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 $emojis)
80 array_column($emojis, 'name'),
81 array_map(function ($emoji) {
82 return '[class=emoji mastodon][img=' . $emoji['href'] . ']' . $emoji['name'] . '[/img][/class]';
91 * Store attached media files in the post-media table
94 * @param array $attachment
97 private static function storeAttachmentAsMedia(int $uriid, array $attachment)
99 if (empty($attachment['url'])) {
103 $data = ['uri-id' => $uriid];
105 $filetype = strtolower(substr($attachment['mediaType'], 0, strpos($attachment['mediaType'], '/')));
106 if ($filetype == 'image') {
107 $data['type'] = Post\Media::IMAGE;
108 } elseif ($filetype == 'video') {
109 $data['type'] = Post\Media::VIDEO;
110 } elseif ($filetype == 'audio') {
111 $data['type'] = Post\Media::AUDIO;
112 } elseif (in_array($attachment['mediaType'], ['application/x-bittorrent', 'application/x-bittorrent;x-scheme-handler/magnet'])) {
113 $data['type'] = Post\Media::TORRENT;
115 Logger::info('Unknown type', ['attachment' => $attachment]);
119 $data['url'] = $attachment['url'];
120 $data['mimetype'] = $attachment['mediaType'];
121 $data['height'] = $attachment['height'] ?? null;
122 $data['size'] = $attachment['size'] ?? null;
123 $data['preview'] = $attachment['image'] ?? null;
124 $data['description'] = $attachment['name'] ?? null;
126 Post\Media::insert($data);
130 * Add attachment data to the item array
132 * @param array $activity
135 * @return array array
137 private static function constructAttachList($activity, $item)
139 if (empty($activity['attachments'])) {
143 foreach ($activity['attachments'] as $attach) {
144 switch ($attach['type']) {
147 'url' => $attach['url'],
148 'type' => $attach['type'],
149 'title' => $attach['title'] ?? '',
150 'text' => $attach['desc'] ?? '',
151 'image' => $attach['image'] ?? '',
155 $item['body'] = PageInfo::appendDataToBody($item['body'], $data);
158 self::storeAttachmentAsMedia($item['uri-id'], $attach);
160 $filetype = strtolower(substr($attach['mediaType'], 0, strpos($attach['mediaType'], '/')));
161 if ($filetype == 'image') {
162 if (!empty($activity['source'])) {
163 foreach ([0, 1, 2] as $size) {
164 if (preg_match('#/photo/.*-' . $size . '\.#ism', $attach['url']) &&
165 strpos(preg_replace('#(/photo/.*)-[012]\.#ism', '$1-' . $size . '.', $activity['source']), $attach['url'])) {
169 if (strpos($activity['source'], $attach['url'])) {
174 $item['body'] .= "\n";
176 // image is the preview/thumbnail URL
177 if (!empty($attach['image'])) {
178 $item['body'] .= '[url=' . $attach['url'] . ']';
179 $attach['url'] = $attach['image'];
182 if (empty($attach['name'])) {
183 $item['body'] .= '[img]' . $attach['url'] . '[/img]';
185 $item['body'] .= '[img=' . $attach['url'] . ']' . $attach['name'] . '[/img]';
188 if (!empty($attach['image'])) {
189 $item['body'] .= '[/url]';
191 } elseif ($filetype == 'audio') {
192 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
196 $item['body'] .= "\n[audio]" . $attach['url'] . '[/audio]';
197 } elseif ($filetype == 'video') {
198 if (!empty($activity['source']) && strpos($activity['source'], $attach['url'])) {
202 $item['body'] .= "\n[video]" . $attach['url'] . '[/video]';
213 * @param array $activity Activity array
214 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
216 public static function updateItem($activity)
218 $item = Item::selectFirst(['uri', 'uri-id', 'thr-parent', 'gravity'], ['uri' => $activity['id']]);
219 if (!DBA::isResult($item)) {
220 Logger::warning('No existing item, item will be created', ['uri' => $activity['id']]);
221 $item = self::createItem($activity);
222 self::postItem($activity, $item);
226 $item['changed'] = DateTimeFormat::utcNow();
227 $item['edited'] = DateTimeFormat::utc($activity['updated']);
229 $item = self::processContent($activity, $item);
231 $item = self::constructAttachList($activity, $item);
237 Item::update($item, ['uri' => $activity['id']]);
241 * Prepares data for a message
243 * @param array $activity Activity array
244 * @return array Internal item
245 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
246 * @throws \ImagickException
248 public static function createItem($activity)
251 $item['verb'] = Activity::POST;
252 $item['thr-parent'] = $activity['reply-to-id'];
254 if ($activity['reply-to-id'] == $activity['id']) {
255 $item['gravity'] = GRAVITY_PARENT;
256 $item['object-type'] = Activity\ObjectType::NOTE;
258 $item['gravity'] = GRAVITY_COMMENT;
259 $item['object-type'] = Activity\ObjectType::COMMENT;
262 if (empty($activity['directmessage']) && ($activity['id'] != $activity['reply-to-id']) && !Item::exists(['uri' => $activity['reply-to-id']])) {
263 Logger::notice('Parent not found. Try to refetch it.', ['parent' => $activity['reply-to-id']]);
264 self::fetchMissingActivity($activity['reply-to-id'], $activity);
267 $item['diaspora_signed_text'] = $activity['diaspora:comment'] ?? '';
269 /// @todo What to do with $activity['context']?
