friendica\Util\DateTimeFormat;
46 use Friendica\Util\JsonLD;
47 use Friendica\Util\Strings;
50 * ActivityPub Processor Protocol class
55 * Extracts the tag character (#, @, !) from mention links
60 protected static function normalizeMentionLinks(string $body): string
62 return preg_replace('%\[url=([^\[\]]*)]([#@!])(.*?)\[/url]%ism', '$2[url=$1]$3[/url]', $body);
66 * Convert the language array into a language JSON
68 * @param array $languages
69 * @return string language JSON
71 private static function processLanguages(array $languages)
73 $codes = array_keys($languages);
75 foreach ($codes as $code) {
83 return json_encode($lang);
86 * Replaces emojis in the body
88 * @param array $emojis
91 * @return string with replaced emojis
93 private static function replaceEmojis($body, array $emojis)
97 array_column($emojis, 'name'),
98 array_map(function ($emoji) {
99 return '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
108 * Store attached media files in the post-media table
111 * @param array $attachment
114 private static function storeAttachmentAsMedia(int $uriid, array $attachment)
116 if (empty($attachment['url'])) {
120 $data = ['uri-id' => $uriid];
121 $data['type'] = Post\Media::UNKNOWN;
122 $data['url'] = $attachment['url'];
123 $data['mimetype'] = $attachment['mediaType'];
124 $data['height'] = $attachment['height'] ?? null;
125 $data['width'] = $attachment['width'] ?? null;
126 $data['size'] = $attachment['size'] ?? null;
127 $data['preview'] = $attachment['image'] ?? null;
128 $data['description'] = $attachment['name'] ?? null;
130 Post\Media::insert($data);
134 * Stire attachment data
136 * @param array $activity
139 private static function storeAttachments($activity, $item)
141 if (empty($activity['attachments'])) {
145 foreach ($activity['attachments'] as $attach) {
146 self::storeAttachmentAsMedia($item['uri-id'], $attach);
153 * @param array $activity Activity array
154 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
156 public static function updateItem($activity)
158 $item = Post::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity', 'post-type'], ['uri' => $activity['id']]);
159 if (!DBA::isResult($item)) {
160 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
161 $item = self::createItem($activity);
162 self::postItem($activity, $item);
166 $item['changed'] = DateTimeFormat::utcNow();
167 $item['edited'] = DateTimeFormat::utc($activity['updated']);
169 $item = self::processContent($activity, $item);
171 self::storeAttachments($activity, $item);
177 Item::update($item, ['uri' => $activity['id']]);
181 * Prepares data for a message
183 * @param array $activity Activity array
184 * @return array Internal item
185 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
186 * @throws \ImagickException
188 public static function createItem($activity)
191 $item['verb'] = Activity::POST;
192 $item['thr-parent'] = $activity['reply-to-id'];
194 if ($activity['reply-to-id'] == $activity['id']) {
195 $item['gravity'] = GRAVITY_PARENT;
196 $item['object-type'] = Activity\ObjectType::NOTE;
198 $item['gravity'] = GRAVITY_COMMENT;
199 $item['object-type'] = Activity\ObjectType::COMMENT;
202 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Post::exists(['uri' => $activity['reply-to-id']])) {
203 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
204 self::fetchMissingActivity($activity['reply-to-id'], $activity);
207 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
209 /// @todo What to do with $activity['context']?