270 if (empty($activity['directmessage']) && ($item['gravity'] != GRAVITY_PARENT) && !Item::exists(['uri' => $item['thr-parent']])) {
271 Logger::info('Parent not found, message will be discarded.', ['thr-parent' => $item['thr-parent']]);
275 $item['network'] = Protocol::ACTIVITYPUB;
276 $item['author-link'] = $activity['author'];
277 $item['author-id'] = Contact::getIdForURL($activity['author']);
278 $item['owner-link'] = $activity['actor'];
279 $item['owner-id'] = Contact::getIdForURL($activity['actor']);
281 if (in_array(0, $activity['receiver']) && !empty($activity['unlisted'])) {
282 $item['private'] = Item::UNLISTED;
283 } elseif (in_array(0, $activity['receiver'])) {
284 $item['private'] = Item::PUBLIC;
286 $item['private'] = Item::PRIVATE;
289 if (!empty($activity['raw'])) {
290 $item['source'] = $activity['raw'];
291 $item['protocol'] = Conversation::PARCEL_ACTIVITYPUB;
292 $item['conversation-href'] = $activity['context'] ?? '';
293 $item['conversation-uri'] = $activity['conversation'] ?? '';
295 if (isset($activity['push'])) {
296 $item['direction'] = $activity['push'] ? Conversation::PUSH : Conversation::PULL;
300 $item['isForum'] = false;
302 if (!empty($activity['thread-completion'])) {
303 if ($activity['thread-completion'] != $item['owner-id']) {
304 $actor = Contact::getById($activity['thread-completion'], ['url']);
305 $item['causer-link'] = $actor['url'];
306 $item['causer-id'] = $activity['thread-completion'];
307 Logger::info('Use inherited actor as causer.', ['id' => $item['owner-id'], 'activity' => $activity['thread-completion'], 'owner' => $item['owner-link'], 'actor' => $actor['url']]);
309 // Store the original actor in the "causer" fields to enable the check for ignored or blocked contacts
310 $item['causer-link'] = $item['owner-link'];
311 $item['causer-id'] = $item['owner-id'];
312 Logger::info('Use actor as causer.', ['id' => $item['owner-id'], 'actor' => $item['owner-link']]);
315 $item['owner-link'] = $item['author-link'];
316 $item['owner-id'] = $item['author-id'];
318 $actor = APContact::getByURL($item['owner-link'], false);
319 $item['isForum'] = ($actor['type'] == 'Group');
322 $item['uri'] = $activity['id'];
324 $item['created'] = DateTimeFormat::utc($activity['published']);
325 $item['edited'] = DateTimeFormat::utc($activity['updated']);
326 $guid = $activity['sc:identifier'] ?: self::getGUIDByURL($item['uri']);
327 $item['guid'] = $activity['diaspora:guid'] ?: $guid;
329 $item['uri-id'] = ItemURI::insert(['uri' => $item['uri'], 'guid' => $item['guid']]);
330 if (empty($item['uri-id'])) {
331 Logger::warning('Unable to get a uri-id for an item uri', ['uri' => $item['uri'], 'guid' => $item['guid']]);
335 $item = self::processContent($activity, $item);
337 Logger::info('Message was not processed');
341 $item['plink'] = $activity['alternate-url'] ?? $item['uri'];
343 $item = self::constructAttachList($activity, $item);
351 * @param array $activity
352 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
353 * @throws \ImagickException
355 public static function deleteItem($activity)
357 $owner = Contact::getIdForURL($activity['actor']);
359 Logger::info('Deleting item', ['object' => $activity['object_id'], 'owner' => $owner]);
360 Item::markForDeletion(['uri' => $activity['object_id'], 'owner-id' => $owner]);
364 * Prepare the item array for an activity
366 * @param array $activity Activity array
367 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
368 * @throws \ImagickException
370 public static function addTag($activity)
372 if (empty($activity['object_content']) || empty($activity['object_id'])) {
376 foreach ($activity['receiver'] as $receiver) {
377 $item = Item::selectFirst(['id', 'uri-id', 'tag', 'origin', 'author-link'], ['uri' => $activity['target_id'], 'uid' => $receiver]);
378 if (!DBA::isResult($item)) {
379 // We don't fetch missing content for this purpose
383 if (($item['author-link'] != $activity['actor']) && !$item['origin']) {
384 Logger::info('Not origin, not from the author, skipping update', ['id' => $item['id'], 'author' => $item['author-link'], 'actor' => $activity['actor']]);
388 Tag::store($item['uri-id'], Tag::HASHTAG, $activity['object_content'], $activity['object_id']);
389 Logger::info('Tagged item', ['id' => $item['id'], 'tag' => $activity['object_content'], 'uri' => $activity['target_id'], 'actor' => $activity['actor']]);
394 * Prepare the item array for an activity
396 * @param array $activity Activity array
397 * @param string $verb Activity verb
398 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
399 * @throws \ImagickException
401 public static function createActivity($activity, $verb)
403 $item = self::createItem($activity);
404 $item['verb'] = $verb;
405 $item['thr-parent'] = $activity['object_id'];
406 $item['gravity'] = GRAVITY_ACTIVITY;
407 $item['object-type'] = Activity\ObjectType::NOTE;
409 $item['diaspora_signed_text'] = $activity['diaspora:like'] ?? '';
411 self::postItem($activity, $item);
417 * @param array $activity Activity array
421 public static function createEvent($activity, $item)
423 $event['summary'] = HTML::toBBCode($activity['name']);
424 $event['desc'] = HTML::toBBCode($activity['content']);
425 $event['start'] = $activity['start-time'];
426 $event['finish'] = $activity['end-time'];
427 $event['nofinish'] = empty($event['finish']);
428 $event['location'] = $activity['location'];
429 $event['adjust'] = true;
430 $event['cid'] = $item['contact-id'];
431 $event['uid'] = $item['uid'];
432 $event['uri'] = $item['uri'];
433 $event['edited'] = $item['edited'];
434 $event['private'] = $item['private'];
435 $event['guid'] = $item['guid'];
436 $event['plink'] = $item['plink'];
438 $condition = ['uri' => $item['uri'], 'uid' => $item['uid']];
439 $ev = DBA::selectFirst('event', ['id'], $condition);
440 if (DBA::isResult($ev)) {
441 $event['id'] = $ev['id'];
444 $event_id = Event::store($event);
445 Logger::info('Event was stored', ['id' => $event_id]);
449 * Process the content
451 * @param array $activity Activity array
453 * @return array|bool Returns the item array or false if there was an unexpected occurrence
456 private static function processContent($activity, $item)
458 $item['title'] = HTML::toBBCode($activity['name']);
460 $content = HTML::toBBCode($activity['content']);
462 if (!empty($activity['emojis'])) {
463 $content = self::replaceEmojis($content, $activity['emojis']);
466 $content = self::convertMentions($content);
468 if (!empty($activity['source'])) {
469 $item['body'] = $activity['source'];
470 $item['raw-body'] = $content;
472 if (empty($activity['directmessage']) && ($item['thr-parent'] != $item['uri']) && ($item['gravity'] == GRAVITY_COMMENT)) {
473 $item_private = !in_array(0, $activity['item_receiver']);
474 $parent = Item::selectFirst(['id', 'uri-id', 'private', 'author-link', 'alias'], ['uri' => $item['thr-parent']]);
475 if (!DBA::isResult($parent)) {
476 Logger::warning('Unknown parent item.', ['uri' => $item['thr-parent']]);
479 if ($item_private && ($parent['private'] != Item::PRIVATE)) {
480 Logger::warning('Item is private but the parent is not. Dropping.', ['item-uri' => $item['uri'], 'thr-parent' => $item['thr-parent']]);
484 $content = self::removeImplicitMentionsFromBody($content, $parent);
486 $item['content-warning'] = HTML::toBBCode($activity['summary']);