210 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Post::exists(['uri' => $item['thr-parent']])) {
211 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
215 $item['network'] = Protocol::ACTIVITYPUB;
216 $item['author-link'] = $activity['author'];
217 $item['author-id'] = Contact::getIdForURL($activity['author']);
218 $item['owner-link'] = $activity['actor'];
219 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
221 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
222 $item['private'] = Item::UNLISTED;
223 } elseif (in_array(0, $activity['receiver'])) {
224 $item['private'] = Item::PUBLIC;
226 $item['private'] = Item::PRIVATE;
229 if (!empty($activity['raw'])) {
230 $item['source'] = $activity['raw'];
231 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
232 $item['conversation-href'] = $activity['context'] ?? '';
233 $item['conversation-uri'] = $activity['conversation'] ?? '';
235 if (isset($activity['push'])) {
236 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
240 if (!empty($activity['from-relay'])) {
241 $item['direction'] = Conversation::RELAY;
244 if ($activity['object_type'] == 'as:Article') {
245 $item['post-type'] = Item::PT_ARTICLE;
246 } elseif ($activity['object_type'] == 'as:Audio') {
247 $item['post-type'] = Item::PT_AUDIO;
248 } elseif ($activity['object_type'] == 'as:Document') {
249 $item['post-type'] = Item::PT_DOCUMENT;
250 } elseif ($activity['object_type'] == 'as:Event') {
251 $item['post-type'] = Item::PT_EVENT;
252 } elseif ($activity['object_type'] == 'as:Image') {
253 $item['post-type'] = Item::PT_IMAGE;
254 } elseif ($activity['object_type'] == 'as:Page') {
255 $item['post-type'] = Item::PT_PAGE;
256 } elseif ($activity['object_type'] == 'as:Video') {
257 $item['post-type'] = Item::PT_VIDEO;
259 $item['post-type'] = Item::PT_NOTE;
262 $item['isForum'] = false;
264 if (!empty($activity['thread-completion'])) {
265 if ($activity['thread-completion'] != $item['owner-id']) {
266 $actor = Contact::getById($activity['thread-completion'], ['url']);
267 $item['causer-link'] = $actor['url'];
268 $item['causer-id'] = $activity['thread-completion'];
269 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
271 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
272 $item['causer-link'] = $item['owner-link'];
273 $item['causer-id'] = $item['owner-id'];
274 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
277 $item['owner-link'] = $item['author-link'];
278 $item['owner-id'] = $item['author-id'];
280 $actor = APContact::getByURL($item['owner-link'], false);
281 $item['isForum'] = ($actor['type'] == 'Group');
284 $item['uri'] = $activity['id'];
286 $item['created'] = DateTimeFormat::utc($activity['published']);
287 $item['edited'] = DateTimeFormat::utc($activity['updated']);
288 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
289 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
291 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
292 if (empty($item['uri-id'])) {
293 Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
297 $item = self::processContent($activity, $item);
299 Logger::info('Message was not processed');
303 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
305 self::storeAttachments($activity, $item);
307 // We received the post via AP, so we set the protocol of the server to AP
308 $contact = Contact::getById($item['author-id'], ['gsid']);
309 if (!empty($contact['gsid'])) {
310 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
313 if ($item['author-id'] != $item['owner-id']) {
314 $contact = Contact::getById($item['owner-id'], ['gsid']);
315 if (!empty($contact['gsid'])) {
316 GServer::setProtocol($contact['gsid'], Post\DeliveryData::ACTIVITYPUB);
326 * @param array $activity
327 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
328 * @throws \ImagickException
330 public static function deleteItem($activity)
332 $owner = Contact::getIdForURL($activity['actor']);
334 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
335 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
339 * Prepare the item array for an activity
341 * @param array $activity Activity array
342 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
343 * @throws \ImagickException
345 public static function addTag($activity)
347 if (empty($activity['object_content']) || empty($activity['object_id'])) {
351 foreach ($activity['receiver'] as $receiver) {
352 $item = Post::selectFirst(['id', 'uri-id', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
353 if (!DBA::isResult($item)) {
354 // We don't fetch missing content for this purpose
358 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
359 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
363 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
364 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
369 * Prepare the item array for an activity
371 * @param array $activity Activity array
372 * @param string $verb Activity verb
373 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
374 * @throws \ImagickException
376 public static function createActivity($activity, $verb)
378 $item = self::createItem($activity);