487 $item['raw-body'] = $item['body'] = $content;
490 self::storeFromBody($item);
491 self::storeTags($item['uri-id'], $activity['tags']);
493 $item['location'] = $activity['location'];
495 if (!empty($activity['latitude']) && !empty($activity['longitude'])) {
496 $item['coord'] = $activity['latitude'] . ' ' . $activity['longitude'];
499 $item['app'] = $activity['generator'];
505 * Store hashtags and mentions
509 private static function storeFromBody(array $item)
511 // Make sure to delete all existing tags (can happen when called via the update functionality)
512 DBA::delete('post-tag', ['uri-id' => $item['uri-id']]);
514 Tag::storeFromBody($item['uri-id'], $item['body'], '@!');
518 * Generate a GUID out of an URL
520 * @param string $url message URL
521 * @return string with GUID
523 private static function getGUIDByURL(string $url)
525 $parsed = parse_url($url);
527 $host_hash = hash('crc32', $parsed['host']);
529 unset($parsed["scheme"]);
530 unset($parsed["host"]);
532 $path = implode("/", $parsed);
534 return $host_hash . '-'. hash('fnv164', $path) . '-'. hash('joaat', $path);
538 * Creates an item post
540 * @param array $activity Activity data
541 * @param array $item item array
542 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
543 * @throws \ImagickException
545 public static function postItem(array $activity, array $item)
552 ksort($activity['receiver']);
554 foreach ($activity['receiver'] as $receiver) {
555 if ($receiver == -1) {
559 $item['uid'] = $receiver;
561 $type = $activity['reception_type'][$receiver] ?? Receiver::TARGET_UNKNOWN;
563 case Receiver::TARGET_TO:
564 $item['post-type'] = Item::PT_TO;
566 case Receiver::TARGET_CC:
567 $item['post-type'] = Item::PT_CC;
569 case Receiver::TARGET_BTO:
570 $item['post-type'] = Item::PT_BTO;
572 case Receiver::TARGET_BCC:
573 $item['post-type'] = Item::PT_BCC;
575 case Receiver::TARGET_FOLLOWER:
576 $item['post-type'] = Item::PT_FOLLOWER;
578 case Receiver::TARGET_ANSWER:
579 $item['post-type'] = Item::PT_COMMENT;
581 case Receiver::TARGET_GLOBAL:
582 $item['post-type'] = Item::PT_GLOBAL;
585 $item['post-type'] = Item::PT_ARTICLE;
588 if (!empty($activity['from-relay'])) {
589 $item['post-type'] = Item::PT_RELAY;
590 } elseif (!empty($activity['thread-completion'])) {
591 $item['post-type'] = Item::PT_FETCHED;
594 if ($item['isForum'] ?? false) {
595 $item['contact-id'] = Contact::getIdForURL($activity['actor'], $receiver);
597 $item['contact-id'] = Contact::getIdForURL($activity['author'], $receiver);
600 if (($receiver != 0) && empty($item['contact-id'])) {
601 $item['contact-id'] = Contact::getIdForURL($activity['author']);
604 if (!empty($activity['directmessage'])) {
605 self::postMail($activity, $item);
609 if (DI::pConfig()->get($receiver, 'system', 'accept_only_sharer', false) && ($receiver != 0) && ($item['gravity'] == GRAVITY_PARENT)) {
610 $skip = !Contact::isSharingByURL($activity['author'], $receiver);
612 if ($skip && (($activity['type'] == 'as:Announce') || ($item['isForum'] ?? false))) {
613 $skip = !Contact::isSharingByURL($activity['actor'], $receiver);
617 Logger::info('Skipping post', ['uid' => $receiver, 'url' => $item['uri']]);
621 Logger::info('Accepting post', ['uid' => $receiver, 'url' => $item['uri']]);
624 if (($item['gravity'] != GRAVITY_ACTIVITY) && ($activity['object_type'] == 'as:Event')) {
625 self::createEvent($activity, $item);
628 $item_id = Item::insert($item);
630 Logger::info('Item insertion successful', ['user' => $item['uid'], 'item_id' => $item_id]);
632 Logger::notice('Item insertion aborted', ['user' => $item['uid']]);
635 if ($item['uid'] == 0) {
640 // Store send a follow request for every reshare - but only when the item had been stored