379 $item['verb'] = $verb;
380 $item['thr-parent'] = $activity['object_id'];
381 $item['gravity'] = GRAVITY_ACTIVITY;
382 unset($item['post-type']);
383 $item['object-type'] = Activity\ObjectType::NOTE;
385 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
387 self::postItem($activity, $item);
393 * @param array $activity Activity array
396 * @return int event id
399 public static function createEvent($activity, $item)
401 $event['summary'] = HTML::toBBCode($activity['name']);
402 $event['desc'] = HTML::toBBCode($activity['content']);
403 $event['start'] = $activity['start-time'];
404 $event['finish'] = $activity['end-time'];
405 $event['nofinish'] = empty($event['finish']);
406 $event['location'] = $activity['location'];
407 $event['adjust'] = $activity['adjust'] ?? true;
408 $event['cid'] = $item['contact-id'];
409 $event['uid'] = $item['uid'];
410 $event['uri'] = $item['uri'];
411 $event['edited'] = $item['edited'];
412 $event['private'] = $item['private'];
413 $event['guid'] = $item['guid'];
414 $event['plink'] = $item['plink'];
415 $event['network'] = $item['network'];
416 $event['protocol'] = $item['protocol'];
417 $event['direction'] = $item['direction'];
418 $event['source'] = $item['source'];
420 $ev = DBA::selectFirst('event', ['id'], ['uri' => $item['uri'], 'uid' => $item['uid']]);
421 if (DBA::isResult($ev)) {
422 $event['id'] = $ev['id'];
425 $event_id = Event::store($event);
427 Logger::info('Event was stored', ['id' => $event_id]);
433 * Process the content
435 * @param array $activity Activity array
437 * @return array|bool Returns the item array or false if there was an unexpected occurrence
440 private static function processContent($activity, $item)
442 if (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/markdown')) {
443 $item['title'] = Markdown::toBBCode($activity['name']);
444 $content = Markdown::toBBCode($activity['content']);
445 } elseif (!empty($activity['mediatype']) && ($activity['mediatype'] == 'text/bbcode')) {
446 $item['title'] = $activity['name'];
447 $content = $activity['content'];
449 // By default assume "text/html"
450 $item['title'] = HTML::toBBCode($activity['name']);
451 $content = HTML::toBBCode($activity['content']);
454 if (!empty($activity['languages'])) {
455 $item['language'] = self::processLanguages($activity['languages']);
458 if (!empty($activity['emojis'])) {
459 $content = self::replaceEmojis($content, $activity['emojis']);
462 $content = self::addMentionLinks($content, $activity['tags']);
464 if (!empty($activity['source'])) {
465 $item['body'] = $activity['source'];
466 $item['raw-body'] = $content;
467 $item['body'] = Item::improveSharedDataInBody($item);
469 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
470 $item_private = !in_array(0, $activity['item_receiver']);
471 $parent = Post::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
472 if (!DBA::isResult($parent)) {
473 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
476 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
477 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
481 $content = self::removeImplicitMentionsFromBody($content, $parent);
483 $item['content-warning'] = HTML::toBBCode($activity['summary']);
484 $item['raw-body'] = $item['body'] = $content;
487 self::storeFromBody($item);
488 self::storeTags($item['uri-id'], $activity['tags']);
490 $item['location'] = $activity['location'];
492 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
493 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
496 $item['app'] = $activity['generator'];
502 * Store hashtags and mentions
506 private static function storeFromBody(array $item)
508 // Make sure to delete all existing tags (can happen when called via the update functionality)
509 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
511 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
515 * Generate a GUID out of an URL
517 * @param string $url message URL
518 * @return string with GUID
520 private static function getGUIDByURL(string $url)
522 $parsed = parse_url($url);
524 $host_hash = hash('crc32', $parsed['host']);
526 unset($parsed["scheme"]);
527 unset($parsed["host"]);
529 $path = implode("/", $parsed);
531 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
535 * Creates an item post
537 * @param array $activity Activity data
538 * @param array $item item array
539 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
540 * @throws \ImagickException
542 public static function postItem(array $activity, array $item)
549 ksort($activity['receiver']);
551 foreach ($activity['receiver'] as $receiver) {
552 if ($receiver == -1) {
556 $item['uid'] = $receiver;
558 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
560 case Receiver::TARGET_TO:
561 $item['post-reason'] = Item::PR_TO;
563 case Receiver::TARGET_CC:
564 $item['post-reason'] = Item::PR_CC;
566 case Receiver::TARGET_BTO:
567 $item['post-reason'] = Item::PR_BTO;
569 case Receiver::TARGET_BCC:
570 $item['post-reason'] = Item::PR_BCC;
572 case Receiver::TARGET_FOLLOWER:
573 $item['post-reason'] = Item::PR_FOLLOWER;
575 case Receiver::TARGET_ANSWER:
576 $item['post-reason'] = Item::PR_COMMENT;
578 case Receiver::TARGET_GLOBAL:
579 $item['post-reason'] = Item::PR_GLOBAL;
582 $item['post-reason'] = Item::PR_NONE;
585 if (!empty($activity['from-relay'])) {
586 $item['post-reason'] = Item::PR_RELAY;
587 } elseif (!empty($activity['thread-completion'])) {
588 $item['post-reason'] = Item::PR_FETCHED;
591 if ($item['isForum'] ?? false) {
592 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
594 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
597 if (($receiver != 0) && empty($item['contact-id'])) {
598 $item['contact-id'] = Contact::getIdForURL($activity['author']);
601 if (!empty($activity['directmessage'])) {
602 self::postMail($activity, $item);
606 if (!($item['isForum'] ?? false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT) &&
607 ($item['post-reason'] == Item::PR_BCC) && !Contact::isSharingByURL($activity['author'], $receiver)) {
608 Logger::info('Top level post via BCC from a non sharer, ignoring', ['uid' => $receiver, 'contact' => $item['contact-id']]);
612 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
613 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
615 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
616 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
620 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
624 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
627 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
628 $event_id = self::createEvent($activity, $item);
630 $item = Event::getItemArrayForImportedId($event_id, $item);
633 $item_id = Item::insert($item);
635 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
637 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
640 if ($item['uid'] == 0) {
645 // Store send a follow request for every reshare - but only when the item had been stored
646 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
647 $author = APContact::getByURL($item['owner-link'], false);
648 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
649 if ($author['type'] != 'Group') {
650 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
651 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
657 * Store tags and mentions into the tag table
659 * @param integer $uriid
662 private static function storeTags(int $uriid, array $tags = null)
664 foreach ($tags as $tag) {
665 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
669 $hash = substr($tag['name'], 0, 1);
671 if ($tag['type'] == 'Mention') {
672 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
673 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
674 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
675 $tag['name'] = substr($tag['name'], 1);
677 $type = Tag::IMPLICIT_MENTION;
679 if (!empty($tag['href'])) {
680 $apcontact = APContact::getByURL($tag['href']);
681 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
682 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
685 } elseif ($tag['type'] == 'Hashtag') {
686 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
687 $tag['name'] = substr($tag['name'], 1);
689 $type = Tag::HASHTAG;
692 if (empty($tag['name'])) {
696 Tag::store($uriid, $type, $tag['name'], $tag['href']);
701 * Creates an mail post
703 * @param array $activity Activity data
704 * @param array $item item array
705 * @return int|bool New mail table row id or false on error
706 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
708 private static function postMail($activity, $item)
710 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
711 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
715 Logger::info('Direct Message', $item);
718 $msg['uid'] = $item['uid'];
720 $msg['contact-id'] = $item['contact-id'];
722 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
723 $msg['from-name'] = $contact['name'];
724 $msg['from-url'] = $contact['url'];
725 $msg['from-photo'] = $contact['photo'];
727 $msg['uri'] = $item['uri'];
728 $msg['created'] = $item['created'];
730 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
731 if (DBA::isResult($parent)) {
732 $msg['parent-uri'] = $parent['parent-uri'];
733 $msg['title'] = $parent['title'];
735 $msg['parent-uri'] = $item['thr-parent'];
737 if (!empty($item['title'])) {
738 $msg['title'] = $item['title'];
739 } elseif (!empty($item['content-warning'])) {
740 $msg['title'] = $item['content-warning'];
742 // Trying to generate a title out of the body
743 $title = $item['body'];
745 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
746 $title = $matches[3];
749 $title = trim(BBCode::toPlaintext($title));
751 if (strlen($title) > 20) {
752 $title = substr($title, 0, 20) . '...';
755 $msg['title'] = $title;
758 $msg['body'] = $item['body'];
760 return Mail::insert($msg);
764 * Fetches missing posts
766 * @param string $url message URL
767 * @param array $child activity array with the child of this message
768 * @param string $relay_actor Relay actor
769 * @return string fetched message URL
770 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
772 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
774 if (!empty($child['receiver'])) {