641 if ($stored && ($item['private'] != Item::PRIVATE) && ($item['gravity'] == GRAVITY_PARENT) && ($item['author-link'] != $item['owner-link'])) {
642 $author = APContact::getByURL($item['owner-link'], false);
643 // We send automatic follow requests for reshared messages. (We don't need though for forum posts)
644 if ($author['type'] != 'Group') {
645 Logger::info('Send follow request', ['uri' => $item['uri'], 'stored' => $stored, 'to' => $item['author-link']]);
646 ActivityPub\Transmitter::sendFollowObject($item['uri'], $item['author-link']);
652 * Store tags and mentions into the tag table
654 * @param integer $uriid
657 private static function storeTags(int $uriid, array $tags = null)
659 foreach ($tags as $tag) {
660 if (empty($tag['name']) || empty($tag['type']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
664 $hash = substr($tag['name'], 0, 1);
666 if ($tag['type'] == 'Mention') {
667 if (in_array($hash, [Tag::TAG_CHARACTER[Tag::MENTION],
668 Tag::TAG_CHARACTER[Tag::EXCLUSIVE_MENTION],
669 Tag::TAG_CHARACTER[Tag::IMPLICIT_MENTION]])) {
670 $tag['name'] = substr($tag['name'], 1);
672 $type = Tag::IMPLICIT_MENTION;
674 if (!empty($tag['href'])) {
675 $apcontact = APContact::getByURL($tag['href']);
676 if (!empty($apcontact['name']) || !empty($apcontact['nick'])) {
677 $tag['name'] = $apcontact['name'] ?: $apcontact['nick'];
680 } elseif ($tag['type'] == 'Hashtag') {
681 if ($hash == Tag::TAG_CHARACTER[Tag::HASHTAG]) {
682 $tag['name'] = substr($tag['name'], 1);
684 $type = Tag::HASHTAG;
687 if (empty($tag['name'])) {
691 Tag::store($uriid, $type, $tag['name'], $tag['href']);
696 * Creates an mail post
698 * @param array $activity Activity data
699 * @param array $item item array
700 * @return int|bool New mail table row id or false on error
701 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
703 private static function postMail($activity, $item)
705 if (($item['gravity'] != GRAVITY_PARENT) && !DBA::exists('mail', ['uri' => $item['thr-parent'], 'uid' => $item['uid']])) {
706 Logger::info('Parent not found, mail will be discarded.', ['uid' => $item['uid'], 'uri' => $item['thr-parent']]);
710 Logger::info('Direct Message', $item);
713 $msg['uid'] = $item['uid'];
715 $msg['contact-id'] = $item['contact-id'];
717 $contact = Contact::getById($item['contact-id'], ['name', 'url', 'photo']);
718 $msg['from-name'] = $contact['name'];
719 $msg['from-url'] = $contact['url'];
720 $msg['from-photo'] = $contact['photo'];
722 $msg['uri'] = $item['uri'];
723 $msg['created'] = $item['created'];
725 $parent = DBA::selectFirst('mail', ['parent-uri', 'title'], ['uri' => $item['thr-parent']]);
726 if (DBA::isResult($parent)) {
727 $msg['parent-uri'] = $parent['parent-uri'];
728 $msg['title'] = $parent['title'];
730 $msg['parent-uri'] = $item['thr-parent'];
732 if (!empty($item['title'])) {
733 $msg['title'] = $item['title'];
734 } elseif (!empty($item['content-warning'])) {
735 $msg['title'] = $item['content-warning'];
737 // Trying to generate a title out of the body
738 $title = $item['body'];
740 while (preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $title, $matches)) {
741 $title = $matches[3];
744 $title = trim(HTML::toPlaintext(BBCode::convert($title, false, BBCode::API, true), 0));
746 if (strlen($title) > 20) {
747 $title = substr($title, 0, 20) . '...';
750 $msg['title'] = $title;
753 $msg['body'] = $item['body'];
755 return Mail::insert($msg);
759 * Fetches missing posts
761 * @param string $url message URL
762 * @param array $child activity array with the child of this message
763 * @param string $relay_actor Relay actor
764 * @return string fetched message URL
765 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
767 public static function fetchMissingActivity(string $url, array $child = [], string $relay_actor = '')
769 if (!empty($child['receiver'])) {
770 $uid = ActivityPub\Receiver::getFirstUserFromReceivers($child['receiver']);
775 $object = ActivityPub::fetchContent($url, $uid);
776 if (empty($object)) {
777 Logger::log('Activity ' . $url . ' was not fetchable, aborting.');
781 if (empty($object['id'])) {
782 Logger::log('Activity ' . $url . ' has got not id, aborting. ' . json_encode($object));
786 if (!empty($object['actor'])) {
787 $object_actor = $object['actor'];
788 } elseif (!empty($object['attributedTo'])) {
789 $object_actor = $object['attributedTo'];
790 if (is_array($object_actor)) {
791 $compacted = JsonLD::compact($object);
792 $object_actor = JsonLD::fetchElement($compacted, 'as:attributedTo', '@id');
799 $signer = [$object_actor];
801 if (!empty($child['author'])) {
802 $actor = $child['author'];
805 $actor = $object_actor;
808 if (!empty($object['published'])) {
809 $published = $object['published'];
810 } elseif (!empty($child['published'])) {
811 $published = $child['published'];
813 $published = DateTimeFormat::utcNow();
817 $activity['@context'] = $object['@context'];
818 unset($object['@context']);
819 $activity['id'] = $object['id'];
820 $activity['to'] = $object['to'] ?? [];
821 $activity['cc'] = $object['cc'] ?? [];
822 $activity['actor'] = $actor;
823 $activity['object'] = $object;
824 $activity['published'] = $published;
825 $activity['type'] = 'Create';
827 $ldactivity = JsonLD::compact($activity);
829 if (!empty($relay_actor)) {
830 $ldactivity['thread-completion'] = $ldactivity['from-relay'] = Contact::getIdForURL($relay_actor);
831 } elseif (!empty($child['thread-completion'])) {
832 $ldactivity['thread-completion'] = $child['thread-completion'];
834 $ldactivity['thread-completion'] = Contact::getIdForURL($actor);
837 if (!empty($relay_actor) && !self::acceptIncomingMessage($ldactivity, $object['id'])) {
841 ActivityPub\Receiver::processActivity($ldactivity, json_encode($activity), $uid, true, false, $signer);
843 Logger::notice('Activity had been fetched and processed.', ['url' => $url, 'object' => $activity['id']]);
845 return $activity['id'];
849 * Test if incoming relay messages should be accepted
851 * @param array $activity activity array
852 * @param string $id object ID
853 * @return boolean true if message is accepted
855 private static function acceptIncomingMessage(array $activity, string $id)
857 if (empty($activity['as:object'])) {
858 Logger::info('No object field in activity - accepted', ['id' => $id]);
862 $replyto = JsonLD::fetchElement($activity['as:object'], 'as:inReplyTo', '@id');
863 if (Item::exists(['uri' => $replyto])) {
864 Logger::info('Post is a reply to an existing post - accepted', ['id' => $id, 'replyto' => $replyto]);
868 $attributed_to = JsonLD::fetchElement($activity['as:object'], 'as:attributedTo', '@id');
869 $authorid = Contact::getIdForURL($attributed_to);
871 $body = HTML::toBBCode(JsonLD::fetchElement($activity['as:object'], 'as:content', '@value'));
874 $tags = Receiver::processTags(JsonLD::fetchElementArray($activity['as:object'], 'as:tag') ?? []);
876 foreach ($tags as $tag) {
877 if ($tag['type'] != 'Hashtag') {
880 $messageTags[] = ltrim(mb_strtolower($tag['name']), '#');
884 return Relay::isSolicitedPost($messageTags, $body, $authorid, $id, Protocol::ACTIVITYPUB);
888 * perform a "follow" request
890 * @param array $activity
891 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
892 * @throws \ImagickException
894 public static function followUser($activity)