775 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
780 $object = ActivityPub::fetchContent($url, $uid);
781 if (empty($object)) {
782 Logger::notice('Activity was not fetchable, aborting.', ['url' => $url]);
786 if (empty($object['id'])) {
787 Logger::notice('Activity has got not id, aborting. ', ['url' => $url, 'object' => $object]);
791 if (!empty($object['actor'])) {
792 $object_actor = $object['actor'];
793 } elseif (!empty($object['attributedTo'])) {
794 $object_actor = $object['attributedTo'];
795 if (is_array($object_actor)) {
796 $compacted = JsonLD::compact($object);
797 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
804 $signer = [$object_actor];
806 if (!empty($child['author'])) {
807 $actor = $child['author'];
810 $actor = $object_actor;
813 if (!empty($object['published'])) {
814 $published = $object['published'];
815 } elseif (!empty($child['published'])) {
816 $published = $child['published'];
818 $published = DateTimeFormat::utcNow();
822 $activity['@context'] = $object['@context'] ?? ActivityPub::CONTEXT;
823 unset($object['@context']);
824 $activity['id'] = $object['id'];
825 $activity['to'] = $object['to'] ?? [];
826 $activity['cc'] = $object['cc'] ?? [];
827 $activity['actor'] = $actor;
828 $activity['object'] = $object;
829 $activity['published'] = $published;
830 $activity['type'] = 'Create';
832 $ldactivity = JsonLD::compact($activity);
834 if (!empty($relay_actor)) {
835 $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
836 } elseif (!empty($child['thread-completion'])) {
837 $ldactivity['thread-completion'] = $child['thread-completion'];
839 $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
842 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
846 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
848 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
850 return $activity['id'];
854 * Test if incoming relay messages should be accepted
856 * @param array $activity activity array
857 * @param string $id object ID
858 * @return boolean true if message is accepted
860 private static function acceptIncomingMessage(array $activity, string $id)
862 if (empty($activity['as:object'])) {
863 Logger::info('No object field in activity - accepted', ['id' => $id]);
867 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
868 $uriid = ItemURI::getIdByURI($replyto);
869 if (Post::exists(['uri-id' => $uriid])) {
870 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'uri-id' => $uriid, 'replyto' => $replyto]);
874 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
875 $authorid = Contact::getIdForURL($attributed_to);
877 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
880 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
882 foreach ($tags as $tag) {
883 if ($tag['type'] != 'Hashtag') {
886 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
890 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
894 * perform a "follow" request
896 * @param array $activity
897 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
898 * @throws \ImagickException
900 public static function followUser($activity)
902 $uid = User::getIdForURL($activity['object_id']);
907 $owner = User::getOwnerDataById($uid);
912 $cid = Contact::getIdForURL($activity['actor'], $uid);
914 self::switchContact($cid);
915 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
918 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
919 'author-link' => $activity['actor']];
921 // Ensure that the contact has got the right network type
922 self::switchContact($item['author-id']);
924 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
925 if ($result === true) {
926 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
929 $cid = Contact::getIdForURL($activity['actor'], $uid);
934 if (empty($contact)) {
935 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
938 Logger::notice('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
942 * Update the given profile
944 * @param array $activity
947 public static function updatePerson($activity)
949 if (empty($activity['object_id'])) {
953 Logger::info('Updating profile', ['object' => $activity['object_id']]);
954 Contact::updateFromProbeByURL($activity['object_id']);
958 * Delete the given profile
960 * @param array $activity
961 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
963 public static function deletePerson($activity)
965 if (empty($activity['object_id']) || empty($activity['actor'])) {
966 Logger::info('Empty object id or actor.');
970 if ($activity['object_id'] != $activity['actor']) {
971 Logger::info('Object id does not match actor.');
975 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
976 while ($contact = DBA::fetch($contacts)) {
977 Contact::remove($contact['id']);
979 DBA::close($contacts);
981 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
985 * Accept a follow request
987 * @param array $activity
988 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
989 * @throws \ImagickException
991 public static function acceptFollowUser($activity)
993 $uid = User::getIdForURL($activity['object_actor']);
998 $cid = Contact::getIdForURL($activity['actor'], $uid);
1000 Logger::info('No contact found', ['actor' => $activity['actor']]);
1004 self::switchContact($cid);
1006 $fields = ['pending' => false];
1008 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1009 if ($contact['rel'] == Contact::FOLLOWER) {
1010 $fields['rel'] = Contact::FRIEND;
1013 $condition = ['id' => $cid];
1014 DBA::update('contact', $fields, $condition);
1015 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1019 * Reject a follow request
1021 * @param array $activity
1022 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1023 * @throws \ImagickException
1025 public static function rejectFollowUser($activity)
1027 $uid = User::getIdForURL($activity['object_actor']);
1032 $cid = Contact::getIdForURL($activity['actor'], $uid);
1034 Logger::info('No contact found', ['actor' => $activity['actor']]);
1038 self::switchContact($cid);
1040 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1041 Contact::remove($cid);
1042 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1044 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1049 * Undo activity like "like" or "dislike"
1051 * @param array $activity
1052 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1053 * @throws \ImagickException
1055 public static function undoActivity($activity)
1057 if (empty($activity['object_id'])) {
1061 if (empty($activity['object_actor'])) {
1065 $author_id = Contact::getIdForURL($activity['object_actor']);
1066 if (empty($author_id)) {
1070 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1074 * Activity to remove a follower
1076 * @param array $activity
1077 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1078 * @throws \ImagickException
1080 public static function undoFollowUser($activity)
1082 $uid = User::getIdForURL($activity['object_object']);
1087 $owner = User::getOwnerDataById($uid);
1088 if (empty($owner)) {
1092 $cid = Contact::getIdForURL($activity['actor'], $uid);
1094 Logger::info('No contact found', ['actor' => $activity['actor']]);
1098 self::switchContact($cid);
1100 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1101 if (!DBA::isResult($contact)) {
1105 Contact::removeFollower($owner, $contact);
1106 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1110 * Switches a contact to AP if needed
1112 * @param integer $cid Contact ID
1113 * @throws \Exception
1115 private static function switchContact($cid)
1117 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1118 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1122 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1123 Contact::updateFromProbe($cid);
1127 * Collects implicit mentions like:
1128 * - the author of the parent item
1129 * - all the mentioned conversants in the parent item
1131 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1133 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1135 private static function getImplicitMentionList(array $parent)
1137 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1139 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1141 $implicit_mentions = [];
1142 if (empty($parent_author['url'])) {
1143 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'parent-id' => $parent['id']]);
1145 $implicit_mentions[] = $parent_author['url'];
1146 $implicit_mentions[] = $parent_author['nurl'];
1147 $implicit_mentions[] = $parent_author['alias'];
1150 if (!empty($parent['alias'])) {
1151 $implicit_mentions[] = $parent['alias'];
1154 foreach ($parent_terms as $term) {
1155 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1156 if (!empty($contact['url'])) {
1157 $implicit_mentions[] = $contact['url'];
1158 $implicit_mentions[] = $contact['nurl'];
1159 $implicit_mentions[] = $contact['alias'];
1163 return $implicit_mentions;
1167 * Strips from the body prepended implicit mentions
1169 * @param string $body
1170 * @param array $parent
1173 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1175 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1179 $potential_mentions = self::getImplicitMentionList($parent);
1181 $kept_mentions = [];
1183 // Extract one prepended mention at a time from the body
1184 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1185 if (!in_array($matches[2], $potential_mentions)) {
1186 $kept_mentions[] = $matches[1];
1189 $body = $matches[3];
1192 // Re-appending the kept mentions to the body after extraction
1193 $kept_mentions[] = $body;
1195 return implode('', $kept_mentions);
1199 * Adds links to string mentions
1201 * @param string $body
1202 * @param array $tags
1205 protected static function addMentionLinks(string $body, array $tags): string
1207 // This prevents links to be added again to Pleroma-style mention links
1208 $body = self::normalizeMentionLinks($body);
1210 $body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
1211 foreach ($tags as $tag) {
1212 if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
1216 $hash = substr($tag['name'], 0, 1);
1217 $name = substr($tag['name'], 1);
1218 if (!in_array($hash, Tag::TAG_CHARACTER)) {
1220 $name = $tag['name'];
1223 $body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);