896 $uid = User::getIdForURL($activity['object_id']);
901 $owner = User::getOwnerDataById($uid);
906 $cid = Contact::getIdForURL($activity['actor'], $uid);
908 self::switchContact($cid);
909 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
912 $item = ['author-id' => Contact::getIdForURL($activity['actor']),
913 'author-link' => $activity['actor']];
915 // Ensure that the contact has got the right network type
916 self::switchContact($item['author-id']);
918 $result = Contact::addRelationship($owner, [], $item, false, $activity['content'] ?? '');
919 if ($result === true) {
920 ActivityPub\Transmitter::sendContactAccept($item['author-link'], $activity['id'], $owner['uid']);
923 $cid = Contact::getIdForURL($activity['actor'], $uid);
928 if (empty($contact)) {
929 DBA::update('contact', ['hub-verify' => $activity['id'], 'protocol' => Protocol::ACTIVITYPUB], ['id' => $cid]);
932 Logger::log('Follow user ' . $uid . ' from contact ' . $cid . ' with id ' . $activity['id']);
936 * Update the given profile
938 * @param array $activity
941 public static function updatePerson($activity)
943 if (empty($activity['object_id'])) {
947 Logger::info('Updating profile', ['object' => $activity['object_id']]);
948 Contact::updateFromProbeByURL($activity['object_id']);
952 * Delete the given profile
954 * @param array $activity
955 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
957 public static function deletePerson($activity)
959 if (empty($activity['object_id']) || empty($activity['actor'])) {
960 Logger::info('Empty object id or actor.');
964 if ($activity['object_id'] != $activity['actor']) {
965 Logger::info('Object id does not match actor.');
969 $contacts = DBA::select('contact', ['id'], ['nurl' => Strings::normaliseLink($activity['object_id'])]);
970 while ($contact = DBA::fetch($contacts)) {
971 Contact::remove($contact['id']);
973 DBA::close($contacts);
975 Logger::info('Deleted contact', ['object' => $activity['object_id']]);
979 * Accept a follow request
981 * @param array $activity
982 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
983 * @throws \ImagickException
985 public static function acceptFollowUser($activity)
987 $uid = User::getIdForURL($activity['object_actor']);
992 $cid = Contact::getIdForURL($activity['actor'], $uid);
994 Logger::info('No contact found', ['actor' => $activity['actor']]);
998 self::switchContact($cid);
1000 $fields = ['pending' => false];
1002 $contact = DBA::selectFirst('contact', ['rel'], ['id' => $cid]);
1003 if ($contact['rel'] == Contact::FOLLOWER) {
1004 $fields['rel'] = Contact::FRIEND;
1007 $condition = ['id' => $cid];
1008 DBA::update('contact', $fields, $condition);
1009 Logger::info('Accept contact request', ['contact' => $cid, 'user' => $uid]);
1013 * Reject a follow request
1015 * @param array $activity
1016 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1017 * @throws \ImagickException
1019 public static function rejectFollowUser($activity)
1021 $uid = User::getIdForURL($activity['object_actor']);
1026 $cid = Contact::getIdForURL($activity['actor'], $uid);
1028 Logger::info('No contact found', ['actor' => $activity['actor']]);
1032 self::switchContact($cid);
1034 if (DBA::exists('contact', ['id' => $cid, 'rel' => Contact::SHARING])) {
1035 Contact::remove($cid);
1036 Logger::info('Rejected contact request - contact removed', ['contact' => $cid, 'user' => $uid]);
1038 Logger::info('Rejected contact request', ['contact' => $cid, 'user' => $uid]);
1043 * Undo activity like "like" or "dislike"
1045 * @param array $activity
1046 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1047 * @throws \ImagickException
1049 public static function undoActivity($activity)
1051 if (empty($activity['object_id'])) {
1055 if (empty($activity['object_actor'])) {
1059 $author_id = Contact::getIdForURL($activity['object_actor']);
1060 if (empty($author_id)) {
1064 Item::markForDeletion(['uri' => $activity['object_id'], 'author-id' => $author_id, 'gravity' => GRAVITY_ACTIVITY]);
1068 * Activity to remove a follower
1070 * @param array $activity
1071 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1072 * @throws \ImagickException
1074 public static function undoFollowUser($activity)
1076 $uid = User::getIdForURL($activity['object_object']);
1081 $owner = User::getOwnerDataById($uid);
1082 if (empty($owner)) {
1086 $cid = Contact::getIdForURL($activity['actor'], $uid);
1088 Logger::info('No contact found', ['actor' => $activity['actor']]);
1092 self::switchContact($cid);
1094 $contact = DBA::selectFirst('contact', [], ['id' => $cid]);
1095 if (!DBA::isResult($contact)) {
1099 Contact::removeFollower($owner, $contact);
1100 Logger::info('Undo following request', ['contact' => $cid, 'user' => $uid]);
1104 * Switches a contact to AP if needed
1106 * @param integer $cid Contact ID
1107 * @throws \Exception
1109 private static function switchContact($cid)
1111 $contact = DBA::selectFirst('contact', ['network', 'url'], ['id' => $cid]);
1112 if (!DBA::isResult($contact) || in_array($contact['network'], [Protocol::ACTIVITYPUB, Protocol::DFRN]) || Contact::isLocal($contact['url'])) {
1116 Logger::info('Change existing contact', ['cid' => $cid, 'previous' => $contact['network']]);
1117 Contact::updateFromProbe($cid);
1121 * Collects implicit mentions like:
1122 * - the author of the parent item
1123 * - all the mentioned conversants in the parent item
1125 * @param array $parent Item array with at least ['id', 'author-link', 'alias']
1127 * @throws \Friendica\Network\HTTPException\InternalServerErrorException
1129 private static function getImplicitMentionList(array $parent)
1131 $parent_terms = Tag::getByURIId($parent['uri-id'], [Tag::MENTION, Tag::IMPLICIT_MENTION, Tag::EXCLUSIVE_MENTION]);
1133 $parent_author = Contact::getByURL($parent['author-link'], false, ['url', 'nurl', 'alias']);
1135 $implicit_mentions = [];
1136 if (empty($parent_author['url'])) {
1137 Logger::notice('Author public contact unknown.', ['author-link' => $parent['author-link'], 'item-id' => $parent['id']]);
1139 $implicit_mentions[] = $parent_author['url'];
1140 $implicit_mentions[] = $parent_author['nurl'];
1141 $implicit_mentions[] = $parent_author['alias'];
1144 if (!empty($parent['alias'])) {
1145 $implicit_mentions[] = $parent['alias'];
1148 foreach ($parent_terms as $term) {
1149 $contact = Contact::getByURL($term['url'], false, ['url', 'nurl', 'alias']);
1150 if (!empty($contact['url'])) {
1151 $implicit_mentions[] = $contact['url'];
1152 $implicit_mentions[] = $contact['nurl'];
1153 $implicit_mentions[] = $contact['alias'];
1157 return $implicit_mentions;
1161 * Strips from the body prepended implicit mentions
1163 * @param string $body
1164 * @param array $parent
1167 private static function removeImplicitMentionsFromBody(string $body, array $parent)
1169 if (DI::config()->get('system', 'disable_implicit_mentions')) {
1173 $potential_mentions = self::getImplicitMentionList($parent);
1175 $kept_mentions = [];
1177 // Extract one prepended mention at a time from the body
1178 while(preg_match('#^(@\[url=([^\]]+)].*?\[\/url]\s)(.*)#is', $body, $matches)) {
1179 if (!in_array($matches[2], $potential_mentions)) {
1180 $kept_mentions[] = $matches[1];
1183 $body = $matches[3];
1186 // Re-appending the kept mentions to the body after extraction
1187 $kept_mentions[] = $body;
1189 return implode('', $kept_mentions);